using Microsoft.AspNetCore.Http;
using Newtonsoft.Json;
using System;
using System.Net;
using System.Threading.Tasks;
using Wood.Entity;
using Wood.EventBus;
using Wood.EventBus.Events;
using Wood.Util;

namespace Wood.Admin.WebApi.Middleware
{
    /// <summary>
    /// 全局异常中间件
    /// </summary>
    public class GlobalExceptionMiddleware
    {
        private readonly RequestDelegate _next;
        private readonly IEventBus _eventBus;
        /// <summary>
        /// 全局异常中间件
        /// </summary>
        /// <param name="next"></param>
        /// <param name="eventBus"></param>
        public GlobalExceptionMiddleware(RequestDelegate next, IEventBus eventBus)
        {
            _next = next;
            _eventBus = eventBus;
        }
        /// <summary>
        /// 
        /// </summary>
        /// <param name="context"></param>
        /// <returns></returns>
        public async Task Invoke(HttpContext context /* other dependencies */)
        {
            try
            {
                await _next(context);
            }
            catch (Exception ex)
            {
                await HandleExceptionAsync(context, ex);
            }
        }
        /// <summary>
        /// 
        /// </summary>
        /// <param name="context"></param>
        /// <param name="exception"></param>
        /// <returns></returns>
        private Task HandleExceptionAsync(HttpContext context, Exception exception)
        {
            var user = GlobalContext.UserInfo;

            var entity = new Entity.SystemManage.LogExceptionEntity
            {
                UserName = user?.UserName,
                RealName = user?.RealName,
                HttpMethod = context.Request.Method.ToUpper(),
                Browser = NetHelper.Browser,
                Os = NetHelper.GetOSVersion(),
                Exception = exception.GetFullExceptionMessage(),
                ExceptionStackTrace = exception.StackTrace,
                Elapsed = 0,
                LogDateTime = DateTime.Now,
                IpAddress = NetHelper.Ip,
                Source = this.GetType().Name,
            };

			entity.RequestUrl = context.Request.Path;
			entity.RequestParam = context.Request.QueryString.Value;
            _eventBus.Publish(new LogExceptionEvent(entity));

            var code = HttpStatusCode.OK;
            context.Response.ContentType = "application/json";
            context.Response.StatusCode = (int)code;
            return context.Response.WriteAsync(JsonConvert.SerializeObject(TData.Error()));
        }
    }
}