Clone Corres2math platform

2025-11-04 11:12:18 +01:00 · 2020-12-27 11:49:54 +01:00
parent 3d9bd88a41
commit 03eca29316
151 changed files with 10032 additions and 0 deletions
--- a/apps/participation/init.py
+++ b/apps/participation/init.py
@@ -0,0 +1,4 @@
+# Copyright (C) 2020 by Animath
+# SPDX-License-Identifier: GPL-3.0-or-later
+
+default_app_config = 'participation.apps.ParticipationConfig'
--- a/apps/participation/admin.py
+++ b/apps/participation/admin.py
@@ -0,0 +1,49 @@
+# Copyright (C) 2020 by Animath
+# SPDX-License-Identifier: GPL-3.0-or-later
+
+from django.contrib import admin
+from django.utils.translation import gettext_lazy as _
+
+from .models import Participation, Phase, Question, Team, Video
+
+
+@admin.register(Team)
+class TeamAdmin(admin.ModelAdmin):
+    list_display = ('name', 'trigram', 'problem', 'valid',)
+    search_fields = ('name', 'trigram',)
+    list_filter = ('participation__problem', 'participation__valid',)
+
+    def problem(self, team):
+        return team.participation.get_problem_display()
+
+    problem.short_description = _('problem number')
+
+    def valid(self, team):
+        return team.participation.valid
+
+    valid.short_description = _('valid')
+
+
+@admin.register(Participation)
+class ParticipationAdmin(admin.ModelAdmin):
+    list_display = ('team', 'problem', 'valid',)
+    search_fields = ('team__name', 'team__trigram',)
+    list_filter = ('problem', 'valid',)
+
+
+@admin.register(Video)
+class VideoAdmin(admin.ModelAdmin):
+    list_display = ('participation', 'link',)
+    search_fields = ('participation__team__name', 'participation__team__trigram', 'link',)
+
+
+@admin.register(Question)
+class QuestionAdmin(admin.ModelAdmin):
+    list_display = ('participation', 'question',)
+    search_fields = ('participation__team__name', 'participation__team__trigram', 'question',)
+
+
+@admin.register(Phase)
+class PhaseAdmin(admin.ModelAdmin):
+    list_display = ('phase_number', 'start', 'end',)
+    ordering = ('phase_number', 'start',)
--- a/apps/participation/apps.py
+++ b/apps/participation/apps.py
@@ -0,0 +1,18 @@
+# Copyright (C) 2020 by Animath
+# SPDX-License-Identifier: GPL-3.0-or-later
+
+from django.apps import AppConfig
+from django.db.models.signals import post_save, pre_delete, pre_save
+
+
+class ParticipationConfig(AppConfig):
+    """
+    The participation app contains the data about the teams, videos, ...
+    """
+    name = 'participation'
+
+    def ready(self):
+        from participation.signals import create_team_participation, delete_related_videos, update_mailing_list
+        pre_save.connect(update_mailing_list, "participation.Team")
+        pre_delete.connect(delete_related_videos, "participation.Participation")
+        post_save.connect(create_team_participation, "participation.Team")
--- a/apps/participation/forms.py
+++ b/apps/participation/forms.py
@@ -0,0 +1,194 @@
+# Copyright (C) 2020 by Animath
+# SPDX-License-Identifier: GPL-3.0-or-later
+
+import re
+
+from bootstrap_datepicker_plus import DateTimePickerInput
+from django import forms
+from django.core.exceptions import ObjectDoesNotExist, ValidationError
+from django.db.models import Q
+from django.utils.translation import gettext_lazy as _
+
+from .models import Participation, Phase, Question, Team, Video
+
+
+class TeamForm(forms.ModelForm):
+    """
+    Form to create a team, with the name and the trigram,
+    and if the team accepts that Animath diffuse the videos.
+    """
+    def clean_trigram(self):
+        trigram = self.cleaned_data["trigram"].upper()
+        if not re.match("[A-Z]{3}", trigram):
+            raise ValidationError(_("The trigram must be composed of three uppercase letters."))
+        return trigram
+
+    class Meta:
+        model = Team
+        fields = ('name', 'trigram', 'grant_animath_access_videos',)
+
+
+class JoinTeamForm(forms.ModelForm):
+    """
+    Form to join a team by the access code.
+    """
+    def clean_access_code(self):
+        access_code = self.cleaned_data["access_code"]
+        if not Team.objects.filter(access_code=access_code).exists():
+            raise ValidationError(_("No team was found with this access code."))
+        return access_code
+
+    def clean(self):
+        cleaned_data = super().clean()
+        if "access_code" in cleaned_data:
+            team = Team.objects.get(access_code=cleaned_data["access_code"])
+            self.instance = team
+        return cleaned_data
+
+    class Meta:
+        model = Team
+        fields = ('access_code',)
+
+
+class ParticipationForm(forms.ModelForm):
+    """
+    Form to update the problem of a team participation.
+    """
+    class Meta:
+        model = Participation
+        fields = ('problem',)
+
+
+class RequestValidationForm(forms.Form):
+    """
+    Form to ask about validation.
+    """
+    _form_type = forms.CharField(
+        initial="RequestValidationForm",
+        widget=forms.HiddenInput(),
+    )
+
+    engagement = forms.BooleanField(
+        label=_("I engage myself to participate to the whole \"Correspondances\"."),
+        required=True,
+    )
+
+
+class ValidateParticipationForm(forms.Form):
+    """
+    Form to let administrators to accept or refuse a team.
+    """
+    _form_type = forms.CharField(
+        initial="ValidateParticipationForm",
+        widget=forms.HiddenInput(),
+    )
+
+    message = forms.CharField(
+        label=_("Message to address to the team:"),
+        widget=forms.Textarea(),
+    )
+
+
+class UploadVideoForm(forms.ModelForm):
+    """
+    Form to upload a video, for a solution or a synthesis.
+    """
+    class Meta:
+        model = Video
+        fields = ('link',)
+
+    def clean(self):
+        if Phase.current_phase().phase_number != 1 and Phase.current_phase().phase_number != 4 and self.instance.link:
+            self.add_error("link", _("You can't upload your video after the deadline."))
+        return super().clean()
+
+
+class ReceiveParticipationForm(forms.ModelForm):
+    """
+    Update the received participation of a participation.
+    """
+    def __init__(self, *args, **kwargs):
+        super().__init__(*args, **kwargs)
+        self.fields["received_participation"].queryset = Participation.objects.filter(
+            ~Q(pk=self.instance.pk) & Q(problem=self.instance.problem, valid=True)
+        )
+
+    class Meta:
+        model = Participation
+        fields = ('received_participation',)
+
+
+class SendParticipationForm(forms.ModelForm):
+    """
+    Update the sent participation of a participation.
+    """
+    sent_participation = forms.ModelChoiceField(
+        queryset=Participation.objects,
+        label=lambda: _("Send to team"),
+    )
+
+    def __init__(self, *args, **kwargs):
+        super().__init__(*args, **kwargs)
+        try:
+            self.fields["sent_participation"].initial = self.instance.sent_participation
+        except ObjectDoesNotExist:     # No sent participation
+            pass
+        self.fields["sent_participation"].queryset = Participation.objects.filter(
+            ~Q(pk=self.instance.pk) & Q(problem=self.instance.problem, valid=True)
+        )
+
+    def clean(self, commit=True):
+        cleaned_data = super().clean()
+        if "sent_participation" in cleaned_data:
+            participation = cleaned_data["sent_participation"]
+            participation.received_participation = self.instance
+            self.instance = participation
+        return cleaned_data
+
+    class Meta:
+        model = Participation
+        fields = ('sent_participation',)
+
+
+class QuestionForm(forms.ModelForm):
+    """
+    Create or update a question.
+    """
+    def __init__(self, *args, **kwargs):
+        super().__init__(*args, **kwargs)
+        self.fields["question"].widget.attrs.update({"placeholder": _("How did you get the idea to ...?")})
+
+    def clean(self):
+        if Phase.current_phase().phase_number != 2:
+            self.add_error(None, _("You can only create or update a question during the second phase."))
+        return super().clean()
+
+    class Meta:
+        model = Question
+        fields = ('question',)
+
+
+class PhaseForm(forms.ModelForm):
+    """
+    Form to update the calendar of a phase.
+    """
+    class Meta:
+        model = Phase
+        fields = ('start', 'end',)
+        widgets = {
+            'start': DateTimePickerInput(format='%d/%m/%Y %H:%M'),
+            'end': DateTimePickerInput(format='%d/%m/%Y %H:%M'),
+        }
+
+    def clean(self):
+        # Ensure that dates are in a right order
+        cleaned_data = super().clean()
+        start = cleaned_data["start"]
+        end = cleaned_data["end"]
+        if end <= start:
+            self.add_error("end", _("Start date must be before the end date."))
+        if Phase.objects.filter(phase_number__lt=self.instance.phase_number, end__gt=start).exists():
+            self.add_error("start", _("This phase must start after the previous phases."))
+        if Phase.objects.filter(phase_number__gt=self.instance.phase_number, start__lt=end).exists():
+            self.add_error("end", _("This phase must end after the next phases."))
+        return cleaned_data
--- a/apps/participation/management/commands/init.py
+++ b/apps/participation/management/commands/init.py
@@ -0,0 +1,2 @@
+# Copyright (C) 2020 by Animath
+# SPDX-License-Identifier: GPL-3.0-or-later
--- a/apps/participation/management/commands/fix_matrix_channels.py
+++ b/apps/participation/management/commands/fix_matrix_channels.py
@@ -0,0 +1,92 @@
+# Copyright (C) 2020 by Animath
+# SPDX-License-Identifier: GPL-3.0-or-later
+
+import os
+
+from asgiref.sync import async_to_sync
+from tfjm.matrix import Matrix, RoomPreset, RoomVisibility
+from django.core.management import BaseCommand
+from registration.models import AdminRegistration, Registration
+
+
+class Command(BaseCommand):
+    def handle(self, *args, **options):
+        Matrix.set_display_name("Bot du TFJM²")
+
+        if not os.getenv("SYNAPSE_PASSWORD"):
+            avatar_uri = "plop"
+        else:  # pragma: no cover
+            if not os.path.isfile(".matrix_avatar"):
+                stat_file = os.stat("tfjm/static/logo.svg")
+                with open("tfjm/static/logo.svg", "rb") as f:
+                    resp = Matrix.upload(f, filename="logo.svg", content_type="image/svg",
+                                         filesize=stat_file.st_size)[0][0]
+                avatar_uri = resp.content_uri
+                with open(".matrix_avatar", "w") as f:
+                    f.write(avatar_uri)
+                Matrix.set_avatar(avatar_uri)
+
+            with open(".matrix_avatar", "r") as f:
+                avatar_uri = f.read().rstrip(" \t\r\n")
+
+        if not async_to_sync(Matrix.resolve_room_alias)("#faq:tfjm.org"):
+            Matrix.create_room(
+                visibility=RoomVisibility.public,
+                alias="faq",
+                name="FAQ",
+                topic="Posez toutes vos questions ici !",
+                federate=False,
+                preset=RoomPreset.public_chat,
+            )
+
+        if not async_to_sync(Matrix.resolve_room_alias)("#annonces:tfjm.org"):
+            Matrix.create_room(
+                visibility=RoomVisibility.public,
+                alias="annonces",
+                name="Annonces",
+                topic="Informations importantes du TFJM²",
+                federate=False,
+                preset=RoomPreset.public_chat,
+            )
+
+        if not async_to_sync(Matrix.resolve_room_alias)("#je-cherche-une-equipe:tfjm.org"):
+            Matrix.create_room(
+                visibility=RoomVisibility.public,
+                alias="je-cherche-une-equipe",
+                name="Je cherche une équipe",
+                topic="Le Tinder du TFJM²",
+                federate=False,
+                preset=RoomPreset.public_chat,
+            )
+
+        if not async_to_sync(Matrix.resolve_room_alias)("#flood:tfjm.org"):
+            Matrix.create_room(
+                visibility=RoomVisibility.public,
+                alias="flood",
+                name="Flood",
+                topic="Discutez de tout et de rien !",
+                federate=False,
+                preset=RoomPreset.public_chat,
+            )
+
+        Matrix.set_room_avatar("#annonces:tfjm.org", avatar_uri)
+        Matrix.set_room_avatar("#faq:tfjm.org", avatar_uri)
+        Matrix.set_room_avatar("#je-cherche-une-equipe:tfjm.org", avatar_uri)
+        Matrix.set_room_avatar("#flood:tfjm.org", avatar_uri)
+
+        Matrix.set_room_power_level_event("#annonces:tfjm.org", "events_default", 50)
+
+        for r in Registration.objects.all():
+            Matrix.invite("#annonces:tfjm.org", f"@{r.matrix_username}:tfjm.org")
+            Matrix.invite("#faq:tfjm.org", f"@{r.matrix_username}:tfjm.org")
+            Matrix.invite("#je-cherche-une-equipe:tfjm.org",
+                          f"@{r.matrix_username}:tfjm.org")
+            Matrix.invite("#flood:tfjm.org", f"@{r.matrix_username}:tfjm.org")
+
+        for admin in AdminRegistration.objects.all():
+            Matrix.set_room_power_level("#annonces:tfjm.org",
+                                        f"@{admin.matrix_username}:tfjm.org", 95)
+            Matrix.set_room_power_level("#faq:tfjm.org",
+                                        f"@{admin.matrix_username}:tfjm.org", 95)
+            Matrix.set_room_power_level("#flood:tfjm.org",
+                                        f"@{admin.matrix_username}:tfjm.org", 95)
--- a/apps/participation/management/commands/fix_sympa_lists.py
+++ b/apps/participation/management/commands/fix_sympa_lists.py
@@ -0,0 +1,43 @@
+# Copyright (C) 2020 by Animath
+# SPDX-License-Identifier: GPL-3.0-or-later
+
+from tfjm.lists import get_sympa_client
+from django.core.management import BaseCommand
+from django.db.models import Q
+from participation.models import Team
+from registration.models import CoachRegistration, StudentRegistration
+
+
+class Command(BaseCommand):
+    def handle(self, *args, **options):
+        """
+        Create Sympa mailing lists and register teams.
+        """
+        sympa = get_sympa_client()
+
+        sympa.create_list("equipes", "Équipes du TFJM²", "hotline",
+                          "Liste de diffusion pour contacter toutes les équipes validées du TFJM².",
+                          "education", raise_error=False)
+        sympa.create_list("equipes-non-valides", "Équipes du TFJM²", "hotline",
+                          "Liste de diffusion pour contacter toutes les équipes non validées du TFJM².",
+                          "education", raise_error=False)
+
+        for problem in range(1, 4):
+            sympa.create_list(f"probleme-{problem}",
+                              f"Équipes du TFJM² participant au problème {problem}", "hotline",
+                              f"Liste de diffusion pour contacter les équipes participant au problème {problem}"
+                              f" du TFJM².", "education", raise_error=False)
+
+        for team in Team.objects.filter(participation__valid=True).all():
+            team.create_mailing_list()
+            sympa.subscribe(team.email, "equipes", f"Equipe {team.name}", True)
+            sympa.subscribe(team.email, f"probleme-{team.participation.problem}", f"Equipe {team.name}", True)
+
+        for team in Team.objects.filter(Q(participation__valid=False) | Q(participation__valid__isnull=True)).all():
+            team.create_mailing_list()
+            sympa.subscribe(team.email, "equipes-non-valides", f"Equipe {team.name}", True)
+
+        for student in StudentRegistration.objects.filter(team__isnull=False).all():
+            sympa.subscribe(student.user.email, f"equipe-{student.team.trigram.lower}", True, f"{student}")
+        for coach in CoachRegistration.objects.filter(team__isnull=False).all():
+            sympa.subscribe(coach.user.email, f"equipe-{coach.team.trigram.lower}", True, f"{coach}")
--- a/apps/participation/management/commands/setup_third_phase.py
+++ b/apps/participation/management/commands/setup_third_phase.py
@@ -0,0 +1,44 @@
+# Copyright (C) 2020 by Animath
+# SPDX-License-Identifier: GPL-3.0-or-later
+
+from tfjm.matrix import Matrix, RoomVisibility
+from django.core.management import BaseCommand
+from participation.models import Participation
+
+
+class Command(BaseCommand):
+    def handle(self, *args, **options):
+        for participation in Participation.objects.filter(valid=True).all():
+            for i, question in enumerate(participation.questions.order_by("id").all()):
+                solution_author = participation.received_participation.team
+                alias = f"equipe-{solution_author.trigram.lower()}-question-{i}"
+                room_id = f"#{alias}:tfjm.org"
+                Matrix.create_room(
+                    visibility=RoomVisibility.public,
+                    alias=alias,
+                    name=f"Solution équipe {solution_author.trigram} - question {i+1}",
+                    topic=f"Échange entre l'équipe {solution_author.name} ({solution_author.trigram}) "
+                          f"et l'équipe {participation.team.name} ({participation.team.trigram}) "
+                          f"autour de la question {i+1} sur le problème {participation.problem}",
+                    federate=False,
+                    invite=[f"@{registration.matrix_username}:tfjm.org" for registration in
+                            list(participation.team.students.all()) + list(participation.team.coachs.all()) +
+                            list(solution_author.students.all()) + list(solution_author.coachs.all())],
+                )
+                Matrix.set_room_power_level_event(room_id, "events_default", 21)
+                for registration in solution_author.students.all():
+                    Matrix.set_room_power_level(room_id,
+                                                f"@{registration.matrix_username}:tfjm.org", 42)
+
+                Matrix.send_message(room_id, "Bienvenue dans la troisième phase du TFJM² !")
