from django.db import models
from django.utils.translation import ugettext as _
from django.contrib.auth.models import User



from datetime import datetime
from location_field.models import PlainLocationField


class Event ( models.Model ):
    
    EVENT_TYPES = (
        ( 'Reh',    _('Rehearsal') ),
        ( 'Conc',   _('Concert') ),
        ( 'GenReh', _('General Rehearsal') ),
        ( 'Party',  _('Party') ),
    )
    
    title         = models.CharField( max_length=40, verbose_name = _("titel") )
    type          = models.CharField( max_length=6, choices=EVENT_TYPES, default='Reh', verbose_name= _("type") )
    location      = models.TextField( blank=False, verbose_name=_("location") )    
    map_location  = PlainLocationField( based_field = location, zoom=7 )
    desc          = models.TextField( blank=True, verbose_name=_("description"))    

    date          = models.DateField( verbose_name= _("date") )
    time          = models.TimeField( null=True, blank=True, verbose_name = _("time") )
    meeting_time  = models.TimeField( null=True, blank=True, verbose_name = _("meeting_time") )
    
    participants  = models.ManyToManyField( User, through='EventParticipation', verbose_name=_("participants") )
    
    def __unicode__(self):
        return self.title + " ( " + self.get_type_display() + " ) "


    def save(self, *args, **kwargs):
        # Call the "real" save() method
        super(Event, self).save(*args, **kwargs)
        
        # Create a  "Don't Know" participation for each Musician
        for u in  User.objects.all():
            if not u in self.participants.all():
                EventParticipation.objects.create( event=self, user = u, status='?', comment = '' )
    
    @property
    def displaytime(self):
        if self.meeting_time is None or self.meeting_time == "":
            return self.time
        else:
            return self.meeting_time          
        


    
class EventParticipation( models.Model ):
    OPTIONS = ( ('?'  , _('?'  )),
                ('Yes', _('Yes')),
                ('No' , _('No' ))
            )
    
    event     = models.ForeignKey( Event, verbose_name=_("event") )
    user      = models.ForeignKey( User, verbose_name=_("user") )
    status    = models.CharField ( max_length=3, choices = OPTIONS, default='?', verbose_name=_("status") )
    comment   = models.CharField ( max_length=64, blank=True, verbose_name=_("comment") )
    
    def get_username(self):
        return self.user.username
    
    @staticmethod
    def hasUserSetParticipationForAllEvents( user ):
        futurePart = EventParticipation.objects.filter( event__date__gte = datetime.now() )

        maybeObjects = futurePart.filter( user = user ).filter( status = '?' )
        if len( maybeObjects ) > 0:
            return False
        else:
            return True
    
    
    @staticmethod
    def get_or_create(  user , event ):
        try:
            result = EventParticipation.objects.get( event = event, user = user )
        except EventParticipation.DoesNotExist:
            result = EventParticipation.objects.create( event = event, user = user, status='?', comment = '' )
        
        return result
    
    class Meta:
        unique_together = ("event", "user")
        permissions = (
            ("change_others_participation", _("Can modify participation status of other users") ),
        )