import asyncio

from fastapi import FastAPI, Depends, Request
from fastapi.responses import JSONResponse
from fastapi.middleware.cors import CORSMiddleware
from fastapi.openapi.utils import get_openapi

from app.api import router
from app.core.redis import get_redis_client
from app.core.auth import RoleLevel, require_min_role
from app.core.config import settings
from app.core.payment import init_stripe
from app.core.biz_exception import BizException
from app.core.logger import logger
from app.tasks.notification_task import notification_consumer


app = FastAPI(title=settings.app_name)

# -----------------------
# Startup
# -----------------------
@app.on_event("startup")
async def startup():
    # 如果 init_stripe 是 async
    init_stripe()
    
 
# 全局 Redis 客户端


@app.on_event("startup")
async def startup_event():
    """
    FastAPI 启动时执行
    """
    # 启动后台消费任务
    redis_client = await get_redis_client()
    asyncio.create_task(notification_consumer(redis_client))
    print("🟢 Notification consumer started")   


# -----------------------
# Exception Handlers
# -----------------------
@app.exception_handler(BizException)
async def biz_exception_handler(request: Request, exc: BizException):
    return JSONResponse(
        status_code=exc.http_status,
        content={
            "code": exc.code,
            "message": exc.message,
            "data": exc.extra,
        },
    )


@app.exception_handler(Exception)
async def unhandled_exception_handler(request: Request, exc: Exception):
    logger.error("Unhandled exception", exc_info=exc)

    return JSONResponse(
        status_code=500,
        content={
            "code": 50000,
            "message": "Internal Server Error",
            "data": None,
        },
    )


# -----------------------
# CORS
# -----------------------
app.add_middleware(
    CORSMiddleware,
    allow_origins=["*"],
    allow_methods=["*"],
    allow_headers=["*"],
)


# -----------------------
# Routers
# -----------------------
app.include_router(
    router.public_router,
    prefix="/api"
)

app.include_router(
    router.protected_router,
    prefix="/api",
    dependencies=[Depends(require_min_role(RoleLevel.user))]
)

app.include_router(
    router.admin_required_router,
    prefix="/api",
    dependencies=[Depends(require_min_role(RoleLevel.admin))]
)


# -----------------------
# Swagger Bearer Token
# -----------------------
def custom_openapi():
    if app.openapi_schema:
        return app.openapi_schema

    openapi_schema = get_openapi(
        title=app.title,
        version="1.0.0",
        description="API documentation",
        routes=app.routes,
    )

    openapi_schema.setdefault("components", {})
    openapi_schema["components"]["securitySchemes"] = {
        "BearerAuth": {
            "type": "http",
            "scheme": "bearer",
            "bearerFormat": "JWT",
        }
    }

    for path in openapi_schema["paths"].values():
        for method in path.values():
            method.setdefault("security", [])
            method["security"].append({"BearerAuth": []})

    app.openapi_schema = openapi_schema
    return app.openapi_schema


app.openapi = custom_openapi