using Netch.Forms;
using Netch.Utils;
using System;
using System.Diagnostics;
using System.IO;
using System.Runtime.InteropServices;
using System.Text;
using System.Threading;

namespace Netch.Controllers
{
    public class SSController
    {
        /// <summary>
        ///		进程实例
        /// </summary>
        public Process Instance;

        /// <summary>
        ///		当前状态
        /// </summary>
        public Models.State State = Models.State.Waiting;

        /// <summary>
        ///		启动
        /// </summary>
        /// <param name="server">服务器</param>
        /// <param name="mode">模式</param>
        /// <returns>是否启动成功</returns>
        public bool Start(Models.Server server, Models.Mode mode)
        {
            MainForm.Instance.StatusText($"{Utils.i18N.Translate("Status")}{Utils.i18N.Translate(": ")}{Utils.i18N.Translate("Starting Shadowsocks")}");

            File.Delete("logging\\shadowsocks.log");
            //从DLL启动Shaowsocks
            if (Global.Settings.BootShadowsocksFromDLL && (mode.Type == 0 || mode.Type == 1 || mode.Type == 2 || mode.Type == 3))
            {
                State = Models.State.Starting;
                var client = Encoding.UTF8.GetBytes($"0.0.0.0:{Global.Settings.Socks5LocalPort}");
                var remote = Encoding.UTF8.GetBytes($"{server.Hostname}:{server.Port}");
                var passwd = Encoding.UTF8.GetBytes($"{server.Password}");
                var method = Encoding.UTF8.GetBytes($"{server.EncryptMethod}");
                if (!NativeMethods.Shadowsocks.Info(client, remote, passwd, method))
                {
                    State = Models.State.Stopped;
                    Logging.Info("DLL SS INFO 设置失败！");
                    return false;
                }
                Logging.Info("DLL SS INFO 设置成功！");

                if (!NativeMethods.Shadowsocks.Start())
                {
                    State = Models.State.Stopped;
                    Logging.Info("DLL SS 启动失败！");
                    return false;
                }
                Logging.Info("DLL SS 启动成功！");
                State = Models.State.Started;
                return true;
            }

            if (!File.Exists("bin\\Shadowsocks.exe"))
            {
                return false;
            }
            Instance = MainController.GetProcess();
            Instance.StartInfo.FileName = "bin\\Shadowsocks.exe";

            if (!string.IsNullOrWhiteSpace(server.Plugin) && !string.IsNullOrWhiteSpace(server.PluginOption))
            {
                Instance.StartInfo.Arguments = $"-s {server.Hostname} -p {server.Port} -b {Global.Settings.LocalAddress} -l {Global.Settings.Socks5LocalPort} -m {server.EncryptMethod} -k \"{server.Password}\" -u --plugin {server.Plugin} --plugin-opts \"{server.PluginOption}\"";
            }
            else
            {
                Instance.StartInfo.Arguments = $"-s {server.Hostname} -p {server.Port} -b {Global.Settings.LocalAddress} -l {Global.Settings.Socks5LocalPort} -m {server.EncryptMethod} -k \"{server.Password}\" -u";
            }

            if (mode.BypassChina)
            {
                Instance.StartInfo.Arguments += " --acl default.acl";
            }

            Instance.OutputDataReceived += OnOutputDataReceived;
            Instance.ErrorDataReceived += OnOutputDataReceived;

            State = Models.State.Starting;
            Instance.Start();
            Instance.BeginOutputReadLine();
            Instance.BeginErrorReadLine();
            for (var i = 0; i < 1000; i++)
            {
                Thread.Sleep(10);

                if (State == Models.State.Started)
                {
                    return true;
                }

                if (State == Models.State.Stopped)
                {
                    Utils.Logging.Info("SS 进程启动失败");

                    Stop();
                    return false;
                }
            }

            Utils.Logging.Info("SS 进程启动超时");
            Stop();
            return false;
        }

        /// <summary>
        ///		停止
        /// </summary>
        public void Stop()
        {
            try
            {
                if (Global.Settings.BootShadowsocksFromDLL)
                {
                    NativeMethods.Shadowsocks.Stop();
                    return;
                }

                if (Instance != null && !Instance.HasExited)
                {
                    Instance.Kill();
                    Instance.WaitForExit();
                }
            }
            catch (Exception e)
            {
                Utils.Logging.Info(e.ToString());
            }
        }

        public void OnOutputDataReceived(object sender, DataReceivedEventArgs e)
        {
            if (!string.IsNullOrWhiteSpace(e.Data))
            {
                File.AppendAllText("logging\\shadowsocks.log", $"{e.Data}\r\n");

                if (State == Models.State.Starting)
                {
                    if (Instance.HasExited)
                    {
                        State = Models.State.Stopped;
                    }
                    else if (e.Data.Contains("listening at"))
                    {
                        State = Models.State.Started;
                    }
                    else if (e.Data.Contains("Invalid config path") || e.Data.Contains("usage") || e.Data.Contains("plugin service exit unexpectedly"))
                    {
                        State = Models.State.Stopped;
                    }
                }
            }
        }
    }
}