using Edge.Core.Processor;
using System;
using Microsoft.EntityFrameworkCore;
using Microsoft.Extensions.DependencyInjection;
using Microsoft.Extensions.Logging;
using System;
using System.Collections.Generic;
using System.Linq;
using System.Text.Json;
using Edge.Core.UniversalApi;
using Edge.Core.Processor.Dispatcher.Attributes;
using System.Threading.Tasks;
using System.Net.Sockets;
using Microsoft.Extensions.Logging.Abstractions;
using System.Net;
using System.Threading;
using Edge.Core.Parser.BinaryParser.Util;
using System.IO;
using System.Text;

namespace DispenserPartsInfoRetriever
{
    /// <summary>
    /// 市场方面希望将我们广州团队当初在“广东中石化加油机信息在线项目”中所开发的加油机上信息参数
    /// </summary>
    [UniversalApi(Name = OnAppStateChangeEventName, EventDataType = typeof(OnAppStateChangeEventArg), Description = "When the App overall State Changed, like app starts or stops, the event will be fired")]
    [UniversalApi(Name = OnDispenserConnStateChangeEventName, EventDataType = typeof(OnDispenserConnStateChangeEventArg), Description = "When communication state changed for certain dispensere, like the connection between a dispenser and fcc is established or broken, the event will be fired")]
    [UniversalApi(Name = OnDispenserPartsAlarmRetrievedEventName, EventDataType = typeof(OnDispenserPartsAlarmRetrievedEventArg), Description = "When parts alarm info is read from dispenser message, the event will be fired")]
    [MetaPartsDescriptor(
       "油机配件信息获取器",
       "获取油机配件信息,它基于http协议与油机通讯,采集油机端的较底层设备配件信息,并开放API供业务端应用.日志标记为DynamicPrivate_DispenserPartsInfoRetriever"
       , new[] { "Pump" })]
    public class App_HttpServer : IAppProcessor
    {
        public const string OnAppStateChangeEventName = "OnAppStateChange";
        public const string OnDispenserConnStateChangeEventName = "OnDispenserConnStateChange";
        public const string OnDispenserPartsAlarmRetrievedEventName = "OnDispenserPartsAlarmRetrieved";
        public class OnAppStateChangeEventArg
        {
            public string State { get; set; }
            public string Reason { get; set; }
        }

        public class OnDispenserConnStateChangeEventArg
        {
            public string DispenserName { get; set; }
            public string Description { get; set; }
            public string State { get; set; }
            public string Reason { get; set; }
        }

        public class OnDispenserPartsAlarmRetrievedEventArg
        {
            public string DispenserName { get; set; }
            public string DispenserDescription { get; set; }
            public string AlarmName { get; set; }
            public string AlarmDetail { get; set; }
        }

        public class AppConfigV1
        {
            public int ServerListenPort { get; set; } = 7788;

            /// <summary>
            /// by seconds
            /// </summary>
            public int MaxPeriodNoSeeDispenserIncomingHttpRequest { get; set; } = 10;
            public List<DispenserInfoConfigV1> DispenserInfoConfigs { get; set; }
        }

        public class DispenserInfoConfigV1
        {
            public string IpAddress { get; set; }
            public string Name { get; set; }
            public string Description { get; set; }
        }

        private class HttpClientInfo
        {
            /// <summary>
            /// ip:port, like: 192.168.1.10:4567
            /// </summary>
            public string HttpClientEndPointIdentity { get; }
            public HttpListenerContext httpClientContext { get; }
            public DispenserInfoConfigV1 BoundDispenserInfoConfig { get; }

            public HttpClientInfo(HttpListenerContext httpClientContext, AppConfigV1 appConfig)
            {
                this.httpClientContext = httpClientContext;
                this.HttpClientEndPointIdentity = this.httpClientContext.Request.LocalEndPoint.ToString();
                this.BoundDispenserInfoConfig = appConfig.DispenserInfoConfigs.FirstOrDefault(c =>
                        HttpClientEndPointIdentity.StartsWith(c.IpAddress))
                        ?? new DispenserInfoConfigV1()
                        {
                            Name = $"未命名油机({this.HttpClientEndPointIdentity})",
                            IpAddress = this.HttpClientEndPointIdentity,
                            Description = "此油机未在本地WebConsole中定义和配置名称"
                        };
            }

            public DateTime LastMessageReceivedTime { get; set; }
        }

        private System.Timers.Timer timelyCheckDispenserIfOnlineTimer = new System.Timers.Timer();
        /// <summary>
        /// the List is the message buffer, only a complete message is constructed, processing then start.
        /// </summary>
        private List<HttpClientInfo> clientInfos = new List<HttpClientInfo>();
        private AppConfigV1 appConfig;
        private IServiceProvider services;
        private HttpListener httpServer;
        private ILogger logger = NullLogger.Instance;
        protected CancellationTokenSource cancelServerListeningCts;
        public string MetaConfigName { get; set; }