+                Matrix.send_message(room_id, f"L'équipe {participation.team.name} a visionné la vidéo de l'équipe "
+                                    f"{solution_author.name} sur le problème {participation.problem}, et a posé "
+                                    "une série de questions.")
+                Matrix.send_message(room_id, "L'équipe ayant composé la vidéo doit maintenant proposer une réponse.")
+                Matrix.send_message(room_id, "Une fois la réponse apportée, vous pourrez ensuite échanger plus "
+                                             "librement autour de la question, au travers de ce canal.")
+                Matrix.send_message(room_id, "**Question posée :**", formatted_body="<strong>Question posée :</strong>")
+                Matrix.send_message(room_id, question.question,
+                                    formatted_body=f"<font color=\"#ff0000\">{question.question}</font>")
+
+                # TODO Setup the bot the set the power level of all members of the room to 42
--- a/apps/participation/migrations/0001_initial.py
+++ b/apps/participation/migrations/0001_initial.py
@@ -0,0 +1,138 @@
+# Generated by Django 3.1.3 on 2020-11-04 12:05
+
+import django.core.validators
+from django.db import migrations, models
+import django.utils.timezone
+
+
+def register_phases(apps, _):
+    """
+    Import the different phases of the action
+    """
+    Phase = apps.get_model("participation", "phase")
+    Phase.objects.get_or_create(
+        phase_number=1,
+        description="Soumission des vidéos",
+    )
+    Phase.objects.get_or_create(
+        phase_number=2,
+        description="Phase de questions",
+    )
+    Phase.objects.get_or_create(
+        phase_number=3,
+        description="Phase d'échanges entre les équipes",
+    )
+    Phase.objects.get_or_create(
+        phase_number=4,
+        description="Synthèse de l'échange",
+    )
+
+
+def reverse_phase_registering(apps, _):  # pragma: no cover
+    """
+    Drop all phases in order to unapply this migration.
+    """
+    Phase = apps.get_model("participation", "phase")
+    Phase.objects.all().delete()
+
+
+class Migration(migrations.Migration):
+
+    initial = True
+
+    dependencies = [
+    ]
+
+    operations = [
+        migrations.CreateModel(
+            name='Participation',
+            fields=[
+                ('id', models.AutoField(auto_created=True, primary_key=True, serialize=False, verbose_name='ID')),
+                ('problem', models.IntegerField(choices=[(1, 'Problem #1'), (2, 'Problem #2'), (3, 'Problem #3')], default=None, null=True, verbose_name='problem number')),
+                ('valid', models.BooleanField(default=None, help_text='The video got the validation of the administrators.', null=True, verbose_name='valid')),
+            ],
+            options={
+                'verbose_name': 'participation',
+                'verbose_name_plural': 'participations',
+            },
+        ),
+        migrations.CreateModel(
+            name='Phase',
+            fields=[
+                ('phase_number', models.AutoField(primary_key=True, serialize=False, unique=True, verbose_name='phase number')),
+                ('description', models.CharField(max_length=255, verbose_name='phase description')),
+                ('start', models.DateTimeField(default=django.utils.timezone.now, verbose_name='start date of the given phase')),
+                ('end', models.DateTimeField(default=django.utils.timezone.now, verbose_name='end date of the given phase')),
+            ],
+            options={
+                'verbose_name': 'phase',
+                'verbose_name_plural': 'phases',
+            },
+        ),
+        migrations.CreateModel(
+            name='Question',
+            fields=[
+                ('id', models.AutoField(auto_created=True, primary_key=True, serialize=False, verbose_name='ID')),
+                ('question', models.TextField(verbose_name='question')),
+            ],
+        ),
+        migrations.CreateModel(
+            name='Team',
+            fields=[
+                ('id', models.AutoField(auto_created=True, primary_key=True, serialize=False, verbose_name='ID')),
+                ('name', models.CharField(max_length=255, unique=True, verbose_name='name')),
+                ('trigram', models.CharField(help_text='The trigram must be composed of three uppercase letters.', max_length=3, unique=True, validators=[django.core.validators.RegexValidator('[A-Z]{3}')], verbose_name='trigram')),
+                ('access_code', models.CharField(help_text='The access code let other people to join the team.', max_length=6, verbose_name='access code')),
+                ('grant_animath_access_videos', models.BooleanField(default=False, help_text='Give the authorisation to publish the video on the main website to promote the action.', verbose_name='Grant Animath to publish my video')),
+            ],
+            options={
+                'verbose_name': 'team',
+                'verbose_name_plural': 'teams',
+            },
+        ),
+        migrations.CreateModel(
+            name='Video',
+            fields=[
+                ('id', models.AutoField(auto_created=True, primary_key=True, serialize=False, verbose_name='ID')),
+                ('link', models.URLField(help_text='The full video link.', verbose_name='link')),
+                ('valid', models.BooleanField(default=None, help_text='The video got the validation of the administrators.', null=True, verbose_name='valid')),
+            ],
+            options={
+                'verbose_name': 'video',
+                'verbose_name_plural': 'videos',
+            },
+        ),
+        migrations.AddIndex(
+            model_name='team',
+            index=models.Index(fields=['trigram'], name='participati_trigram_239255_idx'),
+        ),
+        migrations.AddField(
+            model_name='question',
+            name='participation',
+            field=models.ForeignKey(on_delete=django.db.models.deletion.CASCADE, related_name='questions', to='participation.participation', verbose_name='participation'),
+        ),
+        migrations.AddField(
+            model_name='participation',
+            name='received_participation',
+            field=models.OneToOneField(default=None, null=True, on_delete=django.db.models.deletion.PROTECT, related_name='sent_participation', to='participation.participation', verbose_name='received participation'),
+        ),
+        migrations.AddField(
+            model_name='participation',
+            name='solution',
+            field=models.OneToOneField(default=None, null=True, on_delete=django.db.models.deletion.SET_NULL, related_name='participation_solution', to='participation.video', verbose_name='solution video'),
+        ),
+        migrations.AddField(
+            model_name='participation',
+            name='synthesis',
+            field=models.OneToOneField(default=None, null=True, on_delete=django.db.models.deletion.SET_NULL, related_name='participation_synthesis', to='participation.video', verbose_name='synthesis video'),
+        ),
+        migrations.AddField(
+            model_name='participation',
+            name='team',
+            field=models.OneToOneField(on_delete=django.db.models.deletion.CASCADE, to='participation.team', verbose_name='team'),
+        ),
+        migrations.RunPython(
+            register_phases,
+            reverse_code=reverse_phase_registering,
+        )
+    ]
--- a/apps/participation/migrations/init.py
+++ b/apps/participation/migrations/init.py
@@ -0,0 +1,2 @@
+# Copyright (C) 2020 by Animath
+# SPDX-License-Identifier: GPL-3.0-or-later
--- a/apps/participation/models.py
+++ b/apps/participation/models.py
@@ -0,0 +1,307 @@
+# Copyright (C) 2020 by Animath
+# SPDX-License-Identifier: GPL-3.0-or-later
+
+import os
+import re
+
+from tfjm.lists import get_sympa_client
+from tfjm.matrix import Matrix, RoomPreset, RoomVisibility
+from django.core.exceptions import ObjectDoesNotExist
+from django.core.validators import RegexValidator
+from django.db import models
+from django.db.models import Index
+from django.template.loader import render_to_string
+from django.urls import reverse_lazy
+from django.utils import timezone
+from django.utils.crypto import get_random_string
+from django.utils.text import format_lazy
+from django.utils.translation import gettext_lazy as _
+
+
+class Team(models.Model):
+    """
+    The Team model represents a real team that participates to the Correspondances.
+    This only includes the registration detail.
+    """
+    name = models.CharField(
+        max_length=255,
+        verbose_name=_("name"),
+        unique=True,
+    )
+
+    trigram = models.CharField(
+        max_length=3,
+        verbose_name=_("trigram"),
+        help_text=_("The trigram must be composed of three uppercase letters."),
+        unique=True,
+        validators=[RegexValidator("[A-Z]{3}")],
+    )
+
+    access_code = models.CharField(
+        max_length=6,
+        verbose_name=_("access code"),
+        help_text=_("The access code let other people to join the team."),
+    )
+
+    grant_animath_access_videos = models.BooleanField(
+        verbose_name=_("Grant Animath to publish my video"),
+        help_text=_("Give the authorisation to publish the video on the main website to promote the action."),
+        default=False,
+    )
+
+    @property
+    def email(self):
+        """
+        :return: The mailing list to contact the team members.
+        """
+        return f"equipe-{self.trigram.lower()}@{os.getenv('SYMPA_HOST', 'localhost')}"
+
+    def create_mailing_list(self):
+        """
+        Create a new Sympa mailing list to contact the team.
+        """
+        get_sympa_client().create_list(
+            f"equipe-{self.trigram.lower()}",
+            f"Équipe {self.name} ({self.trigram})",
+            "hotline",  # TODO Use a custom sympa template
+            f"Liste de diffusion pour contacter l'équipe {self.name} du TFJM²",
+            "education",
+            raise_error=False,
+        )
+        if self.pk and self.participation.valid:  # pragma: no cover
+            get_sympa_client().subscribe(self.email, "equipes", False, f"Equipe {self.name}")
+            get_sympa_client().subscribe(self.email, f"probleme-{self.participation.problem}", False,
+                                         f"Equipe {self.name}")
+        else:
+            get_sympa_client().subscribe(self.email, "equipes-non-valides", False)
+
+    def delete_mailing_list(self):
+        """
+        Drop the Sympa mailing list, if the team is empty or if the trigram changed.
+        """
+        if self.participation.valid:  # pragma: no cover
+            get_sympa_client().unsubscribe(self.email, "equipes", False)
+            get_sympa_client().unsubscribe(self.email, f"probleme-{self.participation.problem}", False)
+        else:
+            get_sympa_client().unsubscribe(self.email, "equipes-non-valides", False)
+        get_sympa_client().delete_list(f"equipe-{self.trigram}")
+
+    def save(self, *args, **kwargs):
+        if not self.access_code:
+            # if the team got created, generate the access code, create the contact mailing list
+            # and create a dedicated Matrix room.
+            self.access_code = get_random_string(6)
+            self.create_mailing_list()
+
+            Matrix.create_room(
+                visibility=RoomVisibility.private,
+                name=f"#équipe-{self.trigram.lower()}",
+                alias=f"equipe-{self.trigram.lower()}",
+                topic=f"Discussion de l'équipe {self.name}",
+                preset=RoomPreset.private_chat,
+            )
+
+        return super().save(*args, **kwargs)
+
+    def get_absolute_url(self):
+        return reverse_lazy("participation:team_detail", args=(self.pk,))
+
+    def __str__(self):
+        return _("Team {name} ({trigram})").format(name=self.name, trigram=self.trigram)
+
+    class Meta:
+        verbose_name = _("team")
+        verbose_name_plural = _("teams")
+        indexes = [
+            Index(fields=("trigram", )),
+        ]
+
+
+class Participation(models.Model):
+    """
+    The Participation model contains all data that are related to the participation:
+    chosen problem, validity status, videos,...
+    """
+    team = models.OneToOneField(
+        Team,
+        on_delete=models.CASCADE,
+        verbose_name=_("team"),
+    )
+
+    problem = models.IntegerField(
+        choices=[(i, format_lazy(_("Problem #{problem:d}"), problem=i)) for i in range(1, 4)],
+        null=True,
+        default=None,
+        verbose_name=_("problem number"),
+    )
+
+    valid = models.BooleanField(
+        null=True,
+        default=None,
+        verbose_name=_("valid"),
+        help_text=_("The video got the validation of the administrators."),
+    )
+
+    solution = models.OneToOneField(
+        "participation.Video",
+        on_delete=models.SET_NULL,
+        related_name="participation_solution",
+        null=True,
+        default=None,
+        verbose_name=_("solution video"),
+    )
+
+    received_participation = models.OneToOneField(
+        "participation.Participation",
+        on_delete=models.PROTECT,
+        related_name="sent_participation",
+        null=True,
+        default=None,
+        verbose_name=_("received participation"),
+    )
+
+    synthesis = models.OneToOneField(
+        "participation.Video",
+        on_delete=models.SET_NULL,
+        related_name="participation_synthesis",
+        null=True,
+        default=None,
+        verbose_name=_("synthesis video"),
+    )
+
+    def get_absolute_url(self):
+        return reverse_lazy("participation:participation_detail", args=(self.pk,))
+
+    def __str__(self):
+        return _("Participation of the team {name} ({trigram})").format(name=self.team.name, trigram=self.team.trigram)
+
+    class Meta:
+        verbose_name = _("participation")
+        verbose_name_plural = _("participations")
+
+
+class Video(models.Model):
+    """
+    The Video model only contains a link and a validity status.
+    """
+    link = models.URLField(
+        verbose_name=_("link"),
+        help_text=_("The full video link."),
+    )
+
+    valid = models.BooleanField(
+        null=True,
+        default=None,
+        verbose_name=_("valid"),
+        help_text=_("The video got the validation of the administrators."),
+    )
+
+    @property
+    def participation(self):
+        """
+        Retrives the participation that is associated to this video,
+        whatever it is a solution or a synthesis.
+        """
+        try:
+            # If this is a solution
+            return self.participation_solution
+        except ObjectDoesNotExist:
+            # If this is a synthesis
+            return self.participation_synthesis
+
+    @property
+    def platform(self):
+        """
+        According to the link, retrieve the platform that is used to upload the video.
+        """
+        if "youtube.com" in self.link or "youtu.be" in self.link:
+            return "youtube"
+        return "unknown"
+
+    @property
+    def youtube_code(self):
+        """
+        If the video is uploaded on Youtube, search in the URL the video code.
+        """
+        return re.compile("(https?://|)(www\\.|)(youtube\\.com/watch\\?v=|youtu\\.be/)([a-zA-Z0-9-_]*)?.*?")\
+            .match(self.link).group(4)
+
+    def as_iframe(self):
+        """
+        Generate the HTML code to embed the video in an iframe, according to the type of the host platform.
+        """
+        if self.platform == "youtube":
+            return render_to_string("participation/youtube_iframe.html", context=dict(youtube_code=self.youtube_code))
+        return None
+
+    def __str__(self):
+        return _("Video of team {name} ({trigram})")\
+            .format(name=self.participation.team.name, trigram=self.participation.team.trigram)
+
+    class Meta:
+        verbose_name = _("video")
+        verbose_name_plural = _("videos")
+
+
+class Question(models.Model):
+    """
+    Question to ask to the team that sent a solution.
+    """
+    participation = models.ForeignKey(
+        Participation,
+        on_delete=models.CASCADE,
+        verbose_name=_("participation"),
+        related_name="questions",
+    )
+
+    question = models.TextField(
+        verbose_name=_("question"),
+    )
+
+    def __str__(self):
+        return self.question
+
+
+class Phase(models.Model):
+    """
+    The Phase model corresponds to the dates of the phase.
