from django.core.exceptions import ObjectDoesNotExist
from django.http import Http404
from django.shortcuts import get_object_or_404, render, redirect
from django.urls import reverse
from django.utils.decorators import method_decorator
from django.views.decorators.csrf import csrf_protect
from django.views.generic.edit import FormMixin

from boards import utils
from boards.abstracts.settingsmanager import get_settings_manager
from boards.forms import PostForm, PlainErrorList
from boards.models import Post
from boards.views.base import BaseBoardView, CONTEXT_FORM
from boards.views.mixins import DispatcherMixin, PARAMETER_METHOD
from boards.views.posting_mixin import PostMixin

REQ_POST_ID = 'post_id'

CONTEXT_LASTUPDATE = "last_update"
CONTEXT_THREAD = 'thread'
CONTEXT_MODE = 'mode'
CONTEXT_OP = 'opening_post'
CONTEXT_FAVORITE = 'is_favorite'
CONTEXT_RSS_URL = 'rss_url'

FORM_TITLE = 'title'
FORM_TEXT = 'text'
FORM_IMAGE = 'image'
FORM_THREADS = 'threads'


class ThreadView(BaseBoardView, PostMixin, FormMixin, DispatcherMixin):

    @method_decorator(csrf_protect)
    def get(self, request, post_id, form: PostForm=None):
        try:
            opening_post = Post.objects.get(id=post_id)
        except ObjectDoesNotExist:
            raise Http404

        # If the tag is favorite, update the counter
        settings_manager = get_settings_manager(request)
        favorite = settings_manager.thread_is_fav(opening_post)
        if favorite:
            settings_manager.add_or_read_fav_thread(opening_post)

        # If this is not OP, don't show it as it is
        if not opening_post.is_opening():
            return redirect('{}#{}'.format(opening_post.get_thread().get_opening_post()
                            .get_absolute_url(), opening_post.id))

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

        thread_to_show = opening_post.get_thread()

        params = dict()

        params[CONTEXT_FORM] = form
        params[CONTEXT_LASTUPDATE] = str(thread_to_show.last_edit_time)
        params[CONTEXT_THREAD] = thread_to_show
        params[CONTEXT_MODE] = self.get_mode()
        params[CONTEXT_OP] = opening_post
        params[CONTEXT_FAVORITE] = favorite
        params[CONTEXT_RSS_URL] = self.get_rss_url(post_id)

        params.update(self.get_data(thread_to_show))

        return render(request, self.get_template(), params)

    @method_decorator(csrf_protect)
    def post(self, request, post_id):
        opening_post = get_object_or_404(Post, id=post_id)

        # If this is not OP, don't show it as it is
        if not opening_post.is_opening():
            raise Http404

        if PARAMETER_METHOD in request.POST:
            self.dispatch_method(request, opening_post)

            return redirect('thread', post_id)  # FIXME Different for different modes

        if not opening_post.get_thread().is_archived():
            form = PostForm(request.POST, request.FILES,
                            error_class=PlainErrorList)
            form.session = request.session

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

            return self.get(request, post_id, form)

    def new_post(self, request, form: PostForm, opening_post: Post=None,
                 html_response=True):
        """
        Adds a new post (in thread or as a reply).
        """

        ip = utils.get_client_ip(request)

        data = form.cleaned_data

        title = form.get_title()
        text = data[FORM_TEXT]
        files = form.get_files()
        file_urls = form.get_file_urls()
        images = form.get_images()

        text = self._remove_invalid_links(text)

        post_thread = opening_post.get_thread()

        post = Post.objects.create_post(title=title, text=text, files=files,
                                        thread=post_thread, ip=ip,
                                        tripcode=form.get_tripcode(),
                                        images=images, file_urls=file_urls)

        if form.is_subscribe():
            settings_manager = get_settings_manager(request)
            settings_manager.add_or_read_fav_thread(
                    post_thread.get_opening_post())

        if html_response:
            if opening_post:
                return redirect(post.get_absolute_url())
        else:
            return post

    def get_data(self, thread) -> dict:
        """
        Returns context params for the view.
        """

        return dict()

    def get_template(self) -> str:
        """
        Gets template to show the thread mode on.
        """

        pass

    def get_mode(self) -> str:
        pass

    def subscribe(self, request, opening_post):
        settings_manager = get_settings_manager(request)
        settings_manager.add_or_read_fav_thread(opening_post)

    def unsubscribe(self, request, opening_post):
        settings_manager = get_settings_manager(request)
        settings_manager.del_fav_thread(opening_post)

    def get_rss_url(self, opening_id):
        return reverse('thread', kwargs={'post_id': opening_id}) + 'rss/'