import random

import google_auth_oauthlib
import googleapiclient
from django.conf import settings
from django.contrib import messages
from django.contrib.auth.mixins import LoginRequiredMixin
from django.contrib.auth.models import User
from django.contrib.messages.views import SuccessMessageMixin
from django.core.exceptions import PermissionDenied
from django.db import IntegrityError
from django.db.models import Count, Q
from django.shortcuts import get_object_or_404, redirect
from django.views import View
from django.views.generic import TemplateView
from django.views.generic.detail import DetailView, SingleObjectMixin
from django.views.generic.edit import CreateView, DeleteView, UpdateView

from . import forms, models, utils


class HomeView(LoginRequiredMixin, TemplateView):
    template_name = "game/home.html"

    def get_context_data(self, **kwargs):
        data = super().get_context_data(**kwargs)
        data["group_form"] = forms.GroupForm()
        return data


class OwnerFilterMixin(LoginRequiredMixin):
    def get_queryset(self):
        return super().get_queryset().filter(owner=self.request.user)


class MemberFilterMixin(LoginRequiredMixin):
    def get_queryset(self):
        return (
            super()
            .get_queryset()
            .filter(Q(members=self.request.user) | Q(owner=self.request.user))
            .distinct()
        )


class GroupMixin:
    model = models.Group
    fields = ["name"]


class GroupIntegrityMixin:
    def form_valid(self, form):
        try:
            return super().form_valid(form)
        except IntegrityError:
            form.add_error("name", "Ce nom de groupe existe déjà.")
            return super().form_invalid(form)


class GroupCreateView(LoginRequiredMixin, GroupMixin, GroupIntegrityMixin, CreateView):
    def form_valid(self, form):
        form.instance.owner = self.request.user
        return super().form_valid(form)


class GroupUpdateView(OwnerFilterMixin, GroupMixin, GroupIntegrityMixin, UpdateView):
    pass


class GroupDeleteView(OwnerFilterMixin, GroupMixin, SuccessMessageMixin, DeleteView):
    success_url = "/"
    success_message = "Le groupe a été supprimé avec succès."


class GroupDetailView(MemberFilterMixin, GroupMixin, DetailView):
    def get_context_data(self, **kwargs):
        data = super().get_context_data(**kwargs)

        data["musics"] = data["group"].musicvideo_set.filter(owner=self.request.user)
        data["owner_count"] = (
            data["group"]
            .musicvideo_set.filter(owner=data["group"].owner, blacklisted=False)
            .count()
        )
        data["members"] = models.Group.members.through.objects.filter(
            group=data["group"]
        ).annotate(
            count=Count(
                "user__musicvideo",
                filter=Q(
                    user__musicvideo__group=data["group"],
                    user__musicvideo__blacklisted=False,
                ),
            )
        )
        data["is_leader"] = data["group"].is_leader(self.request.user)
        data["is_owner"] = data["group"].is_owner(self.request.user)

        return data


class GroupAddMusicView(MemberFilterMixin, SingleObjectMixin, View):
    model = models.Group

    def post(self, request, pk):
        group = self.get_object()
        yt_id = request.POST.get("yt_id")
        if not yt_id:
            messages.add_message(request, messages.ERROR, "Aucun identifiant donné")
            return redirect(group)
        yt_id = utils.parse_musik(yt_id)

        title = utils.get_yt_title(yt_id)
        if not title:
            messages.add_message(
                request, messages.ERROR, f"Vidéo Youtube invalide : {yt_id}"
            )
            return redirect(group)
        try:
            group.musicvideo_set.create(yt_id=yt_id, title=title, owner=request.user)
        except IntegrityError:
            messages.add_message(
                request, messages.ERROR, f"Vidéo Youtube déjà ajoutée : {yt_id}"
            )

        messages.add_message(
            request, messages.SUCCESS, f"Vidéo Youtube ajoutée : {yt_id}"
        )
        return redirect(group)


class GroupAddMemberView(MemberFilterMixin, SingleObjectMixin, View):
    model = models.Group

    def post(self, request, pk):
        group = self.get_object()
        if not group.is_leader(request.user):
            raise PermissionDenied()
        username = request.POST.get("username")
        user = User.objects.get(username=username)
        if user == group.owner:
            messages.add_message(
                request, messages.WARNING, f"{user} est le propriétaire du groupe."
            )
            return redirect(group)
        if user in group.members.all():
            messages.add_message(
                request, messages.WARNING, f"{user} est déjà membre du groupe."
            )

        group.members.add(user)
        return redirect(group)


class GroupRemoveMusicView(MemberFilterMixin, SingleObjectMixin, View):
    model = models.Group