+    """
+    phase_number = models.AutoField(
+        primary_key=True,
+        unique=True,
+        verbose_name=_("phase number"),
+    )
+
+    description = models.CharField(
+        max_length=255,
+        verbose_name=_("phase description"),
+    )
+
+    start = models.DateTimeField(
+        verbose_name=_("start date of the given phase"),
+        default=timezone.now,
+    )
+
+    end = models.DateTimeField(
+        verbose_name=_("end date of the given phase"),
+        default=timezone.now,
+    )
+
+    @classmethod
+    def current_phase(cls):
+        """
+        Retrieve the current phase of this day
+        """
+        qs = Phase.objects.filter(start__lte=timezone.now(), end__gte=timezone.now())
+        if qs.exists():
+            return qs.get()
+        qs = Phase.objects.filter(start__lte=timezone.now()).order_by("phase_number").all()
+        return qs.last() if qs.exists() else None
+
+    def __str__(self):
+        return _("Phase {phase_number:d} starts on {start:%Y-%m-%d %H:%M} and ends on {end:%Y-%m-%d %H:%M}")\
+            .format(phase_number=self.phase_number, start=self.start, end=self.end)
+
+    class Meta:
+        verbose_name = _("phase")
+        verbose_name_plural = _("phases")
--- a/apps/participation/search_indexes.py
+++ b/apps/participation/search_indexes.py
@@ -0,0 +1,36 @@
+# Copyright (C) 2020 by Animath
+# SPDX-License-Identifier: GPL-3.0-or-later
+
+from haystack import indexes
+
+from .models import Participation, Team, Video
+
+
+class TeamIndex(indexes.ModelSearchIndex, indexes.Indexable):
+    """
+    Index all teams by their name and trigram.
+    """
+    text = indexes.NgramField(document=True, use_template=True)
+
+    class Meta:
+        model = Team
+
+
+class ParticipationIndex(indexes.ModelSearchIndex, indexes.Indexable):
+    """
+    Index all participations by their team name and team trigram.
+    """
+    text = indexes.NgramField(document=True, use_template=True)
+
+    class Meta:
+        model = Participation
+
+
+class VideoIndex(indexes.ModelSearchIndex, indexes.Indexable):
+    """
+    Index all teams by their team name and team trigram.
+    """
+    text = indexes.NgramField(document=True, use_template=True)
+
+    class Meta:
+        model = Video
--- a/apps/participation/signals.py
+++ b/apps/participation/signals.py
@@ -0,0 +1,46 @@
+# Copyright (C) 2020 by Animath
+# SPDX-License-Identifier: GPL-3.0-or-later
+
+from tfjm.lists import get_sympa_client
+from participation.models import Participation, Team, Video
+
+
+def create_team_participation(instance, created, **_):
+    """
+    When a team got created, create an associated team and create Video objects.
+    """
+    participation = Participation.objects.get_or_create(team=instance)[0]
+    if not participation.solution:
+        participation.solution = Video.objects.create()
+    if not participation.synthesis:
+        participation.synthesis = Video.objects.create()
+    participation.save()
+    if not created:
+        participation.team.create_mailing_list()
+
+
+def update_mailing_list(instance: Team, **_):
+    """
+    When a team name or trigram got updated, update mailing lists and Matrix rooms
+    """
+    if instance.pk:
+        old_team = Team.objects.get(pk=instance.pk)
+        if old_team.name != instance.name or old_team.trigram != instance.trigram:
+            # TODO Rename Matrix room
+            # Delete old mailing list, create a new one
+            old_team.delete_mailing_list()
+            instance.create_mailing_list()
+            # Subscribe all team members in the mailing list
+            for student in instance.students.all():
+                get_sympa_client().subscribe(student.user.email, f"equipe-{instance.trigram.lower()}", False,
+                                             f"{student.user.first_name} {student.user.last_name}")
+            for coach in instance.coachs.all():
+                get_sympa_client().subscribe(coach.user.email, f"equipe-{instance.trigram.lower()}", False,
+                                             f"{coach.user.first_name} {coach.user.last_name}")
+
+
+def delete_related_videos(instance: Participation, **_):
+    if instance.solution:
+        instance.solution.delete()
+    if instance.synthesis:
+        instance.synthesis.delete()
--- a/apps/participation/tables.py
+++ b/apps/participation/tables.py
@@ -0,0 +1,91 @@
+# Copyright (C) 2020 by Animath
+# SPDX-License-Identifier: GPL-3.0-or-later
+
+from django.utils import timezone
+from django.utils.translation import gettext_lazy as _
+import django_tables2 as tables
+
+from .models import Phase, Team
+
+
+class CalendarTable(tables.Table):
+    class Meta:
+        attrs = {
+            'class': 'table table condensed table-striped',
+        }
+        row_attrs = {
+            'class': lambda record: 'bg-success' if timezone.now() > record.end else
+                                    'bg-warning' if timezone.now() > record.start else
+                                    'bg-danger',
+            'data-id': lambda record: str(record.phase_number),
+        }
+        model = Phase
+        fields = ('phase_number', 'description', 'start', 'end',)
+        template_name = 'django_tables2/bootstrap4.html'
+        order_by = ('phase_number',)
+
+
+# noinspection PyTypeChecker
+class TeamTable(tables.Table):
+    name = tables.LinkColumn(
+        'participation:team_detail',
+        args=[tables.A("id")],
+        verbose_name=lambda: _("name").capitalize(),
+    )
+
+    problem = tables.Column(
+        accessor="participation__problem",
+        verbose_name=lambda: _("problem number").capitalize(),
+    )
+
+    class Meta:
+        attrs = {
+            'class': 'table table condensed table-striped',
+        }
+        model = Team
+        fields = ('name', 'trigram', 'problem',)
+        template_name = 'django_tables2/bootstrap4.html'
+
+
+# noinspection PyTypeChecker
+class ParticipationTable(tables.Table):
+    name = tables.LinkColumn(
+        'participation:participation_detail',
+        args=[tables.A("id")],
+        verbose_name=lambda: _("name").capitalize(),
+        accessor="team__name",
+    )
+
+    trigram = tables.Column(
+        verbose_name=lambda: _("trigram").capitalize(),
+        accessor="team__trigram",
+    )
+
+    problem = tables.Column(
+        verbose_name=lambda: _("problem number").capitalize(),
+    )
+
+    class Meta:
+        attrs = {
+            'class': 'table table condensed table-striped',
+        }
+        model = Team
+        fields = ('name', 'trigram', 'problem',)
+        template_name = 'django_tables2/bootstrap4.html'
+
+
+class VideoTable(tables.Table):
+    participation_name = tables.LinkColumn(
+        'participation:participation_detail',
+        args=[tables.A("participation__pk")],
+        verbose_name=lambda: _("name").capitalize(),
+        accessor=tables.A("participation__team__name"),
+    )
+
+    class Meta:
+        attrs = {
+            'class': 'table table condensed table-striped',
+        }
+        model = Team
+        fields = ('participation_name', 'link',)
+        template_name = 'django_tables2/bootstrap4.html'
--- a/apps/participation/templates/participation/chat.html
+++ b/apps/participation/templates/participation/chat.html
@@ -0,0 +1,39 @@
+{% extends "base.html" %}
+
+{% load i18n %}
+
+{% block content %}
+    <div class="alert alert-warning">
+    {% blocktrans trimmed %}
+        The chat is located on the dedicated Matrix server:
+    {% endblocktrans %}
+    </div>
+
+    <div class="alert text-center">
+    <a class="btn btn-success" href="https://element.tfjm.org/#/room/#faq:tfjm.org" target="_blank">
+        <i class="fas fa-server"></i> {% trans "Access to the Matrix server" %}
+    </a>
+    </div>
+
+    <div class="alert alert-info">
+    <p>
+    {% blocktrans trimmed %}
+        To connect to the server, you can select "Log in", then use your credentials of this platform to connect
+        with the central authentication server, then you must trust the connection between the Matrix account and the
+        platform. Finally, you will be able to access to the chat platform.
+    {% endblocktrans %}
+    </p>
+
+    <p>
+    {% blocktrans trimmed %}
+        You will be invited in some basic rooms. You must confirm the invitations to join channels.
+    {% endblocktrans %}
+    </p>
+
+    <p>
+    {% blocktrans trimmed %}
+        If you have any trouble, don't hesitate to contact us :)
+    {% endblocktrans %}
+    </p>
+    </div>
+{% endblock %}
--- a/apps/participation/templates/participation/create_team.html
+++ b/apps/participation/templates/participation/create_team.html
@@ -0,0 +1,13 @@
+{% extends "base.html" %}
+
+{% load crispy_forms_filters i18n %}
+
+{% block content %}
+    <form method="post">
+        <div id="form-content">
+            {% csrf_token %}
+            {{ form|crispy }}
+        </div>
+        <button class="btn btn-success" type="submit">{% trans "Create" %}</button>
+    </form>
+{% endblock content %}
--- a/apps/participation/templates/participation/join_team.html
+++ b/apps/participation/templates/participation/join_team.html
@@ -0,0 +1,13 @@
+{% extends "base.html" %}
+
+{% load crispy_forms_filters i18n %}
+
+{% block content %}
+    <form method="post">
+        <div id="form-content">
+            {% csrf_token %}
+            {{ form|crispy }}
+        </div>
+        <button class="btn btn-primary" type="submit">{% trans "Join" %}</button>
+    </form>
+{% endblock content %}
--- a/apps/participation/templates/participation/mails/request_validation.html
+++ b/apps/participation/templates/participation/mails/request_validation.html
@@ -0,0 +1,29 @@
+<!DOCTYPE html>
+<html lang="fr">
+<head>
+    <meta charset="UTF-8">
+    <title>Demande de validation - TFJM²</title>
+</head>
+<body>
+<p>
+Bonjour {{ user.registration }},
+</p>
+
+<p>
+L'équipe « {{ team.name }} » ({{ team.trigram }}) vient de demander à valider son équipe pour participer
+au {{ team.participation.get_problem_display }} du TFJM² des Jeunes Mathématicien·ne·s.
+Vous pouvez décider d'accepter ou de refuser l'équipe en vous rendant sur la page de l'équipe :
+<a href="https://{{ domain }}{% url "participation:team_detail" pk=team.pk %}">
+    https://{{ domain }}{% url "participation:team_detail" pk=team.pk %}
+</a>
+</p>
+
+<p>
+Cordialement,
+</p>
+
+<p>
+L'organisation du TFJM² des Jeunes Mathématicien·ne·s
+</p>
+</body>
+</html>
--- a/apps/participation/templates/participation/mails/request_validation.txt
+++ b/apps/participation/templates/participation/mails/request_validation.txt
@@ -0,0 +1,10 @@
+Bonjour {{ user.registration }},
+
+L'équipe « {{ team.name }} » ({{ team.trigram }}) vient de demander à valider son équipe pour participer
+au {{ team.participation.get_problem_display }} du TFJM² des Jeunes Mathématicien·ne·s.
+Vous pouvez décider d'accepter ou de refuser l'équipe en vous rendant sur la page de l'équipe :
+https://{{ domain }}{% url "participation:team_detail" pk=team.pk %}
+
+Cordialement,
+
+L'organisation du TFJM² des Jeunes Mathématicien·ne·s
--- a/apps/participation/templates/participation/mails/team_not_validated.html
+++ b/apps/participation/templates/participation/mails/team_not_validated.html
@@ -0,0 +1,22 @@
+<!DOCTYPE html>
+<html lang="fr">
+<head>
+    <meta charset="UTF-8">
+    <title>Équipe non validée – TFJM²</title>
+</head>
+<body>
+Bonjour,<br/>
+<br />
+Maleureusement, votre équipe « {{ team.name }} » ({{ team.trigram }}) n'a pas été validée. Veuillez vérifier que vos autorisations
+de droit à l'image sont correctes. Les organisateurs vous adressent ce message :<br />
+<br />
+{{ message }}<br />
+<br />
+N'hésitez pas à nous contacter à l'adresse <a href="mailto:contact@tfjm.org">contact@tfjm.org</a>
+pour plus d'informations.
+<br/>
+Cordialement,<br/>
+<br/>
+Le comité d'organisation du TFJM² des Jeunes Mathématicien·ne·s
+</body>
+</html>
--- a/apps/participation/templates/participation/mails/team_not_validated.txt
+++ b/apps/participation/templates/participation/mails/team_not_validated.txt
@@ -0,0 +1,12 @@
+Bonjour,
+
+Maleureusement, votre équipe « {{ team.name }} » ({{ team.trigram }}) n'a pas été validée. Veuillez vérifier que vos
+autorisations de droit à l'image sont correctes. Les organisateurs vous adressent ce message :
+
+{{ message }}
+
+N'hésitez pas à nous contacter à l'adresse contact@tfjm.org pour plus d'informations.
+
+Cordialement,
+
+Le comité d'organisation du TFJM² des Jeunes Mathématicien·ne·s
--- a/apps/participation/templates/participation/mails/team_validated.html
+++ b/apps/participation/templates/participation/mails/team_validated.html
@@ -0,0 +1,20 @@
+<!DOCTYPE html>
+<html lang="fr">
+<head>
+    <meta charset="UTF-8">
+    <title>Équipe validée – TFJM²</title>
+</head>
+<body>
+Bonjour,<br/>
+<br/>
+Félicitations ! Votre équipe « {{ team.name }} » ({{ team.trigram }}) est désormais validée ! Vous êtes désormais apte à travailler sur
+votre problème. Lorsque les Correspondances auront débutées, vous pourrez soumettre votre vidéo sur la plateforme d'inscription.<br>
+Les organisateurs vous adressent ce message :<br/>
+<br/>
+{{ message }}<br />
+<br/>
+Cordialement,<br/>
+<br/>
+Le comité d'organisation du TFJM² des Jeunes Mathématicien·ne·s
+</body>
+</html>
--- a/apps/participation/templates/participation/mails/team_validated.txt
+++ b/apps/participation/templates/participation/mails/team_validated.txt
@@ -0,0 +1,12 @@
+Bonjour,
+
+Félicitations ! Votre équipe « {{ team.name }} » ({{ team.trigram }}) est désormais validée ! Vous êtes désormais apte à travailler sur
+votre problème. Lorsque les Correspondances auront débutées, vous pourrez soumettre votre vidéo sur la plateforme d'inscription.
+
+Les organisateurs vous adressent ce message :
+
+{{ message }}
+
+Cordialement,
+
+Le comité d'organisation du TFJM² des Jeunes Mathématicien·ne·s
--- a/apps/participation/templates/participation/participation_detail.html
+++ b/apps/participation/templates/participation/participation_detail.html
@@ -0,0 +1,300 @@
+{% extends "base.html" %}
+
+{% load i18n %}
+
+{% block content %}
+{% trans "any" as any %}
+    <div class="card bg-light shadow">
+        <div class="card-header text-center">
+            <h4>{% trans "Participation of team" %} {{ participation.team.name }} ({{ participation.team.trigram }})</h4>
+        </div>
+        <div class="card-body">
+            <dl class="row">
+                <dt class="col-sm-2">{% trans "Team:" %}</dt>
+                <dd class="col-sm-10"><a href="{% url "participation:team_detail" pk=participation.team.pk %}">{{ participation.team }}</a></dd>
+
+                <dt class="col-sm-2">{% trans "Chosen problem:" %}</dt>
+                <dd class="col-sm-10">{{ participation.get_problem_display }}</dd>
+            </dl>
+
+            <div id="solution-container">
+                <dl class="row">
+                    {% trans "No video sent" as novideo %}
+                    <dt class="col-sm-2">{% trans "Proposed solution:" %}</dt>
+                    <dd class="col-sm-10"><a href="{{ participation.solution.link|default:"#" }}"{% if participation.solution.link %} target="_blank"{% endif %}>
+                        {{ participation.solution.link|default:novideo }}</a>
+                        {% if current_phase.phase_number == 1 or participation.solution.link == "" %}
+                            <button class="btn btn-primary" data-toggle="modal" data-target="#uploadSolutionModal">{% trans "Upload" %}</button>
+                        {% endif %}
+                        {% if participation.solution.link %}
+                            <button class="btn btn-info" data-toggle="modal" data-target="#displaySolutionModal">{% trans "Display" %}</button>
+                        {% endif %}
+                    </dd>
+                </dl>
+            </div>
+        </div>
+    </div>
+
+    {% if user.registration.is_admin or current_phase.phase_number >= 2 %}
+    <hr>
+
+    <div class="row">
+        <div class="col-md-6">
+            <div class="card bg-light shadow">
+                <div class="card-header text-center">
+                    <h4>{% trans "Sent solution" %}</h4>
+                </div>
+                <div class="card-body">
+                    <dl class="row">
+                        <dt class="col-xl-5 text-right">{% trans "Team that received your solution:" %}</dt>
+                        <dd class="col-md-5">{{ participation.sent_participation.team|default:any }}</dd>
+                        {% if user.registration.is_admin %}
+                            <dd class="col-xs-2">
+                                <button class="btn btn-primary" data-toggle="modal" data-target="#defineSentParticipationModal">{% trans "Change" %}</button>
+                            </dd>
+                        {% endif %}
+                    </dl>
+
+                    {% if current_phase.phase_number == 2 %}
+                        <div class="alert alert-info">
+                            {% blocktrans trimmed %}
+                                The mentioned team received your video. They are now watching your video,
+                                and formulating questions. You would be able to exchange with the other phase during
+                                the next phase.
