using MAX.Core.Helpers;
using Polly;
using Polly.Retry;
using System;
using System.Collections.Generic;
using System.Net;

namespace Store.Framework.HttpResultParser
{
    public class HttpResultVerify
    {
        /// <summary>
        /// 重新尝试请求
        /// </summary>
        /// <param name="action">请求方法</param>
        /// <param name="retryCount">重试次数</param>
        /// <param name="sleepTime">间隔时间</param>
        /// <returns></returns>
        public static HttpResultVerify TryVerify(Func<HttpResult> action, int retryCount = 3, int sleepTime = 1000)
        {
            return new HttpResultVerify(action, retryCount, sleepTime);
        }
        private int retryCount = 3;
        private int sleepTime = 1000;
        private readonly Func<HttpResult> _action;
        private RetryPolicy<HttpResult> retryPolicy;
        private List<IHttpResultVerify> _listUse = new List<IHttpResultVerify>();
        private List<Func<HttpResult, bool>> _addRetTryList = new List<Func<HttpResult, bool>>();
        public HttpResultVerify(Func<HttpResult> action)
        {
            _action = action;
            retryPolicy = TryHttpExec(_action);
        }
        public HttpResultVerify(Func<HttpResult> action, int RetryCount) : this(action)
        {
            retryCount = RetryCount;
        }
        public HttpResultVerify(Func<HttpResult> action, int RetryCount, int SleepTime) : this(action, RetryCount)
        {
            sleepTime = SleepTime;
        }
        /// <summary>
        /// 添加检测Http返回
        /// </summary>
        /// <typeparam name="T"></typeparam>
        public void UseCheckResult<T>() where T : IHttpResultVerify, new()
        {
            _listUse.Add(new T());
        }
        /// <summary>
        /// 添加检测Http返回
        /// </summary>
        /// <typeparam name="T"></typeparam>
        public void UseCheckResult<T>(T checkResult) where T : IHttpResultVerify
        {
            _listUse.Add(checkResult);
        }
        /// <summary>
        /// 添加 是否再次尝试 true 再次尝试 false 不再尝试
        /// </summary>
        /// <param name="func"></param>
        /// <returns></returns>
        public HttpResultVerify AddRetTry(Func<HttpResult, bool> func)
        {
            _addRetTryList.Add(func);
            return this;
        }

        /// <summary>
        /// 执行
        /// </summary>
        /// <returns></returns>
        public HttpResult Exec()
        {
            return retryPolicy.Execute(() =>
             {
                 var result = _action();
                 foreach (var item in _listUse)
                 {
                     result = item.CheckResult(result);
                 }
                 return result;
             });
        }




        private bool RetTry(HttpResult result)
        {
            //返回结果状态判断 再次执行
            var ret = false;
            ret = result.StatusCode != HttpStatusCode.OK;
            foreach (var item in _listUse)
            {
                ret = item.RetTry(result);
                if (ret)
                {
                    break;
                }
            }
            if (!ret)
            {
                foreach (var item in _addRetTryList)
                {
                    ret = item(result);
                    if (ret)
                    {
                        break;
                    }
                }
            }
            return ret;
        }
        /// <summary>
        /// 尝试执行
        /// </summary>
        /// <param name="action"></param>
        /// <returns></returns>
        private RetryPolicy<HttpResult> TryHttpExec(Func<HttpResult> action, int sleepTime = 1000)
        {
            if (retryCount == 0)
            {
                retryCount = 3;
            }
            var retryPolicy = Policy
                .Handle<Exception>(a =>
                {
                    if (a.Message == "登录失效")
                    {
                        return false;
                    }
                    return true;
                })
                .OrResult<HttpResult>(RetTry)
                .WaitAndRetry(retryCount, retryAttempt =>
                {
                    return TimeSpan.FromMilliseconds(sleepTime);
                }
                , (ex, timespan, retryindex, context) =>
                {
                    Console.WriteLine($"开始第 {retryindex} 次重试：");
                });
            return retryPolicy;
        }

    }

    
}