from django.contrib.auth.models import AbstractUser, BaseUserManager
from django.db import models
from phonenumber_field.modelfields import PhoneNumberField

from apps.core.models import TimeStampedModel


class UserManager(BaseUserManager):
    """Manager for the email-based custom user model."""

    use_in_migrations = True

    def _create_user(self, email, password, **extra_fields):
        if not email:
            raise ValueError("Users must have an email address")
        email = self.normalize_email(email)
        user = self.model(email=email, **extra_fields)
        user.set_password(password)
        user.save(using=self._db)
        return user

    def create_user(self, email, password=None, **extra_fields):
        extra_fields.setdefault("is_staff", False)
        extra_fields.setdefault("is_superuser", False)
        return self._create_user(email, password, **extra_fields)

    def create_superuser(self, email, password=None, **extra_fields):
        extra_fields.setdefault("is_staff", True)
        extra_fields.setdefault("is_superuser", True)
        extra_fields.setdefault("role", "admin")

        if extra_fields.get("is_staff") is not True:
            raise ValueError("Superuser must have is_staff=True.")
        if extra_fields.get("is_superuser") is not True:
            raise ValueError("Superuser must have is_superuser=True.")

        return self._create_user(email, password, **extra_fields)


class User(AbstractUser, TimeStampedModel):
    """Custom user model with email-based auth + extra profile fields."""

    class Role(models.TextChoices):
        ADMIN = "admin", "Admin"
        SUPPLIER = "supplier", "Supplier"

    # Email replaces username as the unique identifier.
    username = None
    email = models.EmailField(unique=True)

    role = models.CharField(
        max_length=10, choices=Role.choices, default=Role.SUPPLIER
    )
    phone_number = PhoneNumberField(unique=True, null=True, blank=True)
    full_name = models.CharField(max_length=120, blank=True)
    avatar = models.ImageField(upload_to="avatars/", null=True, blank=True)
    language = models.CharField(
        max_length=2, choices=[("en", "English"), ("ar", "Arabic")], default="en"
    )
    notifications_enabled = models.BooleanField(default=True)

    USERNAME_FIELD = "email"
    REQUIRED_FIELDS = []

    objects = UserManager()

    class Meta:
        db_table = "users"

    def __str__(self):
        return self.email

    @property
    def is_admin(self):
        return self.role == self.Role.ADMIN

    @property
    def is_supplier(self):
        return self.role == self.Role.SUPPLIER