using System.Diagnostics;
using System.IO;
using System.Security.Cryptography;
using System.Windows;
using Zerolauncher.Defender;

namespace Zerolauncher.Manager
{
    internal class EngineManager
    {
        private static Dictionary<string, SingleGame> mGame = new Dictionary<string, SingleGame>();

        //运行时才能决定是否执行内联
        [System.Runtime.CompilerServices.MethodImpl(System.Runtime.CompilerServices.MethodImplOptions.AggressiveInlining)]
        private static string AccToKey(Account account)
        {
            return string.Format("{0}{1}{2}", account.providerId, account.serverId, account.userName);
        }

        public static bool CreateGame(Account account)
        {
            var key = AccToKey(account);
            if (mGame.ContainsKey(key)) { return false; }
            if (EngineCacheSha.errorCode != 0) {
                switch (EngineCacheSha.errorCode)
                {
                    case 1:
                        MessageBox.Show("发生网络错误==EMS。\n 请检查网络", "错误", MessageBoxButton.OKCancel, MessageBoxImage.Error);
                        break;
                    case 2:
                        MessageBox.Show("发生游戏服务错误==EMS。\n 请联系管理员", "错误", MessageBoxButton.OKCancel, MessageBoxImage.Error);
                        break;
                    default:
                        MessageBox.Show("发生未知错误==EMS。\n 请联系管理员", "错误", MessageBoxButton.OKCancel, MessageBoxImage.Error);
                        break;
                }
                return false; 
            }
            try
            {
                mGame[key] = new SingleGame(account);
            }catch (Exception _ex)
            {
                MessageBox.Show("发生错误！\n如重复发生此错误，\n请重新下载登陆器文件或联系管理员。", "错误", MessageBoxButton.OKCancel, MessageBoxImage.Error);
                return false;
            }
            return true;
        }

        public static bool CreateGame(int memberId)
        {
            return CreateGame(AccountManager.accountsList[memberId]);
        }

        public static int CheckGameState(Account account)
        {
            var key = AccToKey(account);
            if (mGame.ContainsKey(key)) { return mGame[key].mHandle; }
            return -1;
        }

        public static short TurnGameSizeMini(Account account)
        {
            var key = AccToKey(account);
            if (mGame.ContainsKey(key)) 
            {
                var game = mGame[key];
                if (game.mHandle != 0)
                {
                    game.Send(StaticHandleS.MiniSize);
                    return 2;
                }
                return 1;
            }
            return 0;
        }

        public static short TurnGameSizeNormal(Account account)
        {
            var key = AccToKey(account);
            if (mGame.ContainsKey(key))
            {
                var game = mGame[key];
                if (game.mHandle != 0)
                {
                    game.Send(StaticHandleS.NormalSize);
                    return 2;
                }
                return 1;
            }
            return 0;
        }

        public static bool ExitGame(Account account)
        {
            var key = AccToKey(account);
            if (!mGame.ContainsKey(key)) { return false; }
            mGame[key].Send(StaticHandleS.CloseGame);
            return true;
        }

        public static void OnGameExit(Account account)
        {
            mGame.Remove(AccToKey(account));
        }

        public static bool CheckEmpy()
        {
            return mGame.Count == 0;
        }
    }

    class SingleGame
    {
        Process process;

        string? restartUrl;

        public int mHandle;

        public Account account;

        public SingleGame(Account acc) 
        {
            restartUrl = null;
            this.account = acc;
            mHandle = 0;
            process = EngineShell.CheckEngineSafe();
            process.OutputDataReceived += Handle;
            process.Exited += Process_Exited;
            process.Start();
            process.BeginOutputReadLine(); // 开始异步读取
        }

        private void CreateProcess()
        {
            process = EngineShell.CheckEngineSafe();
            process.OutputDataReceived += Handle;
            process.Exited += Process_Exited;
            process.Start();
            process.BeginOutputReadLine(); // 开始异步读取
        }

        private void Process_Exited(object? sender, EventArgs e)
        {
            Trace.WriteLine(
                $"Exit time    : {process.ExitTime}\n" +
                $"Exit code    : {process.ExitCode}\n" +
                $"Elapsed time : {Math.Round((process.ExitTime - process.StartTime).TotalMilliseconds)}");
            Trace.WriteLine($"进程已退出:{account.nickName}");
            if ( restartUrl == null ) 
            { 
                EngineManager.OnGameExit(account);
                return;
            }
            CreateProcess();
        }

        private void Handle(object sender, DataReceivedEventArgs e)
        {
            var lines = e.Data == null? [""] : e.Data.Split(" ");
            switch (lines[0])
            {
                case StaticHandleC.StartDone:
                    if(restartUrl == null)
                    {
                        Send($"{StaticHandleS.ShowWindow} {ServicesStaticInfo.ServicesName[account.providerId]}-{account.nickName}");
                        _ = LoginManager.DoLogin(this);
                    }
                    else
                    {
                        Send($"{StaticHandleS.ShowWindow} {ServicesStaticInfo.ServicesName[account.providerId]}-{account.nickName}");
                        Send($"{StaticHandleS.GameSa} {restartUrl}");
                        restartUrl = null;
                    }
                    break;
                case StaticHandleC.GameDone:
                    mHandle = int.Parse(lines[1]);
                    break;
                case StaticHandleC.BrowserDone:
                    restartUrl = lines[1];
                    Send(StaticHandleS.CloseGame);
                    break;
            }
        }

        public bool Send(string msg)
        {
            if(process.HasExited) { return false; }
            process.StandardInput.WriteLine(msg);
            return true;
        }

    }

    public class FileReadException : Exception
    {
        public FileReadException(string message) : base(message)
        {
        }
    }

    class EngineShell
    {
        static bool is_check = false;
        const string engine_file = @"ZeroEngine.exe";
        public static Process CheckEngineSafe()
        {
            if (!is_check && EngineManager.CheckEmpy())
            {
                string? now_bit;
                using (SHA256 sha256 = SHA256.Create())
                {
                    using (FileStream fileStream = File.OpenRead(engine_file))
                    {
                        byte[] hashBytes = sha256.ComputeHash(fileStream);
                        now_bit = BitConverter.ToString(hashBytes).Replace("-", string.Empty);
                    }
                }
                if (EngineCacheSha.Get() != now_bit)
                {
                    throw new FileReadException("无法读取文件内容");
                }
            }
            is_check = true;
            var process = new Process
            {
                StartInfo = new ProcessStartInfo
                {
                    FileName = engine_file,
                    Arguments = StaticHandleA.GameMode,
                    UseShellExecute = false,
                    CreateNoWindow = true,
                    RedirectStandardInput = true,
                    RedirectStandardOutput = true
                },
                EnableRaisingEvents = true
            };
            return process;
        }
    }
}