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.auth.models import User
from django.contrib import messages
from django.contrib.sites.models import Site

from symposion.schedule.forms import SlotEditForm, ScheduleSectionForm
from symposion.schedule.models import Schedule, Day, Slot, Presentation, Session, SessionRole
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:
            raise Http404()
    else:
        schedule = get_object_or_404(qs, section__slug=slug)

    return schedule


def schedule_conference(request):

    schedules = Schedule.objects.filter(published=True, hidden=False)

    sections = []
    for schedule in schedules:
        days_qs = Day.objects.filter(schedule=schedule)
        days = [TimeTable(day) for day in days_qs]
        sections.append({
            "schedule": schedule,
            "days": days,
        })

    ctx = {
        "sections": sections,
    }
    return render(request, "schedule/schedule_conference.html", ctx)


def schedule_detail(request, slug=None):

    schedule = fetch_schedule(slug)
    if not schedule.published and not request.user.is_staff:
        raise Http404()

    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_detail.html", ctx)


def schedule_list(request, slug=None):
    schedule = fetch_schedule(slug)

    presentations = Presentation.objects.filter(section=schedule.section)
    presentations = presentations.exclude(cancelled=True)

    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")
    response = HttpResponse(content_type="text/csv")

    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)

    if request.method == "POST":
        form = ScheduleSectionForm(
            request.POST, request.FILES, schedule=schedule
        )
        if form.is_valid():
            if 'submit' in form.data:
                msg = form.build_schedule()
            elif 'delete' in form.data:
                msg = form.delete_schedule()
            messages.add_message(request, msg[0], msg[1])
    else:
        form = ScheduleSectionForm(schedule=schedule)
    days_qs = Day.objects.filter(schedule=schedule)
    days = [TimeTable(day) for day in days_qs]
    ctx = {
        "schedule": schedule,
        "days": days,
        "form": form
    }
    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)

    if request.method == "POST":
        form = SlotEditForm(request.POST, slot=slot)
        if form.is_valid():
            save = False
            if "content_override" in form.cleaned_data:
                slot.content_override = form.cleaned_data["content_override"]
                save = True
            if "presentation" in form.cleaned_data:
                presentation = form.cleaned_data["presentation"]
                if presentation is None:
                    slot.unassign()
                else:
                    slot.assign(presentation)
            if save:
                slot.save()
        return redirect("schedule_edit", slug)
    else:
        form = SlotEditForm(slot=slot)
        ctx = {
            "slug": slug,
            "form": form,
            "slot": slot,
        }
        return render(request, "schedule/_slot_edit.html", ctx)


def schedule_presentation_detail(request, pk):

    presentation = get_object_or_404(Presentation, pk=pk)
    if presentation.slot:
        schedule = presentation.slot.day.schedule
    else:
        schedule = None

    ctx = {
        "presentation": presentation,
        "schedule": schedule,
    }
    return render(request, "schedule/presentation_detail.html", ctx)


def schedule_json(request):
    slots = Slot.objects.filter(
        day__schedule__published=True,
        day__schedule__hidden=False
    ).order_by("start")

    protocol = request.META.get('HTTP_X_FORWARDED_PROTO', 'http')
    data = []
    for slot in slots:
        slot_data = {
            "room": ", ".join(room["name"] for room in slot.rooms.values()),
            "rooms": [room["name"] for room in slot.rooms.values()],
            "start": slot.start_datetime.isoformat(),
            "end": slot.end_datetime.isoformat(),
            "duration": slot.length_in_minutes,
            "kind": slot.kind.label,
            "section": slot.day.schedule.section.slug,
            "conf_key": slot.pk,
            # TODO: models should be changed.
            # these are model features from other conferences that have forked symposion
            # these have been used almost everywhere and are good candidates for
            # base proposals
            "license": "CC BY",
            "tags": "",
            "released": True,
            "contact": [],


        }
        if hasattr(slot.content, "proposal"):
            slot_data.update({
                "name": slot.content.title,
                "authors": [s.name for s in slot.content.speakers()],
                "contact": [
                    s.email for s in slot.content.speakers()
                ] if request.user.is_staff else ["redacted"],
                "abstract": slot.content.abstract.raw,
                "description": slot.content.description.raw,
                "conf_url": "%s://%s%s" % (
                    protocol,
                    Site.objects.get_current().domain,
                    reverse("schedule_presentation_detail", args=[slot.content.pk])
                ),
                "cancelled": slot.content.cancelled,
            })
        else:
            slot_data.update({
                "name": slot.content_override.raw if slot.content_override else "Slot",
            })
        data.append(slot_data)

    return HttpResponse(
        json.dumps({'schedule': data}),
        content_type="application/json"
    )


def session_list(request):
    sessions = Session.objects.all().order_by('pk')

    return render(request, "schedule/session_list.html", {
        "sessions": sessions,
    })


@login_required
def session_staff_email(request):

    if not request.user.is_staff:
        return redirect("schedule_session_list")

    data = "\n".join(user.email for user in User.objects.filter(sessionrole__isnull=False).distinct())

    return HttpResponse(data, content_type="text/plain;charset=UTF-8")


def session_detail(request, session_id):

    session = get_object_or_404(Session, id=session_id)

    chair = None
    chair_denied = False
    chairs = SessionRole.objects.filter(session=session, role=SessionRole.SESSION_ROLE_CHAIR).exclude(status=False)
    if chairs:
        chair = chairs[0].user
    else:
        if request.user.is_authenticated():
            # did the current user previously try to apply and got rejected?
            if SessionRole.objects.filter(session=session, user=request.user, role=SessionRole.SESSION_ROLE_CHAIR, status=False):
                chair_denied = True

    runner = None
    runner_denied = False
    runners = SessionRole.objects.filter(session=session, role=SessionRole.SESSION_ROLE_RUNNER).exclude(status=False)
    if runners:
        runner = runners[0].user
    else:
        if request.user.is_authenticated():
            # did the current user previously try to apply and got rejected?
            if SessionRole.objects.filter(session=session, user=request.user, role=SessionRole.SESSION_ROLE_RUNNER, status=False):
                runner_denied = True

    if request.method == "POST" and request.user.is_authenticated():
        if not hasattr(request.user, "profile") or not request.user.profile.is_complete:
            response = redirect("profile_edit")
            response["Location"] += "?next=%s" % request.path
            return response

        role = request.POST.get("role")
        if role == "chair":
            if chair is None and not chair_denied:
                SessionRole(session=session, role=SessionRole.SESSION_ROLE_CHAIR, user=request.user).save()
        elif role == "runner":
            if runner is None and not runner_denied:
                SessionRole(session=session, role=SessionRole.SESSION_ROLE_RUNNER, user=request.user).save()
        elif role == "un-chair":
            if chair == request.user:
                session_role = SessionRole.objects.filter(session=session, role=SessionRole.SESSION_ROLE_CHAIR, user=request.user)
                if session_role:
                    session_role[0].delete()
        elif role == "un-runner":
            if runner == request.user:
                session_role = SessionRole.objects.filter(session=session, role=SessionRole.SESSION_ROLE_RUNNER, user=request.user)
                if session_role:
                    session_role[0].delete()

        return redirect("schedule_session_detail", session_id)

    return render(request, "schedule/session_detail.html", {
        "session": session,
        "chair": chair,
        "chair_denied": chair_denied,
        "runner": runner,
        "runner_denied": runner_denied,
    })