using System.IO;
using System.Text.RegularExpressions;
using System.Diagnostics;
using DBObj;
using OverlayFormObj;
using NAudio.Wave;
namespace DualScreenDemo
{
    public class CommandHandler
    {
        public static bool readyForSongListInput = false;
        /* 關機 queue */
        private readonly int _maxHistoryLength = 6; // 最多保留 6 筆
        public static readonly Queue<string> _indataHistory = new Queue<string>();
        /* 顯示按鈕設定 */
        private int _wrongInputCountfor62 = 0; // 錯誤輸入計數器
        private int _wrongInputCountfor61 = 0; // 錯誤輸入計數器
        private const int MaxWrongLimit = 3; // 錯誤輸入限制次數
        private readonly SongListManager songListManager;

        public CommandHandler(SongListManager songListManager)
        {
            this.songListManager = songListManager;
        }
        /// <summary>
        /// 遙控器接收資料
        /// </summary>
        public async Task ProcessData(string indata)
        {   AddToHistory(indata);
            // 遙控器測試
            // Console.WriteLine($"[{DateTime.Now:HH:mm:ss.fff}] 遙控器: {indata}");
            switch (indata)
            {
                case "A261A4": // 輸入
                    HandleInputA();
                    break;
                case "A262A4": // 插播
                    HandleInputB();
                    break;
                case "A263A4":
                    ClearDisplay();
                    _wrongInputCountfor62 = 0; // 重置計數器
                    _wrongInputCountfor61 = 0; // 重置計數器
                    _indataHistory.Clear(); // 清空歷史紀錄
                    break;
                case "A268A4":
                    OverlayForm.MainForm.currentPage = 1;
                    DisplaySongHistory();
                    break;
                case "A26AA4":
                    PreviousPage();
                    break;
                case "A26BA4":
                    NextPage();
                    break;
                case "A271A4":
                    HandleNewSongAnnouncements();
                    break;
                case "A273A4":
                    HandleHotSongAnnouncements();
                    break;
                case "A267A4":
                    SkipToNextSong();
                    ClearDisplay();
                    break;
                case "A269A4":
                    ReplayCurrentSong();
                    break;
                // 原唱
                case "A26CA4":
                    Console.WriteLine("ToggleVocalRemoval Invoked");
                    SafeInvokeAction("A26CA4",() => VideoPlayerForm.Instance.ToggleVocalRemoval());
                    break;
                // 導唱
                case "A26EA4":
                    SafeInvokeAction("A26EA4",() => VideoPlayerForm.Instance.ToggleVocalRemoval());
                    break;
                case "A26DA4":
                    PauseOrResumeSong();
                    break;
                case "A276A4":
                    ToggleMute();
                    break;
                case "A274A4":
                    OverlayForm.MainForm.currentPage = 1;
                    HandleArtistAnnouncements();
                    break;
                case "A2B3A4":
                    SafeInvokeAction("A2B3A4",() => OverlayForm.MainForm.HideAllLabels());
                    SafeInvokeAction("A2B3A4",() => OverlayForm.MainForm.ShowVolumeUpLabel());
                    break;
                case "A2B4A4":
                    SafeInvokeAction("A2B4A4",() => OverlayForm.MainForm.HideAllLabels());
                    SafeInvokeAction("A2B4A4",() => OverlayForm.MainForm.ShowVolumeDownLabel());
                    break;
                case "A2B5A4":
                    SafeInvokeAction("A2B5A4",() => OverlayForm.MainForm.HideAllLabels());
                    SafeInvokeAction("A2B5A4",() => OverlayForm.MainForm.ShowMicUpLabel());
                    break;
                case "A2B6A4":
                    SafeInvokeAction("A2B6A4",() => OverlayForm.MainForm.HideAllLabels());
                    SafeInvokeAction("A2B6A4",() => OverlayForm.MainForm.ShowMicDownLabel());
                    break;
                case "A2C2A4":
                    SafeInvokeAction("A2C2A4",() => OverlayForm.MainForm.HidemicLabels());
                    SafeInvokeAction("A2C2A4",() => OverlayForm.MainForm.ShowStandardLabel());
                    break;
                case "A2C3A4":
                    SafeInvokeAction("A2C3A4",() => OverlayForm.MainForm.HidemicLabels());
                    SafeInvokeAction("A2C3A4",() => OverlayForm.MainForm.ShowProfessionalLabel());
                    break;
                case "A2C4A4":
