"""应用入口：四库异步生命周期 + 中间件 + 全局异常 + 路由装配。"""
from contextlib import asynccontextmanager
import asyncio

import uvicorn
from fastapi import FastAPI

from api.router import api_router
from config import database
from config.database import redis as redis_db
from config.settings import settings
from agent.advisor_agent.runtime import build_default_runtime as advisor_build_default_runtime
from service.customer_agent.bootstrap import (
    build_default_knowledge_upload_service,
    build_default_runtime as customer_build_default_runtime,
)
from service.client_agent.bootstrap import build_default_runtime as build_client_runtime
from service.client_agent.idle_archive_worker import IdleArchiveWorker
from service.advisor.event_consumer import EventConsumer
from service.advisor.scheduler import AdvisorScheduler
from service.memory.facade import MemoryService
from tool.llm import llm as llm_client
from utils.exceptions import register_exception_handlers
from utils.logger import setup_logging
from utils.request_id import RequestIdMiddleware
from utils.performance import PerformanceMiddleware


class LazyResource:
    """Construct an application resource on first use and reuse it thereafter."""

    def __init__(self, factory):
        self._factory = factory
        self._value = None
        self._initialized = False

    @property
    def initialized(self):
        return self._initialized

    def _get(self):
        if not self._initialized:
            self._value = self._factory()
            self._initialized = True
        return self._value

    def get(self, key, default=None):
        return self._get().get(key, default)

    def __getattr__(self, name):
        return getattr(self._get(), name)


@asynccontextmanager
async def lifespan(app: FastAPI):
    setup_logging()
    app.state.customer_agent_runtime = LazyResource(customer_build_default_runtime)
    app.state.client_agent_runtime = LazyResource(build_client_runtime)
    app.state.advisor_agent_runtime = LazyResource(
        lambda: advisor_build_default_runtime(
            llm_client=llm_client,
            memory_service=MemoryService(),
        )
    )
    app.state.client_agent_archive_worker = LazyResource(
        lambda: IdleArchiveWorker(
            redis=app.state.client_agent_runtime.redis,
            memory_service=app.state.client_agent_runtime.memory_service,
        )
    )
    app.state.client_agent_archive_task = None
    app.state.advisor_event_consumer = None
    if settings.advisor.event_consumer_enabled:
        app.state.advisor_event_consumer = EventConsumer(redis_db.client())
        app.state.advisor_event_consumer.start()
    app.state.advisor_scheduler = None
    if settings.advisor.scheduler_enabled:
        app.state.advisor_scheduler = AdvisorScheduler()
        app.state.advisor_scheduler.start()
    app.state.knowledge_upload_service = LazyResource(
        build_default_knowledge_upload_service
    )
    yield
    worker = app.state.client_agent_archive_worker
    if worker.initialized:
        await worker.stop()
        if app.state.client_agent_archive_task is not None:
            await app.state.client_agent_archive_task
    if app.state.advisor_event_consumer is not None:
        await app.state.advisor_event_consumer.stop()
    if app.state.advisor_scheduler is not None:
        app.state.advisor_scheduler.shutdown()
    await database.dispose()


app = FastAPI(title="智能公募基金系统", version="0.1.0", lifespan=lifespan)

app.add_middleware(RequestIdMiddleware)
app.add_middleware(PerformanceMiddleware)
register_exception_handlers(app)
app.include_router(api_router)


@app.get("/")
async def root():
    return {"message": "智能公募基金系统 API", "docs": "/docs"}

if __name__ == '__main__':
    uvicorn.run(app, host="127.0.0.1", port=8000)