import string

from django.core.paginator import Paginator
from django.core.urlresolvers import reverse
from django.db import transaction
from django.shortcuts import render, redirect

from boards import utils
from boards.forms import ThreadForm, PlainErrorList
from boards.models import Post, Thread, Ban, Tag
from boards.views.banned import BannedView
from boards.views.base import BaseBoardView, PARAMETER_FORM
from boards.views.posting_mixin import PostMixin
import neboard

PARAMETER_CURRENT_PAGE = 'current_page'

PARAMETER_PAGINATOR = 'paginator'

PARAMETER_THREADS = 'threads'

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


class AllThreadsView(PostMixin, BaseBoardView):

    def get(self, request, page=DEFAULT_PAGE, form=None):
        context = self.get_context_data(request=request)

        if not form:
            form = ThreadForm(error_class=PlainErrorList)

        paginator = Paginator(self.get_threads(),
                              neboard.settings.THREADS_PER_PAGE)

        threads = paginator.page(page).object_list

        context[PARAMETER_THREADS] = threads
        context[PARAMETER_FORM] = form

        self._get_page_context(paginator, context, page)

        return render(request, TEMPLATE, context)

    def post(self, request, page=DEFAULT_PAGE):
        context = self.get_context_data(request=request)

        form = ThreadForm(request.POST, request.FILES,
                          error_class=PlainErrorList)
        form.session = request.session

        if form.is_valid():
            return self._new_post(request, form)
        if form.need_to_ban:
            # Ban user because he is suspected to be a bot
            self._ban_current_user(request)

        return self.get(request, page, form)

    @staticmethod
    def _get_page_context(paginator, context, page):
        """
        Get pagination context variables
        """

        context[PARAMETER_PAGINATOR] = paginator
        context[PARAMETER_CURRENT_PAGE] = paginator.page(int(page))

    # TODO This method should be refactored
    @transaction.atomic
    def _new_post(self, request, form, opening_post=None, html_response=True):
        """
        Add a new thread opening post.
        """

        ip = utils.get_client_ip(request)
        is_banned = Ban.objects.filter(ip=ip).exists()

        if is_banned:
            if html_response:
                return redirect(BannedView().as_view())
            else:
                return

        data = form.cleaned_data

        title = data['title']
        text = data['text']

        text = self._remove_invalid_links(text)

        if 'image' in data.keys():
            image = data['image']
        else:
            image = None

        tags = []

        tag_strings = data['tags']

        if tag_strings:
            tag_strings = tag_strings.split(' ')
            for tag_name in tag_strings:
                tag_name = string.lower(tag_name.strip())
                if len(tag_name) > 0:
                    tag, created = Tag.objects.get_or_create(name=tag_name)
                    tags.append(tag)

        post = Post.objects.create_post(title=title, text=text, ip=ip,
                                        image=image, tags=tags,
                                        user=self._get_user(request))

        thread_to_show = (opening_post.id if opening_post else post.id)

        if html_response:
            if opening_post:
                return redirect(
                    reverse('thread', kwargs={'post_id': thread_to_show}) +
                    '#' + str(post.id))
            else:
                return redirect('thread', post_id=thread_to_show)

    def get_threads(self):
        return Thread.objects.filter(archived=False)