import json
import sys
from collections.abc import Iterator
from types import SimpleNamespace
from typing import Any

import pytest
from fastapi import HTTPException
from sqlalchemy import create_engine, func, select
from sqlalchemy.orm import Session, sessionmaker
from sqlalchemy.pool import StaticPool

from app.application.feishu.events import FeishuEventService
from app.core.config import get_settings
from app.core.database import Base
from app.modules.audit.models import AuditLog
from app.modules.feishu import long_connection
from app.modules.feishu.app_tickets import FeishuAppTicketService
from app.modules.feishu.constants import FeishuEventSource
from app.modules.feishu.models import FeishuAppTicket, FeishuEventReceipt


@pytest.fixture
def session_factory(
    monkeypatch: pytest.MonkeyPatch,
) -> Iterator[sessionmaker[Session]]:
    monkeypatch.setenv("FEISHU_APP_ID", "cli-ticket-app")
    monkeypatch.setenv("FEISHU_APP_SECRET", "ticket-app-secret")
    monkeypatch.setenv("FEISHU_VERIFICATION_TOKEN", "ticket-token")
    monkeypatch.setenv("FEISHU_USER_FEATURES_ENABLED", "false")
    get_settings.cache_clear()
    engine = create_engine(
        "sqlite://",
        connect_args={"check_same_thread": False},
        poolclass=StaticPool,
    )
    Base.metadata.create_all(
        engine,
        tables=[
            AuditLog.__table__,
            FeishuEventReceipt.__table__,
            FeishuAppTicket.__table__,
        ],
    )
    factory = sessionmaker(bind=engine, expire_on_commit=False)
    try:
        yield factory
    finally:
        Base.metadata.drop_all(
            engine,
            tables=[
                FeishuAppTicket.__table__,
                FeishuEventReceipt.__table__,
                AuditLog.__table__,
            ],
        )
        engine.dispose()
        get_settings.cache_clear()


def _v2_ticket_event(
    event_id: str,
    ticket: str,
    *,
    app_id: str = "cli-ticket-app",
) -> dict[str, Any]:
    return {
        "schema": "2.0",
        "header": {
            "event_id": event_id,
            "event_type": "app_ticket",
            "token": "ticket-token",
            "app_id": app_id,
        },
        "event": {"app_ticket": ticket},
    }


def _v1_ticket_event(
    event_id: str,
    ticket: str,
    *,
    app_id: str = "cli-ticket-app",
) -> dict[str, Any]:
    return {
        "ts": "1785081600.000",
        "uuid": event_id,
        "token": "ticket-token",
        "type": "app_ticket",
        "event": {
            "app_id": app_id,
            "app_ticket": ticket,
        },
    }


def test_verified_ticket_is_deduplicated_rotated_and_never_leaked(
    session_factory: sessionmaker[Session],
) -> None:
    first_ticket = "ticket-secret-first"
    rotated_ticket = "ticket-secret-rotated"
    with session_factory() as db:
        service = FeishuEventService(db)
        first = service._handle_verified_event(
            _v2_ticket_event("ticket-event-1", first_ticket),
            source=FeishuEventSource.WEBHOOK,
        )
        stored = db.scalar(select(FeishuAppTicket))
        assert stored is not None
        stored_id = stored.id
        first_received_at = stored.received_at
        assert FeishuAppTicketService(db).get_ticket("cli-ticket-app") == first_ticket
        assert first_ticket not in json.dumps(first, ensure_ascii=False)

        duplicate_payload = _v2_ticket_event(
            "ticket-event-1",
            "ticket-secret-duplicate-must-not-win",
        )
        duplicate = service._handle_verified_event(
            duplicate_payload,
            source=FeishuEventSource.LONG_CONNECTION,
        )
        assert duplicate["duplicate"] is True
        assert FeishuAppTicketService(db).get_ticket("cli-ticket-app") == first_ticket

        rotated = service._handle_verified_event(
            _v2_ticket_event("ticket-event-2", rotated_ticket),
            source=FeishuEventSource.LONG_CONNECTION,
        )
        db.expire_all()
        current = db.scalar(select(FeishuAppTicket))
        assert current is not None
        assert current.id == stored_id
        assert current.app_ticket == rotated_ticket
        assert current.received_at >= first_received_at
        assert db.scalar(select(func.count()).select_from(FeishuAppTicket)) == 1
        assert db.scalar(select(func.count()).select_from(FeishuEventReceipt)) == 2
        assert rotated_ticket not in json.dumps(rotated, ensure_ascii=False)

