"""FastAPI 应用工厂"""
from fastapi import FastAPI
from fastapi.middleware.cors import CORSMiddleware
from app.api.lifespan import lifespan
from app.api.routes import api_router
from app.api.errors import proxy_pool_exception_handler, pydantic_validation_handler, general_exception_handler
from app.core.exceptions import ProxyPoolException
from pydantic import ValidationError
from app.core.config import settings as app_settings

# 导入并注册所有插件（显式注册模式）
import app.plugins


def create_app() -> FastAPI:
    app = FastAPI(
        title="代理池API",
        version="2.0.0",
        lifespan=lifespan,
    )

    # CORS
    app.add_middleware(
        CORSMiddleware,
        allow_origins=app_settings.cors_origins_list,
        allow_credentials=True,
        allow_methods=["*"],
        allow_headers=["*"],
    )

    # 异常处理
    app.add_exception_handler(ProxyPoolException, proxy_pool_exception_handler)
    app.add_exception_handler(ValidationError, pydantic_validation_handler)
    app.add_exception_handler(Exception, general_exception_handler)

    # 路由
    app.include_router(api_router)

    @app.get("/")
    async def root():
        return {"message": "欢迎使用代理池API", "status": "running", "data": None}

    @app.get("/health")
    async def health_check():
        from datetime import datetime
        scheduler = app.state.scheduler_service
        return {
            "status": "healthy",
            "timestamp": datetime.now().isoformat(),
            "database": "connected",
            "scheduler": "running" if scheduler.running else "stopped",
            "version": "2.0.0",
        }

    return app