'''
Created on Jun 23, 2010

@author: leifj
'''
from django.db import models
from django.contrib.auth.models import User
from coip.apps.name.models import Name, lookup
from django.core.mail import send_mail
import logging
from coip.settings import PREFIX_URL, NOREPLY
from coip.apps.scim.schema import scim_simple_attribute, ScimAttribute,\
    scim_reference_attribute
from coip.apps.scim import types
from coip.apps.resource.models import object_for_uuid
from coip.apps.auth.utils import nonce
from django.dispatch.dispatcher import receiver
from django.db.models.signals import post_save
from actstream.signals import action
from django.core.exceptions import ObjectDoesNotExist
from iso8601 import iso8601

class Invitation(models.Model):
    '''
    Invitation to a namespace/group
    '''
    inviter = models.ForeignKey(User,related_name='inviter')
    name = models.ForeignKey(Name,related_name='invitations')
    email = models.EmailField()
    message = models.TextField()
    nonce = models.CharField(unique=True,max_length=255)
    timecreated = models.DateTimeField(auto_now_add=True)
    lastupdated = models.DateTimeField(auto_now=True)
    expires = models.DateTimeField()
    
    def __unicode__(self):
        return "%s invited to %s by %s" % (self.email,self.name,self.inviter)
        
    def send_email(self):
        pinviter = self.inviter.get_profile()
        send_mail('Invitation to join \'%s\'' % (self.name.shortname()),
                  '''
%s (%s) has invited you to join \'%s\':

---
%s
---

If you want to accept the invitation open this link in your browser:
%s/invitation/%s/accept

To view information about \'%s\' open this link in your browser:
%s

''' % (pinviter.display_name,pinviter.identifier,self.name.shortname(),self.message,PREFIX_URL,self.nonce,self.name.shortname(),self.name.url()),
                  NOREPLY,
                  [self.email], 
                  fail_silently=False)
        return
        
try:
    from coip.apps.resource.models import resources
    resources.register(Invitation)
except ImportError:
    pass

@receiver(post_save,sender=Invitation)
def auto_create_resource(sender,**kwargs):
    if kwargs['created']:
        invitation = kwargs['instance']
        user = invitation.inviter
        invitation.send_email()
        action.send(user,verb='invited',target=invitation.name,action_object=invitation)

class InvitationSchema():
    URI = "uri:mace:swami.se:scim:schema:coip:1.0"
    ATTRIBUTES = ('mail','externalId','groupId','message','expires','userId')
    
    externalId = scim_simple_attribute('id')
    mail = scim_simple_attribute('email')
    groupId = scim_reference_attribute('name')
    message = scim_simple_attribute('message')
    expires = scim_simple_attribute('expires')
    userId = scim_reference_attribute('inviter')
    
    def create(self,model,d):
        user = None
        if d.has_key('userId'):
            user = object_for_uuid(d['userId'])
        elif d.has_key('userName'):
            try:
                user = User.objects.get(username=d['userName'])
            except ObjectDoesNotExist:
                pass
        
        if user == None:
            raise Exception("unspecified user")
        
        name = None
        if d.has_key('groupId'):
            name = object_for_uuid(d['groupId'])
        elif d.has_key('groupName'):
            name = lookup(d['groupName'])
            
        if name == None:
            raise Exception("unspecified group")
        
        expires = iso8601.parse_date(d['expires'])
        invitation,created = Invitation.objects.get_or_create(inviter=user,nonce=nonce(),name=name,email=d['mail'],expires=expires)
        return invitation
    
types.register(Invitation,"Invitations",[InvitationSchema()])