                    SafeInvokeAction("A2C4A4",() => OverlayForm.MainForm.HidemicLabels());
                    SafeInvokeAction("A2C4A4",() => OverlayForm.MainForm.ShowSquareLabel());
                    break;
                case "A2C1A4":
                    SafeInvokeAction("A2C1A4",() => OverlayForm.MainForm.HidemicLabels());
                    SafeInvokeAction("A2C1A4",() => OverlayForm.MainForm.ShowSingDownLabel());
                    break;
                case "A2D5A4":
                    SafeInvokeAction("A2D5A4",() => OverlayForm.MainForm.HideAllLabels());
                    SafeInvokeAction("A2D5A4",() => OverlayForm.MainForm.ShowBrightLabel());
                    break;
                case "A2D7A4":
                    SafeInvokeAction("A2D7A4",() => OverlayForm.MainForm.HideAllLabels());
                    SafeInvokeAction("A2D7A4",() => OverlayForm.MainForm.ShowRomanticLabel());
                    break;
                /* case "A27CA4":
                     InvokeAction(() => OverlayForm.MainForm.ShowMaleKeyLabel());
                     break;
                 case "A282A4":
                     InvokeAction(() => OverlayForm.MainForm.ShowFemaleKeyLabel());
                     break;*/
                case "A2D6A4":
                    SafeInvokeAction("A2D6A4",() => OverlayForm.MainForm.HideAllLabels());
                    SafeInvokeAction("A2D6A4",() => OverlayForm.MainForm.ShowSoftLabel());
                    break;
                case "A2D8A4":
                    SafeInvokeAction("A2D8A4",() => OverlayForm.MainForm.HideAllLabels());
                    SafeInvokeAction("A2D8A4",() => OverlayForm.MainForm.ShowDynamicLabel());
                    break;
                case "A275A4":
                    SafeInvokeAction("A275A4",() => OverlayForm.MainForm.HideAllLabels());
                    SafeInvokeAction("A275A4",() => OverlayForm.MainForm.ShowTintLabel());
                    break;
                case "A283A4":
                    SafeInvokeAction("A283A4",() => OverlayForm.MainForm.HideAllLabels());
                    SafeInvokeAction("A283A4",() => OverlayForm.MainForm.ShowKeyUpLabel("↑升4調"));
                    break;
                case "A282A4":
                    SafeInvokeAction("A282A4",() => OverlayForm.MainForm.HideAllLabels());
                    SafeInvokeAction("A282A4",() => OverlayForm.MainForm.ShowKeyUpLabel("↑升3調"));
                    break;
                case "A281A4":
                    SafeInvokeAction("A281A4",() => OverlayForm.MainForm.HideAllLabels());
                    SafeInvokeAction("A281A4",() => OverlayForm.MainForm.ShowKeyUpLabel("↑升2調"));
                    break;
                case "A280A4":
                    SafeInvokeAction("A280A4",() => OverlayForm.MainForm.HideAllLabels());
                    SafeInvokeAction("A280A4",() => OverlayForm.MainForm.ShowKeyUpLabel("↑升1調"));
                    break;
                case "A27FA4":
                    SafeInvokeAction("A27FA4",() => OverlayForm.MainForm.HideAllLabels());
                    SafeInvokeAction("A27FA4",() => OverlayForm.MainForm.ShowStandardKeyLabel());
                    break;
                case "A27EA4":
                    SafeInvokeAction("A27EA4",() => OverlayForm.MainForm.HideAllLabels());
                    SafeInvokeAction("A27EA4",() => OverlayForm.MainForm.ShowKeyDownLabel("↓降1調"));
                    break;
                case "A27DA4":
                    SafeInvokeAction("A27EA4",() => OverlayForm.MainForm.HideAllLabels());
                    SafeInvokeAction("A27EA4",() => OverlayForm.MainForm.ShowKeyDownLabel("↓降2調"));
                    break;
                case "A27CA4":
                    SafeInvokeAction("A27CA4",() => OverlayForm.MainForm.HideAllLabels());
                    SafeInvokeAction("A27CA4",() => OverlayForm.MainForm.ShowKeyDownLabel("↓降3調"));
                    break;
                case "A27BA4":
                    SafeInvokeAction("A27BA4",() => OverlayForm.MainForm.HideAllLabels());
                    SafeInvokeAction("A27BA4",() => OverlayForm.MainForm.ShowKeyDownLabel("↓降4調"));
                    break;
                case "A266A4":
                    SafeInvokeAction("A266A4",() => OverlayForm.MainForm.HideAllLabels());
                    SafeInvokeAction("A266A4",() => OverlayForm.MainForm.ShowServiceBell());
                    break;
                default:
                    if (Regex.IsMatch(indata, @"^A23\d+A4$"))
                    {
                        HandleNumberInput(indata);
                    }
                    break;
            }
            
