using System.Net;

namespace Ds.Module.ResultFilter
{
    public class ExceptionHandlerMiddleware
    {
        private readonly RequestDelegate _next;

        public ExceptionHandlerMiddleware(RequestDelegate next)
        {
            _next = next;
        }

        public async Task Invoke(HttpContext context)
        {
            try
            {
                await _next(context);
            }
            catch (Exception ex)
            {
                await HandleExceptionAsync(context, ex);
            }
        }

        private static Task HandleExceptionAsync(HttpContext context, Exception exception)
        {
            context.Response.ContentType = "application/json";

            context.Response.StatusCode = (int)HttpStatusCode.OK; DsJsonResult result;
            if (exception is BusinessException businessException)
            {// BusinessException处理
                result = DsResultTool.Fail(businessException.ErrorCode, businessException.Message);
            }
            else
            {
                // 其他未处理异常处理
                // result = ResultTool.Fail(ResultCode.Fail, exception.Message);
                result = DsResultTool.Fail(DsResultCode.Fail, "系统异常！");
            }
            return context.Response.WriteAsJsonAsync(result);
        }
    }
}