+                            {% endblocktrans %}
+                        </div>
+                    {% elif current_phase.phase_number == 3 %}
+                        <div class="alert alert-info">
+                            {% blocktrans trimmed with user_id=user.pk %}
+                                The other team sent you questions about your solution. Your are now able to answer them,
+                                then to exchange freely with the other team. You can click on the Chat button, or to
+                                connect to your dedicated Matrix account:
+                                <code>@tfjm_{{ user_id }}:tfjm.org</code>.
+                                You can use your own Matrix client, or use the dedicated Element client:
+                                <a href="https://element.tfjm.org">element.correpondances-maths.fr</a>
+                            {% endblocktrans %}
+                        </div>
+                    {% elif current_phase.phase_number == 4 %}
+                        <dl class="row">
+                            <dt class="col-xl-5 text-right">{% trans "Synthesis from the other team:" %}</dt>
+                            <dd class="col-sm-7"><a href="{{ participation.received_participation.synthesis.link|default:"#" }}"{% if participation.received_participation.synthesis.link %} target="_blank"{% endif %}>
+                                {{ participation.received_participation.synthesis.link|default:novideo }}</a>
+                                {% if participation.received_participation.synthesis.link %}
+                                    <button class="btn btn-info" data-toggle="modal" data-target="#displayOtherSynthesisModal">{% trans "Display" %}</button>
+                                {% endif %}
+                            </dd>
+                        </dl>
+                    {% endif %}
+                </div>
+            </div>
+        </div>
+        <div class="col-md-6">
+            <div class="card bg-light shadow">
+                <div class="card-header text-center">
+                    <h4>{% trans "Received solution" %}</h4>
+                </div>
+                <div class="card-body">
+                    <dl class="row">
+                        <dt class="col-xl-5 text-right">{% trans "Team that sent you their solution:" %}</dt>
+                        <dd class="col-md-5">{{ participation.received_participation.team|default:any }}</dd>
+                        {% if user.registration.is_admin %}
+                            <dd class="col-xs-2">
+                                <button class="btn btn-primary" data-toggle="modal" data-target="#defineReceivedParticipationModal">{% trans "Change" %}</button>
+                            </dd>
+                        {% endif %}
+
+                        <dt class="col-xl-5 text-right">{% trans "Proposed solution:" %}</dt>
+                        <dd class="col-sm-7"><a href="{{ participation.received_participation.solution.link|default:"#" }}"{% if participation.received_participation.solution.link %} target="_blank"{% endif %}>
+                            {{ participation.received_participation.solution.link|default:novideo }}</a>
+                            {% if participation.received_participation.solution.link %}
+                                <button class="btn btn-info" data-toggle="modal" data-target="#displayOtherSolutionModal">{% trans "Display" %}</button>
+                            {% endif %}
+                        </dd>
+
+                    {% if current_phase.phase_number == 2 %}
+                        <div class="alert alert-info">
+                        {% blocktrans trimmed %}
+                            You received a solution about the same problem that you treated from another team.
+                            You are now encouraged to see the video, then to ask from 3 to 6 questions about the video.
+                            After that, you will be invited to exchange with the other team about the solution.
+                        {% endblocktrans %}
+                        </div>
+
+                        {% for question in participation.questions.all %}
+                            <dd class="col-md-9 text-truncate">{{ question.question }}</dd>
+                            <dd class="col-md-3">
+                                <button class="btn btn-primary" data-toggle="modal" data-target="#updateQuestion{{ forloop.counter }}Modal">{% trans "Change" %}</button>
+                            </dd>
+                            <hr>
+                        {% endfor %}
+
+                        {% if user.registration.participates %}
+                            <button class="btn btn-success" data-toggle="modal" data-target="#addQuestionModal">
+                                <i class="fas fa-plus-circle"></i> {% trans "Add a question" %}
+                            </button>
+                        {% endif %}
+                    {% elif current_phase.phase_number == 3 %}
+                        <div class="alert alert-info">
+                            {% blocktrans trimmed with user_id=user.pk %}
+                                You sent your questions to the other team about their solution. When they answer to
+                                your questions, you will be able to exchange freely with the other team.
+                                You can click on the Chat button, or to connect to your dedicated Matrix account:
+                                <code>@tfjm_{{ user_id }}:tfjm.org</code>.
+                                You can use your own Matrix client, or use the dedicated Element client:
+                                <a href="https://element.tfjm.org">element.correpondances-maths.fr</a>
+                            {% endblocktrans %}
+                        </div>
+                    {% elif current_phase.phase_number == 4 %}
+                        <div id="solution-container">
+                            <dl class="row">
+                                {% trans "No video sent" as novideo %}
+                                <dt class="col-sm-5 text-right">{% trans "Your synthesis of the exchange:" %}</dt>
+                                <dd class="col-sm-7"><a href="{{ participation.synthesis.link|default:"#" }}"{% if participation.synthesis.link %} target="_blank"{% endif %}>
+                                    {{ participation.synthesis.link|default:novideo }}</a>
+                                    <button class="btn btn-primary" data-toggle="modal" data-target="#uploadSynthesisModal">{% trans "Upload" %}</button>
+                                    {% if participation.synthesis.link %}
+                                        <button class="btn btn-info" data-toggle="modal" data-target="#displaySynthesisModal">{% trans "Display" %}</button>
+                                    {% endif %}
+                                </dd>
+                            </dl>
+                        </div>
+                    {% endif %}
+                    </dl>
+                </div>
+            </div>
+        </div>
+    </div>
+    {% endif %}
+
+{% if user.registration.is_admin %}
+    {% trans "Define received video" as modal_title %}
+    {% trans "Update" as modal_button %}
+    {% url "participation:participation_receive_participation" pk=participation.pk as modal_action %}
+    {% include "base_modal.html" with modal_id="defineReceivedParticipation" %}
+
+    {% trans "Define team that receives your video" as modal_title %}
+    {% trans "Update" as modal_button %}
+    {% url "participation:participation_send_participation" pk=participation.pk as modal_action %}
+    {% include "base_modal.html" with modal_id="defineSentParticipation" %}
+{% endif %}
+
+{% trans "Upload video" as modal_title %}
+{% trans "Upload" as modal_button %}
+{% url "participation:upload_video" pk=participation.solution_id as modal_action %}
+{% include "base_modal.html" with modal_id="uploadSolution" %}
+
+{% trans "Display solution" as modal_title %}
+{% trans "This video platform is not supported yet." as unsupported_platform %}
+{% include "base_modal.html" with modal_id="displaySolution" modal_action="" modal_button="" modal_additional_class="modal-lg" modal_content=participation.solution.as_iframe|default:unsupported_platform %}
+
+
+{% if user.registration.is_admin or current_phase.phase_number >= 2 %}
+    {% if participation.received_participation.solution.link %}
+        {% trans "Display solution" as modal_title %}
+        {% trans "This video platform is not supported yet." as unsupported_platform %}
+        {% include "base_modal.html" with modal_id="displayOtherSolution" modal_action="" modal_button="" modal_additional_class="modal-lg" modal_content=participation.received_participation.solution.as_iframe|default:unsupported_platform %}
+    {% endif %}
+{% endif %}
+
+{% if user.registration.participates and current_phase.phase_number == 2 %}
+    {% trans "Add question" as modal_title %}
+    {% trans "Add" as modal_button %}
+    {% url "participation:add_question" pk=participation.pk as modal_action %}
+    {% include "base_modal.html" with modal_id="addQuestion" modal_button_type="success" %}
+    {% for question in participation.questions.all %}
+        {% with number_str=forloop.counter|stringformat:"d"%}
+            {% with modal_id="updateQuestion"|add:number_str %}
+                {% trans "Delete" as delete %}
+                {% with extra_modal_button='<button class="btn btn-danger" type="button" data-dismiss="modal" data-toggle="modal" data-target="#deleteQuestion'|add:number_str|add:'Modal">'|add:delete|add:"</button>"|safe %}
+                    {% trans "Update question" as modal_title %}
+                    {% trans "Update" as modal_button %}
+                    {% url "participation:update_question" pk=question.pk as modal_action %}
+                    {% include "base_modal.html" %}
+                {% endwith %}
+            {% endwith %}
+
+            {% with modal_id="deleteQuestion"|add:number_str %}
+                {% trans "Delete question" as modal_title %}
+                {% trans "Delete" as modal_button %}
+                {% url "participation:delete_question" pk=question.pk as modal_action %}
+                {% include "base_modal.html" with modal_button_type="danger" %}
+            {% endwith %}
+        {% endwith %}
+    {% endfor %}
+{% endif %}
+
+{% if current_phase.phase_number >= 4 %}
+    {% if participation.received_participation.synthesis.link %}
+        {% trans "Display synthesis" as modal_title %}
+        {% trans "This video platform is not supported yet." as unsupported_platform %}
+        {% include "base_modal.html" with modal_id="displayOtherSynthesis" modal_action="" modal_button="" modal_additional_class="modal-lg" modal_content=participation.received_participation.synthesis.as_iframe|default:unsupported_platform %}
+    {% endif %}
+
+    {% trans "Upload video" as modal_title %}
+    {% trans "Upload" as modal_button %}
+    {% url "participation:upload_video" pk=participation.synthesis_id as modal_action %}
+    {% include "base_modal.html" with modal_id="uploadSynthesis" %}
+
+    {% if participation.synthesis.link %}
+        {% trans "Display synthesis" as modal_title %}
+        {% trans "This video platform is not supported yet." as unsupported_platform %}
+        {% include "base_modal.html" with modal_id="displaySynthesis" modal_action="" modal_button="" modal_additional_class="modal-lg" modal_content=participation.synthesis.as_iframe|default:unsupported_platform %}
+    {% endif %}
+{% endif %}
+{% endblock %}
+
+{% block extrajavascript %}
+    <script>
+        $(document).ready(function() {
+            {% if user.registration.is_admin %}
+                $('button[data-target="#defineReceivedParticipationModal"]').click(function() {
+                    let modalBody = $("#defineReceivedParticipationModal div.modal-body");
+                    if (!modalBody.html().trim())
+                        modalBody.load("{% url "participation:participation_receive_participation" pk=participation.pk %} #form-content");
+                });
+
+                $('button[data-target="#defineSentParticipationModal"]').click(function() {
+                    let modalBody = $("#defineSentParticipationModal div.modal-body");
+                    if (!modalBody.html().trim())
+                        modalBody.load("{% url "participation:participation_send_participation" pk=participation.pk %} #form-content");
+                });
+            {% endif %}
+
+            {% if user.registration.participates and current_phase.phase_number == 2 %}
+                $('button[data-target="#addQuestionModal"]').click(function() {
+                    let modalBody = $("#addQuestionModal div.modal-body");
+                    if (!modalBody.html().trim())
+                        modalBody.load("{% url "participation:add_question" pk=participation.pk %} #form-content");
+                });
+
+                {% for question in participation.questions.all %}
+                    $('button[data-target="#updateQuestion{{ forloop.counter }}Modal"]').click(function() {
+                        let modalBody = $("#updateQuestion{{ forloop.counter }}Modal div.modal-body");
+                        if (!modalBody.html().trim())
+                            modalBody.load("{% url "participation:update_question" pk=question.pk %} #form-content");
+                    });
+
+                    $('button[data-target="#deleteQuestion{{ forloop.counter }}Modal"]').click(function() {
+                        let modalBody = $("#deleteQuestion{{ forloop.counter }}Modal div.modal-body");
+                        if (!modalBody.html().trim())
+                            modalBody.load("{% url "participation:delete_question" pk=question.pk %} #form-content");
+                    });
+                {% endfor %}
+            {% endif %}
+
+            $('button[data-target="#uploadSolutionModal"]').click(function() {
+                let modalBody = $("#uploadSolutionModal div.modal-body");
+                if (!modalBody.html().trim())
+                    modalBody.load("{% url "participation:upload_video" pk=participation.solution_id %} #form-content");
+            });
+
+            {% if current_phase.phase_number == 4 %}
+                $('button[data-target="#uploadSynthesisModal"]').click(function() {
+                    let modalBody = $("#uploadSynthesisModal div.modal-body");
+                    if (!modalBody.html().trim())
+                        modalBody.load("{% url "participation:upload_video" pk=participation.synthesis_id %} #form-content");
+                });
+            {% endif %}
+        });
+    </script>
+{% endblock %}
--- a/apps/participation/templates/participation/phase_form.html
+++ b/apps/participation/templates/participation/phase_form.html
@@ -0,0 +1,14 @@
+{% extends "base.html" %}
+
+{% load crispy_forms_filters i18n %}
+
+{% block content %}
+    <form method="post" action="{% url "participation:update_phase" pk=object.pk %}">
+        <div id="form-content">
+            {% csrf_token %}
+            {{ form|crispy }}
+        </div>
+        <button class="btn btn-primary" type="submit">{% trans "Update" %}</button>
+    </form>
+{% endblock content %}
+
--- a/apps/participation/templates/participation/phase_list.html
+++ b/apps/participation/templates/participation/phase_list.html
@@ -0,0 +1,35 @@
+{% extends "base.html" %}
+
+{% load django_tables2 i18n static %}
+
+{% block extracss %}
+    <link rel="stylesheet" href="{% static "bootstrap_datepicker_plus/css/datepicker-widget.css" %}">
+{% endblock %}
+
+{% block contenttitle %}
+    <h2>{% trans "Calendar" %}</h2>
+{% endblock %}
+
+{% block content %}
+    <div id="form-content">
+        {% render_table table %}
+
+        {% trans "Update phase" as modal_title %}
+        {% trans "Update" as modal_button %}
+        {% include "base_modal.html" with modal_id="updatePhase" %}
+    </div>
+{% endblock %}
+
+{% block extrajavascript %}
+{% if user.registration.is_admin %}
+    <script>
+        $("tr").click(function () {
+            let modalBody = $("#updatePhaseModal div.modal-body");
+            if (!modalBody.html().trim())
+                modalBody.load("{% url "participation:calendar" %}" + $(this).data("id") + "/ #form-content");
+            $("#updatePhase-form").attr("action", "{% url "participation:calendar" %}" + $(this).data("id") + "/")
+            $("#updatePhaseModal").modal();
+        })
+    </script>
+{% endif %}
+{% endblock %}
--- a/apps/participation/templates/participation/question_confirm_delete.html
+++ b/apps/participation/templates/participation/question_confirm_delete.html
@@ -0,0 +1,17 @@
+{% extends "base.html" %}
+
+{% load crispy_forms_filters i18n %}
+
+{% block content %}
+    <form method="post">
+        <div id="form-content">
+            <div class="alert alert-danger">
+                {% trans "Are you sure you want to delete this question?" %}
+            </div>
+            {% csrf_token %}
+            {{ form|crispy }}
+        </div>
+        <button class="btn btn-danger" type="submit">{% trans "Delete" %}</button>
+    </form>
+{% endblock content %}
+
--- a/apps/participation/templates/participation/question_form.html
+++ b/apps/participation/templates/participation/question_form.html
@@ -0,0 +1,14 @@
+{% extends "base.html" %}
+
+{% load crispy_forms_filters i18n %}
+
+{% block content %}
+    <form method="post">
+        <div id="form-content">
+            {% csrf_token %}
+            {{ form|crispy }}
+        </div>
+        <button class="btn btn-primary" type="submit">{% trans "Send" %}</button>
+    </form>
+{% endblock content %}
+
--- a/apps/participation/templates/participation/receive_participation_form.html
+++ b/apps/participation/templates/participation/receive_participation_form.html
@@ -0,0 +1,14 @@
+{% extends "base.html" %}
+
+{% load crispy_forms_filters i18n %}
+
+{% block content %}
+    <form method="post">
+        <div id="form-content">
+            {% csrf_token %}
+            {{ form|crispy }}
+        </div>
+        <button class="btn btn-primary" type="submit">{% trans "Update" %}</button>
