import os
import datetime
from collections import defaultdict
from django.db import models
from core.models import PlCoreBase
from core.models import Site
from django.contrib.auth.models import AbstractBaseUser, BaseUserManager
from timezones.fields import TimeZoneField

# Create your models here.
class UserManager(BaseUserManager):
    def create_user(self, email, firstname, lastname, password=None):
        """
        Creates and saves a User with the given email, date of
        birth and password.
        """
        if not email:
            raise ValueError('Users must have an email address')

        user = self.model(
            email=UserManager.normalize_email(email),
            firstname=firstname,
            lastname=lastname,
            password=password
        )
        #user.set_password(password)
        user.is_admin = True
        user.save(using=self._db)
        return user

    def create_superuser(self, email, firstname, lastname, password):
        """
        Creates and saves a superuser with the given email, date of
        birth and password.
        """
        user = self.create_user(email,
            password=password,
            firstname=firstname,
            lastname=lastname
        )
        user.is_admin = True
        user.save(using=self._db)
        return user


class User(AbstractBaseUser):

    class Meta:
        app_label = "core"

    email = models.EmailField(
        verbose_name='email address',
        max_length=255,
        unique=True,
        db_index=True,
    )

    kuser_id = models.CharField(null=True, blank=True, help_text="keystone user id", max_length=200) 
    firstname = models.CharField(help_text="person's given name", max_length=200)
    lastname = models.CharField(help_text="person's surname", max_length=200)

    phone = models.CharField(null=True, blank=True, help_text="phone number contact", max_length=100)
    user_url = models.URLField(null=True, blank=True)
    site = models.ForeignKey(Site, related_name='users', verbose_name="Site this user will be homed too", null=True)
    public_key = models.TextField(null=True, blank=True, max_length=1024, help_text="Public key string")

    is_active = models.BooleanField(default=True)
    is_admin = models.BooleanField(default=True)
    is_staff = models.BooleanField(default=True)

    timezone = TimeZoneField()

    objects = UserManager()

    USERNAME_FIELD = 'email'
    REQUIRED_FIELDS = ['firstname', 'lastname']

    def get_full_name(self):
        # The user is identified by their email address
        return self.email

    def get_short_name(self):
        # The user is identified by their email address
        return self.email

    @property
    def keyname(self):
        return self.email[:self.email.find('@')]

    def __unicode__(self):
        return self.email

    def has_perm(self, perm, obj=None):
        "Does the user have a specific permission?"
        # Simplest possible answer: Yes, always
        return True

    def has_module_perms(self, app_label):
        "Does the user have permissions to view the app `app_label`?"
        # Simplest possible answer: Yes, always
        return True

    def get_roles(self):
        from core.models.site import SitePrivilege
        from core.models.slice import SliceMembership

        site_privileges = SitePrivilege.objects.filter(user=self)
        slice_memberships = SliceMembership.objects.filter(user=self)
        roles = defaultdict(list)
        for site_privilege in site_privileges:
            roles[site_privilege.role.role_type].append(site_privilege.site.login_base)
        for slice_membership in slice_memberships:
            roles[slice_membership.role.role_type].append(slice_membership.slice.name)
        return roles   

    def save(self, *args, **kwds):
        if not hasattr(self, 'os_manager'):
            from openstack.manager import OpenStackManager 
            setattr(self, 'os_manager', OpenStackManager())
        self.os_manager.save_user(self)

        if not self.id:
            self.set_password(self.password)    
        super(User, self).save(*args, **kwds)   

    def delete(self, *args, **kwds):
        if not hasattr(self, 'os_manager'):
            from openstack.manager import OpenStackManager
            setattr(self, 'os_manager', OpenStackManager())
        self.os_manager.delete_user(self)

        super(User, self).delete(*args, **kwds)