"""``tenant_updated`` is emitted from the tenant edit path (Part B3)."""

import pytest

from infrasynth.tenancy.services import TenantService
from infrasynth.tenancy.signals import tenant_updated

pytestmark = pytest.mark.django_db

TENANTS_URL = "/api/v1/tenancy/tenants/"


def _capture(signal):
    received = []
    receiver = lambda **kwargs: received.append(kwargs)  # noqa: E731
    signal.connect(receiver, weak=False)
    return received, receiver


class TestTenantUpdatedSignal:
    def test_patch_emits_with_changed_fields(self, authenticated_client, tenant):
        received, receiver = _capture(tenant_updated)
        try:
            response = authenticated_client.patch(
                f"{TENANTS_URL}{tenant.pk}/", {"name": "Renamed", "locale": "en"}, format="json"
            )
        finally:
            tenant_updated.disconnect(receiver)
        assert response.status_code == 200
        assert len(received) == 1
        assert received[0]["tenant_id"] == str(tenant.pk)
        assert set(received[0]["changes"]) == {"name", "locale"}
        tenant.refresh_from_db()
        assert tenant.name == "Renamed"

    def test_no_signal_when_nothing_changes(self, authenticated_client, tenant):
        received, receiver = _capture(tenant_updated)
        try:
            response = authenticated_client.patch(f"{TENANTS_URL}{tenant.pk}/", {}, format="json")
        finally:
            tenant_updated.disconnect(receiver)
        assert response.status_code == 200
        assert received == []

    def test_service_update_emits(self, tenant):
        received, receiver = _capture(tenant_updated)
        try:
            TenantService().update_tenant(tenant, timezone="Europe/Madrid")
        finally:
            tenant_updated.disconnect(receiver)
        assert received[0]["changes"] == {"timezone": "Europe/Madrid"}

    def test_service_update_ignores_disallowed_fields(self, tenant):
        received, receiver = _capture(tenant_updated)
        try:
            TenantService().update_tenant(tenant, status="archived")
        finally:
            tenant_updated.disconnect(receiver)
        assert received == []
        tenant.refresh_from_db()
        assert tenant.status == "active"