+    </form>
+{% endblock content %}
+
--- a/apps/participation/templates/participation/send_participation_form.html
+++ b/apps/participation/templates/participation/send_participation_form.html
@@ -0,0 +1,14 @@
+{% extends "base.html" %}
+
+{% load crispy_forms_filters i18n %}
+
+{% block content %}
+    <form method="post">
+        <div id="form-content">
+            {% csrf_token %}
+            {{ form|crispy }}
+        </div>
+        <button class="btn btn-primary" type="submit">{% trans "Update" %}</button>
+    </form>
+{% endblock content %}
+
--- a/apps/participation/templates/participation/team_detail.html
+++ b/apps/participation/templates/participation/team_detail.html
@@ -0,0 +1,148 @@
+{% extends "base.html" %}
+
+{% load i18n %}
+{% load crispy_forms_filters %}
+
+{% block content %}
+
+    <div class="card bg-light shadow">
+        <div class="card-header text-center">
+            <h4>{{ team.name }}</h4>
+        </div>
+    <div class="card-body">
+        <dl class="row">
+            <dt class="col-sm-6 text-right">{% trans "Name:" %}</dt>
+            <dd class="col-sm-6">{{ team.name }}</dd>
+
+            <dt class="col-sm-6 text-right">{% trans "Trigram:" %}</dt>
+            <dd class="col-sm-6">{{ team.trigram }}</dd>
+
+            <dt class="col-sm-6 text-right">{% trans "Email:" %}</dt>
+            <dd class="col-sm-6"><a href="mailto:{{ team.email }}">{{ team.email }}</a></dd>
+
+            <dt class="col-sm-6 text-right">{% trans "Access code:" %}</dt>
+            <dd class="col-sm-6">{{ team.access_code }}</dd>
+
+            <dt class="col-sm-6 text-right">{% trans "Coachs:" %}</dt>
+            <dd class="col-sm-6">
+                {% for coach in team.coachs.all %}
+                    <a href="{% url "registration:user_detail" pk=coach.user.pk %}">{{ coach }}</a>{% if not forloop.last %},{% endif %}
+                {% empty %}
+                    {% trans "any" %}
+                {% endfor %}
+            </dd>
+
+            <dt class="col-sm-6 text-right">{% trans "Participants:" %}</dt>
+            <dd class="col-sm-6">
+                {% for student in team.students.all %}
+                    <a href="{% url "registration:user_detail" pk=student.user.pk %}">{{ student }}</a>{% if not forloop.last %},{% endif %}
+                {% empty %}
+                    {% trans "any" %}
+                {% endfor %}
+            </dd>
+
+            <dt class="col-sm-6 text-right">{% trans "Chosen problem:" %}</dt>
+            {% trans "any" as any %}
+            <dd class="col-sm-6">{{ team.participation.get_problem_display|default:any }}</dd>
+
+            <dt class="col-sm-6 text-right">{% trans "Grant Animath to publish our video:" %}</dt>
+            <dd class="col-sm-6">{{ team.grant_animath_access_videos|yesno }}</dd>
+
+            <dt class="col-sm-6 text-right">{% trans "Authorizations:" %}</dt>
+            <dd class="col-sm-6">
+                {% for student in team.students.all %}
+                    {% if student.photo_authorization %}
+                        <a href="{{ student.photo_authorization.url }}" data-turbolinks="false">{{ student }}</a>{% if not forloop.last %},{% endif %}
+                    {% else %}
+                        {{ student }} ({% trans "Not uploaded yet" %}){% if not forloop.last %},{% endif %}
+                    {% endif %}
+                {% endfor %}
+            </dd>
+        </dl>
+    </div>
+    <div class="card-footer text-center">
+        <button class="btn btn-primary" data-toggle="modal" data-target="#updateTeamModal">{% trans "Update" %}</button>
+        {% if not team.participation.valid %}
+            <button class="btn btn-danger" data-toggle="modal" data-target="#leaveTeamModal">{% trans "Leave" %}</button>
+        {% endif %}
+    </div>
+    </div>
+
+    <hr>
+
+    {% if team.participation.valid %}
+        <div class="text-center">
+            <a class="btn btn-info" href="{% url "participation:participation_detail" pk=team.participation.pk %}">
+                <i class="fas fa-video"></i> {% trans "Access to team participation" %} <i class="fas fa-video"></i>
+            </a>
+        </div>
+    {% elif team.participation.valid == None %} {# Team did not ask for validation #}
+        {% if user.registration.participates %}
+            {% if can_validate %}
+                <div class="alert alert-info">
+                    {% trans "Your team has at least 3 members and all photo authorizations were given: the team can be validated." %}
+                    <div class="text-center">
+                        <form method="post">
+                            {% csrf_token %}
+                            {{ request_validation_form|crispy }}
+                            <button class="btn btn-success" name="request-validation">{% trans "Submit my team to validation" %}</button>
+                        </form>
+                    </div>
+                </div>
+            {% else %}
+                <div class="alert alert-warning">
+                    {% trans "Your team must be composed of 3 members and each member must upload its photo authorization and confirm its email address." %}
+                </div>
+            {% endif %}
+        {% else %}
+            <div class="alert alert-warning">
+            {% trans "This team didn't ask for validation yet." %}
+            </div>
+        {% endif %}
+    {% else %}  {# Team is waiting for validation #}
+        {% if user.registration.participates %}
+            <div class="alert alert-warning">
+                {% trans "Your validation is pending." %}
+            </div>
+        {% else %}
+            <div class="alert alert-info">
+                {% trans "The team requested to be validated. You may now control the authorizations and confirm that they can participate." %}
+            </div>
+             <form method="post">
+                {% csrf_token %}
+                {{ validation_form|crispy }}
+                <div class="input-group btn-group">
+                    <button class="btn btn-success" name="validate" type="submit">{% trans "Validate" %}</button>
+                    <button class="btn btn-danger" name="invalidate" type="submit">{% trans "Invalidate" %}</button>
+                </div>
+             </form>
+        {% endif %}
+    {% endif %}
+
+    {% trans "Update team" as modal_title %}
+    {% trans "Update" as modal_button %}
+    {% url "participation:update_team" pk=team.pk as modal_action %}
+    {% include "base_modal.html" with modal_id="updateTeam" %}
+
+    {% trans "Leave team" as modal_title %}
+    {% trans "Leave" as modal_button %}
+    {% url "participation:team_leave" as modal_action %}
+    {% include "base_modal.html" with modal_id="leaveTeam" modal_button_type="danger" %}
+{% endblock %}
+
+{% block extrajavascript %}
+    <script>
+        $(document).ready(function() {
+            $('button[data-target="#updateTeamModal"]').click(function() {
+                let modalBody = $("#updateTeamModal div.modal-body");
+                if (!modalBody.html().trim())
+                    modalBody.load("{% url "participation:update_team" pk=team.pk %} #form-content");
+            });
+            $('button[data-target="#leaveTeamModal"]').click(function() {
+                let modalBody = $("#leaveTeamModal div.modal-body");
+                if (!modalBody.html().trim())
+                    modalBody.load("{% url "participation:team_leave" %} #form-content");
+            });
+        });
+    </script>
+{% endblock %}
--- a/apps/participation/templates/participation/team_leave.html
+++ b/apps/participation/templates/participation/team_leave.html
@@ -0,0 +1,13 @@
+{% extends "base.html" %}
+
+{% load i18n %}
+
+{% block content %}
+    <form method="post">
+        <div class="alert alert-warning" id="form-content">
+            {% csrf_token %}
+            {% trans "Are you sure that you want to leave this team?" %}
+        </div>
+        <button class="btn btn-danger" type="submit">{% trans "Leave" %}</button>
+    </form>
+{% endblock %}
--- a/apps/participation/templates/participation/team_list.html
+++ b/apps/participation/templates/participation/team_list.html
@@ -0,0 +1,13 @@
+{% extends "base.html" %}
+
+{% load django_tables2 i18n %}
+
+{% block contenttitle %}
+    <h1>{% trans "All teams" %}</h1>
+{% endblock %}
+
+{% block content %}
+    <div id="form-content">
+        {% render_table table %}
+    </div>
+{% endblock %}
--- a/apps/participation/templates/participation/update_team.html
+++ b/apps/participation/templates/participation/update_team.html
@@ -0,0 +1,15 @@
+{% extends "base.html" %}
+
+{% load crispy_forms_filters i18n %}
+
+{% block content %}
+    <form method="post">
+        <div id="form-content">
+            {% csrf_token %}
+            {{ form|crispy }}
+            {{ participation_form|crispy }}
+        </div>
+        <button class="btn btn-success" type="submit">{% trans "Update" %}</button>
+    </form>
+{% endblock content %}
+
--- a/apps/participation/templates/participation/upload_video.html
+++ b/apps/participation/templates/participation/upload_video.html
@@ -0,0 +1,14 @@
+{% extends "base.html" %}
+
+{% load crispy_forms_filters i18n %}
+
+{% block content %}
+    <form method="post">
+        <div id="form-content">
+            {% csrf_token %}
+            {{ form|crispy }}
+        </div>
+        <button class="btn btn-success" type="submit">{% trans "Upload" %}</button>
+    </form>
+{% endblock content %}
+
--- a/apps/participation/templates/participation/youtube_iframe.html
+++ b/apps/participation/templates/participation/youtube_iframe.html
@@ -0,0 +1,8 @@
+<div style="position: relative; width: 100%; padding-bottom: 56.25%;">
+    <iframe src="https://www.youtube.com/embed/{{ youtube_code }}"
+            frameborder="0"
+            style="position: absolute; top: 0; left: 0; width: 100%; height: 100%;"
+            allow="accelerometer; autoplay; clipboard-write; encrypted-media; gyroscope; picture-in-picture"
+            allowfullscreen>
+    </iframe>
+</div>
--- a/apps/participation/templates/search/indexes/participation/participation_text.txt
+++ b/apps/participation/templates/search/indexes/participation/participation_text.txt
@@ -0,0 +1,4 @@
+{{ object.team.name }}
+{{ object.team.trigram }}
+{{ object.problem }}
+{{ object.get_problem_display }}
--- a/apps/participation/templates/search/indexes/participation/team_text.txt
+++ b/apps/participation/templates/search/indexes/participation/team_text.txt
@@ -0,0 +1,2 @@
+{{ object.name }}
+{{ object.trigram }}
--- a/apps/participation/templates/search/indexes/participation/video_text.txt
+++ b/apps/participation/templates/search/indexes/participation/video_text.txt
@@ -0,0 +1,5 @@
+{{ object.link }}
+{{ object.participation.team.name }}
+{{ object.participation.team.trigram }}
+{{ object.participation.problem }}
+{{ object.participation.get_problem_display }}
--- a/apps/participation/templatetags/init.py
+++ b/apps/participation/templatetags/init.py
@@ -0,0 +1,2 @@
+# Copyright (C) 2020 by Animath
+# SPDX-License-Identifier: GPL-3.0-or-later
--- a/apps/participation/templatetags/calendar.py
+++ b/apps/participation/templatetags/calendar.py
@@ -0,0 +1,15 @@
+# Copyright (C) 2020 by Animath
+# SPDX-License-Identifier: GPL-3.0-or-later
+
+from django import template
+
+from ..models import Phase
+
+
+def current_phase(nb):
+    phase = Phase.current_phase()
+    return phase is not None and phase.phase_number == nb
+
+
+register = template.Library()
+register.filter("current_phase", current_phase)
--- a/apps/participation/tests.py
+++ b/apps/participation/tests.py
@@ -0,0 +1,853 @@
+# Copyright (C) 2020 by Animath
+# SPDX-License-Identifier: GPL-3.0-or-later
+
+from datetime import timedelta
+
+from django.contrib.auth.models import User
+from django.contrib.contenttypes.models import ContentType
+from django.contrib.sites.models import Site
+from django.core.management import call_command
+from django.test import TestCase
+from django.urls import reverse
+from django.utils import timezone
+from registration.models import CoachRegistration, StudentRegistration
+
+from .models import Participation, Phase, Question, Team
+
+
+class TestStudentParticipation(TestCase):
+    def setUp(self) -> None:
+        self.superuser = User.objects.create_superuser(
+            username="admin",
+            email="admin@example.com",
+            password="toto1234",
+        )
+
+        self.user = User.objects.create(
+            first_name="Toto",
+            last_name="Toto",
+            email="toto@example.com",
+            password="toto",
+        )
+        StudentRegistration.objects.create(
+            user=self.user,
+            student_class=12,
+            school="Earth",
+            give_contact_to_animath=True,
+            email_confirmed=True,
+        )
+        self.team = Team.objects.create(
+            name="Super team",
+            trigram="AAA",
+            access_code="azerty",
+            grant_animath_access_videos=True,
+        )
+        self.question = Question.objects.create(participation=self.team.participation,
+                                                question="Pourquoi l'existence précède l'essence ?")
+        self.client.force_login(self.user)
+
+        self.second_user = User.objects.create(
+            first_name="Lalala",
+            last_name="Lalala",
+            email="lalala@example.com",
+            password="lalala",
+        )
+        StudentRegistration.objects.create(
+            user=self.second_user,
+            student_class=11,
+            school="Moon",
+            give_contact_to_animath=True,
+            email_confirmed=True,
+        )
+        self.second_team = Team.objects.create(
+            name="Poor team",
+            trigram="FFF",
+            access_code="qwerty",
+            grant_animath_access_videos=True,
+        )
+
+        self.coach = User.objects.create(
+            first_name="Coach",
+            last_name="Coach",
+            email="coach@example.com",
+            password="coach",
+        )
+        CoachRegistration.objects.create(user=self.coach)
+
+    def test_admin_pages(self):
+        """
+        Load Django-admin pages.
+        """
+        self.client.force_login(self.superuser)
+
+        # Test team pages
+        response = self.client.get(reverse("admin:index") + "participation/team/")
+        self.assertEqual(response.status_code, 200)
+
+        response = self.client.get(reverse("admin:index")
+                                   + f"participation/team/{self.team.pk}/change/")
+        self.assertEqual(response.status_code, 200)
+        response = self.client.get(reverse("admin:index") +
+                                   f"r/{ContentType.objects.get_for_model(Team).id}/"
+                                   f"{self.team.pk}/")
+        self.assertRedirects(response, "http://" + Site.objects.get().domain +
+                             str(self.team.get_absolute_url()), 302, 200)
+
+        # Test participation pages
+        self.team.participation.valid = True
+        self.team.participation.save()
+        response = self.client.get(reverse("admin:index") + "participation/participation/")
+        self.assertEqual(response.status_code, 200)
+
+        response = self.client.get(reverse("admin:index")
+                                   + f"participation/participation/{self.team.participation.pk}/change/")
+        self.assertEqual(response.status_code, 200)
+        response = self.client.get(reverse("admin:index") +
+                                   f"r/{ContentType.objects.get_for_model(Participation).id}/"
+                                   f"{self.team.participation.pk}/")
+        self.assertRedirects(response, "http://" + Site.objects.get().domain +
+                             str(self.team.participation.get_absolute_url()), 302, 200)
+
+        # Test video pages
+        response = self.client.get(reverse("admin:index") + "participation/video/")
+        self.assertEqual(response.status_code, 200)
+
+        response = self.client.get(reverse("admin:index")
+                                   + f"participation/video/{self.team.participation.solution.pk}/change/")
+        self.assertEqual(response.status_code, 200)
+
+        # Test question pages
+        response = self.client.get(reverse("admin:index") + "participation/question/")
+        self.assertEqual(response.status_code, 200)
+
+        response = self.client.get(reverse("admin:index")
+                                   + f"participation/question/{self.question.pk}/change/")
+        self.assertEqual(response.status_code, 200)
+
+        # Test phase pages
+        response = self.client.get(reverse("admin:index") + "participation/phase/")
+        self.assertEqual(response.status_code, 200)
+
+        response = self.client.get(reverse("admin:index") + "participation/phase/1/change/")
+        self.assertEqual(response.status_code, 200)
+
+    def test_create_team(self):
+        """
+        Try to create a team.
+        """
+        response = self.client.get(reverse("participation:create_team"))
+        self.assertEqual(response.status_code, 200)
+
+        response = self.client.post(reverse("participation:create_team"), data=dict(
+            name="Test team",
+            trigram="123",
+            grant_animath_access_videos=False,
+        ))
+        self.assertEqual(response.status_code, 200)
+
+        response = self.client.post(reverse("participation:create_team"), data=dict(
+            name="Test team",
+            trigram="TES",
+            grant_animath_access_videos=False,
+        ))
+        self.assertTrue(Team.objects.filter(trigram="TES").exists())
+        team = Team.objects.get(trigram="TES")
+        self.assertRedirects(response, reverse("participation:team_detail", args=(team.pk,)), 302, 200)
+
+        # Already in a team
+        response = self.client.post(reverse("participation:create_team"), data=dict(
+            name="Test team 2",
+            trigram="TET",
+            grant_animath_access_videos=False,
+        ))
+        self.assertEqual(response.status_code, 403)
+
+    def test_join_team(self):
+        """
+        Try to join an existing team.
