from datetime import datetime
from datetime import timedelta

from django.db.models import Count, Q
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, Tag, STATUS_ACTIVE, TagAlias
from boards.settings import SECTION_VIEW
from boards.views.base import BaseBoardView
from boards.abstracts.settingsmanager import get_settings_manager,\
        SETTING_ONLY_FAVORITES

PARAM_SECTION_STR = 'section_str'
PARAM_LATEST_THREADS = 'latest_threads'
PARAM_LATEST_POSTS = 'latest_posts'

TEMPLATE = 'boards/landing.html'


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(Q(aliases__in=TagAlias.objects.filter_localized()) & Q(required=True))
                    .order_by('aliases__name'))

        today = datetime.now() - timedelta(1)
        ops = Post.objects.filter(thread__replies__pub_time__gt=today, opening=True, thread__status=STATUS_ACTIVE)

        fav_tags = self._get_fav_tags(request)
        if len(fav_tags) > 0:
            ops = ops.filter(thread__tags__in=fav_tags)

        ops = ops.annotate(today_post_count=Count('thread__replies'))\
                 .order_by('-pub_time')


        max_landing_threads = settings.get_int(SECTION_VIEW, 'MaxLandingThreads')
        if max_landing_threads > 0:
            ops = ops[:max_landing_threads]

        params[PARAM_LATEST_THREADS] = ops

        max_landing_posts = settings.get_int(SECTION_VIEW, 'MaxLandingPosts')
        latest_posts = Post.objects.filter(pub_time__gt=today)
        if len(fav_tags) > 0:
            latest_posts = latest_posts.filter(thread__tags__in=fav_tags)
        params[PARAM_LATEST_POSTS] = latest_posts\
                .order_by('-pub_time')[:max_landing_posts]

        return render(request, TEMPLATE, params)

    def _get_fav_tags(self, request):
        fav_tags = []
        settings_manager = get_settings_manager(request)
        if settings_manager.get_setting(SETTING_ONLY_FAVORITES):
            fav_tags = settings_manager.get_fav_tags()
        return fav_tags