"""
Views for the News application.
"""

import datetime
from django.shortcuts import render_to_response
from django.template import RequestContext
from django.template.loader import render_to_string
from django.http import HttpResponseRedirect
from django.contrib.auth.decorators import login_required
from django.shortcuts import get_object_or_404
from django.core.paginator import InvalidPage
from django.core.urlresolvers import reverse
from django.contrib.sites.models import Site
from django.http import Http404

from tagging.models import Tag
from tagging.models import TaggedItem

from core.html import clean_html
from core.functions import send_mail
from core.functions import get_full_name
from core.functions import get_page
from core.paginator import DiggPaginator
from news.models import Category
from news.models import Story
from news.forms import AddNewsForm
from news.forms import SendStoryForm
from news.utils import attach_extra_attrs


NEWS_PER_PAGE = 10

#######################################################################

def create_paginator(stories):
    return DiggPaginator(stories, NEWS_PER_PAGE, body=5, tail=3, margin=3, padding=2)

#######################################################################

def index(request):
    # Defer the tags field because we are going to get all the
    # tags out in 1 query later...
    stories = Story.objects.all().defer('tags').select_related()
    paginator = create_paginator(stories)

    page = get_page(request.GET)
    try:
        the_page = paginator.page(page)
    except InvalidPage:
        raise Http404

    # Go get the tags and comment counts for all these stories in bulk rather
    # than one at a time in the template; this saves database queries
    attach_extra_attrs(the_page.object_list)

    return render_to_response('news/index.html', {
        'title': 'Main Index',
        'page': the_page,
        },
        context_instance = RequestContext(request))

#######################################################################

def archive_index(request):
    dates = Story.objects.dates('date_submitted', 'month', order='DESC')
    return render_to_response('news/archive_index.html', {
        'title': 'News Archive',
        'dates': dates,
        },
        context_instance = RequestContext(request))

#######################################################################

def archive(request, year, month):
    stories = Story.objects.defer('tags').filter(date_submitted__year=year,
            date_submitted__month=month).select_related()
    paginator = create_paginator(stories)
    page = get_page(request.GET)
    try:
        the_page = paginator.page(page)
    except InvalidPage:
        raise Http404

    attach_extra_attrs(the_page.object_list)

    month_name = datetime.date(int(year), int(month), 1).strftime('%B')

    return render_to_response('news/index.html', {
        'title': 'Archive for %s, %s' % (month_name, year),
        'page': the_page,
        },
        context_instance = RequestContext(request))

#######################################################################

def category_index(request):
    categories = Category.objects.all().select_related()
    cat_list = []
    for cat in categories:
        cat_list.append((cat, cat.story_set.defer('tags')[:10]))

    return render_to_response('news/category_index.html', {
        'cat_list': cat_list,
        },
        context_instance = RequestContext(request))

#######################################################################

def category(request, slug):
    category = get_object_or_404(Category, slug=slug)
    stories = Story.objects.defer('tags').filter(category=category).select_related()
    paginator = create_paginator(stories)
    page = get_page(request.GET)
    try:
        the_page = paginator.page(page)
    except InvalidPage:
        raise Http404

    attach_extra_attrs(the_page.object_list)

    return render_to_response('news/index.html', {
        'title': 'Category: ' + category.title,
        'page': the_page,
        },
        context_instance = RequestContext(request))

#######################################################################

def story(request, story_id):
    story = get_object_or_404(Story, pk=story_id)
    return render_to_response('news/story.html', {
        'story': story,
        },
        context_instance=RequestContext(request))

#######################################################################

@login_required
def submit(request):
    if request.method == "POST":
        add_form = AddNewsForm(request.POST)
        if add_form.is_valid():
            pending_story = add_form.save(commit=False)
            pending_story.submitter = request.user
            pending_story.short_text = _clean_html(pending_story.short_text)
            pending_story.long_text = _clean_html(pending_story.long_text)
            pending_story.save()
            return HttpResponseRedirect(reverse('news.views.submit_thanks'))
    else:
        add_form = AddNewsForm()

    return render_to_response('news/submit_news.html', {
        'add_form': add_form,
        },
        context_instance = RequestContext(request))

#######################################################################

@login_required
def submit_thanks(request):
    return render_to_response('news/submit_news.html', {
        },
        context_instance = RequestContext(request))

#######################################################################

def tags(request):
    tags = Tag.objects.cloud_for_model(Story)
    return render_to_response('news/tag_index.html', {
        'tags': tags,
        },
        context_instance = RequestContext(request))

#######################################################################

def tag(request, tag_name):
    tag = get_object_or_404(Tag, name=tag_name)
    stories = TaggedItem.objects.get_by_model(
            Story.objects.defer('tags').select_related(), tag)
    paginator = create_paginator(stories)
    page = get_page(request.GET)
    try:
        the_page = paginator.page(page)
    except InvalidPage:
        raise Http404

    attach_extra_attrs(the_page.object_list)

    return render_to_response('news/index.html', {
        'title': 'Stories with tag: "%s"' % tag_name,
        'page': the_page,
        },
        context_instance=RequestContext(request))

#######################################################################

@login_required
def email_story(request, story_id):
    story = get_object_or_404(Story, pk=story_id)
    if request.method == 'POST':
        send_form = SendStoryForm(request.POST)
        if send_form.is_valid():
            to_name = send_form.name()
            to_email = send_form.email()
            from_name = get_full_name(request.user)
            from_email = request.user.email
            site = Site.objects.get_current()

            msg = render_to_string('news/send_story_email.txt',
                    {
                        'to_name': to_name,
                        'sender_name': from_name,
                        'site_name' : site.name,
                        'site_url' : site.domain,
                        'story_title': story.title,
                        'story_link': story.get_absolute_url(),
                    })

            subject = 'Interesting Story at ' + site.name
            send_mail(subject, msg, from_email, [to_email])
            return HttpResponseRedirect(reverse('news.views.email_thanks'))
    else:
        send_form = SendStoryForm()

    return render_to_response('news/send_story.html', {
        'send_form': send_form,
        'story': story,
        },
        context_instance = RequestContext(request))

#######################################################################

@login_required
def email_thanks(request):
    return render_to_response('news/send_story.html', {
        },
        context_instance = RequestContext(request))

#######################################################################

def _clean_html(s):
    return clean_html(s, profile='news')