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

__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 BoardView(CreateView):
    model = Post
    fields = ["subject", "name", "text", "image"]
    slug_field = "url"
    slug_url_kwarg = "url"
    template_name = "board/board_detail.html"

    def get_context_data(self, **kwargs):
        board_url = self.kwargs["url"]
        board = get_object_or_404(Board, url=board_url)
        kwargs["board"] = board
        page = self.kwargs.get("page", 1)

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

        start = (page - 1) * board.threads_per_page
        end = start + board.threads_per_page
        kwargs["threads"] = board.threads.order_by("-last_bump")[start:end]
        kwargs["page"] = page
        kwargs["max_upload_size"] = settings.MAX_UPLOAD_SIZE

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

    def form_valid(self, form):
        board_url = self.kwargs["url"]
        board = get_object_or_404(Board, url=board_url)

        form.instance.board = board
        form.instance.ip = get_client_ip(self.request)

        self.object = form.save()
        return HttpResponseRedirect(self.get_success_url())


class PostView(CreateView):
    model = Post
    fields = ["name", "text", "image"]
    slug_field = "url"
    slug_url_kwarg = "url"

    template_name = "board/post_detail.html"

    def get_context_data(self, **kwargs):
        board_url = self.kwargs["url"]
        kwargs["board"] = get_object_or_404(Board, url=board_url)
        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 form_valid(self, form):
        board_url = self.kwargs["url"]
        board = get_object_or_404(Board, url=board_url)

        post_id = self.kwargs["id"]
        post = get_object_or_404(Post, id=post_id)

        form.instance.board = board
        form.instance.ip = get_client_ip(self.request)
        form.instance.op = post
        form.instance.reply = post

        self.object = form.save()

        return HttpResponseRedirect(post.get_absolute_url())