        [ParamsJsonSchemas("appCtorParamsJsonSchema")]
        public App_HttpServer(AppConfigV1 appConfig, IServiceProvider services)
        {
            this.appConfig = appConfig;
            this.services = services;
            var loggerFactory = services.GetRequiredService<ILoggerFactory>();
            this.logger = loggerFactory.CreateLogger("DynamicPrivate_DispenserPartsInfoRetriever");
        }

        public void Init(IEnumerable<IProcessor> processors)
        {
        }

        public async Task<bool> Start()
        {
            this.cancelServerListeningCts = new CancellationTokenSource();
            this.httpServer = new HttpListener();
            this.httpServer.Prefixes.Add($"http://*:{this.appConfig.ServerListenPort}/");
            this.logger.LogInformation($"Starting HttpServer for listening for All IP on port: {this.appConfig.ServerListenPort}");
            var universalApiHub = this.services.GetRequiredService<UniversalApiHub>();
            try
            {
                this.httpServer.Start();
            }
            catch (Exception eee)
            {
                this.logger.LogInformation($"Failed to start HttpServer on port: {this.appConfig.ServerListenPort}, detail: {eee}");
                await universalApiHub.FirePersistGenericAlarm(this,
                    new GenericAlarm()
                    {
                        Title = $"主程序启动失败",
                        Severity = GenericAlarmSeverity.Error,
                        Detail = $"主程序启动失败, 详情: {eee}",
                    }, ga => ga.Detail);
                throw new InvalidOperationException($"Failed to start HttpServer on port: {this.appConfig.ServerListenPort}, detail: {eee}");
            }

            this.logger.LogInformation($"   HttpServer started");
            await universalApiHub.FireEvent(this, OnAppStateChangeEventName, new OnAppStateChangeEventArg() { State = "Started", Reason = "app is started" });
            await universalApiHub.FirePersistGenericAlarm(this,
                    new GenericAlarm()
                    {
                        Title = $"主程序启动成功",
                        Severity = GenericAlarmSeverity.Information,
                        Detail = $"主程序启动成功",
                    }, ga => ga.Detail);
            _ = Task.Run(async () =>
            {
                while (true)
                {
                    HttpListenerContext newHttpClientContext = null;
                    try
                    {
                        newHttpClientContext = await Task.Run(() => this.httpServer.GetContextAsync(), this.cancelServerListeningCts.Token);
                    }
                    catch (TaskCanceledException tce)
                    {
                        this.logger.LogInformation("Fcc as the Http server is canceled due to CancellationTokenSource was set.");
                        try
                        {
                            this.httpServer?.Stop();
                        }
                        catch { return; }
                        finally { }
                    }

                    var newClientInfo = new HttpClientInfo(newHttpClientContext, this.appConfig) { LastMessageReceivedTime = DateTime.Now };
                    this.logger.LogDebug($"A http client: { newClientInfo.BoundDispenserInfoConfig.Name } is connecting and sending in msg.");
                    var existedClientInfo = this.clientInfos.FirstOrDefault(k => k.HttpClientEndPointIdentity == newClientInfo.HttpClientEndPointIdentity.ToString());
                    if (existedClientInfo != null)
                    { }
                    else
                        this.clientInfos.Add(newClientInfo);
                    //var universalApiHub = this.services.GetRequiredService<UniversalApiHub>();
                    //await universalApiHub.FirePersistGenericAlarm(this,
                    //    new GenericAlarm()
                    //    {
                    //        Title = $"{newClientInfo.BoundDispenserInfoConfig?.Name}",
                    //        Severity = GenericAlarmSeverity.Information,
                    //        Detail = $"{newClientInfo.BoundDispenserInfoConfig?.Name} 联机成功",
                    //    }, ga => ga.Detail);
                    //await universalApiHub.FireEvent(this, OnDispenserConnStateChangeEventName,
                    //    new OnDispenserConnStateChangeEventArg() { State = "Connected", DispenserName = $"{newHttpClientContext.Request.RemoteEndPoint.ToString()}", Reason = $"The dispenser with idenity: {newHttpClientContext.Request.RemoteEndPoint} is tcp connected to fcc" });