        audits = list(db.execute(select(AuditLog)).scalars())
        assert len(audits) == 2
        serialized_audits = json.dumps(
            [
                {
                    "request": item.request_payload,
                    "response": item.response_payload,
                    "target": item.target_id,
                }
                for item in audits
            ],
            ensure_ascii=False,
        )
        assert first_ticket not in serialized_audits
        assert rotated_ticket not in serialized_audits
        assert "ticket-secret-duplicate-must-not-win" not in serialized_audits


def test_only_verified_matching_app_ticket_events_can_write(
    session_factory: sessionmaker[Session],
) -> None:
    with session_factory() as db:
        service = FeishuEventService(db)
        unverified = _v2_ticket_event("unverified-ticket", "unverified-secret")
        unverified["header"]["token"] = "invalid-token"
        with pytest.raises(HTTPException) as unverified_error:
            service.handle_event(unverified, source=FeishuEventSource.WEBHOOK)
        assert unverified_error.value.status_code == 401

        with pytest.raises(HTTPException) as mismatch_error:
            service._handle_verified_event(
                _v2_ticket_event(
                    "wrong-app-ticket",
                    "wrong-app-secret",
                    app_id="cli-other-app",
                ),
                source=FeishuEventSource.WEBHOOK,
            )
        assert mismatch_error.value.status_code == 401

        missing_ticket = _v2_ticket_event("missing-ticket", "")
        with pytest.raises(HTTPException) as missing_error:
            service._handle_verified_event(
                missing_ticket,
                source=FeishuEventSource.WEBHOOK,
            )
        assert missing_error.value.status_code == 400

        not_ticket_event = _v2_ticket_event("ordinary-event", "must-not-store")
        not_ticket_event["header"]["event_type"] = "im.message.receive_v1"
        result = service._handle_verified_event(
            not_ticket_event,
            source=FeishuEventSource.WEBHOOK,
            auto_reply=False,
        )
        assert result["handled"] is False
        assert db.scalar(select(FeishuAppTicket)) is None


def test_v1_app_ticket_payload_uses_uuid_receipt(
    session_factory: sessionmaker[Session],
) -> None:
    ticket = "v1-ticket-secret"
    with session_factory() as db:
        result = FeishuEventService(db).handle_event(
            _v1_ticket_event("v1-ticket-uuid", ticket),
            source=FeishuEventSource.WEBHOOK,
        )

        receipt = db.scalar(select(FeishuEventReceipt))
        assert result == {"ok": True, "handled": True}
        assert receipt is not None
        assert receipt.event_id == "v1-ticket-uuid"
        assert receipt.event_key == "cli-ticket-app:app_ticket:v1-ticket-uuid"
        assert FeishuAppTicketService(db).get_ticket("cli-ticket-app") == ticket
        assert ticket not in json.dumps(result, ensure_ascii=False)


def test_long_connection_registers_custom_app_ticket_handler(
    monkeypatch: pytest.MonkeyPatch,
) -> None:
    registrations: dict[str, Any] = {}

    class FakeBuilder:
        def register_p2_im_message_receive_v1(self, handler: Any) -> "FakeBuilder":
            registrations["message"] = handler
            return self

        def register_p1_customized_event(
            self,
            event_type: str,
            handler: Any,
        ) -> "FakeBuilder":
            registrations[event_type] = handler
            return self

        def build(self) -> "FakeBuilder":
            return self

    class FakeDispatcherHandler:
        @staticmethod
        def builder(encrypt_key: str, verification_token: str) -> FakeBuilder:
            registrations["builder_args"] = (encrypt_key, verification_token)
            return FakeBuilder()

    class FakeClient:
        def __init__(self, **kwargs: Any):
            registrations["client_kwargs"] = kwargs

        def start(self) -> None:
            registrations["started"] = True

    fake_lark = SimpleNamespace(
        EventDispatcherHandler=FakeDispatcherHandler,
        LogLevel=SimpleNamespace(WARNING="warning"),
        ws=SimpleNamespace(Client=FakeClient),
    )
    monkeypatch.setitem(sys.modules, "lark_oapi", fake_lark)
    monkeypatch.setenv("FEISHU_APP_ID", "cli-ticket-app")
    monkeypatch.setenv("FEISHU_APP_SECRET", "ticket-app-secret")
    monkeypatch.setenv("FEISHU_VERIFICATION_TOKEN", "ticket-token")
    get_settings.cache_clear()
    try:
        long_connection.run_long_connection()
    finally:
        get_settings.cache_clear()

    assert registrations["app_ticket"] is long_connection._handle_app_ticket_event
    assert registrations["message"] is long_connection._handle_message_event
    assert registrations["started"] is True