import asyncio
import contextlib
from typing import AsyncIterator

import anyio
import jieba
from uvicorn import Config, Server
from mcp.server.streamable_http_manager import StreamableHTTPSessionManager
from quart import Quart
from starlette.applications import Starlette
from starlette.routing import Mount
from starlette.types import Receive, Send, Scope

from applications.config import LOCAL_MODEL_CONFIG, DEFAULT_MODEL
from applications.config import ES_HOSTS, ES_PASSWORD, ELASTIC_SEARCH_INDEX
from applications.config import MILVUS_CONFIG
from applications.resource import init_resource_manager
from mcp_server.server import create_mcp_server, logger

app = Quart(__name__)

# 初始化
MODEL_PATH = LOCAL_MODEL_CONFIG[DEFAULT_MODEL]

resource_manager = init_resource_manager(
    es_hosts=ES_HOSTS,
    es_index=ELASTIC_SEARCH_INDEX,
    es_password=ES_PASSWORD,
    milvus_config=MILVUS_CONFIG,
)


# 确保没有重复事件循环
async def start_mcp_server(host: str, port: int, json_response: bool):
    try:
        # 创建应用
        app = create_mcp_server()
        session_manager = StreamableHTTPSessionManager(
            app=app,
            event_store=None,
            json_response=json_response,
            stateless=True,
        )
        logger.info("Session Manager created and ready.")

        async def handle_streamable_http(scope: Scope, receive: Receive, send: Send) -> None:
            try:
                logger.info(f"Started processing request: {scope}")
                await session_manager.handle_request(scope, receive, send)
                logger.info(f"Finished processing request: {scope}")
            except anyio.ClosedResourceError:
                logger.error("Stream closed unexpectedly during request.")
            except Exception as e:
                logger.error(f"Unexpected error: {e}")

        # 启动应用生命周期管理
        @contextlib.asynccontextmanager
        async def lifespan(starlette_app: Starlette) -> AsyncIterator[None]:
            async with session_manager.run():
                yield

        # 配置Starlette应用
        starlette_app = Starlette(
            debug=True,
            routes=[Mount("/mcp", app=handle_streamable_http)],
            lifespan=lifespan,
        )
        config = Config(app=starlette_app, host=host, port=port)
        server = Server(config=config)
        await server.serve()

    except Exception as e:
        logger.error(f"Error in start_mcp_server: {e}")
        raise

@app.before_serving
async def startup():
    await resource_manager.startup()
    print("Resource manager is ready.")
    jieba.initialize()
    print("Jieba dictionary loaded successfully")
    # 使用 asyncio.create_task 来异步启动 mcp_server
    asyncio.create_task(start_mcp_server("0.0.0.0", 8002, json_response=True))


@app.after_serving
async def shutdown():
    await resource_manager.shutdown()
    print("Resource manager is Down.")


# 注册路由
from routes import server_bp

app.register_blueprint(server_bp)