using learun.operat;
using learun.util;
using Microsoft.AspNetCore.Authorization;
using Microsoft.AspNetCore.Http;
using System.Text;
using System.Threading.Tasks;

namespace EC.Web
{
	/// <summary>
	/// 版 本 EasyCode EC管理后台
	/// Copyright (c) 2019-present EC管理有限公司
	/// 创建人：tobin
	/// 日 期：2019.09.11
	/// 描 述：权限中间件
	/// </summary>
	public class AuthorizeMiddleware
	{
		private readonly RequestDelegate _next;
		private readonly IOperator _operator;

		public AuthorizeMiddleware(RequestDelegate next, IOperator ioperator)
		{
			_next = next;
			_operator = ioperator;
		}

		/// <summary>
		/// 执行
		/// </summary>
		/// <param name="httpContext">请求连接</param>
		/// <returns></returns>
		public async Task Invoke(HttpContext httpContext)
		{
			//string url = SetUrl(httpContext);
			var endpoint = httpContext.GetEndpoint();
			if (httpContext.Request.IsAjax() && endpoint != null && endpoint.Metadata.GetMetadata<IAllowAnonymous>() == null)
			{
				// 获取请求值
				if (!httpContext.Request.Headers["token"].IsEmpty())
				{
					string token = httpContext.Request.Headers["token"].ToString();
					var res = _operator.DecodeToken(token);
					if (res == "TokenExpiredException")
					{
						await RespondWithJson(httpContext.Response, new ResParameter { code = ResponseCode.nologin, info = "登录信息过期" });
						return;
					}
					else if (res == "SignatureVerificationException")
					{
						await RespondWithJson(httpContext.Response, new ResParameter { code = ResponseCode.nologin, info = "非法密钥" });
						return;
					}
					else
					{
						var payload = res.ToObject<Payload>();
						ContextHelper.SetItem("account", payload.Account);
						ContextHelper.SetItem("userId", payload.UserId);
						ContextHelper.SetItem("userName", payload.UserName);
					}
				}
				else
				{
					await RespondWithJson(httpContext.Response, new ResParameter { code = ResponseCode.nologin, info = "权限验证失败" });
					return;
				}
			}
			else
			{
				if (httpContext.Request.Query.ContainsKey("lrmcode"))
				{
					string mouldeCode = httpContext.Request.Query["lrmcode"];
					ContextHelper.SetItem("mouldeCode", mouldeCode);
				}

				if (httpContext.Request.Query.ContainsKey("lraccount"))
				{
					string account = httpContext.Request.Query["lraccount"];
					ContextHelper.SetItem("account", account);
				}
			}

			await _next(httpContext);
			return;
		}

		/// <summary>
		/// 设置url地址
		/// </summary>
		/// <param name="httpContext">请求上下文</param>
		/// <returns></returns>
		private string SetUrl(HttpContext httpContext)
		{
			string url = httpContext.Request.Path + httpContext.Request.QueryString.Value;
			ContextHelper.SetItem("currentUrl", url);
			return url;
		}

		/// <summary>
		/// 返回请求信息
		/// </summary>
		/// <param name="response">返回头</param>
		/// <param name="data">数据</param>
		/// <returns></returns>
		private async Task RespondWithJson(HttpResponse response, object data)
		{
			response.StatusCode = 200;
			response.ContentType = "application/json;charset=utf-8";
			await response.WriteAsync(data.ToJson(), new UTF8Encoding(false));
		}
	}
}