"""
FastAPI 主应用
"""
from fastapi import FastAPI
from fastapi.middleware.cors import CORSMiddleware
from contextlib import asynccontextmanager
from app.core.config import settings
from app.core.redis_client import init_redis, close_redis
from app.api.v1 import api_router
from app.mcp import create_mcp_http_app, get_mcp_session_manager, MCPHeaderAuthApp


try:
    mcp_http_app = create_mcp_http_app()
    mcp_session_manager = get_mcp_session_manager()
except RuntimeError:
    mcp_http_app = None
    mcp_session_manager = None


@asynccontextmanager
async def lifespan(app: FastAPI):
    """应用生命周期管理"""
    # 启动时初始化 Redis
    await init_redis()
    if mcp_session_manager is not None:
        async with mcp_session_manager.run():
            yield
    else:
        yield
    # 关闭时清理 Redis 连接
    await close_redis()


# 创建 FastAPI 应用
app = FastAPI(
    title=settings.APP_NAME,
    version=settings.APP_VERSION,
    description="NEX Docus - 团队协作文档管理平台",
    debug=settings.DEBUG,
    lifespan=lifespan,
)

# 配置 CORS
app.add_middleware(
    CORSMiddleware,
    allow_origins=settings.CORS_ORIGINS,
    allow_credentials=True,
    allow_methods=["*"],
    allow_headers=["*"],
)

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

# 挂载 MCP Streamable HTTP 入口
if mcp_http_app is not None:
    app.mount("/mcp", MCPHeaderAuthApp(mcp_http_app))


@app.get("/")
async def root():
    """根路径"""
    return {
        "name": settings.APP_NAME,
        "version": settings.APP_VERSION,
        "status": "running"
    }


@app.get("/health")
async def health_check():
    """健康检查"""
    return {"status": "healthy"}


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