    def post(self, request, pk):
        group = self.get_object()
        musics = group.musicvideo_set.filter(
            owner=request.user, pk__in=request.POST.getlist("musics")
        )

        if musics.count() == 0:
            messages.add_message(request, messages.INFO, "Aucune musique supprimée.")
            return redirect(group)
        if musics.count() != len(request.POST.getlist("musics")):
            messages.add_message(
                request,
                messages.WARNING,
                "Certaines musiques n'ont pas pu être supprimées.",
            )
            musics.delete()
        else:
            musics.delete()
            messages.add_message(
                request,
                messages.SUCCESS,
                "Les musiques sélectionnées ont été supprimées.",
            )
        return redirect(group)


class GroupUnblacklistMusicView(MemberFilterMixin, SingleObjectMixin, View):
    model = models.Group

    def post(self, request, pk):
        group = self.get_object()
        musics = group.musicvideo_set.filter(
            owner=request.user, pk__in=request.POST.getlist("musics")
        )

        musics.update(blacklisted=False)
        messages.add_message(
            request,
            messages.SUCCESS,
            "Les musiques sélectionnées ont été enlevées de la blacklist.",
        )
        return redirect(group)


class GroupRemoveMemberView(MemberFilterMixin, SingleObjectMixin, View):
    model = models.Group

    def post(self, request, pk):
        group = self.get_object()
        if not group.is_leader(request.user):
            raise PermissionDenied()

        relations = models.Group.members.through.objects.filter(
            group=group, pk__in=request.POST.getlist("member")
        )
        if relations.count() == 0:
            messages.add_message(request, messages.INFO, "Aucun membre supprimé.")
            return redirect(group)
        if relations.count() != len(request.POST.getlist("member")):
            messages.add_message(
                request,
                messages.WARNING,
                "Certains membres n'ont pas pu être supprimés.",
            )
            relations.delete()
        else:
            relations.delete()
            messages.add_message(
                request,
                messages.SUCCESS,
                "Les membres sélectionnés ont été supprimés.",
            )

        return redirect(group)


class GroupSetLead(OwnerFilterMixin, SingleObjectMixin, View):
    model = models.Group

    def post(self, request, pk):
        group = self.get_object()

        members = models.Group.members.through.objects.filter(group=group)
        for member in members.filter(pk__in=request.POST.getlist("leader")):
            models.GroupLeader.objects.update_or_create(
                member=member, defaults={"is_leader": True}
            )
        for member in members.exclude(pk__in=request.POST.getlist("leader")):
            models.GroupLeader.objects.update_or_create(
                member=member, defaults={"is_leader": False}
            )

        return redirect(group)


class GroupRemoveGameView(OwnerFilterMixin, SingleObjectMixin, View):
    model = models.Group

    def post(self, request, pk):
        group = self.get_object()

        games = group.musikgame_set.filter(pk__in=request.POST.getlist("game"))

        if games.count() == 0:
            messages.add_message(request, messages.INFO, "Aucune partie supprimé.")
            return redirect(group)
        if games.count() != len(request.POST.getlist("game")):
            messages.add_message(
                request,
                messages.WARNING,
                "Certaines parties n'ont pas pu être supprimées.",
            )
            games.delete()
        else:
            games.delete()
            messages.add_message(
                request,
                messages.SUCCESS,
                "Les parties sélectionnées ont été supprimées.",
            )

        return redirect(group)


class GameCreateView(LoginRequiredMixin, CreateView):
    model = models.MusikGame
    form_class = forms.MusikGameForm

    def get_form_kwargs(self):
        kwargs = super().get_form_kwargs()
        kwargs["group"] = self.kwargs["pk"]
        return kwargs

    def get_context_data(self, **kwargs):
        data = super().get_context_data(**kwargs)
        data["group"] = get_object_or_404(models.Group, pk=self.kwargs["pk"])
        if not data["group"].is_leader(self.request.user):
            raise PermissionDenied()
        return data

    def form_valid(self, form):
        group = get_object_or_404(models.Group, pk=self.kwargs["pk"])
        if not group.is_leader(self.request.user):
            return super().form_invalid(form)
        form.instance.group = group
        res = super().form_valid(form)
        players = []
        musics = []
        n = form.instance.n
        for player in form.instance.players.all():
            music_set = player.musicvideo_set.filter(group=group, blacklisted=False)
            if music_set.count() < n:
                form.instance.delete()
                form.add_error("n", f"{player} n'a pas assez de musiques.")
                return super().form_invalid(form)
            players += n * [player]
            musics += random.sample(
                list(music_set.all()),
                n,
            )

        pm_list = list(zip(players, musics))
        random.shuffle(pm_list)
        for (player, music), order in zip(pm_list, range(1, len(pm_list) + 1)):
            music.blacklisted = True
            music.save()
            models.MusicGameOrder.objects.create(
                game=form.instance, player=player, music_video=music, order=order
            )

