using Newtonsoft.Json;
using System;
using System.Collections.Concurrent;
using System.Collections.Generic;
using System.Diagnostics;
using System.IO;
using System.Net.Http;
using System.Net.NetworkInformation;
using System.Threading;
using System.Threading.Tasks;
using Vinno.IUS.Common.Log;

namespace Vinno.vCloud.Common.FIS
{
    public class vCloudTerminalBuilder
    {
        /// <summary>
        /// connect default server before get terminal connection  faster address info  from address info list
        /// if get null ,can not connected to internet
        /// </summary>
        /// <returns></returns>
        public static ServerInfo GetFasterServer(string filePath = null)
        {
            try
            {
                string settingFilePath = AppDomain.CurrentDomain.BaseDirectory;
                if (string.IsNullOrEmpty(settingFilePath))
                {
                    if (!string.IsNullOrEmpty(filePath))
                    {
                        settingFilePath = filePath;
                    }
                    else
                    {
                        return null;
                    }
                }
                ServerInfo fasterServer = null;
                var speedResults = new ConcurrentDictionary<ServerInfo, int>();
                var serverFilePath = Path.Combine(settingFilePath, "FISServerSettings.conf");
                DefaultServerSettings serverSettings = null;
                if (File.Exists(serverFilePath))
                {
                    var stringValue = File.ReadAllText(serverFilePath);
                    serverSettings = JsonConvert.DeserializeObject<DefaultServerSettings>(stringValue);
                }
                if (serverSettings == null)
                {
                    serverSettings = new DefaultServerSettings
                    {
                        Servers = new List<ServerInfo>
                            {
                                 new ServerInfo { Host = "s01.flyinsono.com", Port = 9096 },
                                 new ServerInfo { Host = "cloud.flyinsono.com", Port = 9096 },
                                 new ServerInfo { Host = "cloud.xinglinghui.com", Port = 9096 },
                            },
                        MasterServer = new ServerInfo { Host = "s01.flyinsono.com", Port = 9096 }
                    };
                }
                Parallel.ForEach(serverSettings.Servers, serverInfo =>
                {
                    var speed = GetConnectServerSpeed(serverInfo.Host);
                    if (speed != -1)
                    {
                        speedResults.TryAdd(serverInfo, speed);
                    }
                });
                if (speedResults.Count == 0)
                {
                    fasterServer = serverSettings.MasterServer;
                }
                else
                {
                    foreach (var result in speedResults)
                    {
                        if (fasterServer == null)
                        {
                            fasterServer = result.Key;
                        }
                        else
                        {
                            if (fasterServer.Host == "cloud.xinglinghui.com" && speedResults[fasterServer] > result.Value + 5)
                            {
                                fasterServer = result.Key;
                            }
                            else if (result.Key.Host == "cloud.xinglinghui.com" && speedResults[fasterServer] > result.Value - 5)
                            {
                                fasterServer = result.Key;
                            }
                            else if (speedResults[fasterServer] > result.Value)
                            {
                                fasterServer = result.Key;
                            }
                        }
                    }
                }
                Logger.WriteLineInfo($"Get faster server is {fasterServer.Host}:{fasterServer.Port}");
                return fasterServer;
            }
            catch (Exception ex)
            {
                Logger.WriteLineError($"Get faster server error: {ex}");
            }

            return new ServerInfo { Host = "s01.flyinsono.com", Port = 9096 };
        }

        /// <summary>
        /// Connect to server
        /// </summary>
        /// <param name="connectionInfo">The connection Info</param>
        /// <returns></returns>
        public IvCloudTerminal Connect(ConnectionInfo connectionInfo, bool isUseOldTerminalSdk = false, string uniqueId = "", string terminalId = "")
        {
            if (string.IsNullOrEmpty(connectionInfo?.Account?.Name) || string.IsNullOrEmpty(connectionInfo?.Account?.Password))
            {
                return null;
            }

            var terminal = new vCloudTerminal(connectionInfo, isUseOldTerminalSdk);
            try
            {
                terminal.Connect(uniqueId, terminalId);
            }
            catch (Exception e)
            {
                Logger.WriteLineError($"Termnial Login ex:{e}");
            }

            return terminal;
        }

        /// <summary>
        /// Register Account
        /// </summary>
        /// <param name="connectionInfo"></param>
        /// <returns></returns>
        public bool Register(ConnectionInfo connectionInfo)
        {
            if (string.IsNullOrEmpty(connectionInfo?.Account?.Name) || string.IsNullOrEmpty(connectionInfo?.Account?.Password) || string.IsNullOrEmpty(connectionInfo?.Organization))
            {
                return false;
            }

            var terminal = new vCloudTerminal(connectionInfo);
            try
            {
                var result = terminal.Register();
                terminal.Dispose();
                return result;
            }
            catch (Exception e)
            {
                Logger.WriteLineError($"Termnial Register error, ex:{e}");
            }
            return false;
        }