        }
        private void SafeInvokeAction(string commandKey, Action action)
        {
            // 真正執行 UI 操作
            if (OverlayForm.MainForm.InvokeRequired)
            {
                OverlayForm.MainForm.BeginInvoke(action);
            }
            else
            {
                action();
            }
        }

        private void AddToHistory(string indata)
        {
            if (_indataHistory.Count >= _maxHistoryLength)
            {
                _indataHistory.Dequeue(); // 移除最舊的項目
            }
            _indataHistory.Enqueue(indata); // 添加新的項目
            CheckSequenceforClose(); // 每次更新完 queue 後檢查
        }
        private void CheckSequenceforClose()
        {
            string[] targetSequence = { "A262A4", "A262A4", "A262A4", "A261A4", "A261A4", "A261A4" };

            if (_indataHistory.Count == targetSequence.Length &&
                _indataHistory.SequenceEqual(targetSequence))
            {
                Console.WriteLine("Shutdown condition met. Application will now close.");
                ShutdownComputer();
            }
        }

        void InvokeAction(Action action)
        {
            if (OverlayForm.MainForm.InvokeRequired)
            {
                OverlayForm.MainForm.Invoke(action);
            }
            else
            {
                action();
            }
        }

        
        
        private static void SkipToNextSong()
        {
            if (PrimaryForm.Instance.InvokeRequired)
            {
                PrimaryForm.Instance.Invoke(new System.Action(() => PrimaryForm.Instance.videoPlayerForm.SkipToNextSong()));
            }
            else
            {
                PrimaryForm.Instance.videoPlayerForm.SkipToNextSong();
            }

            OverlayForm.MainForm.Invoke(new System.Action(() => 
            {
                OverlayForm.MainForm.ShowStandardLabel();
            }));
        }


        private static void ReplayCurrentSong()
        {
            if (PrimaryForm.Instance.InvokeRequired)
            {
                PrimaryForm.Instance.Invoke(new System.Action(() => PrimaryForm.Instance.videoPlayerForm.ReplayCurrentSong()));
            }
            else
            {
                PrimaryForm.Instance.videoPlayerForm.ReplayCurrentSong();
            }
        }

        private static void PauseOrResumeSong()
        {
            if (PrimaryForm.Instance.InvokeRequired)
            {
                PrimaryForm.Instance.Invoke(new System.Action(() => PrimaryForm.Instance.videoPlayerForm.PauseOrResumeSong()));
            }
            else
            {
                PrimaryForm.Instance.videoPlayerForm.PauseOrResumeSong();
            }
        }

        public static void ToggleMute()
        {
            if (VideoPlayerForm.Instance.InvokeRequired)
            {
                VideoPlayerForm.Instance.Invoke(new System.Action(ToggleMute));
            }
            else
            {
                if (VideoPlayerForm.Instance.isMuted)
                {
                    
                    VideoPlayerForm.Instance.SetVolume(VideoPlayerForm.Instance.previousVolume);
                    
                    VideoPlayerForm.Instance.isMuted = false;
                    OverlayForm.MainForm.Invoke(new System.Action(() => OverlayForm.MainForm.HideMuteLabel())); 
                }
                else
                {
                    
                    VideoPlayerForm.Instance.previousVolume = VideoPlayerForm.Instance.GetVolume();
                    VideoPlayerForm.Instance.SetVolume(-10000);
                    
                    VideoPlayerForm.Instance.isMuted = true;
                    OverlayForm.MainForm.Invoke(new System.Action(() => OverlayForm.MainForm.ShowMuteLabel())); 
                }
            }
        }

        
        private void HandleInputA()
        {
            
            
            OverlayForm.displayTimer.Stop();
            string input = "a"; 

            // 輸入歌曲
            string songNumber = OverlayForm.ReadSongNumber();
            //Console.WriteLine("輸入A " + songNumber + " readyForSongListInput : " + readyForSongListInput); 
            var song = songListManager.SearchSongByNumber(songNumber); 
            
