from datetime import datetime
from datetime import timedelta

from django.db.models import Count
from django.shortcuts import render
from django.utils.decorators import method_decorator
from django.views.decorators.csrf import csrf_protect

from boards import settings
from boards.models import Post
from boards.models import Tag, Attachment, STATUS_ACTIVE
from boards.views.base import BaseBoardView

PARAM_SECTION_STR = 'section_str'
PARAM_LATEST_THREADS = 'latest_threads'
PARAM_IMAGES = 'images'

TEMPLATE = 'boards/landing.html'

RANDOM_IMAGE_COUNT = 3


class LandingView(BaseBoardView):
    @method_decorator(csrf_protect)
    def get(self, request):
        params = dict()

        params[PARAM_SECTION_STR] = Tag.objects.get_tag_url_list(
                Tag.objects.filter(required=True))

        today = datetime.now() - timedelta(1)
        max_landing_threads = settings.get_int('View', 'MaxFavoriteThreads')
        ops = Post.objects.filter(thread__replies__pub_time__gt=today, opening=True, thread__status=STATUS_ACTIVE)\
                  .annotate(today_post_count=Count('thread__replies'))\
                  .order_by('-pub_time')[:max_landing_threads]
        params[PARAM_LATEST_THREADS] = ops

        params[PARAM_IMAGES] = Attachment.objects.get_random_images(
            RANDOM_IMAGE_COUNT)

        return render(request, TEMPLATE, params)