using Microsoft.Extensions.DependencyInjection;
using Microsoft.Extensions.Logging;
using Gateway.Payment.Shared;
using System;
using System.Collections.Generic;
using System.Reflection;
using System.Text;
using System.Threading;
using System.Threading.Tasks;
using System.Net;
using System.Net.Security;
using System.IO;

namespace PaymentGateway.GatewayApp
{
    public class TongLianAllInPayV1Processor : IPaymentProcessor
    {
        private IServiceProvider services;
        private ILogger logger;
        public TongLianAllInPayV1Processor(IServiceProvider services)
        {
            this.services = services;
            var loggerFactory = services.GetRequiredService<ILoggerFactory>();
            this.logger = loggerFactory.CreateLogger("DynamicPrivate_Gateway.Payment");
        }

        public async Task<GenericProcessResponse> Cancel(PaymentOrder order)
        {
            return new GenericProcessResponse()
            {
                AllInPayResponse = null
            };
        }

        public async Task<GenericProcessResponse> Process(PaymentOrder order)
        {
            order.TradeStatus = TradeStatusEnum.PAYERROR;
            var response = new Dictionary<string, string>();
            try
            {
                response = QrPay(order);
                if (IsSuccessful(response))
                {
                    order.TradeStatus = TradeStatusEnum.SUCCESS;
                }

                if (response != null && response.ContainsKey("trxstatus") && response["trxstatus"] == "2000")
                {
                    this.logger.LogDebug($"Continuous query trx result is ongoing for order: {order.ToSimpleLogString()}");
                    // 当结果码为“2000”时，商户系统可设置间隔时间(建议10秒)重新查询支付结果，直到支付成功或超时(建议40秒)
                    var config = (TongLianPayConfigV1)order.Config;
                    response = await QueryTrxResult(order, config.queryInterval, config.queryTimeout);
                    this.logger.LogDebug($"       Continuous query trx result has done for order: {order.ToSimpleLogString()} with response: {response}");
                    if (IsSuccessful(response))
                    {
                        order.TradeStatus = TradeStatusEnum.SUCCESS;
                    }
                }

                LogResponse(response);
            }
            catch (Exception ex)
            {
                this.logger.LogError($"Request AllInPay exceptioned: {ex.ToString()}");
            }
            return new GenericProcessResponse()
            {
                AllInPayResponse = response
            };
        }

        private async Task<Dictionary<string, string>> QueryTrxResult(PaymentOrder order, int interval = 10, int dueTime = 60)
        {
            this.logger.LogDebug($"AllInPay QueryTrxResult started, query interval = {interval}, dueTime = {dueTime}");
            var reponse = new GenericProcessResponse()
            {
                AllInPayResponse = new Dictionary<string, string>()
            };
            var cts = new CancellationTokenSource();
            try
            {
                await Task.WhenAny(PeriodicTaskV1.Run(Query, QuitQuerying, order, reponse, cts, TimeSpan.FromSeconds(interval)),
                    Task.Delay(TimeSpan.FromSeconds(dueTime)));
                cts.Cancel();
            }
            catch (Exception ex)
            {
                this.logger.LogError($"QueryTrxResult exceptioned, msg {ex}");
            }

            return reponse.AllInPayResponse;
        }

        public async Task<GenericProcessResponse> Query(PaymentOrder order)
        {
            order.TradeStatus = TradeStatusEnum.PAYERROR;
            var response = DoQuery(order);
            if (IsSuccessful(response))
            {
                order.TradeStatus = TradeStatusEnum.SUCCESS;
            }

            LogResponse(response);
            return new GenericProcessResponse()
            {
                AllInPayResponse = response
            };
        }

        public async Task<GenericProcessResponse> Query(PaymentOrder order, GenericProcessResponse reponse, CancellationTokenSource cts)
        {
            var response = await Query(order);
            if (IsSuccessful(reponse.AllInPayResponse))
            {
                cts.Cancel();
            }
            return response;
        }

        public async Task<GenericProcessResponse> Return(PaymentOrder order)
        {
            order.TradeStatus = TradeStatusEnum.PAYERROR;
            var response = DoCancel(order);
            if (IsSuccessful(response))
            {
                order.TradeStatus = TradeStatusEnum.SUCCESS;
            }

            if (response != null && response.ContainsKey("trxstatus") && response["trxstatus"] == "2000")
            {
                //当结果码为“2000”时，商户系统可设置间隔时间(建议10秒)重新查询支付结果，直到支付成功或超时(建议40秒)
                var config = (TongLianPayConfigV1)order.Config;
                this.logger.LogDebug($"Continuous query trx result is ongoing for order: {order.ToSimpleLogString()}");
                response = await QueryTrxResult(order, config.queryInterval, config.queryTimeout);
                this.logger.LogDebug($"       Continuous query trx result has done for order: {order.ToSimpleLogString()} with response: {response}");
                if (IsSuccessful(response))
                {
                    order.TradeStatus = TradeStatusEnum.SUCCESS;
                }
            }