            
            
            if (readyForSongListInput)
            {
                
                if (OverlayForm.MainForm.InvokeRequired)
                {
                    OverlayForm.MainForm.Invoke(new System.Action(() =>
                    {
                        Console.WriteLine("F sign for input :" + input);
                        OverlayForm.MainForm.OnUserInput(input);  
                    }));
                }
                else
                {
                    Console.WriteLine("A sign for input :" + input);
                    OverlayForm.MainForm.OnUserInput(input);
                }
            }
            else
            {
                if (OverlayForm.MainForm.InvokeRequired)
                {
                    OverlayForm.MainForm.Invoke(new System.Action(() =>
                    {
                        if (song != null)
                        {
                            ClearDisplay();
                            OverlayForm.MainForm.displayLabel.Text = String.Format("已點歌曲:{0}", song);
                            OverlayForm.MainForm.AddSongToPlaylist(song);
                            OverlayForm.MainForm.nextSongLabel.Visible = false;
                            OverlayForm.displayTimer.Start();
                        }
                        else
                        {
                            ClearDisplay();
                            _wrongInputCountfor61++;
                            if(_wrongInputCountfor61 <= MaxWrongLimit)
                            {
                                string old ="";
                                OverlayForm.MainForm.displayLabel.Text = check_control(old);
                            }
                            else
                            {
                                OverlayForm.MainForm.displayLabel.Text = "輸入錯誤!!!";
                                _indataHistory.Clear(); // 清空歷史紀錄
                                _wrongInputCountfor61 = 0; // 重置計數器
                            }
                            OverlayForm.MainForm.nextSongLabel.Visible = false;
                            OverlayForm.displayTimer.Start();
                        }
                    }));
                }
                else
                {
                    if (song != null)
                    {
                        ClearDisplay();
                        OverlayForm.MainForm.displayLabel.Text = String.Format("{0}", song);
                        OverlayForm.MainForm.AddSongToPlaylist(song);
                        OverlayForm.MainForm.nextSongLabel.Visible = false;
                        OverlayForm.displayTimer.Start();
                    }
                    else
                    {
                        ClearDisplay();
                        _wrongInputCountfor61++;
                            if(_wrongInputCountfor61 <= MaxWrongLimit)
                            {
                                string old ="";
                                OverlayForm.MainForm.displayLabel.Text = check_control(old);
                            }
                            else
                            {
                                OverlayForm.MainForm.displayLabel.Text = "輸入錯誤!!!";
                                _indataHistory.Clear(); // 清空歷史紀錄
                                _wrongInputCountfor61 = 0; // 重置計數器
                            }
                        OverlayForm.MainForm.nextSongLabel.Visible = false;
                        OverlayForm.displayTimer.Start();
                    }
                }
            }
        }
        private string check_control(string old){
            foreach(string item in _indataHistory)
                            {
                                if(item == "A261A4")
                                    old += "#";
                                else if(item == "A262A4")
                                    old += "*";
                            }
            return old;
        }

        
        private void HandleInputB()
        {
            
            OverlayForm.displayTimer.Stop();
            string input = "b"; 

            
            string songNumber = OverlayForm.ReadSongNumber(); 
            var song = songListManager.SearchSongByNumber(songNumber); 
            
            
            
            if (readyForSongListInput)
            {
                
                if (OverlayForm.MainForm.InvokeRequired)
                {
                    OverlayForm.MainForm.Invoke(new System.Action(() =>
                    {
                        Console.WriteLine("B sign for input :" + input);
                        OverlayForm.MainForm.OnUserInput(input);  
                    }));
                }
                else
                {
                    Console.WriteLine("C sign for input :" + input);
                    OverlayForm.MainForm.OnUserInput(input);
                }
            }
            else
            {
                if (OverlayForm.MainForm.InvokeRequired)
                {
                    OverlayForm.MainForm.Invoke(new System.Action(() =>
                    {
                        if (song != null)
                        {
                            ClearDisplay();
                            OverlayForm.MainForm.displayLabel.Text = String.Format("插播歌曲{0}", song);
                            OverlayForm.MainForm.InsertSongToPlaylist(song);
                            OverlayForm.MainForm.nextSongLabel.Visible = false;
                            OverlayForm.displayTimer.Start();
                        }
                        else
                        {
                            ClearDisplay();
                            _wrongInputCountfor62++;
                            if(_wrongInputCountfor62 <= MaxWrongLimit)
                            {
                                string old ="";
                                OverlayForm.MainForm.displayLabel.Text = check_control(old);
                            }
                            else
                            {
                                OverlayForm.MainForm.displayLabel.Text = "輸入錯誤!!!";
                                _indataHistory.Clear(); // 清空歷史紀錄
                                _wrongInputCountfor62 = 0; // 重置計數器
                            }
                            OverlayForm.MainForm.nextSongLabel.Visible = false;
                            OverlayForm.displayTimer.Start();
                        }
                    }));
                }
                else
                {
                    if (song != null)
                    {
                        ClearDisplay();
                        OverlayForm.MainForm.displayLabel.Text = String.Format("已點歌曲:{0}", song);
                        OverlayForm.MainForm.nextSongLabel.Visible = false;
                    }
                    else
                    {
                        ClearDisplay();
                        _wrongInputCountfor62++;
                            if(_wrongInputCountfor62 <= MaxWrongLimit)
                            {
                                string old ="";
                                OverlayForm.MainForm.displayLabel.Text = check_control(old);
                            }
                            else
                            {
                                OverlayForm.MainForm.displayLabel.Text = "輸入錯誤!!!";
                                _indataHistory.Clear(); // 清空歷史紀錄
                                _wrongInputCountfor62 = 0; // 重置計數器
                            }
                        OverlayForm.MainForm.nextSongLabel.Visible = false;
                        OverlayForm.displayTimer.Start();
                    }
                }
            }
        }

