import json

from django.core.urlresolvers import reverse

from django.http import Http404, HttpResponse

from django.shortcuts import render, get_object_or_404, redirect

from django.template import loader, Context

from django.contrib.auth.decorators import login_required

from django.contrib.sites.models import Site

from symposion.schedule.models import Schedule, Day, Slot, Presentation

from symposion.schedule.timetable import TimeTable

def fetch_schedule(slug):

    qs = Schedule.objects.all()

    if slug is None:

        if qs.count() > 1:

            raise Http404()

        schedule = next(iter(qs), None)

        if schedule is None:

    ctx = {

        "schedule": schedule,

        "presentations": presentations,

    }

    return render(request, "schedule/schedule_list.html", ctx)

def schedule_list_csv(request, slug=None):

    schedule = fetch_schedule(slug)

    presentations = Presentation.objects.filter(section=schedule.section)

    presentations = presentations.exclude(cancelled=True).order_by("id")

    if slug:

        file_slug = slug

    else:

        file_slug = "presentations"

    response["Content-Disposition"] = 'attachment; filename="%s.csv"' % file_slug

    response.write(loader.get_template("schedule/schedule_list.csv").render(Context({

        "presentations": presentations,

    })))

    return response

@login_required

def schedule_edit(request, slug=None):

    if not request.user.is_staff:

        raise Http404()

    schedule = fetch_schedule(slug)

    days_qs = Day.objects.filter(schedule=schedule)

    days = [TimeTable(day) for day in days_qs]

    ctx = {

        "schedule": schedule,

        "days": days,

    }

    return render(request, "schedule/schedule_edit.html", ctx)

@login_required

def schedule_slot_edit(request, slug, slot_pk):

    if not request.user.is_staff:

        raise Http404()

    slot = get_object_or_404(Slot, day__schedule__section__slug=slug, pk=slot_pk)