            LogResponse(response);
            return new GenericProcessResponse()
            {
                AllInPayResponse = response
            };
        }
        public Dictionary<string, string> Pay(PaymentOrder order)
        {
            var config = (TongLianPayConfigV1)order.Config;
            var paramDic = BuildBasicParam(config);
            paramDic.Add("trxamt", Convert.ToInt32(order.NetAmount * 100).ToString());
            paramDic.Add("reqsn", order.BillNumber);
            paramDic.Add("paytype", "W01");
            paramDic.Add("body", order.Title);
            paramDic.Add("remark", "");
            paramDic.Add("acct", "");
            paramDic.Add("authcode", order.AuthCode);
            paramDic.Add("notify_url", config.notifyUrl);
            paramDic.Add("limit_pay", "");
            paramDic.Add("idno", "");
            paramDic.Add("truename", "");
            paramDic.Add("asinfo", "");
            paramDic.Add("sign", AllInPayAppUtil.signParam(paramDic, config.appKey));
            return DoRequest(paramDic, "/pay", config);
        }
        public Dictionary<string, string> QrPay(PaymentOrder order)
        {
            if (string.IsNullOrEmpty(order.AuthCode))
                throw new ArgumentException("Must provide AuthCode for TongLianPayV1");
            if (string.IsNullOrEmpty(order.BillNumber))
                throw new ArgumentException("Must provide BillNumber for TongLianPayV1");
            var config = (TongLianPayConfigV1)order.Config;
            var paramDic = BuildBasicParam(config);
            paramDic.Add("trxamt", Convert.ToInt32(order.NetAmount * 100).ToString());
            paramDic.Add("reqsn", order.BillNumber);
            paramDic.Add("paytype", "W01");
            paramDic.Add("body", order.Title);
            paramDic.Add("remark", "");
            paramDic.Add("acct", "");
            paramDic.Add("authcode", order.AuthCode);
            paramDic.Add("notify_url", config.notifyUrl);
            paramDic.Add("limit_pay", "");
            paramDic.Add("idno", "");
            paramDic.Add("truename", "");
            paramDic.Add("asinfo", "");
            paramDic.Add("sign", AllInPayAppUtil.signParam(paramDic, config.appKey));
            return DoRequest(paramDic, "/scanqrpay", config);
        }

        public Dictionary<string, string> DoCancel(PaymentOrder order)
        {
            if (string.IsNullOrEmpty(order.BillNumber))
                throw new ArgumentException("Must provide BillNumber for cancel a trx from remote payment provider");
            var config = (TongLianPayConfigV1)order.Config;
            var paramDic = BuildBasicParam(config);
            paramDic.Add("trxamt", Convert.ToInt32(order.NetAmount * 100).ToString());
            paramDic.Add("reqsn", DateTime.Now.ToFileTime().ToString());
            paramDic.Add("oldtrxid", "");
            paramDic.Add("oldreqsn", order.BillNumber);
            paramDic.Add("sign", AllInPayAppUtil.signParam(paramDic, config.appKey));
            return DoRequest(paramDic, "/cancel", config);
        }

        public Dictionary<string, string> Refund(PaymentOrder order)
        {
            if (string.IsNullOrEmpty(order.BillNumber))
                throw new ArgumentException("Must provide BillNumber for TongLianPayV1");
            var config = (TongLianPayConfigV1)order.Config;
            var paramDic = BuildBasicParam(config);
            paramDic.Add("trxamt", Convert.ToInt32(order.NetAmount * 100).ToString());
            paramDic.Add("reqsn", DateTime.Now.ToFileTime().ToString());
            paramDic.Add("oldtrxid", "");
            paramDic.Add("oldreqsn", order.BillNumber);
            paramDic.Add("sign", AllInPayAppUtil.signParam(paramDic, config.appKey));
            return DoRequest(paramDic, "/refund", config);
        }

        public Dictionary<string, string> DoQuery(PaymentOrder order)
        {
            //String reqsn, String trxid
            var config = (TongLianPayConfigV1)order.Config;
            var paramDic = BuildBasicParam(config);
            paramDic.Add("reqsn", order.BillNumber);
            paramDic.Add("trxid", "");
            paramDic.Add("sign", AllInPayAppUtil.signParam(paramDic, config.appKey));
            return DoRequest(paramDic, "/query", config);
        }

        private Dictionary<string, string> BuildBasicParam(TongLianPayConfigV1 config)
        {
            var paramDic = new Dictionary<string, string>();
            paramDic.Add("cusid", config.cusId);
            paramDic.Add("appid", config.appId);
            paramDic.Add("version", config.apiVersion);
            paramDic.Add("randomstr", DateTime.Now.ToFileTime().ToString());
            return paramDic;

