from django.core.exceptions import ObjectDoesNotExist
from django.http import Http404
from django.shortcuts import get_object_or_404, render, redirect
from django.views.generic.edit import FormMixin

from boards import utils, settings
from boards.forms import PostForm, PlainErrorList
from boards.models import Post
from boards.views.base import BaseBoardView, CONTEXT_FORM
from boards.views.posting_mixin import PostMixin
import neboard


CONTEXT_LASTUPDATE = "last_update"
CONTEXT_THREAD = 'thread'
CONTEXT_WS_TOKEN = 'ws_token'
CONTEXT_WS_PROJECT = 'ws_project'
CONTEXT_WS_HOST = 'ws_host'
CONTEXT_WS_PORT = 'ws_port'

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


class ThreadView(BaseBoardView, PostMixin, FormMixin):

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

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

        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(utils.datetime_to_epoch(
            thread_to_show.last_edit_time))
        params[CONTEXT_THREAD] = thread_to_show

        if settings.WEBSOCKETS_ENABLED:
            params[CONTEXT_WS_TOKEN] = utils.get_websocket_token(
                timestamp=params[CONTEXT_LASTUPDATE])
            params[CONTEXT_WS_PROJECT] = neboard.settings.CENTRIFUGE_PROJECT_ID
            params[CONTEXT_WS_HOST] = request.get_host().split(':')[0]
            params[CONTEXT_WS_PORT] = neboard.settings.CENTRIFUGE_PORT

        params.update(self.get_data(thread_to_show))

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

    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 not opening_post.get_thread().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 = data[FORM_TITLE]
        text = data[FORM_TEXT]
        image = form.get_image()

        text = self._remove_invalid_links(text)

        post_thread = opening_post.get_thread()

        post = Post.objects.create_post(title=title, text=text, image=image,
                                        thread=post_thread, ip=ip)
        post.send_to_websocket(request)

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

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

        pass

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

        pass