        /// <summary>
        /// 清除 OverlayForm 上除特定保留控制項外的所有控制項，並重設顯示狀態
        /// </summary>
        private static void ClearDisplay()
        {
            // 停止顯示用的計時器
            OverlayForm.displayTimer.Stop();

            // 判斷是否需要透過 Invoke 回 UI 執行緒執行
            if (OverlayForm.MainForm.InvokeRequired)
            {
                OverlayForm.MainForm.Invoke(new Action(ClearControlsAndReset));
            }
            else
            {
                ClearControlsAndReset();
            }
        }

        /// <summary>
        /// 實際執行移除不需要的控制項並重設 UI 狀態
        /// </summary>
        private static void ClearControlsAndReset()
        {
            // 保留不刪除的控制項列表
            var preservedControls = new HashSet<Control>
            {
                OverlayForm.MainForm.displayLabel,
                OverlayForm.MainForm.pauseLabel,
                OverlayForm.MainForm.muteLabel,
                OverlayForm.MainForm.volumeUpLabel,
                OverlayForm.MainForm.volumeDownLabel,
                OverlayForm.MainForm.micUpLabel,
                OverlayForm.MainForm.micDownLabel,
                OverlayForm.MainForm.standardKeyLabel,
                OverlayForm.MainForm.keyUpLabel,
                OverlayForm.MainForm.keyDownLabel,
                OverlayForm.MainForm.maleKeyLabel,
                OverlayForm.MainForm.femaleKeyLabel,
                OverlayForm.MainForm.squareLabel,
                OverlayForm.MainForm.professionalLabel,
                OverlayForm.MainForm.standardLabel,
                OverlayForm.MainForm.singDownLabel,
                OverlayForm.MainForm.brightLabel,
                OverlayForm.MainForm.softLabel,
                OverlayForm.MainForm.autoLabel,
                OverlayForm.MainForm.romanticLabel,
                OverlayForm.MainForm.dynamicLabel,
                OverlayForm.MainForm.tintLabel,
                OverlayForm.MainForm.blackBackgroundPanel,
                OverlayForm.MainForm.nextSongLabel
            };

            // 將所有不在保留清單內的控制項移除並釋放資源
            foreach (var control in OverlayForm.MainForm.Controls.OfType<Control>().ToArray())
            {
                if (!preservedControls.Contains(control))
                {
                    OverlayForm.MainForm.Controls.Remove(control);
                    control.Dispose();
                }
            }

            // 清空主顯示區的文字
            OverlayForm.MainForm.displayLabel.Text = "";
            Console.WriteLine("ClearDisplay called.");

            // 重設狀態標記與 UI 狀態
            // 嘗試 true
            readyForSongListInput = true;
            OverlayForm.SetUIState(OverlayForm.UIState.Initial);
            Console.WriteLine("Display cleared.");
        }

        private static void DisplaySongHistory()
        {
            // 清除畫面上現有的顯示內容
            ClearDisplay();

            // 設定歌曲總數為已播放歌曲的數量
            OverlayForm.MainForm.totalSongs = PrimaryForm.playedSongsHistory.Count;

            // 若無任何播放紀錄，直接顯示訊息並返回，不執行後續動作
            if (OverlayForm.MainForm.totalSongs == 0)
            {
                Console.WriteLine("No song history available.");
                return;
            }

            // 計算總頁數，每頁顯示 songsPerPage 首歌，使用天花板函數確保不足一頁也算一頁
            int totalPages = (int)Math.Ceiling(OverlayForm.MainForm.totalSongs / (double)OverlayForm.MainForm.songsPerPage);

