"""
FastAPI 应用包
"""
__version__ = "1.0.0"


"""
FastAPI 应用实例
"""
from fastapi import FastAPI
from fastapi.middleware.cors import CORSMiddleware
from contextlib import asynccontextmanager
import logging

from app.core.config import get_settings
from app.core.database import register_db, init_db, close_db
from app.api import api_router

# 获取配置
settings = get_settings()

# 配置日志
logging.basicConfig(
    level=getattr(logging, settings.logging_level),
    format='%(asctime)s - %(name)s - %(levelname)s - %(message)s',
)

logger = logging.getLogger(__name__)

@asynccontextmanager
async def lifespan(app: FastAPI):
    """
    应用生命周期管理
    
    注意：在生产环境的模块银行中，数据库初始化可能失败
    这里使用 try-except 确保应用能够正常启动
    """
    logger.info(f"🚀 启动 {settings.app_name} v{settings.app_version}")
    logger.info(f"🌍 环境: {settings.env}")
    
    # 初始化数据库（生产环境可能跳过）
    try:
        if settings.env == "development" or settings.generate_schemas:
            await init_db()
        else:
            logger.info("⏭️  生产环境跳过自动数据库初始化")
    except Exception as e:
        logger.warning(f"⚠️  数据库初始化失败: {e}")
        logger.warning("💡 提示：应用将继续运行，但数据库功能可能受限")
    
    yield
    
    # 关闭数据库连接
    try:
        await close_db()
    except Exception as e:
        logger.warning(f"⚠️  数据库关闭失败: {e}")
    
    logger.info("👋 关闭应用")

# 创建 FastAPI 应用实例
app = FastAPI(
    title=settings.app_name,
    version=settings.app_version,
    description=settings.description,
    docs_url="/docs" if settings.debug else None,
    redoc_url="/redoc" if settings.debug else None,
    openapi_url="/openapi.json" if settings.debug else None,
    lifespan=lifespan,
)

# 添加 CORS 中间件
app.add_middleware(
    CORSMiddleware,
    allow_origins=settings.cors_allow_origins,
    allow_credentials=settings.cors_allow_credentials,
    allow_methods=settings.cors_allow_methods,
    allow_headers=settings.cors_allow_headers,
)

# 注册数据库
app = register_db(app)

# 注册路由
app.include_router(api_router, prefix="/api/v1")

# 根路由
@app.get("/", summary="根路径")
async def root():
    """根路径，返回应用信息"""
    return {
        "message": f"欢迎使用 {settings.app_name}",
        "version": settings.app_version,
        "docs": "/docs" if settings.debug else None,
        "health": "/api/v1/health",
    }

# 全局异常处理器
@app.exception_handler(Exception)
async def global_exception_handler(request, exc):
    """全局异常处理器"""
    logger.error(f"全局异常: {exc}")
    return {
        "error": "内部服务器错误",
        "detail": str(exc) if settings.debug else "请查看服务器日志"
    }

logger.info("✅ FastAPI 应用初始化完成")