import logging.config as logging_config
import os
from contextlib import asynccontextmanager
import fastapi_plugins
from fastapi import FastAPI, Request
from fastapi.exceptions import HTTPException, RequestValidationError
# from fastapi.middleware.wsgi import WSGIMiddleware
from fastapi_sqlalchemy import DBSessionMiddleware
from authx.exceptions import AuthXException
from config import init_config
# from src.middleware.flask import flask_app

from src.utils.exception import http_exception_handler, request_validation_error_handler, authx_exception_handler
# 请求限制
import redis.asyncio as aio_redis
from fastapi_limiter import FastAPILimiter

    
def create_app():
    mysql_config, redis_config = init_config()

    @asynccontextmanager
    async def lifespan(app: FastAPI):
        # 创建日志文件夹和临时文件上传文件夹
        if not os.path.exists("files"):
            os.mkdir("files")
        # 日志配置
        if os.getenv("FAST_API_ENV", "dev") == "prod":
            if not os.path.exists("logs"):
                os.mkdir("logs")
            logging_config.fileConfig('conf/log.ini')
        # 初始化配置文件
        # Redis 缓存初始化
        await fastapi_plugins.redis_plugin.init_app(app, redis_config)
        await fastapi_plugins.redis_plugin.init()
        # 请求限制
        await FastAPILimiter.init(redis=aio_redis.from_url("redis://localhost:6379", encoding="utf8"))
        yield
        # 应用关闭时，关闭redis连接
        await fastapi_plugins.redis_plugin.terminate()
        await FastAPILimiter.close()
    app = FastAPI(lifespan=lifespan)
    # 添加sqlalchemy数据库中间件
    # once the middleware is applied, any route can then access the database session from the global ``db``
    app.add_middleware(DBSessionMiddleware, db_url=mysql_config.sqlalchemy_db_uri)
    # 添加异常处理
    app.add_exception_handler(HTTPException, http_exception_handler)
    app.add_exception_handler(RequestValidationError, request_validation_error_handler)
    # AuthX异常处理
    app.add_exception_handler(AuthXException, authx_exception_handler)
    

    # 可以在这里挂载Flask的应用，复用之前项目的相关代码 
    # app.mount("/v1", WSGIMiddleware(flask_app))


    # 在这里添加API route
    from src.api import example,auth_example
    app.include_router(example.router, tags=["API示例"], prefix="/v1/example")
    app.include_router(auth_example.router, tags=["认证示例"], prefix="/v1/auth_example")
    return app


fast_api_app = create_app()