from contextlib import contextmanager
from unittest import mock

import pytest
from django.core.exceptions import ValidationError
from django.db import transaction
from django.dispatch import receiver
from django.test import override_settings

from infrasynth.audit.models import SecurityEvent
from infrasynth.features.models import FeatureFlag, FeatureFlagOverride
from infrasynth.features.registry import FeatureRegistry
from infrasynth.features.services import FeatureService
from infrasynth.notifications.resolvers import VariableResolverRegistry
from infrasynth.webhooks.models import (
    OutboundDelivery,
    OutboundEndpoint,
    OutboundSubscription,
)
from infrasynth.webhooks.registry import EventRegistry
from infrasynth.webhooks.signals import (
    outbound_delivery_failed,
    outbound_delivery_succeeded,
)
from infrasynth.workflows.validators import DataValidatorRegistry

pytestmark = pytest.mark.django_db


@contextmanager
def _emit_and_run_commit_hooks():
    with transaction.atomic():
        yield
        connection = transaction.get_connection()
        pending = list(connection.run_on_commit)
        connection.run_on_commit = []
        for entry in pending:
            func = entry[1]
            func()


@pytest.fixture(autouse=True)
def clean_registries():
    saved_events = dict(EventRegistry._events)
    saved_features = dict(FeatureRegistry._features)
    saved_resolvers = dict(VariableResolverRegistry._resolvers)
    saved_validators = dict(DataValidatorRegistry._validators)
    yield
    EventRegistry._events = saved_events
    FeatureRegistry._features = saved_features
    VariableResolverRegistry._resolvers = saved_resolvers
    DataValidatorRegistry._validators = saved_validators


class TestOutboundDeliverySignalToAuditIntegration:
    def test_outbound_delivery_signal_triggers_audit_event(self, user):
        endpoint = OutboundEndpoint.objects.create(
            name="Test Endpoint",
            url="https://example.com/hook",
            secret="test-secret",
        )
        subscription = OutboundSubscription.objects.create(
            endpoint=endpoint,
            event_name="test.event",
        )
        delivery = OutboundDelivery.objects.create(
            subscription=subscription,
            payload={"key": "value"},
            status=OutboundDelivery.Status.RETRYING,
        )

        @receiver(outbound_delivery_succeeded)
        def create_audit_on_success(sender, **kwargs):
            SecurityEvent.objects.create(
                event_type="webhook_outbound_success",
                actor=user,
                ip_address="127.0.0.1",
                metadata={
                    "delivery_id": kwargs.get("delivery_id"),
                    "event_name": kwargs.get("event_name"),
                    "status_code": kwargs.get("status_code"),
                },
                request_id="integration-test-001",
            )

        outbound_delivery_succeeded.send(
            sender=OutboundDelivery,
            delivery_id=delivery.id,
            event_name="test.event",
            status_code=200,
        )

        assert SecurityEvent.objects.filter(event_type="webhook_outbound_success").exists()
        se = SecurityEvent.objects.get(event_type="webhook_outbound_success")
        assert se.metadata["delivery_id"] == delivery.id
        assert se.metadata["event_name"] == "test.event"
        assert se.metadata["status_code"] == 200
        assert se.actor == user

    def test_outbound_delivery_failed_signal_triggers_audit_event(self, user):
        endpoint = OutboundEndpoint.objects.create(
            name="Test Endpoint",
            url="https://example.com/hook",
            secret="test-secret",
        )
        subscription = OutboundSubscription.objects.create(
            endpoint=endpoint,
            event_name="test.event",
        )
        delivery = OutboundDelivery.objects.create(
            subscription=subscription,
            payload={"key": "value"},
            status=OutboundDelivery.Status.RETRYING,
        )

        @receiver(outbound_delivery_failed)
        def create_audit_on_failure(sender, **kwargs):
            SecurityEvent.objects.create(
                event_type="webhook_outbound_failed",
                actor=user,
                ip_address="127.0.0.1",
                metadata={
                    "delivery_id": kwargs.get("delivery_id"),
                    "event_name": kwargs.get("event_name"),
                    "error": kwargs.get("error"),
                },
                request_id="integration-test-002",
            )

        outbound_delivery_failed.send(
            sender=OutboundDelivery,
            delivery_id=delivery.id,
            event_name="test.event",
            error="Connection timed out",
        )

        assert SecurityEvent.objects.filter(event_type="webhook_outbound_failed").exists()
        se = SecurityEvent.objects.get(event_type="webhook_outbound_failed")
        assert se.metadata["delivery_id"] == delivery.id
        assert se.metadata["error"] == "Connection timed out"
        assert se.actor == user


class TestEventRegistryEmissionIntegration:
    @override_settings(CELERY_TASK_ALWAYS_EAGER=True)
    def test_event_registry_emission_creates_outbound_deliveries(self):
        EventRegistry.register(
            "integration.order.created",
            description="Order created event",
            example_payload={"order_id": "ord_001"},
        )

