import pytest

from infrasynth.billing.models import (
    App,
    Entitlement,
    Invoice,
    PaymentGateway,
    Plan,
    Subscription,
)
from infrasynth.shared.enums import EntitlementStatus, InvoiceStatus, MonetizationModel, SubscriptionStatus

pytestmark = pytest.mark.django_db


@pytest.fixture
def gateway():
    return PaymentGateway.objects.create(
        slug="stripe",
        display_name="Stripe",
        gateway_class="infrasynth.billing.gateways.stripe.StripeGateway",
        supported_currencies=["USD"],
    )


@pytest.fixture
def app():
    return App.objects.create(slug="messenger", name="Messenger", monetization=MonetizationModel.SUBSCRIPTION)


@pytest.fixture
def plan(app, gateway):
    return Plan.objects.create(
        app=app,
        slug="pro",
        name="Pro",
        price_amount=4900,
        price_currency="USD",
        interval="monthly",
        gateway=gateway,
    )


class TestPaymentGateway:
    def test_create(self):
        gateway = PaymentGateway.objects.create(
            slug="fake",
            display_name="Fake",
            gateway_class="tests.helpers.FakeGateway",
        )
        assert gateway.is_active is True
        assert str(gateway) == "Fake"
        assert gateway.supported_currencies == []
        assert gateway.config == {}

    def test_pk_is_slug(self, gateway):
        assert gateway.pk == "stripe"


class TestApp:
    def test_create(self):
        app = App.objects.create(slug="invoicer", name="Invoicer", monetization=MonetizationModel.ONE_TIME)
        assert app.is_active is True
        assert str(app) == "Invoicer"

    def test_unique_slug(self):
        App.objects.create(slug="x", name="X", monetization="one_time")
        with pytest.raises(Exception):
            App.objects.create(slug="x", name="Y", monetization="one_time")


class TestPlan:
    def test_create(self, app, gateway):
        plan = Plan.objects.create(
            app=app,
            slug="pro",
            name="Pro",
            price_amount=4900,
            price_currency="USD",
            interval="monthly",
            gateway=gateway,
        )
        assert plan.is_active is True
        assert plan.trial_days == 0
        assert plan.features == {}
        assert plan.limits == {}
        assert str(plan) == "messenger:pro"

    def test_slug_unique_per_app(self, app):
        Plan.objects.create(app=app, slug="pro", name="A", price_amount=1, interval="monthly")
        with pytest.raises(Exception):
            Plan.objects.create(app=app, slug="pro", name="B", price_amount=1, interval="monthly")

    def test_same_slug_allowed_across_apps(self, app):
        other = App.objects.create(slug="other", name="Other", monetization="one_time")
        Plan.objects.create(app=app, slug="pro", name="A", price_amount=1, interval="monthly")
        Plan.objects.create(app=other, slug="pro", name="B", price_amount=1, interval="one_time")


class TestEntitlement:
    def test_create(self, tenant, app, plan):
        ent = Entitlement.all_objects.create(tenant=tenant, app=app, plan=plan)
        assert ent.status == EntitlementStatus.ACTIVE
        assert ent.metadata == {}

    def test_unique_per_tenant_app(self, tenant, app):
        Entitlement.all_objects.create(tenant=tenant, app=app)
        with pytest.raises(Exception):
            Entitlement.all_objects.create(tenant=tenant, app=app)


class TestSubscription:
    def test_create(self, tenant, plan, gateway):
        subscription = Subscription.all_objects.create(
            tenant=tenant,
            plan=plan,
            gateway=gateway,
            status=SubscriptionStatus.ACTIVE,
        )
        assert subscription.cancel_at_period_end is False
        assert subscription.metadata == {}

    def test_status_choices(self, tenant, plan, gateway):
        subscription = Subscription.all_objects.create(
            tenant=tenant,
            plan=plan,
            gateway=gateway,
            status=SubscriptionStatus.TRIALING,
        )
        assert subscription.status == "trialing"


class TestInvoice:
    def test_create(self, tenant, gateway):
        invoice = Invoice.all_objects.create(
            tenant=tenant,
            gateway=gateway,
            invoice_number="INV-2026-000001",
            amount=4900,
            currency="USD",
            status=InvoiceStatus.DRAFT,
        )
        assert invoice.tax_amount == 0
        assert invoice.tax_name == ""
        assert invoice.line_items == []
        assert invoice.metadata == {}
        assert invoice.pdf_file_id is None
        assert str(invoice) == "INV-2026-000001"

    def test_unique_invoice_number_per_tenant(self, tenant, gateway):
        Invoice.all_objects.create(tenant=tenant, invoice_number="INV-1", amount=1, currency="USD", status="open")
        with pytest.raises(Exception):
            Invoice.all_objects.create(tenant=tenant, invoice_number="INV-1", amount=1, currency="USD", status="open")