            // 計算當前頁面要顯示的歌的起始與結束索引
            int startIndex = (OverlayForm.MainForm.currentPage - 1) * OverlayForm.MainForm.songsPerPage;
            int endIndex = Math.Min(startIndex + OverlayForm.MainForm.songsPerPage, OverlayForm.MainForm.totalSongs);

            // 準備要傳給 UpdateHistoryLabel 的兩個清單：歌曲資料與播放狀態
            List<SongData> historySongs = new List<SongData>();
            List<PlayState> playStates = new List<PlayState>();
            // 錨點 遙控器
            // 從播放紀錄中取出當前頁面應顯示的歌曲與狀態
            int completedCount = PrimaryForm.currentSongIndexInHistory;
            // 判斷是否正在播放公播歌單 (若用戶點播歌單為空，則播放公播歌單)
            bool isPlayingPublicList = PrimaryForm.userRequestedSongs.Count == 0 || 
                        (PrimaryForm.currentSongIndexInHistory >= PrimaryForm.userRequestedSongs.Count - 1 && PrimaryForm.Instance.videoPlayerForm.IsPlayingPublicSong);
            if (isPlayingPublicList)
            {
                for (int i = startIndex; i < endIndex; i++)
                {
                    historySongs.Add(PrimaryForm.playedSongsHistory[i]); // 加入歌曲
                    playStates.Add(PlayState.Played);                   
                }
            }
            else
            { 
                for (int i = startIndex; i < endIndex; i++)
                {

                    historySongs.Add(PrimaryForm.playedSongsHistory[i]); // 加入歌曲
                    if (i < completedCount)
                    {
                        playStates.Add(PlayState.Played);
                    }
                    else if (i == completedCount)
                    {
                        playStates.Add(PlayState.Playing);
                    }
                    else
                    {
                        playStates.Add(PlayState.NotPlayed);
                    }
                }
            } 




            // 安全更新 UI：若非 UI 執行緒則使用 Invoke 切換
            if (OverlayForm.MainForm.InvokeRequired)
            {
                OverlayForm.MainForm.Invoke(new System.Action(() =>
                {
                    // 更新主畫面的歷史播放顯示區
                    OverlayForm.MainForm.UpdateHistoryLabel(historySongs, playStates, OverlayForm.MainForm.currentPage, totalPages);

                    // 隱藏下一首提示
                    OverlayForm.MainForm.nextSongLabel.Visible = false;
                }));
            }
            else
            {
                // 若已在 UI 執行緒，直接操作
                OverlayForm.MainForm.UpdateHistoryLabel(historySongs, playStates, OverlayForm.MainForm.currentPage, totalPages);
                OverlayForm.MainForm.nextSongLabel.Visible = false;
            }

            // 切換 UI 狀態為播放歷史模式（可做為內部狀態管理用途）
            OverlayForm.SetUIState(OverlayForm.UIState.PlayHistory);
        }




        private static void PreviousPage()
        {
            if (OverlayForm.CurrentUIState == OverlayForm.UIState.SelectingSong)
            {
                
                if (OverlayForm.MainForm.InvokeRequired)
                {
                    OverlayForm.MainForm.Invoke(new System.Action(() =>
                    {
                        
                        OverlayForm.MainForm.PreviousPage();
                    }));
                }
                else
                {
                    
                    OverlayForm.MainForm.PreviousPage();
                }
            }
            else if (OverlayForm.CurrentUIState == OverlayForm.UIState.SelectingArtist)
            {
                
                if (OverlayForm.MainForm.InvokeRequired)
                {
                    OverlayForm.MainForm.Invoke(new System.Action(() =>
                    {
                        
                        OverlayForm.MainForm.PreviousPage();
                    }));
                }
                else
                {
                    
                    OverlayForm.MainForm.PreviousPage();
                }
            }
            else if (OverlayForm.CurrentUIState == OverlayForm.UIState.PlayHistory)
            {
                if (OverlayForm.MainForm.currentPage > 1)
                {    
                    OverlayForm.MainForm.currentPage--;

                    if (OverlayForm.MainForm.InvokeRequired)
                    {
                        OverlayForm.MainForm.Invoke(new System.Action(() =>
                        {
                            DisplaySongHistory();
                        }));
                    }
                    else
                    {
                        DisplaySongHistory();
                    }
                }
            }
            else
            {
                Console.WriteLine("Page turning is not allowed in the current state.");
            }
        }

        private static void NextPage()
        {
            if (OverlayForm.CurrentUIState == OverlayForm.UIState.SelectingSong)
            {
                
                if (OverlayForm.MainForm.InvokeRequired)
                {
                    OverlayForm.MainForm.Invoke(new System.Action(() =>
                    {
                        
