from django.contrib.admin.views.decorators import staff_member_required
from django.shortcuts import redirect, render, get_object_or_404
from django.db.models.functions import TruncDate
from django.db.models import Count
from django.views import generic
from django.conf import settings
from django.urls import reverse
from django.http import Http404
from nsfw import views as nsfw
from .models import LogSource, LogEntry
from .forms import SearchForm
from utils import is_link_legit
import datetime


def chat_view(request):
    ctx = {
        "debug": settings.DEBUG,
        "bosh_url": settings.KHAGANAT_XMPP_BOSH_URL,
        "jid": settings.KHAGANAT_XMPP_JID,
        "rooms": settings.KHAGANAT_XMPP_ROOMS,
        "websocket_url": settings.KHAGANAT_XMPP_WEBSOCKET_URL,
    }
    return render(request, "chat/chat_conversejs.html", ctx)


def _get_dates():
    now = datetime.date.today()
    start_date = now - datetime.timedelta(days=settings.KHAGANAT_LOGS_MAX_DAYS)
    end_date = now - datetime.timedelta(days=settings.KHAGANAT_LOGS_MIN_DAYS - 1)
    return (now, start_date, end_date)


def _switch_hidden(request, obj, pk):
    e = get_object_or_404(obj, pk=pk)
    e.hidden = not e.hidden
    e.save()

    next_page = request.GET.get("next", "/")
    if not is_link_legit(next_page):
        next_page = reverse("log_index")
    return redirect(next_page)


@staff_member_required(login_url="login")
def switch_log_source(request, pk):
    return _switch_hidden(request, LogSource, pk)


@staff_member_required(login_url="login")
def switch_log_entry(request, pk):
    return _switch_hidden(request, LogEntry, pk)


def log_search_view(request):
    if request.method == "POST":
        form = SearchForm(request.POST)
        if form.is_valid():
            date = form.cleaned_data["date"]
            return redirect(
                reverse(
                    "log_day",
                    kwargs={
                        "source": form.cleaned_data["source"],
                        "year": date.year,
                        "month": date.month,
                        "day": date.day,
                    },
                )
            )
    raise Http404("No search parameters.")


class LogEntriesView(generic.ListView):
    template_name = "chat/entries.html"
    context_object_name = "entries"
    filter_nsfw = False

    def is_nsfw(self):
        for e in self.get_queryset():
            for tag in settings.KHAGANAT_NSFW_TAGS:
                if tag.lower() in e.content.lower():
                    return True
        return False

    def dispatch(self, request, *args, **kwargs):
        if self.is_nsfw():
            if not nsfw.is_nsfw_allowed(request):
                self.filter_nsfw = True
            else:
                nsfw.alert(request, request.get_full_path())
        return super().dispatch(request, *args, **kwargs)

    def get_date(self):
        """Return the date object corresponding to the URL parameters
        or None if missing.
        """
        has_date = all(
            [
                self.kwargs.get("year") is not None,
                self.kwargs.get("month") is not None,
                self.kwargs.get("day") is not None,
            ]
        )
        if not has_date:
            return None
        return datetime.date(
            self.kwargs["year"], self.kwargs["month"], self.kwargs["day"]
        )

    def get_dates(self, source):
        """Return a list if available dates for the current source."""
        _, start_date, end_date = _get_dates()
        if source is None:
            return []

        nb_max = settings.KHAGANAT_LOGS_MAX_DAYS
        nb_max -= settings.KHAGANAT_LOGS_MIN_DAYS
        lst = LogEntry.objects.filter(source=source)
        if not self.request.user.is_staff:
            lst = lst.filter(hidden=False, created__range=(start_date, end_date))
        lst = (
            lst.annotate(date=TruncDate("created"))
            .values("date")
            .annotate(nb=Count("date"))
            .order_by("-date")[:nb_max]
        )
        return [o["date"] for o in lst]

    def get_source(self):
        """Return the current source."""
        if self.kwargs.get("source") is None:
            return None
        return LogSource.objects.get(slug=self.kwargs["source"])

    def get_sources(self):
        """Return available sources."""
        now, start_date, end_date = _get_dates()
        qs = LogEntry.objects.all()

        if not self.request.user.is_staff:
            qs = qs.filter(
                hidden=False,
                source__hidden=False,
                created__range=(start_date, end_date),
            )
        qs = qs.values(
            "source", "source__name", "source__slug", "source__id", "source__hidden"
        ).annotate(nb=Count("id"))

        out = []
        for src in qs:
            dts = self.get_dates(src["source"])
            src["first_date"] = dts[0] if dts else None
            out.append(src)

        return out

    def get_context_data(self, **kwargs):
        context = super().get_context_data(**kwargs)
        context["form"] = SearchForm()
        context["sources"] = self.get_sources()
        context["current_source"] = self.get_source()
        context["dates"] = self.get_dates(context["current_source"])
        context["current_date"] = self.get_date()
        context["filter_nsfw"] = self.filter_nsfw
        context["current_url"] = self.request.get_full_path()
        return context

    def get_queryset(self):
        """Return the entries to be displayed."""
        dt = self.get_date()
        if dt is None:
            return []

        is_staff = self.request.user.is_staff
        now = datetime.date.today()
        out_of_bounds = any(
            (
                (now - dt).days > settings.KHAGANAT_LOGS_MAX_DAYS,
                (now - dt).days < settings.KHAGANAT_LOGS_MIN_DAYS,
            )
        )
        if out_of_bounds and not is_staff:
            return LogEntry.objects.none()
        src = self.get_source()
        if src is None:
            return LogEntry.objects.none()
        if src.hidden and not is_staff:
            return LogEntry.objects.none()
        qs = (
            LogEntry.objects.filter(source=src, created__year=dt.year)
            .filter(created__month=dt.month)
            .filter(created__day=dt.day)
        )
        if not is_staff:
            qs = qs.filter(hidden=False)
        return qs.order_by("created")