from django.db import models
from django.contrib.auth.models import AbstractBaseUser, BaseUserManager, AbstractUser, Group, PermissionsMixin

class UserManager(BaseUserManager):
    def create_user(self, email, password=None):
        if not email:
            raise ValueError('Users must have an email address')
        
        user = self.model(email=UserManager.normalize_email(email),)
        user.set_password(password)
        user.save(using=self._db)
        return user
    
    def create_superuser(self, email, password):
        user = self.create_user(email, password)
        user.is_superuser = True
        user.save(using=self._db)
        return user


class PerformUserManager(models.Manager):
    def get_queryset(self):
        return super(PerformUserManager, self).get_queryset().filter(groups__name='Исполнитель')


class CustomerUserManager(models.Manager):
    def get_queryset(self):
        return super(CustomerUserManager, self).get_queryset().filter(groups__name='Заказчик')


class User(AbstractBaseUser, PermissionsMixin):
    first_name = models.CharField(max_length=255, blank=True)
    last_name = models.CharField(max_length=255, blank=True)
    email = models.EmailField(max_length=255, unique=True, db_index=True)
    is_active = models.BooleanField(default=True)
    
    @property
    def is_staff(self):
        return self.is_superuser
    
    def __str__(self):
        return self.email
    
    def get_short_name(self):
        return self.email
    
    def get_full_name(self):
        return self.first_name + ' ' + self.last_name
    
    USERNAME_FIELD = 'email'
    REQUIRED_FIELDS = []
    objects = UserManager()
    perform_objects = PerformUserManager()
    customers_objects = CustomerUserManager()
    
    class Meta:
        verbose_name = 'Пользователь'
        verbose_name_plural = 'Пользователи'


class Team(models.Model):
    name = models.CharField(max_length=255)
    users = models.ManyToManyField(User, related_name ='teams', blank=True)
    owner = models.OneToOneField(User, related_name='team', null=True)
    groups = models.ManyToManyField(Group, related_name='teams', blank=True)
    
    def __str__(self):
        return self.name
    
    class Meta:
        verbose_name = 'Команда'
        verbose_name_plural = 'Команды'