        endpoint = OutboundEndpoint.objects.create(
            name="Integration Endpoint",
            url="https://example.com/hook",
            secret="test-secret",
        )
        subscription = OutboundSubscription.objects.create(
            endpoint=endpoint,
            event_name="integration.order.created",
        )

        payload = {"order_id": "ord_001", "amount": 100}

        with mock.patch("infrasynth.webhooks.dispatch.requests.post") as post:
            post.return_value.status_code = 200
            post.return_value.text = "ok"
            with _emit_and_run_commit_hooks():
                EventRegistry.emit("integration.order.created", payload)

        assert OutboundDelivery.objects.filter(subscription=subscription).exists()
        delivery = OutboundDelivery.objects.get(subscription=subscription)
        assert delivery.status == OutboundDelivery.Status.SUCCESS
        assert delivery.payload is not None
        assert delivery.response_status == 200


class TestFeatureRegistryRegistrationAndDiscovery:
    def test_feature_registry_registration_and_discovery(self, user):
        FeatureRegistry.register(
            "app_a.premium_feature",
            name="Premium Feature",
            description="A premium feature from App A",
            default=False,
            category="app_a",
        )
        FeatureRegistry.register(
            "app_b.analytics",
            name="Analytics",
            description="Analytics feature from App B",
            default=True,
            category="app_b",
        )

        service = FeatureService()

        assert service.is_enabled("app_a.premium_feature") is False
        assert service.is_enabled("app_b.analytics") is True
        assert service.is_enabled("nonexistent.feature") is False

        flag = FeatureFlag.objects.create(
            slug="app_a.premium_feature",
            name="Premium Feature Override",
            is_active=True,
            rollout_percentage=100,
        )

        assert service.is_enabled("app_a.premium_feature") is True

        FeatureFlagOverride.objects.create(
            flag=flag,
            user=user,
            is_enabled=False,
        )

        assert service.is_enabled("app_a.premium_feature", user=user) is False

        FeatureFlag.objects.create(
            slug="app_c.experimental",
            name="Experimental",
            is_active=False,
            rollout_percentage=100,
        )

        assert service.is_enabled("app_c.experimental") is False


class TestVariableResolverRegistryCrossApp:
    def test_variable_resolver_registry_cross_app(self):
        @VariableResolverRegistry.register(
            "user_name",
            label="User Name",
            description="Resolves the user's full name",
            namespace="app_a",
        )
        def resolve_user_name(recipient, context, request=None):
            return context.get("user_name", "Unknown")

        @VariableResolverRegistry.register(
            "order_total",
            label="Order Total",
            description="Resolves the order total",
            namespace="app_b",
        )
        def resolve_order_total(recipient, context, request=None):
            return context.get("order_total", 0)

        context_a = {"user_name": "Alice"}
        result_a = VariableResolverRegistry.resolve("user_name", "alice@example.com", context_a, namespace="app_a")
        assert result_a == "Alice"

        context_b = {"order_total": 99.99}
        result_b = VariableResolverRegistry.resolve("order_total", "alice@example.com", context_b, namespace="app_b")
        assert result_b == 99.99

        result_unknown = VariableResolverRegistry.resolve("nonexistent", "alice@example.com", {}, namespace="app_a")
        assert result_unknown is None

        available_a = VariableResolverRegistry.get_available_variables(namespace="app_a")
        assert len(available_a) == 1
        assert "app_a:user_name" in available_a

        available_b = VariableResolverRegistry.get_available_variables(namespace="app_b")
        assert len(available_b) == 1
        assert "app_b:order_total" in available_b

        available_all = VariableResolverRegistry.get_available_variables()
        assert len(available_all) == 2


class TestDataValidatorRegistryCrossApp:
    def test_data_validator_registry_cross_app(self):
        class AppAValidator:
            def validate(self, node, data, context):
                return {"validated": True, **data}

        class AppBValidator:
            def validate(self, node, data, context):
                if not data.get("required_field"):
                    raise ValidationError({"required_field": "This field is required."})
                return data

        DataValidatorRegistry.register("app_a_workflow", AppAValidator())
        DataValidatorRegistry.register("app_b_workflow", AppBValidator())

        validator_a = DataValidatorRegistry.get("app_a_workflow")
        assert validator_a is not None
        result = validator_a.validate(None, {"key": "val"}, {})
        assert result["validated"] is True
        assert result["key"] == "val"

        validator_b = DataValidatorRegistry.get("app_b_workflow")
        assert validator_b is not None
        result_valid = validator_b.validate(None, {"required_field": "present"}, {})
        assert result_valid == {"required_field": "present"}

        with pytest.raises(ValidationError) as exc_info:
            validator_b.validate(None, {}, {})
        assert "required_field" in exc_info.value.message_dict

        missing = DataValidatorRegistry.get("nonexistent_workflow")
        assert missing is None