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


class UsernameUserManager(BaseUserManager):
    use_in_migrations = True

    def _create_user(self, username, email, password, **extra_fields):
        if not username:
            raise ValueError("Un username doit être défini")
        if not email:
            raise ValueError("Un email doit être défini")

        email = self.normalize_email(email)
        user = self.model(username=username, email=email, **extra_fields)
        user.set_password(password)
        user.save(using=self.db)
        return user

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

    def create_superuser(self, username, email, password, **extra_fields):
        extra_fields.setdefault("is_staff", True)
        extra_fields.setdefault("is_superuser", True)

        if extra_fields.get("is_staff") is not True:
            raise ValueError("Superuser doit être staff à True")
        if extra_fields.get("is_superuser") is not True:
            raise ValueError("SuperUser doit être is_superuser à True")

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


class User(AbstractUser):
    email = models.EmailField(unique=True)

    max_upload_size = models.PositiveBigIntegerField(default=100*1024*1024) # 100Mo

    objects = UsernameUserManager()