                        OverlayForm.MainForm.NextPage();
                    }));
                }
                else
                {
                    
                    OverlayForm.MainForm.NextPage();
                }
            }
            else if (OverlayForm.CurrentUIState == OverlayForm.UIState.SelectingArtist)
            {
                
                if (OverlayForm.MainForm.InvokeRequired)
                {
                    OverlayForm.MainForm.Invoke(new System.Action(() =>
                    {
                        
                        OverlayForm.MainForm.NextPage();
                    }));
                }
                else
                {
                    
                    OverlayForm.MainForm.NextPage();
                }
            }
            else if (OverlayForm.CurrentUIState == OverlayForm.UIState.PlayHistory)
            {
                if (OverlayForm.MainForm.currentPage * OverlayForm.MainForm.songsPerPage < OverlayForm.MainForm.totalSongs)
                {    
                    OverlayForm.MainForm.currentPage++;
                    if (OverlayForm.CurrentUIState == OverlayForm.UIState.PlayHistory)
                    {
                        if (OverlayForm.MainForm.InvokeRequired)
                        {
                            OverlayForm.MainForm.Invoke(new System.Action(() =>
                            {
                                DisplaySongHistory();
                            }));
                        }
                        else
                        {
                            DisplaySongHistory();
                        }
                    }
                }
            }
            else
            {
                Console.WriteLine("Page turning is not allowed in the current state.");
            }
        }

        private static void HandleNewSongAnnouncements()
        {
            ClearDisplay();

            
            OverlayForm.CurrentCategory = OverlayForm.Category.NewSongs;

            
            string[] messages = new string[]
            {
                "新歌快訊",
                "1. 國語",
                "2. 台語",
                "3. 粵語",
                "4. 英語",
                "5. 日語",
                "6. 韓語",
            };

            
            readyForSongListInput = true;

            
            OverlayForm.SetUIState(OverlayForm.UIState.SelectingLanguage);

            
            UpdateDisplayLabels(messages);
        }

        private static void HandleHotSongAnnouncements()
        {
            ClearDisplay();

            
            OverlayForm.CurrentCategory = OverlayForm.Category.HotSongs;

            
            string[] messages = new string[]
            {
                "熱門排行",
                "1. 國語",
                "2. 台語",
                "3. 粵語",
                "4. 英語",
                "5. 日語",
                "6. 韓語",
            };

            
            readyForSongListInput = true;

            
            OverlayForm.SetUIState(OverlayForm.UIState.SelectingLanguage);

            
            UpdateDisplayLabels(messages);
        }

        private static void HandleArtistAnnouncements()
        {
            ClearDisplay();

            
            OverlayForm.CurrentCategory = OverlayForm.Category.Artists;

            
            string[] messages = new string[]
            {
                "歌星選歌",
                "1.男歌星",
                "2.女歌星",
                "3.團體",
                "4.外語",
                "5.全部",
            };

            
            readyForSongListInput = true;

            
            OverlayForm.SetUIState(OverlayForm.UIState.SelectingArtistCategory);

            
            UpdateDisplayLabels(messages);
        }

        private static void UpdateDisplayLabels(string[] messages)
        {
            if (OverlayForm.MainForm.InvokeRequired)
            {
                OverlayForm.MainForm.Invoke(new System.Action(() =>
                {
                    
                    foreach (var control in OverlayForm.MainForm.Controls.OfType<Control>().ToArray())
                    {
                        if (control != OverlayForm.MainForm.displayLabel &&
                            control != OverlayForm.MainForm.pauseLabel &&
                            control != OverlayForm.MainForm.muteLabel &&
                            control != OverlayForm.MainForm.volumeUpLabel &&
                            control != OverlayForm.MainForm.volumeDownLabel &&
                            control != OverlayForm.MainForm.micUpLabel &&
                            control != OverlayForm.MainForm.micDownLabel &&
                            control != OverlayForm.MainForm.standardKeyLabel &&
                            control != OverlayForm.MainForm.keyUpLabel &&
                            control != OverlayForm.MainForm.keyDownLabel &&
                            control != OverlayForm.MainForm.maleKeyLabel &&
                            control != OverlayForm.MainForm.femaleKeyLabel &&
                            control != OverlayForm.MainForm.squareLabel &&
                            control != OverlayForm.MainForm.professionalLabel &&
                            control != OverlayForm.MainForm.standardLabel &&
                            control != OverlayForm.MainForm.singDownLabel &&
                            control != OverlayForm.MainForm.brightLabel &&
                            control != OverlayForm.MainForm.softLabel &&
                            control != OverlayForm.MainForm.autoLabel &&
                            control != OverlayForm.MainForm.romanticLabel &&
                            control != OverlayForm.MainForm.dynamicLabel &&
                            control != OverlayForm.MainForm.tintLabel &&
                            control != OverlayForm.MainForm.blackBackgroundPanel &&
                            control != OverlayForm.MainForm.nextSongLabel) 
                        {
                            OverlayForm.MainForm.Controls.Remove(control);
                            control.Dispose();
                        }
                    }
                    OverlayForm.MainForm.UpdateDisplayLabels(messages);
                }));
            }
            else
            {
                
