from django.core.urlresolvers import reverse
from django.core.files import File
from django.core.files.temp import NamedTemporaryFile
from django.core.paginator import EmptyPage
from django.db import transaction
from django.http import Http404
from django.shortcuts import render, redirect
import requests

from boards import utils, settings
from boards.abstracts.paginator import get_paginator
from boards.abstracts.settingsmanager import get_settings_manager
from boards.models import Post, Thread, Ban, Tag, PostImage, Banner
from boards.views.base import BaseBoardView
from boards.views.posting_mixin import PostMixin


PARAMETER_CURRENT_PAGE = 'current_page'
PARAMETER_PAGINATOR = 'paginator'
PARAMETER_POSTS = 'posts'

PARAMETER_PREV_LINK = 'prev_page_link'
PARAMETER_NEXT_LINK = 'next_page_link'

TEMPLATE = 'boards/feed.html'
DEFAULT_PAGE = 1


class FeedView(PostMixin, BaseBoardView):

    def get(self, request, page=DEFAULT_PAGE):
        params = self.get_context_data(request=request)

        settings_manager = get_settings_manager(request)

        paginator = get_paginator(Post.objects
                .exclude(threads__tags__in=settings_manager.get_hidden_tags())
                .order_by('-pub_time')
                .prefetch_related('images', 'thread', 'threads'), 10)
        paginator.current_page = int(page)

        params[PARAMETER_POSTS] = paginator.page(page).object_list

        self.get_page_context(paginator, params, page)

        return render(request, TEMPLATE, params)

    # TODO Dedup this into PagedMixin
    def get_page_context(self, paginator, params, page):
        """
        Get pagination context variables
        """

        params[PARAMETER_PAGINATOR] = paginator
        current_page = paginator.page(int(page))
        params[PARAMETER_CURRENT_PAGE] = current_page
        if current_page.has_previous():
            params[PARAMETER_PREV_LINK] = self.get_previous_page_link(
                    current_page)
        if current_page.has_next():
            params[PARAMETER_NEXT_LINK] = self.get_next_page_link(current_page)

    def get_previous_page_link(self, current_page):
        return reverse('feed', kwargs={
            'page': current_page.previous_page_number(),
        })

    def get_next_page_link(self, current_page):
        return reverse('feed', kwargs={
            'page': current_page.next_page_number(),
        })