from __future__ import annotations

from asgiref.sync import async_to_sync
from django.test import TestCase

from core.commands.base import CommandContext
from core.commands.engine import process_inbound_message
from core.gateway.commands import (
    GatewayCommandContext,
    GatewayCommandRoute,
    dispatch_gateway_command,
)
from core.models import (
    ChatSession,
    CommandChannelBinding,
    CommandProfile,
    CommandSecurityPolicy,
    GatewayCommandEvent,
    Message,
    Person,
    PersonIdentifier,
    User,
    UserXmppOmemoState,
)
from core.security.command_policy import CommandSecurityContext, evaluate_command_policy


class CommandSecurityPolicyTests(TestCase):
    def setUp(self):
        self.user = User.objects.create_user(
            username="policy-user",
            email="policy-user@example.com",
            password="x",
        )
        self.person = Person.objects.create(user=self.user, name="Policy Person")
        self.identifier = PersonIdentifier.objects.create(
            user=self.user,
            person=self.person,
            service="xmpp",
            identifier="policy-user@zm.is",
        )
        self.session = ChatSession.objects.create(
            user=self.user,
            identifier=self.identifier,
        )

    def test_command_profile_scope_denies_disallowed_service(self):
        profile = CommandProfile.objects.create(
            user=self.user,
            slug="bp",
            name="Business Plan",
            enabled=True,
            trigger_token="#bp#",
            reply_required=False,
            exact_match_only=True,
        )
        CommandChannelBinding.objects.create(
            profile=profile,
            direction="ingress",
            service="xmpp",
            channel_identifier="policy-user@zm.is",
            enabled=True,
        )
        CommandSecurityPolicy.objects.create(
            user=self.user,
            scope_key="command.bp",
            enabled=True,
            allowed_services=["whatsapp"],
        )
        msg = Message.objects.create(
            user=self.user,
            session=self.session,
            sender_uuid="",
            text="#bp#",
            ts=1000,
            source_service="xmpp",
            source_chat_id="policy-user@zm.is",
            message_meta={},
        )
        results = async_to_sync(process_inbound_message)(
            CommandContext(
                service="xmpp",
                channel_identifier="policy-user@zm.is",
                message_id=str(msg.id),
                user_id=self.user.id,
                message_text="#bp#",
                payload={},
            )
        )
        self.assertEqual(1, len(results))
        self.assertEqual("skipped", results[0].status)
        self.assertTrue(str(results[0].error).startswith("policy_denied:service_not_allowed"))

    def test_gateway_scope_can_require_trusted_omemo_key(self):
        CommandSecurityPolicy.objects.create(
            user=self.user,
            scope_key="gateway.tasks",
            enabled=True,
            require_omemo=True,
            require_trusted_omemo_fingerprint=True,
        )
        UserXmppOmemoState.objects.create(
            user=self.user,
            status="detected",
            latest_client_key="sid:abc",
            last_sender_jid="policy-user@zm.is/phone",
            last_target_jid="jews.zm.is",
        )
        outputs: list[str] = []

        async def _tasks_handler(_ctx, emit):
            emit("ok")
            return True

        handled = async_to_sync(dispatch_gateway_command)(
            context=GatewayCommandContext(
                user=self.user,
                source_message=None,
                service="xmpp",
                channel_identifier="policy-user@zm.is",
                sender_identifier="policy-user@zm.is/phone",
                message_text=".tasks list",
                message_meta={"xmpp": {"omemo_status": "detected", "omemo_client_key": "sid:abc"}},
                payload={},
            ),
            routes=[
                GatewayCommandRoute(
                    name="tasks",
                    scope_key="gateway.tasks",
                    matcher=lambda text: str(text).startswith(".tasks"),
                    handler=_tasks_handler,
                )
            ],
            emit=lambda value: outputs.append(str(value)),
        )
        self.assertTrue(handled)
        self.assertEqual(["ok"], outputs)
        event = GatewayCommandEvent.objects.order_by("-created_at").first()
        self.assertIsNotNone(event)
        self.assertEqual("ok", event.status if event else "")

    def test_gateway_scope_blocks_when_omemo_required_but_missing(self):
        CommandSecurityPolicy.objects.create(
            user=self.user,
            scope_key="gateway.tasks",
            enabled=True,
            require_omemo=True,
        )
        outputs: list[str] = []

        async def _tasks_handler(_ctx, emit):
            emit("unexpected")
            return True

        handled = async_to_sync(dispatch_gateway_command)(
            context=GatewayCommandContext(
                user=self.user,
                source_message=None,
                service="xmpp",
                channel_identifier="policy-user@zm.is",
                sender_identifier="policy-user@zm.is/phone",
                message_text=".tasks list",
                message_meta={"xmpp": {"omemo_status": "no_omemo"}},
                payload={},
            ),
            routes=[
                GatewayCommandRoute(
                    name="tasks",
                    scope_key="gateway.tasks",
                    matcher=lambda text: str(text).startswith(".tasks"),
                    handler=_tasks_handler,
                )
            ],
            emit=lambda value: outputs.append(str(value)),
        )
        self.assertTrue(handled)
        self.assertTrue(outputs)
        self.assertIn("blocked by policy", outputs[0].lower())
        event = GatewayCommandEvent.objects.order_by("-created_at").first()
        self.assertIsNotNone(event)
        self.assertEqual("blocked", event.status if event else "")

    def test_global_scope_override_can_force_scope_disabled(self):
        CommandSecurityPolicy.objects.create(
            user=self.user,
            scope_key="gateway.tasks",
            enabled=True,
        )
        CommandSecurityPolicy.objects.create(
            user=self.user,
            scope_key="global.override",
            settings={"scope_enabled": "off"},
        )
        decision = evaluate_command_policy(
            user=self.user,
            scope_key="gateway.tasks",
            context=CommandSecurityContext(
                service="xmpp",
                channel_identifier="policy-user@zm.is",
                message_meta={},
                payload={},
            ),
        )
        self.assertFalse(decision.allowed)
        self.assertEqual("policy_disabled", decision.code)

    def test_global_scope_override_allowed_services_applies_to_all_scopes(self):
        CommandSecurityPolicy.objects.create(
            user=self.user,
            scope_key="global.override",
            allowed_services=["xmpp"],
        )
        decision = evaluate_command_policy(
            user=self.user,
            scope_key="tasks.commands",
            context=CommandSecurityContext(
                service="whatsapp",
                channel_identifier="12035550123",
                message_meta={},
                payload={},
            ),
        )
        self.assertFalse(decision.allowed)
        self.assertEqual("service_not_allowed", decision.code)