import random

import google_auth_oauthlib
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.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.detail import DetailView, SingleObjectMixin
from django.views.generic.edit import CreateView, DeleteView, UpdateView

from . import forms, models, tasks, utils


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"] = data["group"].members.annotate(
            count=Count(
                "musicvideo",
                filter=Q(
                    musicvideo__group=data["group"], musicvideo__blacklisted=False
                ),
            )
        )

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

    def post(self, request, pk):
        group = self.get_object()
        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(OwnerFilterMixin, SingleObjectMixin, View):
    model = models.Group

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

        relations = models.Group.members.through.objects.filter(
            group=group, user__id__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 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, owner=self.request.user, pk=self.kwargs["pk"]
        )
        return data

    def form_valid(self, form):
        group = get_object_or_404(
            models.Group, owner=self.request.user, pk=self.kwargs["pk"]
        )
        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 creds := self.request.user.youtubecredentials:
            form.instance.playlist_loading = True
            form.instance.save()
            tasks.generate_playlist.delay_on_commit(creds.credentials, form.instance.pk)
        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()
        )


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 = "https://localhost/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 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 = "https://localhost/youtube_callback/"

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

        credentials = flow.credentials
        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,
                }
            },
        )

        messages.add_message(request, messages.SUCCESS, "Connexion à Youtube réussie.")
        return redirect("/")


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

    def post(self, request, pk):
        group = self.get_object()
        group.musicvideo_set.filter(blacklisted=True).update(blacklisted=False)
        messages.add_message(request, messages.SUCCESS, "La blacklist a été effacée.")
        return redirect(group)