from django.shortcuts import render, get_object_or_404, redirect
from django.views.generic.edit import CreateView, UpdateView, DeleteView
from django.contrib.auth.mixins import LoginRequiredMixin, UserPassesTestMixin
from django.contrib.auth.decorators import login_required
from django.urls import reverse_lazy
from .models import Event, Training, Game, EventParticipation
from .forms import EventForm, TrainingForm, GameForm, OpenGameForm
from accounts.models import CustomUser # Import CustomUser for manage_participation view
from django.utils import timezone
import datetime

def select_event_type(request):
    return render(request, 'calendars/select_event_type.html')

class CoachCheckMixin(UserPassesTestMixin):
    def test_func(self):
        user = self.request.user
        if user.is_superuser:
            return True
        team = self.get_object().team
        return user == team.head_coach or user in team.assistant_coaches.all()

class EventCreateView(LoginRequiredMixin, CreateView):
    model = Event
    form_class = EventForm
    template_name = 'calendars/event_form.html'
    success_url = reverse_lazy('dashboard')

    def get_form(self, form_class=None):
        form = super().get_form(form_class)
        user = self.request.user
        if not user.is_superuser:
            coached_teams = user.coached_teams.all()
            assisted_teams = user.assisted_teams.all()
            teams = coached_teams | assisted_teams
            form.fields['team'].queryset = teams
        return form

class TrainingCreateView(LoginRequiredMixin, CreateView):
    model = Training
    form_class = TrainingForm
    template_name = 'calendars/event_form.html'
    success_url = reverse_lazy('dashboard')

    def get_form(self, form_class=None):
        form = super().get_form(form_class)
        user = self.request.user
        if not user.is_superuser:
            coached_teams = user.coached_teams.all()
            assisted_teams = user.assisted_teams.all()
            teams = coached_teams | assisted_teams
            form.fields['team'].queryset = teams
        return form

class GameCreateView(LoginRequiredMixin, CreateView):
    model = Game
    form_class = GameForm
    template_name = 'calendars/event_form.html'
    success_url = reverse_lazy('dashboard')

    def get_form(self, form_class=None):
        form = super().get_form(form_class)
        user = self.request.user
        if not user.is_superuser:
            coached_teams = user.coached_teams.all()
            assisted_teams = user.assisted_teams.all()
            teams = coached_teams | assisted_teams
            form.fields['team'].queryset = teams
        return form

class EventUpdateView(LoginRequiredMixin, CoachCheckMixin, UpdateView):
    model = Event
    template_name = 'calendars/event_form.html'
    success_url = reverse_lazy('dashboard')

    def get_form_class(self):
        if hasattr(self.object, 'game'):
            return GameForm
        if hasattr(self.object, 'training'):
            return TrainingForm
        return EventForm

class EventDeleteView(LoginRequiredMixin, CoachCheckMixin, DeleteView):
    model = Event
    template_name = 'calendars/event_confirm_delete.html'
    success_url = reverse_lazy('dashboard')

@login_required
def manage_participation(request, child_id, event_id, status):
    child = get_object_or_404(CustomUser, id=child_id)
    event = get_object_or_404(Event, id=event_id)

    # Check if the logged-in user is a parent of the child
    if request.user not in child.parents.all():
        # Handle unauthorized access
        return redirect('dashboard')

    # Check for parallel events if accepting a support game
    if status == 'attending' and hasattr(event, 'game') and child.team in event.game.opened_for_teams.all():
        # A game's duration is defined as innings * 20 minutes + 1 hour travel.
        # I will assume 9 innings for now.
        game_duration = datetime.timedelta(minutes=(9 * 20 + 60))
        event_start = event.start_time
        event_end = event.start_time + game_duration

        parallel_events = Event.objects.filter(
            eventparticipation__user=child,
            eventparticipation__status='attending'
        ).exclude(id=event.id)

        for pe in parallel_events:
            pe_duration = datetime.timedelta(minutes=(9 * 20 + 60)) # Assuming 9 innings for all games
            pe_start = pe.start_time
            pe_end = pe.start_time + pe_duration
            
            # Check for overlap with a tolerance of +/- 2 hours
            if (event_start < pe_end + datetime.timedelta(hours=2) and event_end > pe_start - datetime.timedelta(hours=2)):
                # Handle parallel event conflict
                return redirect('dashboard') # Or show an error message

    participation, created = EventParticipation.objects.get_or_create(user=child, event=event)
    participation.status = status
    participation.save()

    return redirect('dashboard')

@login_required
def open_game(request, game_id):
    game = get_object_or_404(Game, id=game_id)
    club = game.team.club

    # Permission check: only head coach of the team's club can open the game
    if not request.user.is_superuser and request.user not in club.administrators.all():
        return redirect('dashboard')

    if request.method == 'POST':
        form = OpenGameForm(request.POST, club=club)
        if form.is_valid():
            teams = form.cleaned_data['teams']
            game.opened_for_teams.add(*teams)
            return redirect('dashboard')
    else:
        form = OpenGameForm(club=club)

    return render(request, 'calendars/open_game.html', {'form': form, 'game': game})