"""
FastAPI主入口
"""
from fastapi import FastAPI, Request
from fastapi.responses import JSONResponse, FileResponse
from fastapi.staticfiles import StaticFiles
from contextlib import asynccontextmanager
import os

from app.config import settings
from app.api.v1 import api_router
from app.core.middleware import setup_middleware
from app.core.exceptions import (
    business_exception_handler,
    validation_exception_handler,
    sqlalchemy_exception_handler,
    general_exception_handler,
    BusinessException
)
from app.db.session import init_db


@asynccontextmanager
async def lifespan(app: FastAPI):
    """应用生命周期管理"""
    # 启动时执行
    print(f"Starting {settings.APP_NAME}...")
    
    # 初始化数据库
    try:
        init_db()
        print("Database initialized successfully")
    except Exception as e:
        print(f"Database initialization warning: {e}")
    
    yield
    
    # 关闭时执行
    print(f"Shutting down {settings.APP_NAME}...")


# 创建FastAPI应用
app = FastAPI(
    title=settings.APP_NAME,
    version=settings.APP_VERSION,
    description="AmazingData金融数据服务平台API",
    docs_url="/docs",
    redoc_url="/redoc",
    lifespan=lifespan
)

# 设置中间件
setup_middleware(app)

# 注册异常处理器
app.add_exception_handler(BusinessException, business_exception_handler)

# 注册路由
app.include_router(api_router)

# 挂载静态文件
static_dir = os.path.join(os.path.dirname(__file__), "static")
if os.path.exists(static_dir):
    app.mount("/static", StaticFiles(directory=static_dir), name="static")


@app.get("/", tags=["根路径"])
async def root():
    """根路径 - 返回前端页面"""
    index_file = os.path.join(static_dir, "index.html")
    if os.path.exists(index_file):
        return FileResponse(index_file)
    return {
        "name": settings.APP_NAME,
        "version": settings.APP_VERSION,
        "docs": "/docs",
        "api": "/api/v1"
    }


@app.get("/health", tags=["健康检查"])
async def health_check():
    """健康检查"""
    return {
        "status": "healthy",
        "version": settings.APP_VERSION
    }


if __name__ == "__main__":
    import uvicorn
    uvicorn.run(
        "app.main:app",
        host="0.0.0.0",
        port=8000,
        reload=settings.DEBUG
    )