# app/main.py
import os
from contextlib import asynccontextmanager
from fastapi import FastAPI
from dotenv import load_dotenv

from apscheduler.schedulers.asyncio import AsyncIOScheduler
from app.services.fetcher_service import fetch_and_save_trending_data
from app.database import engine
from app.models.models import Base

# 路由总线
from app.api.router import api_router

load_dotenv()
CRAWL_INTERVAL = int(os.getenv("CRAWL_INTERVAL_MINUTES", 10))

scheduler = AsyncIOScheduler()


# ==========================================
# 1. 生命周期管理：App 启动时自动建表 & 启动调度器
# ==========================================
@asynccontextmanager
async def lifespan(app: FastAPI):
    # 1. 数据库建表
    print("正在初始化数据库表...")
    Base.metadata.create_all(bind=engine)
    print("数据库表初始化完成！")

    # 2. 配置并启动定时任务
    scheduler.add_job(
        fetch_and_save_trending_data,
        'interval',
        minutes=CRAWL_INTERVAL,
        id='trending_fetch_job',
        replace_existing=True
    )
    scheduler.start()
    print(f"定时抓取任务已启动，每 {CRAWL_INTERVAL} 分钟执行一次")

    # 为了测试方便，启动时立即执行一次
    await fetch_and_save_trending_data()

    yield  # 此时 FastAPI 开始接受请求

    # 3. 优雅关闭
    scheduler.shutdown()
    print("定时任务已安全关闭")


# 初始化 FastAPI
app = FastAPI(title="AI 新闻聚合引擎 API", lifespan=lifespan)

# ==========================================
# 2. 挂载路由总线
# ==========================================
# 版本控制
app.include_router(api_router, prefix="/api/v1")


# 健康检查
@app.get("/", tags=["健康检查"])
async def root():
    return {"message": "Welcome to AI News Aggregator API", "status": "ok"}