from django.conf import settings
from django.http import Http404, HttpResponseRedirect
from django.shortcuts import render, get_object_or_404
from django.views.generic import DetailView
from django.views.generic.edit import CreateView
from board.models import Post, Board
from board.forms import PostForm, ReplyForm

__all__ = ("BoardView", "PostView")


def get_client_ip(request):
    "Get the IP address of a client-side request. Shamelessly copy/pasted from StackOverflow."
    x_forwarded_for = request.META.get("HTTP_X_FORWARDED_FOR")
    if x_forwarded_for:
        ip = x_forwarded_for.split(",")[0]
    else:
        ip = request.META.get("REMOTE_ADDR")
    return ip


class CreatePostView(CreateView):
    """
    Helper class that sets a few variables for posts. This should not be used by itself.

    This class sets the following variables on GET and POST:
    * self.board
    """

    def get(self, request, *args, **kwargs):
        self._set_board(kwargs["url"])
        return super(CreatePostView, self).get(request, *args, **kwargs)

    def post(self, request, *args, **kwargs):
        self._set_board(kwargs["url"])
        return super(CreatePostView, self).post(request, *args, **kwargs)

    def _set_board(self, board_url: str):
        board = get_object_or_404(Board, url=board_url)
        self.board = board

    def get_form_kwargs(self):
        kwargs = super(CreatePostView, self).get_form_kwargs()
        kwargs["board"] = self.board
        kwargs["ip"] = get_client_ip(self.request)
        return kwargs


class BoardView(CreatePostView):
    model = Post
    form_class = PostForm
    # fields = ["subject", "name", "text", "image"]
    slug_field = "url"
    slug_url_kwarg = "url"
    template_name = "board/board_detail.html"

    def get_context_data(self, **kwargs):
        page = self.kwargs.get("page", 1)

        if page not in range(1, self.board.max_pages + 1):
            raise Http404()

        threads_per_page = self.board.threads_per_page
        start = (page - 1) * threads_per_page
        end = start + threads_per_page
        thread_count = self.board.threads.count()
        last_page = (thread_count // threads_per_page) + 1

        kwargs["board"] = self.board
        kwargs["threads"] = self.board.threads.order_by("-last_bump")[start:end]
        kwargs["current_page"] = page
        kwargs["pages"] = range(1, last_page + 1)
        kwargs["last_page"] = last_page
        kwargs["max_upload_size"] = settings.MAX_UPLOAD_SIZE

        return super(BoardView, self).get_context_data(**kwargs)


class PostView(CreatePostView):
    model = Post
    # fields = ["name", "text", "image"]
    form_class = ReplyForm
    slug_field = "url"
    slug_url_kwarg = "url"

    template_name = "board/post_detail.html"

    def get_context_data(self, **kwargs):
        kwargs["board"] = self.board
        post_id = self.kwargs["id"]
        kwargs["post"] = get_object_or_404(Post, id=post_id)
        kwargs["max_upload_size"] = settings.MAX_UPLOAD_SIZE

        return super(PostView, self).get_context_data(**kwargs)

    def get_form_kwargs(self):
        kwargs = super(PostView, self).get_form_kwargs()
        post_id = self.kwargs["id"]
        post = get_object_or_404(Post, id=post_id)
        kwargs["op"] = post
        kwargs["reply"] = post
        return kwargs