import uuid
from django.contrib.auth.models import AbstractUser, UserManager as BaseUserManager
from django.db import models
from decimal import Decimal


class UserManager(BaseUserManager):
    def create_user(self, email, password=None, **extra_fields):
        if not email:
            raise ValueError('The Email field 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_superuser(self, email, password=None, **extra_fields):
        extra_fields.setdefault('is_staff', True)
        extra_fields.setdefault('is_superuser', True)
        return self.create_user(email, password, **extra_fields)


class User(AbstractUser):
    id = models.UUIDField(primary_key=True, default=uuid.uuid4, editable=False)
    email = models.EmailField(unique=True)
    username = models.CharField(max_length=150, unique=True, null=True, blank=True)
    wallet_balance = models.DecimalField(max_digits=10, decimal_places=2, default=Decimal('0.00'))
    created_at = models.DateTimeField(auto_now_add=True)
    updated_at = models.DateTimeField(auto_now=True)
    
    objects = UserManager()
    
    USERNAME_FIELD = 'email'
    REQUIRED_FIELDS = []
    
    def __str__(self):
        return self.email
    
    def has_sufficient_balance(self, amount):
        return self.wallet_balance >= Decimal(str(amount))
    
    def deduct_balance(self, amount):
        if self.has_sufficient_balance(amount):
            self.wallet_balance -= Decimal(str(amount))
            self.save()
            return True
        return False
    
    def add_balance(self, amount):
        self.wallet_balance += Decimal(str(amount))
        self.save()