+        """
+        response = self.client.get(reverse("participation:join_team"))
+        self.assertEqual(response.status_code, 200)
+
+        team = Team.objects.create(name="Test", trigram="TES")
+
+        response = self.client.post(reverse("participation:join_team"), data=dict(
+            access_code="éééééé",
+        ))
+        self.assertEqual(response.status_code, 200)
+
+        response = self.client.post(reverse("participation:join_team"), data=dict(
+            access_code=team.access_code,
+        ))
+        self.assertRedirects(response, reverse("participation:team_detail", args=(team.pk,)), 302, 200)
+        self.assertTrue(Team.objects.filter(trigram="TES").exists())
+
+        # Already joined
+        response = self.client.post(reverse("participation:join_team"), data=dict(
+            access_code=team.access_code,
+        ))
+        self.assertEqual(response.status_code, 403)
+
+    def test_team_list(self):
+        """
+        Test to display the list of teams.
+        """
+        response = self.client.get(reverse("participation:team_list"))
+        self.assertTrue(response.status_code, 200)
+
+    def test_no_myteam_redirect_noteam(self):
+        """
+        Test redirection.
+        """
+        response = self.client.get(reverse("participation:my_team_detail"))
+        self.assertTrue(response.status_code, 200)
+
+    def test_team_detail(self):
+        """
+        Try to display the information of a team.
+        """
+        self.user.registration.team = self.team
+        self.user.registration.save()
+
+        response = self.client.get(reverse("participation:my_team_detail"))
+        self.assertRedirects(response, reverse("participation:team_detail", args=(self.team.pk,)), 302, 200)
+
+        response = self.client.get(reverse("participation:team_detail", args=(self.team.pk,)))
+        self.assertEqual(response.status_code, 200)
+
+        # Can't see other teams
+        self.second_user.registration.team = self.second_team
+        self.second_user.registration.save()
+        self.client.force_login(self.second_user)
+        response = self.client.get(reverse("participation:team_detail", args=(self.team.participation.pk,)))
+        self.assertEqual(response.status_code, 403)
+
+    def test_request_validate_team(self):
+        """
+        The team ask for validation.
+        """
+        self.user.registration.team = self.team
+        self.user.registration.save()
+
+        second_user = User.objects.create(
+            first_name="Blublu",
+            last_name="Blublu",
+            email="blublu@example.com",
+            password="blublu",
+        )
+        StudentRegistration.objects.create(
+            user=second_user,
+            student_class=12,
+            school="Jupiter",
+            give_contact_to_animath=True,
+            email_confirmed=True,
+            team=self.team,
+            photo_authorization="authorization/photo/mai-linh",
+        )
+
+        third_user = User.objects.create(
+            first_name="Zupzup",
+            last_name="Zupzup",
+            email="zupzup@example.com",
+            password="zupzup",
+        )
+        StudentRegistration.objects.create(
+            user=third_user,
+            student_class=10,
+            school="Sun",
+            give_contact_to_animath=False,
+            email_confirmed=True,
+            team=self.team,
+            photo_authorization="authorization/photo/yohann",
+        )
+
+        self.client.force_login(self.superuser)
+        # Admin users can't ask for validation
+        resp = self.client.post(reverse("participation:team_detail", args=(self.team.pk,)), data=dict(
+            _form_type="RequestValidationForm",
+            engagement=True,
+        ))
+        self.assertEqual(resp.status_code, 200)
+
+        self.client.force_login(self.user)
+
+        self.assertIsNone(self.team.participation.valid)
+
+        resp = self.client.get(reverse("participation:team_detail", args=(self.team.pk,)))
+        self.assertEqual(resp.status_code, 200)
+        self.assertFalse(resp.context["can_validate"])
+        # Can't validate
+        resp = self.client.post(reverse("participation:team_detail", args=(self.team.pk,)), data=dict(
+            _form_type="RequestValidationForm",
+            engagement=True,
+        ))
+        self.assertEqual(resp.status_code, 200)
+
+        self.user.registration.photo_authorization = "authorization/photo/ananas"
+        self.user.registration.save()
+
+        resp = self.client.get(reverse("participation:team_detail", args=(self.team.pk,)))
+        self.assertEqual(resp.status_code, 200)
+        self.assertFalse(resp.context["can_validate"])
+
+        self.team.participation.problem = 2
+        self.team.participation.save()
+
+        resp = self.client.get(reverse("participation:team_detail", args=(self.team.pk,)))
+        self.assertEqual(resp.status_code, 200)
+        self.assertTrue(resp.context["can_validate"])
+
+        resp = self.client.post(reverse("participation:team_detail", args=(self.team.pk,)), data=dict(
+            _form_type="RequestValidationForm",
+            engagement=True,
+        ))
+        self.assertRedirects(resp, reverse("participation:team_detail", args=(self.team.pk,)), 302, 200)
+        self.team.participation.refresh_from_db()
+        self.assertFalse(self.team.participation.valid)
+        self.assertIsNotNone(self.team.participation.valid)
+
+        # Team already asked for validation
+        resp = self.client.post(reverse("participation:team_detail", args=(self.team.pk,)), data=dict(
+            _form_type="RequestValidationForm",
+            engagement=True,
+        ))
+        self.assertEqual(resp.status_code, 200)
+
+    def test_validate_team(self):
+        """
+        A team asked for validation. Try to validate it.
+        """
+        self.team.participation.valid = False
+        self.team.participation.save()
+
+        # No right to do that
+        resp = self.client.post(reverse("participation:team_detail", args=(self.team.pk,)), data=dict(
+            _form_type="ValidateParticipationForm",
+            message="J'ai 4 ans",
+            validate=True,
+        ))
+        self.assertEqual(resp.status_code, 200)
+
+        self.client.force_login(self.superuser)
+
+        resp = self.client.get(reverse("participation:team_detail", args=(self.team.pk,)))
+        self.assertEqual(resp.status_code, 200)
+
+        resp = self.client.post(reverse("participation:team_detail", args=(self.team.pk,)), data=dict(
+            _form_type="ValidateParticipationForm",
+            message="Woops I didn't said anything",
+        ))
+        self.assertEqual(resp.status_code, 200)
+
+        # Test invalidate team
+        resp = self.client.post(reverse("participation:team_detail", args=(self.team.pk,)), data=dict(
+            _form_type="ValidateParticipationForm",
+            message="Wsh nope",
+            invalidate=True,
+        ))
+        self.assertRedirects(resp, reverse("participation:team_detail", args=(self.team.pk,)), 302, 200)
+        self.team.participation.refresh_from_db()
+        self.assertIsNone(self.team.participation.valid)
+
+        # Team did not ask validation
+        resp = self.client.post(reverse("participation:team_detail", args=(self.team.pk,)), data=dict(
+            _form_type="ValidateParticipationForm",
+            message="Bienvenue ça va être trop cool",
+            validate=True,
+        ))
+        self.assertEqual(resp.status_code, 200)
+
+        self.team.participation.valid = False
+        self.team.participation.save()
+
+        # Test validate team
+        resp = self.client.post(reverse("participation:team_detail", args=(self.team.pk,)), data=dict(
+            _form_type="ValidateParticipationForm",
+            message="Bienvenue ça va être trop cool",
+            validate=True,
+        ))
+        self.assertRedirects(resp, reverse("participation:team_detail", args=(self.team.pk,)), 302, 200)
+        self.team.participation.refresh_from_db()
+        self.assertTrue(self.team.participation.valid)
+
+    def test_update_team(self):
+        """
+        Try to update team information.
+        """
+        self.user.registration.team = self.team
+        self.user.registration.save()
+
+        self.coach.registration.team = self.team
+        self.coach.registration.save()
+
+        response = self.client.get(reverse("participation:update_team", args=(self.team.pk,)))
+        self.assertEqual(response.status_code, 200)
+
+        # Form is invalid
+        response = self.client.post(reverse("participation:update_team", args=(self.team.pk,)), data=dict(
+            name="Updated team name",
+            trigram="BBB",
+            grant_animath_access_videos=True,
+            problem=42,
+        ))
+        self.assertEqual(response.status_code, 200)
+
+        response = self.client.post(reverse("participation:update_team", args=(self.team.pk,)), data=dict(
+            name="Updated team name",
+            trigram="BBB",
+            grant_animath_access_videos=True,
+            problem=3,
+        ))
+        self.assertRedirects(response, reverse("participation:team_detail", args=(self.team.pk,)), 302, 200)
+        self.assertTrue(Team.objects.filter(trigram="BBB", participation__problem=3).exists())
+
+    def test_leave_team(self):
+        """
+        A user is in a team, and leaves it.
+        """
+        # User is not in a team
+        response = self.client.post(reverse("participation:team_leave"))
+        self.assertEqual(response.status_code, 403)
+
+        self.user.registration.team = self.team
+        self.user.registration.save()
+
+        # Team is valid
+        self.team.participation.valid = True
+        self.team.participation.save()
+        response = self.client.post(reverse("participation:team_leave"))
+        self.assertEqual(response.status_code, 403)
+
+        # Unauthenticated users are redirected to login page
+        self.client.logout()
+        response = self.client.get(reverse("participation:team_leave"))
+        self.assertRedirects(response, reverse("login") + "?next=" + reverse("participation:team_leave"), 302, 200)
+
+        self.client.force_login(self.user)
+
+        self.team.participation.valid = None
+        self.team.participation.save()
+
+        response = self.client.post(reverse("participation:team_leave"))
+        self.assertRedirects(response, reverse("index"), 302, 200)
+        self.user.registration.refresh_from_db()
+        self.assertIsNone(self.user.registration.team)
+        self.assertFalse(Team.objects.filter(pk=self.team.pk).exists())
+
+    def test_no_myparticipation_redirect_nomyparticipation(self):
+        """
+        Ensure a permission denied when we search my team participation when we are in no team.
+        """
+        response = self.client.get(reverse("participation:my_participation_detail"))
+        self.assertEqual(response.status_code, 403)
+
+    def test_participation_detail(self):
+        """
+        Try to display the detail of a team participation.
+        """
+        self.user.registration.team = self.team
+        self.user.registration.save()
+
+        # Can't see the participation if it is not valid
+        response = self.client.get(reverse("participation:my_participation_detail"))
+        self.assertRedirects(response,
+                             reverse("participation:participation_detail", args=(self.team.participation.pk,)),
+                             302, 403)
+
+        self.team.participation.valid = True
+        self.team.participation.save()
+        response = self.client.get(reverse("participation:my_participation_detail"))
+        self.assertRedirects(response,
+                             reverse("participation:participation_detail", args=(self.team.participation.pk,)),
+                             302, 200)
+
+        response = self.client.get(reverse("participation:participation_detail", args=(self.team.participation.pk,)))
+        self.assertEqual(response.status_code, 200)
+
+        # Can't see other participations
+        self.second_user.registration.team = self.second_team
+        self.second_user.registration.save()
+        self.client.force_login(self.second_user)
+        response = self.client.get(reverse("participation:participation_detail", args=(self.team.participation.pk,)))
+        self.assertEqual(response.status_code, 403)
+
+    def test_upload_video(self):
+        """
+        Try to send a solution video link.
+        """
+        self.user.registration.team = self.team
+        self.user.registration.save()
+
+        self.team.participation.valid = True
+        self.team.participation.save()
+
+        response = self.client.get(reverse("participation:upload_video", args=(self.team.participation.solution.pk,)))
+        self.assertEqual(response.status_code, 200)
+
+        response = self.client.post(reverse("participation:upload_video", args=(self.team.participation.solution.pk,)),
+                                    data=dict(link="https://youtube.com/watch?v=73nsrixx7eI"))
+        self.assertRedirects(response,
+                             reverse("participation:participation_detail", args=(self.team.participation.id,)),
+                             302, 200)
+        self.team.participation.refresh_from_db()
+        self.assertEqual(self.team.participation.solution.platform, "youtube")
+        self.assertEqual(self.team.participation.solution.youtube_code, "73nsrixx7eI")
+
+        response = self.client.get(reverse("participation:participation_detail", args=(self.team.participation.pk,)))
+        self.assertEqual(response.status_code, 200)
+
+        # Set the second phase
+        for i in range(1, 5):
+            Phase.objects.filter(phase_number=i).update(start=timezone.now() + timedelta(days=i - 2),
+                                                        end=timezone.now() + timedelta(days=i - 1))
+        self.assertEqual(Phase.current_phase().phase_number, 2)
+
+        # Can't update the link during the second phase
+        response = self.client.post(reverse("participation:upload_video", args=(self.team.participation.solution.pk,)),
+                                    data=dict(link="https://youtube.com/watch?v=73nsrixx7eI"))
+        self.assertEqual(response.status_code, 200)
+
+    def test_questions(self):
+        """
+        Ensure that creating/updating/deleting a question is working.
+        """
+        self.user.registration.team = self.team
+        self.user.registration.save()
+
+        self.team.participation.valid = True
+        self.team.participation.save()
+
+        response = self.client.get(reverse("participation:add_question", args=(self.team.participation.pk,)))
+        self.assertEqual(response.status_code, 200)
+
+        # We are not in second phase
+        response = self.client.post(reverse("participation:add_question", args=(self.team.participation.pk,)),
+                                    data=dict(question="I got censored!"))
+        self.assertEqual(response.status_code, 200)
+
+        # Set the second phase
+        for i in range(1, 5):
+            Phase.objects.filter(phase_number=i).update(start=timezone.now() + timedelta(days=i - 2),
+                                                        end=timezone.now() + timedelta(days=i - 1))
+        self.assertEqual(Phase.current_phase().phase_number, 2)
+
+        # Create a question
+        response = self.client.post(reverse("participation:add_question", args=(self.team.participation.pk,)),
+                                    data=dict(question="I asked a question!"))
+        self.assertRedirects(response, reverse("participation:participation_detail",
+                                               args=(self.team.participation.pk,)), 302, 200)
+        qs = Question.objects.filter(participation=self.team.participation, question="I asked a question!")
+        self.assertTrue(qs.exists())
+        question = qs.get()
+
+        # Update a question
+        response = self.client.get(reverse("participation:update_question", args=(question.pk,)))
+        self.assertEqual(response.status_code, 200)
+        response = self.client.post(reverse("participation:update_question", args=(question.pk,)), data=dict(
+            question="The question changed!",
+        ))
+        self.assertRedirects(response, reverse("participation:participation_detail",
+                                               args=(self.team.participation.pk,)), 302, 200)
+        question.refresh_from_db()
+        self.assertEqual(question.question, "The question changed!")
+
+        # Delete the question
+        response = self.client.get(reverse("participation:delete_question", args=(question.pk,)))
+        self.assertEqual(response.status_code, 200)
+        response = self.client.post(reverse("participation:delete_question", args=(question.pk,)))
+        self.assertRedirects(response, reverse("participation:participation_detail",
+                                               args=(self.team.participation.pk,)), 302, 200)
+        self.assertFalse(Question.objects.filter(pk=question.pk).exists())
+
+        # Non-authenticated users are redirected to login page
+        self.client.logout()
+        response = self.client.get(reverse("participation:add_question", args=(self.team.participation.pk,)))
+        self.assertRedirects(response, reverse("login") + "?next=" +
+                             reverse("participation:add_question", args=(self.team.participation.pk,)), 302, 200)
+        response = self.client.get(reverse("participation:update_question", args=(self.question.pk,)))
+        self.assertRedirects(response, reverse("login") + "?next=" +
+                             reverse("participation:update_question", args=(self.question.pk,)), 302, 200)
+        response = self.client.get(reverse("participation:delete_question", args=(self.question.pk,)))
+        self.assertRedirects(response, reverse("login") + "?next=" +
+                             reverse("participation:delete_question", args=(self.question.pk,)), 302, 200)
+
+    def test_current_phase(self):
+        """
+        Ensure that the current phase is the good one.