        if models.YoutubeCredentials.objects.filter(user=self.request.user).exists():
            form.instance.playlist_loading = True
            form.instance.save()
        return res


class GameDetailView(LoginRequiredMixin, DetailView):
    model = models.MusikGame

    def get_queryset(self):
        return (
            super()
            .get_queryset()
            .filter(
                Q(group__members=self.request.user) | Q(group__owner=self.request.user)
            )
            .distinct()
        )

    def get_context_data(self, **kwargs):
        data = super().get_context_data(**kwargs)
        data["is_leader"] = data["musikgame"].group.is_leader(self.request.user)
        data["is_owner"] = data["musikgame"].group.is_owner(self.request.user)
        return data


class YoutubeCallbackView(LoginRequiredMixin, View):
    def get(self, request):
        if err := request.GET.get("error"):
            messages.add_message(
                request, messages.ERROR, f"Échec de la connexion à Youtube : {err}"
            )
            return redirect("/")

        state = self.request.session.get("state")
        flow = google_auth_oauthlib.flow.Flow.from_client_secrets_file(
            settings.YOUTUBE_OAUTH_SECRETS,
            ["https://www.googleapis.com/auth/youtube.force-ssl"],
            state=state,
        )
        flow.redirect_uri = request.build_absolute_uri("/youtube_callback/")

        flow.fetch_token(code=request.GET.get("code"))

        credentials = flow.credentials

        yt_api = googleapiclient.discovery.build(
            "youtube", "v3", credentials=credentials
        )
        channel_request = yt_api.channels().list(part="snippet", mine=True)
        res = channel_request.execute()

        models.YoutubeCredentials.objects.update_or_create(
            user=request.user,
            defaults={
                "credentials": {
                    "token": credentials.token,
                    "refresh_token": credentials.refresh_token,
                    "token_uri": credentials.token_uri,
                    "client_id": credentials.client_id,
                    "client_secret": credentials.client_secret,
                    "granted_scopes": credentials.granted_scopes,
                },
                "title": res["items"][0]["snippet"]["title"],
            },
        )
        messages.add_message(request, messages.SUCCESS, "Connexion à Youtube réussie.")
        return redirect("/")


class YoutubeLoginView(LoginRequiredMixin, View):
    def get(self, request):
        flow = google_auth_oauthlib.flow.Flow.from_client_secrets_file(
            settings.YOUTUBE_OAUTH_SECRETS,
            ["https://www.googleapis.com/auth/youtube.force-ssl"],
        )
        flow.redirect_uri = request.build_absolute_uri("/youtube_callback/")
        auth_url, state = flow.authorization_url(
            access_type="offline",
            include_granted_scopes="true",
            prompt="consent",
        )
        self.request.session["state"] = state
        return redirect(auth_url)


class YoutubeLogoutView(LoginRequiredMixin, View):
    def post(self, request):
        request.user.youtubecredentials.delete()
        return redirect("account_settings")


class GroupClearBlacklistView(MemberFilterMixin, SingleObjectMixin, View):
    model = models.Group

    def post(self, request, pk):
        group = self.get_object()
        if not group.is_leader(request.user):
            raise PermissionDenied()
        group.musicvideo_set.filter(blacklisted=True).update(blacklisted=False)
        messages.add_message(request, messages.SUCCESS, "La blacklist a été effacée.")
        return redirect(group)


class GameAnswerView(LoginRequiredMixin, DetailView):
    model = models.MusikGame
    template_name = "game/musikgame_answer.html"

    def get_queryset(self):
        return super().get_queryset().filter(over=False, players=self.request.user)

    def get_context_data(self, **kwargs):
        return super().get_context_data(**kwargs) | {
            "form": forms.AnswerForm(game=self.object, user=self.request.user)
        }

    def post(self, request, pk):
        game = self.get_object()
        for music in game.musicgameorder_set.all():
            answer = request.POST.get(f"answer-{music.order}")
            if answer:
                models.MusicGameAnswer.objects.update_or_create(
                    game=music,
                    player=request.user,
                    defaults={"answer": game.players.get(pk=answer)},
                )
            else:
                models.MusicGameAnswer.objects.update_or_create(
                    game=music,
                    player=request.user,
                    defaults={"answer": None},
                )
        return redirect("game_answer", pk)


class GameEndView(LoginRequiredMixin, SingleObjectMixin, View):
    model = models.MusikGame

    def post(self, request, pk):
        game = self.get_object()
        if not game.group.is_leader(request.user):
            raise PermissionDenied()
        game.over = True
        game.save()
        return redirect("game_detail", pk)