import os

from django.conf import settings
from django.contrib.auth.decorators import login_required
from django.http import JsonResponse, HttpResponse
from django.shortcuts import get_object_or_404
from django.template import loader
from django.utils.decorators import method_decorator
from django.views.decorators.csrf import csrf_exempt
from django.views.decorators.http import require_http_methods
from django.views.generic import TemplateView, DetailView

from apps.content.models import Contest, ContestWork, FAQ
from apps.course.models import ContestWorkComment
from apps.user.models import Child


@method_decorator(login_required, name='dispatch')
class ContestEditView(TemplateView):
    template_name = 'content/contest_edit.html'
    query_pk_and_slug = True

    def get(self, request, slug=None, lesson=None):
        if slug:
            self.object = get_object_or_404(Contest, slug=slug)
        else:
            self.object = Contest()

        return super().get(request)

    def get_context_data(self):
        context = super().get_context_data()
        context['object'] = self.object
        return context


class ContestView(DetailView):
    model = Contest
    context_object_name = 'contest'
    template_name = 'content/contest.html'
    query_pk_and_slug = True

    def get_context_data(self, *args, **kwargs):
        context = super().get_context_data()
        if self.request.user.is_authenticated:
            context['contest_work_uploaded'] = ContestWork.objects.filter(user=self.request.user).exists()
        return context


class ContestWorkView(DetailView):
    model = ContestWork
    context_object_name = 'contest_work'
    template_name = 'content/contest_work.html'

    def get_context_data(self, *args, **kwargs):
        context = super().get_context_data()
        prev_contest_work = ContestWork.objects.filter(created_at__gt=self.object.created_at)[:1]
        if prev_contest_work:
            context['prev_contest_work'] = prev_contest_work[0]
        next_contest_work = ContestWork.objects.filter(created_at__lt=self.object.created_at)[:1]
        if next_contest_work:
            context['next_contest_work'] = next_contest_work[0]

        context['user_liked'] = self.object.likes.filter(user=self.request.user).exists() \
            if self.request.user.is_authenticated else False
        context['likes_count'] = self.object.likes.filter(user__is_active=True).count()
        return context


@login_required
@csrf_exempt
@require_http_methods(['POST'])
def contest_work_comment(request, contest_work_id):
    try:
        contest_work = ContestWork.objects.get(id=contest_work_id)
    except ContestWork.DoesNotExist:
        return JsonResponse({
            'success': False,
            'errors': ['Contest_work with id f{contest_work_id} not found']
        }, status=400)
    else:
        reply_to = request.POST.get('reply_id', 0)
        comment = request.POST.get('comment', '')
        if not comment:
            return JsonResponse({
                'success': False,
                'errors': ['Comment can not be empty']
            }, status=400)

        if not int(reply_to):
            contest_work_comment = ContestWorkComment.objects.create(
                author=request.user,
                content=comment,
                contest_work=contest_work,
            )
        else:
            try:
                _contest_work_comment = ContestWorkComment.objects.get(id=reply_to)
            except ContestWorkComment.DoesNotExist:
                return JsonResponse({
                    'success': False,
                    'errors': ['LessonComment with id f{reply_to} not found']
                }, status=400)
            else:
                contest_work_comment = ContestWorkComment.objects.create(
                    author=request.user,
                    content=comment,
                    contest_work=contest_work,
                    parent=_contest_work_comment,
                )
        ctx = {'node': contest_work_comment, 'user': request.user}
        html = loader.render_to_string('templates/blocks/comment.html', ctx)
        return JsonResponse({
            'success': True,
            'comment': html,
        })


class FAQView(TemplateView):
    template_name = 'content/faq.html'

    def get(self, request, *args, **kwargs):
        context = self.get_context_data(**kwargs)
        context['faqs'] = [{
            'question': f.question,
            'answer': f.answer,
            'opened': 0,
        } for f in FAQ.objects.all()]
        return self.render_to_response(context)

from apps.notification.tasks import draw_cert

@csrf_exempt
def get_certificate(request, cert):
    signed_path_pattern = 'signed-user-certificates/%d.jpg'
    fn = signed_path_pattern % cert
    path = os.path.join(settings.RESOURCES_ROOT, fn)
    child_id = request.GET.get('child_id')
    if child_id:
        child = get_object_or_404(Child, pk=child_id)
        path = draw_cert(path, child.user.email, child.first_name, child.last_name)
    f = open(path, 'rb')
    response = HttpResponse(f, content_type='image/jpeg')
    response['Content-Disposition'] = 'attachment; filename=%s' % fn
    f.close()
    if child_id:
        os.remove(path)
    return response