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


class UserManager(BaseUserManager):
    def create_user(self, email, password=None, **extra_fields):
        if not email:
            raise ValueError("Email is required")
        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_superuser(self, email, password=None):
        user = self.create_user(email=email, password=password, is_staff=True, is_superuser=True)
        return user


class Module(models.Model):
    name = models.CharField(max_length=100)
    code = models.CharField(max_length=100, unique=True)
    description = models.TextField(blank=True)
    is_active = models.BooleanField(default=True)
    created_at = models.DateTimeField(auto_now_add=True)

    def __str__(self):
        return self.name


class Permission(models.Model):
    module = models.ForeignKey(Module, on_delete=models.CASCADE, related_name="permissions")
    name = models.CharField(max_length=100)
    code = models.CharField(max_length=100)
    description = models.TextField(blank=True)

    def __str__(self):
        return f"{self.module.name} - {self.name}"


class Role(models.Model):
    name = models.CharField(max_length=100)
    description = models.TextField(blank=True)
    is_active = models.BooleanField(default=True)
    created_at = models.DateTimeField(auto_now_add=True)

    def __str__(self):
        return self.name


class RolePermission(models.Model):
    role = models.ForeignKey(Role, on_delete=models.CASCADE, related_name="role_permissions")
    permission = models.ForeignKey(Permission, on_delete=models.CASCADE)
    allowed = models.BooleanField(default=True)

    def __str__(self):
        return f"{self.role.name} - {self.permission.name}"


class User(AbstractBaseUser, PermissionsMixin):
    email = models.EmailField(unique=True)
    first_name = models.CharField(max_length=100)
    last_name = models.CharField(max_length=100)
    role = models.ForeignKey(Role, on_delete=models.SET_NULL, null=True, blank=True)
    manager = models.ForeignKey("self", on_delete=models.SET_NULL, null=True, blank=True)
    is_active = models.BooleanField(default=True)
    is_staff = models.BooleanField(default=False)
    created_at = models.DateTimeField(auto_now_add=True)

    USERNAME_FIELD = "email"

    objects = UserManager()

    def __str__(self):
        return self.email