from django.contrib.auth.models import AbstractUser
from django.contrib.auth.base_user import BaseUserManager
from django.db import models

from uuid import uuid4


class UserManager(BaseUserManager):
    """Define a model manager for User model with no username field."""

    use_in_migrations = True

    def _create_user(self, email, password, **extra_fields):
        """Create and save a User with the given email and password."""
        if not email:
            raise ValueError("The given email must be set")
        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):
        """Create and save a regular User with the given email and password."""
        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, **extra_fields):
        """Create and save a SuperUser with the given email and password."""
        extra_fields.setdefault("is_staff", True)
        extra_fields.setdefault("is_superuser", True)

        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 MemoStatus(models.TextChoices):
    Pending = "pending"
    Processing = "processing"
    Done = "done"
    Error = "error"


class ImageMemo(models.Model):
    """Model definition for ImageMemo."""

    id = models.UUIDField(primary_key=True, default=uuid4, editable=False)

    image_mimetype = models.CharField(max_length=256)

    image = models.ImageField(upload_to="uploads/%Y/%m/%d")
    content = models.TextField()

    author = models.ForeignKey("User", on_delete=models.CASCADE, related_name="memos")

    created_at = models.DateTimeField(auto_now_add=True)
    updated_at = models.DateTimeField(
        auto_now=True,
    )

    status = models.CharField(
        max_length=10, choices=MemoStatus.choices, default=MemoStatus.Pending
    )
    error_message = models.TextField(null=True)

    class Meta:
        ordering = ["-created_at"]


class User(AbstractUser):
    email = models.EmailField(unique=True)
    username = None
    first_name = models.CharField(max_length=150, blank=False)
    last_name = models.CharField(max_length=150, blank=False)

    USERNAME_FIELD = "email"
    REQUIRED_FIELDS = ["full_name"]

    objects = UserManager()  # type: ignore

    def __str__(self):
        """Return string representation of our user"""
        return self.email