import logging

from django.conf import settings
from django.shortcuts import redirect
from django.utils import timezone
from django.views import View
from django.views.generic import DetailView, ListView

from .models import Camp

logger = logging.getLogger("bornhack.%s" % __name__)


class CampRedirectView(View):
    def dispatch(self, request, *args, **kwargs):
        now = timezone.now()

        try:
            camp = Camp.objects.get(camp__contains=now)
            logger.debug(
                "Redirecting to camp '%s' for page '%s' because it is now!"
                % (camp.slug, kwargs["page"])
            )
            return redirect(kwargs["page"], camp_slug=camp.slug)
        except Camp.DoesNotExist:
            pass

        # no ongoing camp, find the closest camp in the past
        try:
            prevcamp = (
                Camp.objects.filter(camp__endswith__lt=now).order_by("-camp").first()
            )
        except Camp.DoesNotExist:
            prevcamp = None

        # find the closest upcoming camp
        try:
            nextcamp = (
                Camp.objects.filter(camp__startswith__gt=now).order_by("camp").first()
            )
        except Camp.DoesNotExist:
            nextcamp = None

        percentpassed = False
        if prevcamp and nextcamp:
            # find the number of days between the two camps
            daysbetween = (nextcamp.camp.lower - prevcamp.camp.upper).days

            # find the number of days since the last camp ended
            dayssinceprevcamp = (timezone.now() - prevcamp.camp.lower).days

            # find the percentage of time passed
            percentpassed = (dayssinceprevcamp / daysbetween) * 100

        # figure out where to redirect
        if percentpassed > settings.CAMP_REDIRECT_PERCENT or not prevcamp:
            # either we have no previous camp, or we have both and more than settings.CAMP_REDIRECT_PERCENT has passed, so redirect to the next camp
            camp = nextcamp
        else:
            # either we have no next camp, or we have both and less than settings.CAMP_REDIRECT_PERCENT has passed, so redirect to the previous camp
            camp = prevcamp

        # do the redirect
        return redirect(kwargs["page"], camp_slug=camp.slug)


class CampDetailView(DetailView):
    model = Camp
    slug_url_kwarg = "camp_slug"

    def get_template_names(self):
        return "%s_camp_detail.html" % self.get_object().slug


class CampListView(ListView):
    model = Camp
    template_name = "camp_list.html"
    queryset = Camp.objects.all().order_by("camp")