        }

        private Dictionary<string, string> DoRequest(Dictionary<string, string> param, string url, TongLianPayConfigV1 config)
        {
            var rsp = CreatePostHttpResponse(config.apiUrl + url, param, Encoding.UTF8);
            var rspDic = (Dictionary<string, string>)System.Text.Json.JsonSerializer.Deserialize(rsp, typeof(Dictionary<string, string>));

            if ("SUCCESS".Equals(rspDic["retcode"], StringComparison.OrdinalIgnoreCase))//验签
            {
                var signRsp = rspDic["sign"];
                rspDic.Remove("sign");
                var sign = AllInPayAppUtil.signParam(rspDic, config.appKey);
                if (signRsp.Equals(sign))
                {
                    return rspDic;
                }
                else
                    throw new Exception("验签失败");
            }
            else if ("FAIL".Equals(rspDic["retcode"], StringComparison.OrdinalIgnoreCase))
            {
                return rspDic;
            }
            else
            {
                this.logger.LogError("Unexpected response from remote payment gateway, will try to logging it below:");
                LogResponse(rspDic);
                throw new Exception(rspDic["retmsg"]);
            }
        }
        private static readonly string DefaultUserAgent = "Mozilla/4.0 (compatible; MSIE 6.0; Windows NT 5.2; SV1; .NET CLR 1.1.4322; .NET CLR 2.0.50727)";
        private static bool CheckValidationResult(object sender, System.Security.Cryptography.X509Certificates.X509Certificate certificate, System.Security.Cryptography.X509Certificates.X509Chain chain, System.Net.Security.SslPolicyErrors errors)
        {
            return true; //总是接受     
        }
        public static String CreatePostHttpResponse(string url, IDictionary<string, string> parameters, Encoding charset)
        {
            HttpWebRequest request = null;
            //HTTPSQ请求  
            ServicePointManager.ServerCertificateValidationCallback = new RemoteCertificateValidationCallback(CheckValidationResult);
            request = WebRequest.Create(url) as HttpWebRequest;
            request.ProtocolVersion = HttpVersion.Version10;
            request.Method = "POST";
            request.ContentType = "application/x-www-form-urlencoded";
            request.UserAgent = DefaultUserAgent;
            //如果需要POST数据     
            if (!(parameters == null || parameters.Count == 0))
            {
                StringBuilder buffer = new StringBuilder();
                int i = 0;
                foreach (string key in parameters.Keys)
                {
                    if (i > 0)
                    {
                        buffer.AppendFormat("&{0}={1}", key, parameters[key]);
                    }
                    else
                    {
                        buffer.AppendFormat("{0}={1}", key, parameters[key]);
                    }
                    i++;
                }
                byte[] data = charset.GetBytes(buffer.ToString());
                using (Stream stream = request.GetRequestStream())
                {
                    stream.Write(data, 0, data.Length);
                }
            }
            Stream outstream = request.GetResponse().GetResponseStream();   //获取响应的字符串流  
            StreamReader sr = new StreamReader(outstream); //创建一个stream读取流  
            return sr.ReadToEnd();

        }

        private void LogResponse(Dictionary<string, string> rspDic)
        {
            var rsp = "请求返回数据:\n";
            if (rspDic != null)
            {
                foreach (var item in rspDic)
                {
                    rsp += item.Key + "-----" + item.Value + ";\n";
                }
            }
            this.logger.LogInformation($"AllInPay recieved response: {rsp}");
        }

        private bool IsSuccessful(Dictionary<string, string> response)
        {
            if (response != null && response.Count > 0)
            {
                if (response.ContainsKey("retcode") &&
                    response["retcode"] == "SUCCESS")
                {
                    if (response.ContainsKey("trxstatus") &&
                    response["trxstatus"] == "0000")
                    {
                        return true;
                    }
                }
            }
            return false;
        }

        private bool PayFailed(Dictionary<string, string> response)
        {
            if (response != null && response.Count > 0)
            {
                if (response.ContainsKey("retcode") &&
                    response["retcode"] == "SUCCESS")
                {
                    if (response.ContainsKey("trxstatus") &&
                    response["trxstatus"] == "3045")
                    {
                        return true;
                    }
                }
            }
            return false;
        }

        private bool QuitQuerying(Dictionary<string, string> response)
        {
            return IsSuccessful(response) || PayFailed(response);
        }

        public Task<GenericProcessResponse> UnifiedOrder(PaymentOrder order)
        {
            throw new NotImplementedException();
        }

        public Task<GenericProcessResponse> Query(PaymentOrder order, int count, int interval)
        {
            throw new NotImplementedException();
        }
    }

    public class PeriodicTaskV1
    {
        public static async Task Run(Func<PaymentOrder, GenericProcessResponse, CancellationTokenSource, Task<GenericProcessResponse>> process,
            Func<Dictionary<string, string>, bool> predicate, PaymentOrder order,
            GenericProcessResponse response, CancellationTokenSource cts, TimeSpan period)
        {
            while (!cts.Token.IsCancellationRequested)
            {
                if (!cts.Token.IsCancellationRequested)
                {
                    response = await process(order, response, cts);
                    if (response != null && predicate(response.AllInPayResponse))
                        return;
                }
                await Task.Delay(period, cts.Token);
            }
        }
    }
}