# -*- coding: utf-8 -*-
"""FastAPI 应用工厂。

本应用即唯一服务端：全部端点在 web/routers/ 下按业务域注册。
`api_prefix` 用于把整套路由挂到指定前缀下（便于契约测试与反向代理）。
"""

from contextlib import asynccontextmanager
from pathlib import Path

from fastapi import FastAPI
from fastapi.staticfiles import StaticFiles

from core.config import APP_VERSION
from core.security import init_secret_key
from web.errors import install_error_handlers
from web.middleware import ResponseHygieneMiddleware
from web.routers import account as account_router
from web.routers import admin as admin_router
from web.routers import admin_site as admin_site_router
from web.routers import auth as auth_router
from web.routers import auth_status as auth_status_router
from web.routers import delivery as delivery_router
from web.routers import download as download_router
from web.routers import index as index_router
from web.routers import music as music_router
from web.routers import podcast as podcast_router
from web.routers import register as register_router
from web.routers import site as site_router
from web.routers import stream as stream_router
from web.routers import system as system_router
from web.routers import tasks as tasks_router
from web.routers import user as user_router


@asynccontextmanager
async def _lifespan(app: FastAPI):
    """应用生命周期：关闭时释放 aiohttp 连接池（含按事件循环隔离的 session）。"""
    yield
    try:
        from core import aiohttp_compat, http_client

        await http_client.client.close()
        await aiohttp_compat.close()
    except Exception:
        pass


def _init_audio_secret() -> None:
    """注入音频签名密钥（与 auth_system 同源，令直链 token 与服务端一致）。"""
    try:
        import auth_system

        init_secret_key(auth_system.get_secret_key())
    except Exception:
        pass


def create_app(api_prefix: str = '') -> FastAPI:
    """创建 FastAPI 应用。

    api_prefix：路由挂载前缀。
      - ''（默认）：直接服务前端使用的根路径（生产形态）
      - '/api/v1'：挂在子前缀下（便于契约测试与反向代理）
    """
    _init_audio_secret()

    app = FastAPI(
        title='云村小助手API服务',
        version=APP_VERSION,
        docs_url='/api/v1/docs',
        redoc_url=None,
        openapi_url='/api/v1/openapi.json',
        lifespan=_lifespan,
    )

    # 响应侧统一处理：安全头 + 音频直链签名保护 + 版本指纹抹除
    app.add_middleware(ResponseHygieneMiddleware)

    # 静态资源（/static/site_auth.js 等）——与 Flask static_folder 同目录
    _static_dir = Path(__file__).resolve().parent.parent / 'static'
    if _static_dir.is_dir():
        app.mount('/static', StaticFiles(directory=str(_static_dir)), name='static')

    # 业务路由：统一挂到 api_prefix（默认空前缀，即前端使用的根路径）
    app.include_router(system_router.router, prefix=api_prefix, tags=['system'])
    app.include_router(site_router.router, prefix=api_prefix, tags=['site'])
    app.include_router(music_router.router, prefix=api_prefix, tags=['music'])
    app.include_router(account_router.router, prefix=api_prefix, tags=['account'])
    app.include_router(podcast_router.router, prefix=api_prefix, tags=['podcast'])
    app.include_router(tasks_router.router, prefix=api_prefix, tags=['tasks'])
    app.include_router(delivery_router.router, prefix=api_prefix, tags=['delivery'])
    app.include_router(stream_router.router, prefix=api_prefix, tags=['stream'])
    app.include_router(auth_status_router.router, prefix=api_prefix, tags=['auth'])
    app.include_router(auth_router.router, prefix=api_prefix, tags=['auth'])
    app.include_router(user_router.router, prefix=api_prefix, tags=['user'])
    app.include_router(admin_router.router, prefix=api_prefix, tags=['admin'])
    app.include_router(register_router.router, prefix=api_prefix, tags=['auth'])
    app.include_router(admin_site_router.router, prefix=api_prefix, tags=['admin'])
    app.include_router(download_router.router, prefix=api_prefix, tags=['download'])
    # 首页（根路径，不挂前缀）
    app.include_router(index_router.router, tags=['index'])

    install_error_handlers(app)

    return app