                    JsonDocument jsonDocument;
                    try
                    {
                        jsonDocument = await JsonDocument.ParseAsync(newClientInfo.httpClientContext.Request.InputStream);
                    }
                    catch (Exception eee)
                    {
                        this.logger.LogInformation($"The http client: {newClientInfo.HttpClientEndPointIdentity.ToString()} has fatal invalid json content that can't even pased as json, exception: {eee}");
                        var universalApiHub = this.services.GetRequiredService<UniversalApiHub>();
                        await universalApiHub.FirePersistGenericAlarm(this,
                            new GenericAlarm()
                            {
                                Title = $"{newClientInfo.BoundDispenserInfoConfig?.Name}",
                                Severity = GenericAlarmSeverity.Information,
                                Detail = $"{newClientInfo.BoundDispenserInfoConfig?.Name} 发送至FCC的内容非法(非法的Json数据), 详情: {eee}",
                            }, ga => ga.Detail);
                        newHttpClientContext.Response.StatusCode = 400;
                        newHttpClientContext.Response.OutputStream.Write(Encoding.UTF8.GetBytes("<HTML><BODY>The data send in Fcc is an illegal Json content</BODY></HTML>"));
                        newHttpClientContext.Response.OutputStream.Close();
                        continue;
                    }

                    if (logger.IsEnabled(LogLevel.Trace))
                    {
                        using (MemoryStream ms = new MemoryStream())
                        {
                            using (var writer = new Utf8JsonWriter(ms))
                            {
                                jsonDocument.WriteTo(writer);
                                writer.Flush();
                                ms.Position = 0;
                                this.logger.LogTrace($"{ newClientInfo.BoundDispenserInfoConfig.Name } incoming msg:{new StreamReader(ms).ReadToEnd()}");
                            }
                        }
                    }

                    try
                    {

                        #region parse json doc

                        var rootEle = jsonDocument.RootElement.GetProperty("dispenserRecord");

                        //加油机基本信息
                        var dispenserBasicInfo_property = rootEle.GetProperty("dispenserBasicInfo");

                        //关键部件信息
                        var keycomponentInfo_property = rootEle.GetProperty("keycomponentInfo");

                        #region 加油机部件寿命信息

                        var dispenserLifecycleInfo_property = rootEle.GetProperty("dispenserLifecycleInfo");

                        //PSAM有效期
                        var PSAMvalidityDate_array = dispenserLifecycleInfo_property.GetProperty("PSAMvalidityDate").EnumerateArray();
                        foreach (var el in PSAMvalidityDate_array)
                        {
                            var nozzleNO = el.GetProperty("nozzleNO").GetString();
                            var validityDate = el.GetProperty("validityDate").GetString();
                        }

                        //读卡器开关次数
                        var ReaderLifecycleInfo_array = dispenserLifecycleInfo_property.GetProperty("ReaderLifecycleInfo").EnumerateArray();
                        foreach (var el in ReaderLifecycleInfo_array)
                        {
                            var nozzleNO = el.GetProperty("nozzleNO").GetString();
                            var valveCycle = el.GetProperty("valveCycle").GetString();
                        }

                        //流量计升数
                        var meterLifecycleInfo_array = dispenserLifecycleInfo_property.GetProperty("meterLifecycleInfo").EnumerateArray();
                        foreach (var el in meterLifecycleInfo_array)
                        {
                            var nozzleNO = el.GetProperty("nozzleNO").GetString();
                            var meterSN = el.GetProperty("meterSN").GetString();
                            var meterVolume = el.GetProperty("meterVolume").GetString();
                        }

                        //电磁阀开关次数
                        var valveLifecycleInfo_array = dispenserLifecycleInfo_property.GetProperty("valveLifecycleInfo").EnumerateArray();
                        foreach (var el in valveLifecycleInfo_array)
                        {
                            var nozzleNO = el.GetProperty("nozzleNO").GetString();
                            var valveNum = el.GetProperty("valveNum").GetString();
                            var valveCycle = el.GetProperty("valveCycle").GetString();
                        }