        /// <summary>
        /// test connet server speed
        /// </summary>
        /// <param name="serverUrl"></param>
        /// <returns></returns>
        private static int GetConnectServerSpeed(string serverUrl)
        {
            try
            {
                using (var ping = new Ping())
                {
                    var successTimes = 0;
                    var totalTime = 0;
                    for (var i = 0; i < 4; i++)//第一次为预热
                    {
                        try
                        {
                            var reply = ping.Send(serverUrl, 3000);
                            if (reply.Status == IPStatus.Success && i > 0)
                            {
                                Logger.WriteLineInfo($"Connect serverUrl:{serverUrl}, spend time:{reply.RoundtripTime}ms");
                                totalTime += (int)reply.RoundtripTime;
                                successTimes++;
                            }
                        }
                        catch (Exception ex)
                        {
                            Logger.WriteLineError($"Connect serverUrl:{serverUrl} error, Exception:{ex}");
                            continue;
                        }
                    }
                    if (successTimes == 0)
                    {
                        Logger.WriteLineInfo($"Connect serverUrl:{serverUrl} fail, the success times is 0");
                        return -1;
                    }
                    else
                    {
                        var averageValue = totalTime / successTimes;
                        Logger.WriteLineInfo($"Connect serverUrl:{serverUrl},successTimes:{successTimes},spend time averageValue:{averageValue}ms");
                        return averageValue;
                    }
                }
            }
            catch (Exception e)
            {
                Logger.WriteLineError($"Connect Server:{serverUrl}, SpeedTest exception:{e}");
                return -1;
            }
        }

        /// <summary>
        /// test connet server speed
        /// </summary>
        /// <param name="serverUrl"></param>
        /// <returns></returns>
        private static int Old_GetConnectServerSpeed(string serverUrl, bool isUseHttps = false)
        {
            try
            {
                //The following two lines are used to avoid HTTPS security authentication, otherwise httpclient cannot access the unsafe link
                var httpClientHandler = new HttpClientHandler
                {
                    ServerCertificateCustomValidationCallback = (message, certificate2, arg3, arg4) => true
                };

                using (var httpClient = new HttpClient(httpClientHandler))
                {
                    var stopWatch = new Stopwatch();
                    httpClient.Timeout = TimeSpan.FromSeconds(3);
                    var prefix = "http://";
                    if (isUseHttps)
                    {
                        prefix = "https://";
                    }
                    var successTimes = 0;
                    var totalTime = 0;
                    for (var i = 0; i < 4; i++)//第一次为预热
                    {
                        if (i > 0)
                        {
                            ////TODO(FISJuly): removed?
                            Thread.Sleep(1000);
                        }

                        stopWatch.Restart();
                        try
                        {
                            var result = httpClient.GetAsync(prefix + serverUrl + "/HomePage/API/Connect.json").GetAwaiter().GetResult();
                            if (result != null)
                            {
                                var content = result.Content.ReadAsStringAsync().GetAwaiter().GetResult();
                                stopWatch.Stop();
                                if (result.IsSuccessStatusCode && content.Length > 0 && i > 0)
                                {
                                    Logger.WriteLineInfo($"Connect serverUrl:{serverUrl}, spend time:{stopWatch.ElapsedMilliseconds}ms");
                                    totalTime += (int)stopWatch.ElapsedMilliseconds;
                                    successTimes++;
                                }
                            }
                        }
                        catch (Exception ex)
                        {
                            Logger.WriteLineError($"Connect serverUrl:{serverUrl} error, Exception:{ex}");
                            continue;
                        }
                    }
                    if (successTimes == 0)
                    {
                        Logger.WriteLineInfo($"Connect serverUrl:{serverUrl} fail, the success times is 0");
                        return -1;
                    }
                    else
                    {
                        var averageValue = totalTime / successTimes;
                        Logger.WriteLineInfo($"Connect serverUrl:{serverUrl},successTimes:{successTimes},spend time averageValue:{averageValue}ms");
                        return averageValue;
                    }
                }
            }
            catch (Exception e)
            {
                Logger.WriteLineError($"Connect Server:{serverUrl}, SpeedTest exception:{e}");
                return -1;
            }
        }
    }
}