from django.db import models
from django.utils import timezone
from django.core.mail import send_mail
from django.contrib.auth.models import (
    BaseUserManager, AbstractBaseUser, PermissionsMixin
)


class MyUserManager(BaseUserManager):
    def create_user(self, email, 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=self.normalize_email(email), 
        )

        user.set_password(password)
        user.save(using=self._db)
        return user

    def create_superuser(self, email, password=None):
        """
        Creates and saves a superuser with the given email, date of
        birth and password.
        """
        user = self.create_user(
            email,
            password=password,
        )
        user.is_staff = True
        user.is_superuser = True
        user.set_password(password)
        user.save(using=self._db)
        return user


class MyUser(AbstractBaseUser, PermissionsMixin):
    email = models.EmailField(
        verbose_name='Емайл',
        max_length=255,
        unique=True,
    )
    first_name = models.CharField('Имя', max_length=150, blank=True)
    last_name = models.CharField('Фамилия', max_length=150, blank=True)
    phone = models.CharField('Телефон', max_length=15, blank=True, null=True, unique=True)
    is_staff = models.BooleanField('Статус персонала', help_text='Отметьте, если пользователь может входить в '
                                                                 'административную часть сайта.', default=False)
    date_joined = models.DateTimeField('Дата регистрации', default=timezone.now)
    number = models.CharField('Номер телефона', max_length=20, null=True)
    objects = MyUserManager()
    USERNAME_FIELD = 'email'
    def __str__(self):
        return self.email

    def full_name(self):
        return f'{self.first_name} {self.last_name}' if self.first_name and self.last_name else 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 email_user(self, subject, message, from_email=None, **kwargs):
        """Send an email to this user."""
        send_mail(subject, message, from_email, [self.email], **kwargs)

    class Meta:
        verbose_name = 'Пользователь'
        verbose_name_plural = 'Пользователи'