+        """
+        # We are before the beginning
+        for i in range(1, 5):
+            Phase.objects.filter(phase_number=i).update(start=timezone.now() + timedelta(days=2 * i),
+                                                        end=timezone.now() + timedelta(days=2 * i + 1))
+        self.assertEqual(Phase.current_phase(), None)
+
+        # We are after the end
+        for i in range(1, 5):
+            Phase.objects.filter(phase_number=i).update(start=timezone.now() - timedelta(days=2 * i),
+                                                        end=timezone.now() - timedelta(days=2 * i + 1))
+        self.assertEqual(Phase.current_phase().phase_number, Phase.objects.count())
+
+        # First phase
+        for i in range(1, 5):
+            Phase.objects.filter(phase_number=i).update(start=timezone.now() + timedelta(days=i - 1),
+                                                        end=timezone.now() + timedelta(days=i))
+        self.assertEqual(Phase.current_phase().phase_number, 1)
+
+        # Second phase
+        for i in range(1, 5):
+            Phase.objects.filter(phase_number=i).update(start=timezone.now() + timedelta(days=i - 2),
+                                                        end=timezone.now() + timedelta(days=i - 1))
+        self.assertEqual(Phase.current_phase().phase_number, 2)
+
+        # Third phase
+        for i in range(1, 5):
+            Phase.objects.filter(phase_number=i).update(start=timezone.now() + timedelta(days=i - 3),
+                                                        end=timezone.now() + timedelta(days=i - 2))
+        self.assertEqual(Phase.current_phase().phase_number, 3)
+
+        # Fourth phase
+        for i in range(1, 5):
+            Phase.objects.filter(phase_number=i).update(start=timezone.now() + timedelta(days=i - 4),
+                                                        end=timezone.now() + timedelta(days=i - 3))
+        self.assertEqual(Phase.current_phase().phase_number, 4)
+
+        response = self.client.get(reverse("participation:calendar"))
+        self.assertEqual(response.status_code, 200)
+
+        response = self.client.get(reverse("participation:update_phase", args=(4,)))
+        self.assertEqual(response.status_code, 403)
+
+        response = self.client.post(reverse("participation:update_phase", args=(4,)), data=dict(
+            start=timezone.now(),
+            end=timezone.now() + timedelta(days=3),
+        ))
+        self.assertEqual(response.status_code, 403)
+
+        self.client.force_login(self.superuser)
+        response = self.client.get(reverse("participation:update_phase", args=(4,)))
+        self.assertEqual(response.status_code, 200)
+
+        response = self.client.post(reverse("participation:update_phase", args=(4,)), data=dict(
+            start=timezone.now(),
+            end=timezone.now() + timedelta(days=3),
+        ))
+        self.assertRedirects(response, reverse("participation:calendar"), 302, 200)
+        fourth_phase = Phase.objects.get(phase_number=4)
+        self.assertEqual((fourth_phase.end - fourth_phase.start).days, 3)
+
+        # First phase must be before the other phases
+        response = self.client.post(reverse("participation:update_phase", args=(1,)), data=dict(
+            start=timezone.now() + timedelta(days=8),
+            end=timezone.now() + timedelta(days=9),
+        ))
+        self.assertEqual(response.status_code, 200)
+
+        # Fourth phase must be after the other phases
+        response = self.client.post(reverse("participation:update_phase", args=(4,)), data=dict(
+            start=timezone.now() - timedelta(days=9),
+            end=timezone.now() - timedelta(days=8),
+        ))
+        self.assertEqual(response.status_code, 200)
+
+        # End must be after start
+        response = self.client.post(reverse("participation:update_phase", args=(4,)), data=dict(
+            start=timezone.now() + timedelta(days=3),
+            end=timezone.now(),
+        ))
+        self.assertEqual(response.status_code, 200)
+
+        # Unauthenticated user can't update the calendar
+        self.client.logout()
+        response = self.client.get(reverse("participation:calendar"))
+        self.assertEqual(response.status_code, 200)
+        response = self.client.get(reverse("participation:update_phase", args=(2,)))
+        self.assertRedirects(response, reverse("login") + "?next=" +
+                             reverse("participation:update_phase", args=(2,)), 302, 200)
+
+    def test_forbidden_access(self):
+        """
+        Load personal pages and ensure that these are protected.
+        """
+        self.user.registration.team = self.team
+        self.user.registration.save()
+
+        resp = self.client.get(reverse("participation:team_detail", args=(self.second_team.pk,)))
+        self.assertEqual(resp.status_code, 403)
+        resp = self.client.get(reverse("participation:update_team", args=(self.second_team.pk,)))
+        self.assertEqual(resp.status_code, 403)
+        resp = self.client.get(reverse("participation:team_authorizations", args=(self.second_team.pk,)))
+        self.assertEqual(resp.status_code, 403)
+        resp = self.client.get(reverse("participation:participation_detail", args=(self.second_team.pk,)))
+        self.assertEqual(resp.status_code, 403)
+        resp = self.client.get(reverse("participation:upload_video",
+                                       args=(self.second_team.participation.solution.pk,)))
+        self.assertEqual(resp.status_code, 403)
+        resp = self.client.get(reverse("participation:upload_video",
+                                       args=(self.second_team.participation.synthesis.pk,)))
+        self.assertEqual(resp.status_code, 403)
+        resp = self.client.get(reverse("participation:add_question", args=(self.second_team.pk,)))
+        self.assertEqual(resp.status_code, 403)
+        question = Question.objects.create(participation=self.second_team.participation,
+                                           question=self.question.question)
+        resp = self.client.get(reverse("participation:update_question", args=(question.pk,)))
+        self.assertEqual(resp.status_code, 403)
+        resp = self.client.get(reverse("participation:delete_question", args=(question.pk,)))
+        self.assertEqual(resp.status_code, 403)
+
+    def test_cover_matrix(self):
+        """
+        Load matrix scripts, to cover them and ensure that they can run.
+        """
+        self.user.registration.team = self.team
+        self.user.registration.save()
+        self.second_user.registration.team = self.second_team
+        self.second_user.registration.save()
+        self.team.participation.valid = True
+        self.team.participation.received_participation = self.second_team.participation
+        self.team.participation.save()
+
+        call_command('fix_matrix_channels')
+        call_command('setup_third_phase')
+
+
+class TestAdmin(TestCase):
+    def setUp(self) -> None:
+        self.user = User.objects.create_superuser(
+            username="admin@example.com",
+            email="admin@example.com",
+            password="admin",
+        )
+        self.client.force_login(self.user)
+
+        self.team1 = Team.objects.create(
+            name="Toto",
+            trigram="TOT",
+        )
+        self.team1.participation.valid = True
+        self.team1.participation.problem = 1
+        self.team1.participation.save()
+
+        self.team2 = Team.objects.create(
+            name="Bliblu",
+            trigram="BIU",
+        )
+        self.team2.participation.valid = True
+        self.team2.participation.problem = 1
+        self.team2.participation.save()
+
+        self.team3 = Team.objects.create(
+            name="Zouplop",
+            trigram="ZPL",
+        )
+        self.team3.participation.valid = True
+        self.team3.participation.problem = 1
+        self.team3.participation.save()
+
+        self.other_team = Team.objects.create(
+            name="I am different",
+            trigram="IAD",
+        )
+        self.other_team.participation.valid = True
+        self.other_team.participation.problem = 2
+        self.other_team.participation.save()
+
+    def test_research(self):
+        """
+        Try to search some things.
+        """
+        call_command("rebuild_index", "--noinput", "--verbosity", 0)
+
+        response = self.client.get(reverse("haystack_search") + "?q=" + self.team1.name)
+        self.assertEqual(response.status_code, 200)
+        self.assertTrue(response.context["object_list"])
+
+        response = self.client.get(reverse("haystack_search") + "?q=" + self.team2.trigram)
+        self.assertEqual(response.status_code, 200)
+        self.assertTrue(response.context["object_list"])
+
+    def test_set_received_video(self):
+        """
+        Try to define the received video of a participation.
+        """
+        response = self.client.get(reverse("participation:participation_receive_participation",
+                                           args=(self.team1.participation.pk,)))
+        self.assertEqual(response.status_code, 200)
+
+        response = self.client.post(reverse("participation:participation_receive_participation",
+                                            args=(self.team1.participation.pk,)),
+                                    data=dict(received_participation=self.team2.participation.pk))
+        self.assertRedirects(response, reverse("participation:participation_detail",
+                                               args=(self.team1.participation.pk,)), 302, 200)
+
+        response = self.client.get(reverse("participation:participation_receive_participation",
+                                           args=(self.team1.participation.pk,)))
+        self.assertEqual(response.status_code, 200)
+
+        response = self.client.post(reverse("participation:participation_send_participation",
+                                            args=(self.team1.participation.pk,)),
+                                    data=dict(sent_participation=self.team3.participation.pk))
+        self.assertRedirects(response, reverse("participation:participation_detail",
+                                               args=(self.team1.participation.pk,)), 302, 200)
+
+        self.team1.participation.refresh_from_db()
+        self.team2.participation.refresh_from_db()
+        self.team3.participation.refresh_from_db()
+
+        self.assertEqual(self.team1.participation.received_participation.pk, self.team2.participation.pk)
+        self.assertEqual(self.team1.participation.sent_participation.pk, self.team3.participation.pk)
+        self.assertEqual(self.team2.participation.sent_participation.pk, self.team1.participation.pk)
+        self.assertEqual(self.team3.participation.received_participation.pk, self.team1.participation.pk)
+
+        # The other team didn't work on the same problem
+        response = self.client.post(reverse("participation:participation_receive_participation",
+                                            args=(self.team1.participation.pk,)),
+                                    data=dict(received_participation=self.other_team.participation.pk))
+        self.assertEqual(response.status_code, 200)
+
+        response = self.client.post(reverse("participation:participation_send_participation",
+                                            args=(self.team1.participation.pk,)),
+                                    data=dict(sent_participation=self.other_team.participation.pk))
+        self.assertEqual(response.status_code, 200)
+
+    def test_create_team_forbidden(self):
+        """
+        Ensure that an admin can't create a team.
+        """
+        response = self.client.post(reverse("participation:create_team"), data=dict(
+            name="Test team",
+            trigram="TES",
+            grant_animath_access_videos=False,
+        ))
+        self.assertEqual(response.status_code, 403)
+
+    def test_join_team_forbidden(self):
+        """
+        Ensure that an admin can't join a team.
+        """
+        team = Team.objects.create(name="Test", trigram="TES")
+
+        response = self.client.post(reverse("participation:join_team"), data=dict(
+            access_code=team.access_code,
+        ))
+        self.assertTrue(response.status_code, 403)
+
+    def test_leave_team_forbidden(self):
+        """
+        Ensure that an admin can't leave a team.
+        """
+        response = self.client.get(reverse("participation:team_leave"))
+        self.assertTrue(response.status_code, 403)
+
+    def test_my_team_forbidden(self):
+        """
+        Ensure that an admin can't access to "My team".
+        """
+        response = self.client.get(reverse("participation:my_team_detail"))
+        self.assertEqual(response.status_code, 403)
+
+    def test_my_participation_forbidden(self):
+        """
+        Ensure that an admin can't access to "My participation".
+        """
+        response = self.client.get(reverse("participation:my_participation_detail"))
+        self.assertEqual(response.status_code, 403)
--- a/apps/participation/urls.py
+++ b/apps/participation/urls.py
@@ -0,0 +1,37 @@
+# Copyright (C) 2020 by Animath
+# SPDX-License-Identifier: GPL-3.0-or-later
+
+from django.urls import path
+from django.views.generic import TemplateView
+
+from .views import CalendarView, CreateQuestionView, CreateTeamView, DeleteQuestionView, JoinTeamView, \
+    MyParticipationDetailView, MyTeamDetailView, ParticipationDetailView, PhaseUpdateView, \
+    SetParticipationReceiveParticipationView, SetParticipationSendParticipationView, TeamAuthorizationsView, \
+    TeamDetailView, TeamLeaveView, TeamListView, TeamUpdateView, UpdateQuestionView, UploadVideoView
+
+
+app_name = "participation"
+
+urlpatterns = [
+    path("create_team/", CreateTeamView.as_view(), name="create_team"),
+    path("join_team/", JoinTeamView.as_view(), name="join_team"),
+    path("teams/", TeamListView.as_view(), name="team_list"),
+    path("team/", MyTeamDetailView.as_view(), name="my_team_detail"),
+    path("team/<int:pk>/", TeamDetailView.as_view(), name="team_detail"),
+    path("team/<int:pk>/update/", TeamUpdateView.as_view(), name="update_team"),
+    path("team/<int:pk>/authorizations/", TeamAuthorizationsView.as_view(), name="team_authorizations"),
+    path("team/leave/", TeamLeaveView.as_view(), name="team_leave"),
+    path("detail/", MyParticipationDetailView.as_view(), name="my_participation_detail"),
+    path("detail/<int:pk>/", ParticipationDetailView.as_view(), name="participation_detail"),
+    path("detail/upload-video/<int:pk>/", UploadVideoView.as_view(), name="upload_video"),
+    path("detail/<int:pk>/receive-participation/", SetParticipationReceiveParticipationView.as_view(),
+         name="participation_receive_participation"),
+    path("detail/<int:pk>/send-participation/", SetParticipationSendParticipationView.as_view(),
+         name="participation_send_participation"),
+    path("detail/<int:pk>/add-question/", CreateQuestionView.as_view(), name="add_question"),
+    path("update-question/<int:pk>/", UpdateQuestionView.as_view(), name="update_question"),
+    path("delete-question/<int:pk>/", DeleteQuestionView.as_view(), name="delete_question"),
+    path("calendar/", CalendarView.as_view(), name="calendar"),
+    path("calendar/<int:pk>/", PhaseUpdateView.as_view(), name="update_phase"),
+    path("chat/", TemplateView.as_view(template_name="participation/chat.html"), name="chat")
+]
--- a/apps/participation/views.py
+++ b/apps/participation/views.py
@@ -0,0 +1,546 @@
+# Copyright (C) 2020 by Animath
+# SPDX-License-Identifier: GPL-3.0-or-later
+
+from io import BytesIO
+from zipfile import ZipFile
+
+from tfjm.lists import get_sympa_client
+from tfjm.matrix import Matrix
+from tfjm.views import AdminMixin
+from django.contrib.auth.mixins import LoginRequiredMixin
+from django.contrib.sites.models import Site
+from django.core.exceptions import PermissionDenied
+from django.core.mail import send_mail
+from django.db import transaction
+from django.http import HttpResponse
+from django.shortcuts import redirect
+from django.template.loader import render_to_string
+from django.urls import reverse_lazy
+from django.utils.translation import gettext_lazy as _
+from django.views.generic import CreateView, DeleteView, DetailView, FormView, RedirectView, TemplateView, UpdateView
+from django.views.generic.edit import FormMixin, ProcessFormView
+from django_tables2 import SingleTableView
+from magic import Magic
+from registration.models import AdminRegistration
+
+from .forms import JoinTeamForm, ParticipationForm, PhaseForm, QuestionForm, \
+    ReceiveParticipationForm, RequestValidationForm, SendParticipationForm, TeamForm, \
+    UploadVideoForm, ValidateParticipationForm
+from .models import Participation, Phase, Question, Team, Video
+from .tables import CalendarTable, TeamTable
+
+
+class CreateTeamView(LoginRequiredMixin, CreateView):
+    """
+    Display the page to create a team for new users.
+    """
+
+    model = Team
+    form_class = TeamForm
+    extra_context = dict(title=_("Create team"))
+    template_name = "participation/create_team.html"
+
+    def dispatch(self, request, *args, **kwargs):
+        user = request.user
+        if not user.is_authenticated:
+            return super().handle_no_permission()
+        registration = user.registration
+        if not registration.participates:
+            raise PermissionDenied(_("You don't participate, so you can't create a team."))
+        elif registration.team:
+            raise PermissionDenied(_("You are already in a team."))
+        return super().dispatch(request, *args, **kwargs)
+
+    @transaction.atomic
+    def form_valid(self, form):
+        """
+        When a team is about to be created, the user automatically
+        joins the team, a mailing list got created and the user is
+        automatically subscribed to this mailing list, and finally
+        a Matrix room is created and the user is invited in this room.
+        """
+        ret = super().form_valid(form)
+        # The user joins the team
+        user = self.request.user
+        registration = user.registration
+        registration.team = form.instance
+        registration.save()
+
+        # Subscribe the user mail address to the team mailing list
+        get_sympa_client().subscribe(user.email, f"equipe-{form.instance.trigram.lower()}", False,
+                                     f"{user.first_name} {user.last_name}")
+
+        # Invite the user in the team Matrix room
+        Matrix.invite(f"#equipe-{form.instance.trigram.lower()}:tfjm.org",
+                      f"@{user.registration.matrix_username}:tfjm.org")
+        return ret
+
+    def get_success_url(self):
+        return reverse_lazy("participation:team_detail", args=(self.object.pk,))
+
+
+class JoinTeamView(LoginRequiredMixin, FormView):
+    """
+    Participants can join a team with the access code of the team.
+    """
+    model = Team
+    form_class = JoinTeamForm
+    extra_context = dict(title=_("Join team"))
+    template_name = "participation/create_team.html"
+
+    def dispatch(self, request, *args, **kwargs):
+        user = request.user
+        if not user.is_authenticated:
+            return super().handle_no_permission()
+        registration = user.registration
+        if not registration.participates:
+            raise PermissionDenied(_("You don't participate, so you can't create a team."))