                foreach (var control in OverlayForm.MainForm.Controls.OfType<Control>().ToArray())
                {
                    if (control != OverlayForm.MainForm.displayLabel &&
                        control != OverlayForm.MainForm.pauseLabel &&
                        control != OverlayForm.MainForm.muteLabel &&
                        control != OverlayForm.MainForm.volumeUpLabel &&
                        control != OverlayForm.MainForm.volumeDownLabel &&
                        control != OverlayForm.MainForm.micUpLabel &&
                        control != OverlayForm.MainForm.micDownLabel &&
                        control != OverlayForm.MainForm.standardKeyLabel &&
                        control != OverlayForm.MainForm.keyUpLabel &&
                        control != OverlayForm.MainForm.keyDownLabel &&
                        control != OverlayForm.MainForm.maleKeyLabel &&
                        control != OverlayForm.MainForm.femaleKeyLabel &&
                        control != OverlayForm.MainForm.squareLabel &&
                        control != OverlayForm.MainForm.professionalLabel &&
                        control != OverlayForm.MainForm.standardLabel &&
                        control != OverlayForm.MainForm.singDownLabel &&
                        control != OverlayForm.MainForm.brightLabel &&
                        control != OverlayForm.MainForm.softLabel &&
                        control != OverlayForm.MainForm.autoLabel &&
                        control != OverlayForm.MainForm.romanticLabel &&
                        control != OverlayForm.MainForm.dynamicLabel &&
                        control != OverlayForm.MainForm.tintLabel &&
                        control != OverlayForm.MainForm.blackBackgroundPanel &&
                        control != OverlayForm.MainForm.nextSongLabel)
                    {
                        OverlayForm.MainForm.Controls.Remove(control);
                        control.Dispose();
                    }
                }
                OverlayForm.MainForm.UpdateDisplayLabels(messages);
            }
        }

        private static void HandleNumberInput(string trimmedData)
        {
            string number = trimmedData; 

            
            var match = Regex.Match(trimmedData, @"^A23(\d)A4$");
            if (match.Success)
            {
                number = match.Groups[1].Value;
                
                Console.WriteLine($"Handling number: {number}");
                
            }

            
            if (readyForSongListInput)
            {
                
                if (OverlayForm.MainForm.InvokeRequired)
                {
                    OverlayForm.MainForm.Invoke(new System.Action(() =>
                    {
                        Console.WriteLine("D sign for number :" + number);
                        OverlayForm.MainForm.OnUserInput(number);  
                    }));
                }
                else
                {
                    Console.WriteLine("E sign for number :" + number);
                    OverlayForm.MainForm.OnUserInput(number);
                }
                
            }
            else
            {
                
                if (OverlayForm.MainForm.InvokeRequired)
                {
                    OverlayForm.MainForm.Invoke(new System.Action(() =>
                    {
                        OverlayForm.DisplayNumberAtTopLeft(number);  
                        OverlayForm.MainForm.HideAllLabels(); 
                    }));
                }
                else
                {
                    OverlayForm.DisplayNumberAtTopLeft(number);
                    OverlayForm.MainForm.HideAllLabels(); 
                }
            }
        }

        public static void ShutdownComputer()
        {
            try
            {
                ProcessStartInfo processStartInfo = new ProcessStartInfo("cmd.exe", "/c shutdown /s /f /t 0") 
                {
                    CreateNoWindow = true,
                    UseShellExecute = false,
                    RedirectStandardOutput = true
                };
                Process process = Process.Start(processStartInfo);
                process.WaitForExit();
                Console.WriteLine("Computer is shutting down...");
            }
            catch (Exception ex)
            {
                Console.WriteLine("Error shutting down computer: " + ex.Message);
            }
        }
    }
}