from django.db import models


class Order(models.Model):
    """
    تنها اپی که واقعاً پول جابه‌جا می‌کنه. عمداً از Subscription جدا شده
    چون منطق و ریسکش فرق داره (درگاه، retry، idempotency).
    """
    STATUS_CHOICES = [('pending', 'در انتظار'), ('paid', 'پرداخت‌شده'), ('failed', 'ناموفق')]

    user_id = models.IntegerField(db_index=True)  # ارجاع سبک به accounts.User
    subscription_id = models.IntegerField(null=True, blank=True)  # ارجاع سبک به subscription.Subscription
    amount = models.PositiveIntegerField()
    currency = models.CharField(max_length=10, default='IRT')
    status = models.CharField(max_length=10, choices=STATUS_CHOICES, default='pending')
    idempotency_key = models.CharField(max_length=100, unique=True)
    created_at = models.DateTimeField(auto_now_add=True)

    class Meta:
        ordering = ['-created_at']

    def __str__(self):
        return f"order-{self.pk}-user{self.user_id}"


class Transaction(models.Model):
    order = models.ForeignKey(Order, on_delete=models.CASCADE, related_name='transactions')
    gateway = models.CharField(max_length=30, default='zarinpal')
    gateway_ref_id = models.CharField(max_length=100, blank=True)
    status = models.CharField(max_length=30)
    paid_at = models.DateTimeField(null=True, blank=True)
    created_at = models.DateTimeField(auto_now_add=True)

    class Meta:
        ordering = ['created_at']

    def __str__(self):
        return f"txn-{self.pk}-order{self.order_id}"