                        #endregion


                        #region 设备定期检修记录

                        var periodicalmaintenanceInfo_property = rootEle.GetProperty("periodicalmaintenanceInfo");
                        var hydraulicsystemPMDate = periodicalmaintenanceInfo_property.GetProperty("hydraulicsystemPMDate").GetString();
                        var controlsystemPMDate = periodicalmaintenanceInfo_property.GetProperty("controlsystemPMDate").GetString();
                        var gasrecoverysystemPMDate = periodicalmaintenanceInfo_property.GetProperty("gasrecoverysystemPMDate").GetString();

                        #endregion


                        #region 加油机报警信息

                        var dispenserAlarm_property = rootEle.GetProperty("dispenserAlarm");
                        var nozzleStatus_array = dispenserAlarm_property.GetProperty("nozzleStatus").EnumerateArray();
                        foreach (var el in nozzleStatus_array)
                        {
                            var nozzleNO = el.GetProperty("nozzleNO").GetString();
                            var zerotransactionAlarm = el.GetProperty("zerotransactionAlarm").GetString();
                            var powerAlarm = el.GetProperty("powerAlarm").GetString();
                            var fuelingspeedAlarm = el.GetProperty("fuelingspeedAlarm").GetString();
                            var encoderAlarm = el.GetProperty("encoderAlarm").GetString();
                            var prestovershootAlarm = el.GetProperty("prestovershootAlarm").GetString();
                            var lockAlarm = el.GetProperty("lockAlarm").GetString();
                            var valveAlarm = el.GetProperty("valveAlarm").GetString();
                            var leakageAlarm = el.GetProperty("leakageAlarm").GetString();
                            var nozzleoffbootAlarm = el.GetProperty("nozzleoffbootAlarm").GetString();
                            var vaporrecoveryRatioAlarm = el.GetProperty("vaporrecoveryRatioAlarm").GetString();
                        }

                        var taxchipAlarm_array = dispenserAlarm_property.GetProperty("taxchipAlarm").EnumerateArray();
                        foreach (var el in taxchipAlarm_array)
                        {
                            var nozzleNO = el.GetProperty("nozzleNO").GetString();
                            var taxchipAlarmCode = el.GetProperty("taxchipAlarmCode").GetString();
                        }

                        #endregion


                        //智能锁信息
                        var locker_property = rootEle.GetProperty("locker");
                        var lockerStatus_array = locker_property.GetProperty("lockerStatus").EnumerateArray();
                        foreach (var el in lockerStatus_array)
                        {
                        }
                        #endregion

                    }
                    catch (Exception eeee)
                    {
                        this.logger.LogInformation($"The tcp client: {newClientInfo.HttpClientEndPointIdentity.ToString()} has partial error json data, exception: {eeee}");
                        var universalApiHub = this.services.GetRequiredService<UniversalApiHub>();
                        await universalApiHub.FirePersistGenericAlarm(this,
                            new GenericAlarm()
                            {
                                Title = $"{newClientInfo.BoundDispenserInfoConfig?.Name}",
                                Severity = GenericAlarmSeverity.Information,
                                Detail = $"{newClientInfo.BoundDispenserInfoConfig?.Name} 发送至FCC的内容缺失某些字段(Json格式整体合法，但缺少某些字段或者内部细节格式出错), 详情: {eeee}",
                            }, ga => ga.Detail);
                    }
                    finally
                    {
                        newHttpClientContext.Response.StatusCode = 200;
                        newHttpClientContext.Response.OutputStream.Write(Encoding.UTF8.GetBytes("<HTML><BODY>I got you</BODY></HTML>"));
                        newHttpClientContext.Response.OutputStream.Close();
                    }
                }
            });
            this.timelyCheckDispenserIfOnlineTimer.Elapsed += async (s, a) =>
            {
                var connectedDispenserInfo = this.appConfig.DispenserInfoConfigs.Join(this.clientInfos, diConfig => diConfig.IpAddress, tci => tci.HttpClientEndPointIdentity.Split(':').First(), (tci, diConfig) => tci);
                var disconnectedDispenserInfo = this.appConfig.DispenserInfoConfigs.Except(connectedDispenserInfo);
                foreach (var di in disconnectedDispenserInfo)
                {
                    var universalApiHub = this.services.GetRequiredService<UniversalApiHub>();
                    await universalApiHub.CloseAndFirePersistGenericAlarm(this,
                        new GenericAlarm()
                        {
                            Title = $"{di.Name ?? ""} 从未主动联入",
                            Severity = GenericAlarmSeverity.Error,
                            Detail = $"{di.Name ?? ""} ({di.Description}) 未见此油机(本地配置其IP为: {di.IpAddress})主动通过 HTTP 连入 FCC"
                        }, ga => ga.Detail, "new one is on creating", ga => ga.Detail);
                    await universalApiHub.FireEvent(this, OnDispenserConnStateChangeEventName,
                        new OnDispenserConnStateChangeEventArg()
                        {
                            State = "Disconnected",
                            DispenserName = $"{di.Name ?? $""}",
                            Description = $"{di.Description ?? ""}",
                            Reason = $"have not see the dispenser(local config its ip to: {di.IpAddress}) actively connected in for a while"
                        });
                }

