using System.Net;
using System.Text.Json;

namespace DS.WMS.JobServiceApi
{
    public class ExceptionHandlingMiddleware
    {


        private readonly RequestDelegate _next;  // 用来处理上下文请求 
        public ExceptionHandlingMiddleware(RequestDelegate next)
        {
            _next = next;
        }

        public async Task InvokeAsync(HttpContext httpContext)
        {
            try
            {
                await _next(httpContext); //要么在中间件中处理，要么被传递到下一个中间件中去
            }
            catch (Exception ex)
            {
                await HandleExceptionAsync(httpContext, ex); // 捕获异常了 在HandleExceptionAsync中处理
            }
        }
        private async Task HandleExceptionAsync(HttpContext context, Exception exception)
        {
            context.Response.ContentType = "application/json";  // 返回json 类型
            var response = context.Response;

            var errorResponse = new ErrorResponse
            {
                Success = false,
            };  // 自定义的异常错误信息类型

            switch (exception)
            {
                 

                default:
                    response.StatusCode = (int)HttpStatusCode.InternalServerError;
                    errorResponse.Message = exception.Message;// "Internal Server errors. Check Logs!";
                    break;
            }
            var result = JsonSerializer.Serialize(errorResponse);
            await context.Response.WriteAsync(result);
        }

        private class ErrorResponse
        {
            public bool Success { get; set; } = true;
            public string Message { get; set; }
        }
    }
}