from django.shortcuts import render, get_object_or_404, redirect
from django.http import HttpResponse
from django.contrib.auth.decorators import login_required
from django.forms.models import ModelForm
from django.forms import TextInput

from models import Event, EventParticipation
from musicians.models import Musician

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( musician__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 serializedObject.musician.user != request.user:
                    if not request.user.has_perm('change_others_participation') :
                        return Response( status = status.HTTP_403_FORBIDDEN )
            
            serializer.save()
            return Response( serializer.data )
        else:
            return Response( status = status.HTTP_400_BAD_REQUEST )



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

@login_required
def main_view( request ):
    if request.user.has_perm( 'eventplanner.change_others_participation'):
        return events_grid( request )
    else:
        return eventplanning( request )
    
@login_required
def eventplanning( request ):
    """
        View for a specific user, to edit his events
    """
    # All events in the future sorted by date
    all_future_events = list ( Event.objects.filter( date__gte = datetime.date.today() ) )
    
    
    musician = get_object_or_404( Musician, user=request.user )
    
    for e in all_future_events:
        e.participation = EventParticipation.get_or_create( event = e, musician = musician )
        
    context = { 'events' : all_future_events }
    return render ( request, 'eventplanner/eventplanning_view.html', context )

    

@login_required
def events_grid( request ):
    
    musicians     = Musician.objects.all()
    musicianNames = [ m.user.username for m in musicians  ]
    
    
    all_future_events = list ( Event.objects.filter( date__gte = datetime.date.today() ) )

    for e in all_future_events:
        e.participation = [ EventParticipation.get_or_create( event = e, musician = m ) for m in musicians ]
    
    context = { 'events':         all_future_events, 
                'musicianNames' : musicianNames     }
    return render ( request, 'eventplanner/events_grid.html', context )



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

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


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


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= ['title', 'type', 'date','time', 'meeting_time', 'location', 'desc',  ]
        
        widgets = {
            'location': TextInput(),
        }
        

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


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