                if (!this.clientInfos.Any()) return;
                var longTimeNoSeeClientInfos =
                    this.clientInfos.Where(tci => DateTime.Now.Subtract(tci.LastMessageReceivedTime).TotalSeconds >= this.appConfig.MaxPeriodNoSeeDispenserIncomingHttpRequest).ToArray();
                foreach (var ci in longTimeNoSeeClientInfos)
                {
                    try
                    {
                        this.logger.LogInformation($"{ci.BoundDispenserInfoConfig?.Name} long time no see its msg(上次发入时间为:{ci.LastMessageReceivedTime})");
                        var universalApiHub = this.services.GetRequiredService<UniversalApiHub>();
                        await universalApiHub.CloseAndFirePersistGenericAlarm(this,
                            new GenericAlarm()
                            {
                                Title = $"{ci.BoundDispenserInfoConfig.Name} 一段时间未见其发入消息",
                                Severity = GenericAlarmSeverity.Error,
                                Detail = $"{ci.BoundDispenserInfoConfig.Name} ({ci.BoundDispenserInfoConfig.Description}) 很久未见此油机(本地配置其IP为: {ci.HttpClientEndPointIdentity})发入消息"
                            }, ga => ga.Detail, "new one is on creating", ga => ga.Detail);
                        await universalApiHub.FireEvent(this, OnDispenserConnStateChangeEventName,
                            new OnDispenserConnStateChangeEventArg()
                            {
                                State = "Disconnected",
                                DispenserName = $"{ci.BoundDispenserInfoConfig.Name ?? $""}",
                                Description = $"{ci.BoundDispenserInfoConfig.Description ?? ""}",
                                Reason = $"have not see the dispenser(local config its ip to: {ci.HttpClientEndPointIdentity}) actively send in msg for a while(上次发入时间为:{ci.LastMessageReceivedTime})"
                            });
                    }
                    catch { }
                    finally
                    {
                        //this.clientInfos.Remove(ci);
                    }
                }
            };
            this.timelyCheckDispenserIfOnlineTimer.Interval = 30000;
            this.timelyCheckDispenserIfOnlineTimer.Start();
            return true;
        }

        /// <summary>
        /// 
        /// </summary>
        /// <param name="value">like input "01234", will return byte[2]: 0x00, byte[1]: 0x12, byte[0]: 0x34</param>
        /// <returns></returns>
        public byte[] StringToBcdHex(string value)
        {
            if (value.Length % 2 != 0) value = "0" + value;
            List<byte> output = new List<byte>();
            for (int i = value.Length - 1; i >= 0; i = i - 2)
            {
                output.Add((byte)(byte.Parse(value[i - 1].ToString()) * 16 + byte.Parse(value[i].ToString())));
            }

            output.Reverse();
            return output.ToArray();
        }

        public async Task<bool> Stop()
        {
            var universalApiHub = this.services.GetRequiredService<UniversalApiHub>();
            await universalApiHub.FireEvent(this, OnAppStateChangeEventName, new OnAppStateChangeEventArg() { State = "Stopped", Reason = "app is stopping" });
            try { this.httpServer?.Stop(); } catch { }
            try { this.timelyCheckDispenserIfOnlineTimer?.Stop(); } catch { }
            return true;
        }
    }
}