+        elif registration.team:
+            raise PermissionDenied(_("You are already in a team."))
+        return super().dispatch(request, *args, **kwargs)
+
+    @transaction.atomic
+    def form_valid(self, form):
+        """
+        When a user joins a team, the user is automatically subscribed to
+        the team mailing list,the user is invited in the team Matrix room.
+        """
+        self.object = form.instance
+        ret = super().form_valid(form)
+
+        # Join the team
+        user = self.request.user
+        registration = user.registration
+        registration.team = form.instance
+        registration.save()
+
+        # Subscribe to the team mailing list
+        get_sympa_client().subscribe(user.email, f"equipe-{form.instance.trigram.lower()}", False,
+                                     f"{user.first_name} {user.last_name}")
+
+        # Invite the user in the team Matrix room
+        Matrix.invite(f"#equipe-{form.instance.trigram.lower()}:tfjm.org",
+                      f"@{user.registration.matrix_username}:tfjm.org")
+        return ret
+
+    def get_success_url(self):
+        return reverse_lazy("participation:team_detail", args=(self.object.pk,))
+
+
+class TeamListView(AdminMixin, SingleTableView):
+    """
+    Display the whole list of teams
+    """
+    model = Team
+    table_class = TeamTable
+    ordering = ('participation__problem', 'trigram',)
+
+
+class MyTeamDetailView(LoginRequiredMixin, RedirectView):
+    """
+    Redirect to the detail of the team in which the user is.
+    """
+
+    def get_redirect_url(self, *args, **kwargs):
+        user = self.request.user
+        registration = user.registration
+        if registration.participates:
+            if registration.team:
+                return reverse_lazy("participation:team_detail", args=(registration.team_id,))
+            raise PermissionDenied(_("You are not in a team."))
+        raise PermissionDenied(_("You don't participate, so you don't have any team."))
+
+
+class TeamDetailView(LoginRequiredMixin, FormMixin, ProcessFormView, DetailView):
+    """
+    Display the detail of a team.
+    """
+    model = Team
+
+    def get(self, request, *args, **kwargs):
+        user = request.user
+        self.object = self.get_object()
+        # Ensure that the user is an admin or a member of the team
+        if user.registration.is_admin or user.registration.participates and \
+                user.registration.team and user.registration.team.pk == kwargs["pk"]:
+            return super().get(request, *args, **kwargs)
+        raise PermissionDenied
+
+    def get_context_data(self, **kwargs):
+        context = super().get_context_data(**kwargs)
+
+        team = self.get_object()
+        context["title"] = _("Detail of team {trigram}").format(trigram=self.object.trigram)
+        context["request_validation_form"] = RequestValidationForm(self.request.POST or None)
+        context["validation_form"] = ValidateParticipationForm(self.request.POST or None)
+        # A team is complete when there are at least 3 members that have sent their photo authorization
+        # and confirmed their email address
+        context["can_validate"] = team.students.count() >= 3 and \
+            all(r.email_confirmed for r in team.students.all()) and \
+            all(r.photo_authorization for r in team.students.all()) and \
+            team.participation.problem
+
+        return context
+
+    def get_form_class(self):
+        if not self.request.POST:
+            return RequestValidationForm
+        elif self.request.POST["_form_type"] == "RequestValidationForm":
+            return RequestValidationForm
+        elif self.request.POST["_form_type"] == "ValidateParticipationForm":
+            return ValidateParticipationForm
+
+    def form_valid(self, form):
+        self.object = self.get_object()
+        if isinstance(form, RequestValidationForm):
+            return self.handle_request_validation(form)
+        elif isinstance(form, ValidateParticipationForm):
+            return self.handle_validate_participation(form)
+
+    def handle_request_validation(self, form):
+        """
+        A team requests to be validated
+        """
+        if not self.request.user.registration.participates:
+            form.add_error(None, _("You don't participate, so you can't request the validation of the team."))
+            return self.form_invalid(form)
+        if self.object.participation.valid is not None:
+            form.add_error(None, _("The validation of the team is already done or pending."))
+            return self.form_invalid(form)
+        if not self.get_context_data()["can_validate"]:
+            form.add_error(None, _("The team can't be validated: missing email address confirmations, "
+                                   "photo authorizations, people or the chosen problem is not set."))
+            return self.form_invalid(form)
+
+        self.object.participation.valid = False
+        self.object.participation.save()
+
+        for admin in AdminRegistration.objects.all():
+            mail_context = dict(user=admin.user, team=self.object, domain=Site.objects.first().domain)
+            mail_plain = render_to_string("participation/mails/request_validation.txt", mail_context)
+            mail_html = render_to_string("participation/mails/request_validation.html", mail_context)
+            admin.user.email_user("[Corres2math] Validation d'équipe", mail_plain, html_message=mail_html)
+        return super().form_valid(form)
+
+    def handle_validate_participation(self, form):
+        """
+        An admin validates the team (or not)
+        """
+        if not self.request.user.registration.is_admin:
+            form.add_error(None, _("You are not an administrator."))
+            return self.form_invalid(form)
+        elif self.object.participation.valid is not False:
+            form.add_error(None, _("This team has no pending validation."))
+            return self.form_invalid(form)
+
+        if "validate" in self.request.POST:
+            self.object.participation.valid = True
+            self.object.participation.save()
+            mail_context = dict(team=self.object, message=form.cleaned_data["message"])
+            mail_plain = render_to_string("participation/mails/team_validated.txt", mail_context)
+            mail_html = render_to_string("participation/mails/team_validated.html", mail_context)
+            send_mail("[Corres2math] Équipe validée", mail_plain, None, [self.object.email], html_message=mail_html)
+
+            get_sympa_client().subscribe(self.object.email, "equipes", False, f"Equipe {self.object.name}")
+            get_sympa_client().unsubscribe(self.object.email, "equipes-non-valides", False)
+            get_sympa_client().subscribe(self.object.email, f"probleme-{self.object.participation.problem}", False,
+                                         f"Equipe {self.object.name}")
+        elif "invalidate" in self.request.POST:
+            self.object.participation.valid = None
+            self.object.participation.save()
+            mail_context = dict(team=self.object, message=form.cleaned_data["message"])
+            mail_plain = render_to_string("participation/mails/team_not_validated.txt", mail_context)
+            mail_html = render_to_string("participation/mails/team_not_validated.html", mail_context)
+            send_mail("[Corres2math] Équipe non validée", mail_plain, None, [self.object.email],
+                      html_message=mail_html)
+        else:
+            form.add_error(None, _("You must specify if you validate the registration or not."))
+            return self.form_invalid(form)
+        return super().form_valid(form)
+
+    def get_success_url(self):
+        return self.request.path
+
+
+class TeamUpdateView(LoginRequiredMixin, UpdateView):
+    """
+    Update the detail of a team
+    """
+    model = Team
+    form_class = TeamForm
+    template_name = "participation/update_team.html"
+
+    def dispatch(self, request, *args, **kwargs):
+        user = request.user
+        if not user.is_authenticated:
+            return super().handle_no_permission()
+        if user.registration.is_admin or user.registration.participates and \
+                user.registration.team and \
+                user.registration.team.pk == kwargs["pk"]:
+            return super().dispatch(request, *args, **kwargs)
+        raise PermissionDenied
+
+    def get_context_data(self, **kwargs):
+        context = super().get_context_data(**kwargs)
+        context["participation_form"] = ParticipationForm(data=self.request.POST or None,
+                                                          instance=self.object.participation)
+        context["title"] = _("Update team {trigram}").format(trigram=self.object.trigram)
+        return context
+
+    @transaction.atomic
+    def form_valid(self, form):
+        participation_form = ParticipationForm(data=self.request.POST or None, instance=self.object.participation)
+        if not participation_form.is_valid():
+            return self.form_invalid(form)
+
+        participation_form.save()
+        return super().form_valid(form)
+
+    def get_success_url(self):
+        return reverse_lazy("participation:team_detail", args=(self.object.pk,))
+
+
+class TeamAuthorizationsView(LoginRequiredMixin, DetailView):
+    """
+    Get as a ZIP archive all the authorizations that are sent
+    """
+    model = Team
+
+    def dispatch(self, request, *args, **kwargs):
+        user = request.user
+        if not user.is_authenticated:
+            return super().handle_no_permission()
+        if user.registration.is_admin or user.registration.participates and user.registration.team.pk == kwargs["pk"]:
+            return super().dispatch(request, *args, **kwargs)
+        raise PermissionDenied
+
+    def get(self, request, *args, **kwargs):
+        team = self.get_object()
+        output = BytesIO()
+        zf = ZipFile(output, "w")
+        for student in team.students.all():
+            magic = Magic(mime=True)
+            mime_type = magic.from_file("media/" + student.photo_authorization.name)
+            ext = mime_type.split("/")[1].replace("jpeg", "jpg")
+            zf.write("media/" + student.photo_authorization.name,
+                     _("Photo authorization of {student}.{ext}").format(student=str(student), ext=ext))
+        zf.close()
+        response = HttpResponse(content_type="application/zip")
+        response["Content-Disposition"] = "attachment; filename=\"{filename}\"" \
+            .format(filename=_("Photo authorizations of team {trigram}.zip").format(trigram=team.trigram))
+        response.write(output.getvalue())
+        return response
+
+
+class TeamLeaveView(LoginRequiredMixin, TemplateView):
+    """
+    A team member leaves a team
+    """
+    template_name = "participation/team_leave.html"
+    extra_context = dict(title=_("Leave team"))
+
+    def dispatch(self, request, *args, **kwargs):
+        if not request.user.is_authenticated:
+            return self.handle_no_permission()
+        if not request.user.registration.participates or not request.user.registration.team:
+            raise PermissionDenied(_("You are not in a team."))
+        if request.user.registration.team.participation.valid:
+            raise PermissionDenied(_("The team is already validated or the validation is pending."))
+        return super().dispatch(request, *args, **kwargs)
+
+    @transaction.atomic()
+    def post(self, request, *args, **kwargs):
+        """
+        When the team is left, the user is unsubscribed from the team mailing list
+        and kicked from the team room.
+        """
+        team = request.user.registration.team
+        request.user.registration.team = None
+        request.user.registration.save()
+        get_sympa_client().unsubscribe(request.user.email, f"equipe-{team.trigram.lower()}", False)
+        Matrix.kick(f"#equipe-{team.trigram.lower()}:tfjm.org",
+                    f"@{request.user.registration.matrix_username}:tfjm.org",
+                    "Équipe quittée")
+        if team.students.count() + team.coachs.count() == 0:
+            team.delete()
+        return redirect(reverse_lazy("index"))
+
+
+class MyParticipationDetailView(LoginRequiredMixin, RedirectView):
+    """
+    Redirects to the detail view of the participation of the team.
+    """
+    def get_redirect_url(self, *args, **kwargs):
+        user = self.request.user
+        registration = user.registration
+        if registration.participates:
+            if registration.team:
+                return reverse_lazy("participation:participation_detail", args=(registration.team.participation.id,))
+            raise PermissionDenied(_("You are not in a team."))
+        raise PermissionDenied(_("You don't participate, so you don't have any team."))
+
+
+class ParticipationDetailView(LoginRequiredMixin, DetailView):
+    """
+    Display detail about the participation of a team, and manage the video submission.
+    """
+    model = Participation
+
+    def dispatch(self, request, *args, **kwargs):
+        user = request.user
+        if not user.is_authenticated:
+            return super().handle_no_permission()
+        if not self.get_object().valid:
+            raise PermissionDenied(_("The team is not validated yet."))
+        if user.registration.is_admin or user.registration.participates \
+                and user.registration.team.participation \
+                and user.registration.team.participation.pk == kwargs["pk"]:
+            return super().dispatch(request, *args, **kwargs)
+        raise PermissionDenied
+
+    def get_context_data(self, **kwargs):
+        context = super().get_context_data(**kwargs)
+
+        context["title"] = lambda: _("Participation of team {trigram}").format(trigram=self.object.team.trigram)
+        context["current_phase"] = Phase.current_phase()
+
+        return context
+
+
+class SetParticipationReceiveParticipationView(AdminMixin, UpdateView):
+    """
+    Define the solution that a team will receive.
+    """
+    model = Participation
+    form_class = ReceiveParticipationForm
+    template_name = "participation/receive_participation_form.html"
+
+    def get_success_url(self):
+        return reverse_lazy("participation:participation_detail", args=(self.kwargs["pk"],))
+
+
+class SetParticipationSendParticipationView(AdminMixin, UpdateView):
+    """
+    Define the team where the solution will be sent.
+    """
+    model = Participation
+    form_class = SendParticipationForm
+    template_name = "participation/send_participation_form.html"
+
+    def get_success_url(self):
+        return reverse_lazy("participation:participation_detail", args=(self.kwargs["pk"],))
+
+
+class CreateQuestionView(LoginRequiredMixin, CreateView):
+    """
+    Ask a question to another team.
+    """
+    participation: Participation
+    model = Question
+    form_class = QuestionForm
+    extra_context = dict(title=_("Create question"))
+
+    def dispatch(self, request, *args, **kwargs):
+        if not request.user.is_authenticated:
+            return self.handle_no_permission()
+        self.participation = Participation.objects.get(pk=kwargs["pk"])
+        if request.user.registration.is_admin or \
+                request.user.registration.participates and \
+                self.participation.valid and \
+                request.user.registration.team.pk == self.participation.team_id:
+            return super().dispatch(request, *args, **kwargs)
+        raise PermissionDenied
+
+    def form_valid(self, form):
+        form.instance.participation = self.participation
+        return super().form_valid(form)
+
+    def get_success_url(self):
+        return reverse_lazy("participation:participation_detail", args=(self.participation.pk,))
+
+
+class UpdateQuestionView(LoginRequiredMixin, UpdateView):
+    """
+    Edit a question.
+    """
+    model = Question
+    form_class = QuestionForm
+
+    def dispatch(self, request, *args, **kwargs):
+        self.object = self.get_object()
+        if not request.user.is_authenticated:
+            return self.handle_no_permission()
+        if request.user.registration.is_admin or \
+                request.user.registration.participates and \
+                self.object.participation.valid and \
+                request.user.registration.team.pk == self.object.participation.team_id:
+            return super().dispatch(request, *args, **kwargs)
+        raise PermissionDenied
+
+    def get_success_url(self):
+        return reverse_lazy("participation:participation_detail", args=(self.object.participation.pk,))
+
+
+class DeleteQuestionView(LoginRequiredMixin, DeleteView):
+    """
+    Remove a question.
+    """
+    model = Question
+    extra_context = dict(title=_("Delete question"))
+
+    def dispatch(self, request, *args, **kwargs):
+        self.object = self.get_object()
+        if not request.user.is_authenticated:
+            return self.handle_no_permission()
+        if request.user.registration.is_admin or \
+                request.user.registration.participates and \
+                self.object.participation.valid and \
+                request.user.registration.team.pk == self.object.participation.team_id:
+            return super().dispatch(request, *args, **kwargs)
+        raise PermissionDenied
+
+    def get_success_url(self):
+        return reverse_lazy("participation:participation_detail", args=(self.object.participation.pk,))
+
+
+class UploadVideoView(LoginRequiredMixin, UpdateView):
+    """
+    Upload a solution video for a team.
+    """
+    model = Video
+    form_class = UploadVideoForm
+    template_name = "participation/upload_video.html"
+    extra_context = dict(title=_("Upload video"))
+
+    def dispatch(self, request, *args, **kwargs):
+        user = request.user
+        if not user.is_authenticated:
+            return super().handle_no_permission()
+        if user.registration.is_admin or user.registration.participates \
+                and user.registration.team.participation.pk == self.get_object().participation.pk:
+            return super().dispatch(request, *args, **kwargs)
+        raise PermissionDenied
+
+    def get_success_url(self):
+        return reverse_lazy("participation:participation_detail", args=(self.object.participation.pk,))
+
+
+class CalendarView(SingleTableView):
+    """
+    Display the calendar of the action.
+    """
+    table_class = CalendarTable
+    model = Phase
+    extra_context = dict(title=_("Calendar"))
+
+
+class PhaseUpdateView(AdminMixin, UpdateView):
+    """
+    Update a phase of the calendar, if we have sufficient rights.
+    """
+    model = Phase
+    form_class = PhaseForm
+    extra_context = dict(title=_("Calendar update"))
+
+    def get_success_url(self):
+        return reverse_lazy("participation:calendar")