from infrasynth.billing.gateways.base import (
    BasePaymentGateway,
    CheckoutSessionResult,
    WebhookResult,
)


class FakeGateway(BasePaymentGateway):
    """Deterministic in-memory gateway for tests and demos."""

    gateway_slug = "fake"

    def __init__(self, config: dict | None = None):
        self.config = config or {}
        self.create_should_fail = self.config.get("create_should_fail", False)

    def create_checkout_session(self, plan, user, **kwargs) -> CheckoutSessionResult:
        if self.create_should_fail:
            raise ValueError("Fake gateway failure")
        return CheckoutSessionResult(
            session_id="cs_fake_123",
            checkout_url="https://checkout.example.com/cs_fake_123",
            client_secret="secret_123",
        )

    def handle_webhook(self, payload, headers) -> WebhookResult:
        if payload.get("event") == "ignored":
            return WebhookResult(event_type="ignored", is_handled=False, data={})
        return WebhookResult(
            event_type=payload.get("event", "checkout.session.completed"),
            is_handled=True,
            data={"id": payload.get("data", {}).get("id")},
        )

    def cancel_subscription(self, subscription) -> bool:
        return True

    def sync_subscription(self, subscription) -> dict:
        return {
            "status": "active",
            "current_period_end": "2026-12-31T00:00:00Z",
            "metadata": {"synced": True},
        }

    def get_invoice(self, invoice) -> dict:
        return {
            "external_id": "inv_fake_1",
            "status": "paid",
            "amount": 10.0,
            "currency": "USD",
        }

    def health_check(self) -> bool:
        return True