from django.template import RequestContext
from django.shortcuts import render
from django.views import View
from django.views.generic.base import TemplateView
from django.contrib.auth.decorators import login_required
from django.conf import settings
from django.http import Http404
from django.http import HttpResponse
from django.http import HttpResponseRedirect
from django.db.models import Case, When, Value, IntegerField, Count, F
from django.contrib.auth.mixins import LoginRequiredMixin

from LandingPage.models import User
from LandingPage.models import Show
from LandingPage.models import Season
from LandingPage.models import Episode
from LandingPage.models import Submission, SubmissionVote

from . import forms

import datetime

# Create your views here.

# Index page of a show
class IndexView(TemplateView):
    template_name = "show.html"

    def get_context_data(self, abbreviation, **kwargs):
        ctx = super().get_context_data()

        # Get show by abbreviation, add episode count to the show and return only the first object
        show = Show.objects.filter(abbr=abbreviation).first()

        # 404
        if not show:
            raise Http404("Show does not exist")

        # Get all seasons of the show and annotate episode counts onto them
        seasons = show.seasons.all()

        # Add fields to context
        ctx['show'] = show
        ctx['seasons'] = seasons

        return ctx

# Episodes page of a show
class EpisodeView(TemplateView):
    template_name = "episode.html"

    def get_context_data(self, abbreviation, season, episode, **kwargs):
        ctx = super().get_context_data()

        # Get show by abbreviation
        show = Show.objects.filter(abbr=abbreviation).first()

        # Get episode by season and episode number
        episode = Episode.objects.filter(show=show,season__number=season,episode=episode).first()

        # 404's
        if not show:
            raise Http404("Show does not exist")
        
        if not episode:
            raise Http404("Episode does not exist")

        # I acknowledge that this is a mess. A functional mess. But a mess nonetheless. Hey, that rhymed!
        submissions = episode.submissions.annotate(
            positives=Count(
                Case(
                    When(
                        votes__positive=True,
                        then=Value(1)
                        )
                    )
                ),
            negatives=Count('votes') - F('positives'),
            score=F('positives') - F('negatives')
        ).order_by('-score')

        # Add fields to context
        ctx['show'] = show
        ctx['episode'] = episode
        ctx['submissions'] = submissions

        return ctx

# Submission form GET and POST
@login_required
def SubmissionForm(req, abbreviation, season, episode):
    show = Show.objects.get(abbr=abbreviation)
    episode = Episode.objects.filter(show=show,season__number=season,episode=episode).first()
    user = req.user

    # 404's
    if not show:
        raise Http404("Show does not exist")

    if not episode:
        raise Http404("Episode does not exist")

    form = forms.SubmissionForm()

    # Request context
    ctx = {
        'form': form,
        'show': show,
        'episode': episode
    }

    # Handle POST
    if req.method == 'POST':
        form = forms.SubmissionForm(req.POST)
        ctx['form'] = form

        if form.is_valid():
            form_data = form.cleaned_data

            # Check if the URL has already been submitted
            if Submission.objects.filter(episode=episode,url=form_data['url']).count() > 0:
                ctx['error'] = 'This URL has already been submitted!'
                return render(req, "submit.html", ctx)

            # Check if there has been a submission by this user for this episode within the last 24 hours
            if Submission.objects.filter(user=user,episode=episode,timestamp__gte=datetime.datetime.now() - datetime.timedelta(hours=24)).count() > 0:
                ctx['error'] = 'You can only submit one link for an episode in 24 hours!'
                return render(req, "submit.html", ctx)

            # Have to do this because you can't add fields to a form
            # If you know a better way of doing this, be my guest
            new_submission = form.save(commit=False)
            new_submission.user = user
            new_submission.episode = episode
            new_submission.save()

            return HttpResponseRedirect('/show/%s/episode/%d/%d'%(abbreviation, episode.season.number, episode.episode))
        else:
            ctx['error'] = 'Invalid fields!'

    return render(req, "submit.html", ctx)

# Vote request
# /show/{{abbr}}/vote/{{submission id}}/{{positive == 1}}
class SubmissionVoteSubmit(LoginRequiredMixin, View):
    def post (self, req, abbreviation, subid, positive):
        # Convert positive parameter into a boolean
        pos_bool = int(positive) == 1

        user = req.user

        # Get the submission from the database
        submission = Submission.objects.filter(id=subid).first()

        # 404
        if not submission:
            raise Http404("Submission does not exist")

        # Prevent voting for own submission
        if submission.user == user:
            return HttpResponse('<h1>Error</h1><p>You cannot vote for your own submission.</p>', status=400)

        # Allow changing a vote from positive to negative or vice-versa. Delete vote if its a re-vote
        vote = submission.votes.filter(user=user,submission__id=submission.id).first()
        if vote:
            if not vote.positive == pos_bool:
                vote.positive = pos_bool
                vote.save()
            else:
                vote.delete()
        else:
            new_vote = SubmissionVote(
                    user=user,
                    submission=submission,
                    positive=pos_bool
                )
            new_vote.save()

        return HttpResponseRedirect('/show/%s/episode/%d/%d'%(abbreviation, submission.episode.season.number, submission.episode.episode))