from django.shortcuts import render, redirect
from django.http import HttpResponse
from django.forms.models import ModelForm
from django.forms import TextInput

from .models import Event, EventParticipation

from .serializers import ParticipationSerializer

import datetime

from rest_framework.decorators import api_view
from rest_framework.response import Response
from rest_framework import status

from crispy_forms.helper import FormHelper
from crispy_forms.layout import Submit


# ---------------------------------------- API ---------------------------------------------------------


@api_view(['GET', 'PUT'])
def event_api(request, username=None, eventId=None):
    try:
        participationQs = EventParticipation.objects.filter(event__date__gte=datetime.date.today())
        if username:
            participationQs = EventParticipation.objects.filter(user__username=username)
        if eventId:
            participationQs = participationQs.filter(event__pk=eventId)
    except EventParticipation.DoesNotExist:
        return HttpResponse(status=404)

    if request.method == 'GET':
        serializer = ParticipationSerializer(participationQs)
        return Response(serializer.data)

    elif request.method == 'PUT':
        serializer = ParticipationSerializer(participationQs, data=request.DATA, many=True)
        if serializer.is_valid():
            for serializedObject in serializer.object:
                if not (EventParticipation.isMember(request.user) or EventParticipation.isAdmin(request.user)):
                    return Response(status=status.HTTP_403_FORBIDDEN)
                if serializedObject.user != request.user:
                    if not EventParticipation.isAdmin(request.user):
                        return Response(status=status.HTTP_403_FORBIDDEN)

            serializer.save()
            return Response(serializer.data)
        else:
            return Response(status=status.HTTP_400_BAD_REQUEST)


# ------------------------------------ Normal Views ----------------------------------------------------

def eventplanning(request):
    """
        View for a specific user, to edit his events
    """
    # non-members see the grid - but cannot edit anything
    if not EventParticipation.isMember(request.user):
        return events_grid(request)

    # All events in the future sorted by date
    all_future_events = list(Event.objects.filter(date__gte=datetime.date.today()).order_by('date'))

    for e in all_future_events:
        e.participation = EventParticipation.get_or_create(event=e, user=request.user)

    context = {'events': all_future_events}
    return render(request, 'eventplanner/eventplanning_view.html', context)


def events_grid(request):
    usernames = [u.username for u in EventParticipation.members()]

    all_future_events = list(Event.objects.filter(date__gte=datetime.date.today()).order_by('date'))

    for e in all_future_events:
        e.participation = [EventParticipation.get_or_create(event=e, user=u) for u in EventParticipation.members()]

    context = {'events': all_future_events,
               'usernames': usernames}

    return render(request, 'eventplanner/events_grid.html', context)


def deleteEvent(request, pk):
    Event.objects.get(pk=pk).delete()
    return redirect(events_grid)


# ------------------------------------ Detail Views ----------------------------------------------------


from django.views.generic.edit import UpdateView, CreateView

from location_field.widgets import LocationWidget


class EventForm(ModelForm):
    def __init__(self, *args, **kwargs):
        self.helper = FormHelper()
        self.helper.form_class = 'form-horizontal'
        self.helper.add_input(Submit('submit', 'Speichern'))
        return super(EventForm, self).__init__(*args, **kwargs)

    class Meta:
        model = Event
        fields = ['type', 'short_desc', 'date', 'end_date', 'time', 'meeting_time', 'location', 'map_location',
                  'desc', ]

        widgets = {
            'location': TextInput(),
            'map_location': LocationWidget(),
        }


class EventUpdate(UpdateView):
    form_class = EventForm
    model = Event
    template_name_suffix = "_update_form"
    success_url = '.'

    def get_context_data(self, **kwargs):
        context = super(UpdateView, self).get_context_data(**kwargs)
        context['viewtype'] = "update"
        return context


class EventCreate(CreateView):
    form_class = EventForm
    model = Event
    template_name_suffix = "_update_form"
    success_url = '.'

    def get_context_data(self, **kwargs):
        context = super(CreateView, self).get_context_data(**kwargs)
        context['viewtype'] = "create"
        return context