using DBObj;
using System.IO;

namespace DualScreenDemo
{
    public partial class PrimaryForm : Form{
        public class MultiPagePanel : Panel
        {
            private const int ItemHeight = 70;
            private const int RowGap = 2;
            private int itemsPerPage  
            {
                get
                {
                    Screen screen = Screen.PrimaryScreen;
                    int screenWidth = screen.Bounds.Width;
                    int screenHeight = screen.Bounds.Height;
                    if(screenWidth==1440 && screenHeight==900)
                    {
                        return 14; 
                    }
                    else if(screenWidth==1024 && screenHeight==768)
                    {
                        return 12; 
                    }
                    else if(screenWidth == 1920 && screenHeight == 1080)
                    {
                        return 16; 
                    }
                    return 16; // 預設值
                }
            }
            private const float LeftColumnX = 0.03f;
            private const float RightColumnX = 0.52f;
            private const float SongWidth = 0.35f;
            private const float ArtistWidth = 0.12f;

            private int _currentPageIndex = 0;
            private bool _isSimplified = false;
            public bool IsSimplified
            {
                get { return _isSimplified; }
                set 
                { 
                    if (_isSimplified != value)
                    {
                        _isSimplified = value;
                        if(currentArtistList != null && currentArtistList.Count > 0)
                            RefreshDisplayBase_Singer();
                        else
                            RefreshDisplay();
                    }
                }
            }
            private bool _isShowingSinger = true;
            private List<SongData> currentSongList = new List<SongData>();
            public List<SongData> get_currentSongList(){
                return currentSongList;
            }
            private List<Artist> currentArtistList = new List<Artist>();
            private int _totalPages = 0;
            private Point mouseDownLocation;    // 新增字段
            private bool isDragging = false;    // 新增字段
            public event Action PageIndexChanged; // 新增事件    
            public int currentPageIndex
            {
                get { return _currentPageIndex; }
                set 
                {             
                    if (_currentPageIndex != value)
                    {
                        _currentPageIndex = value;
                        // 觸發事件，通知頁面索引已改變
                        PageIndexChanged?.Invoke();
                    } 
                }
            }
            public int totalPages
            {
                get { return _totalPages; }
                set 
                {             
                    if (_totalPages != value)
                    {
                        _totalPages = value;
                        // 觸發事件，通知頁面索引已改變
                        PageIndexChanged?.Invoke();
                    } 
                }
            }
                    
            public MultiPagePanel()
            {
                this.SetStyle(
                   ControlStyles.OptimizedDoubleBuffer |
                   ControlStyles.AllPaintingInWmPaint |
                   ControlStyles.UserPaint |
                   ControlStyles.ResizeRedraw,
                   true);
                this.BackColor = Color.FromArgb(64, 0, 0, 0);
                this.BorderStyle = BorderStyle.None;
                
                // 添加滑動事件
                this.MouseDown += MultiPagePanel_MouseDown;
                this.MouseMove += MultiPagePanel_MouseMove;
                this.MouseUp += MultiPagePanel_MouseUp;
            }

            private void MultiPagePanel_MouseDown(object sender, MouseEventArgs e)
            {
                if (e.Button == MouseButtons.Left)
                {
                    mouseDownLocation = e.Location;
                    isDragging = true;
                }
            }

            private void MultiPagePanel_MouseMove(object sender, MouseEventArgs e)
            {
                if (isDragging)
                {
                    int deltaX = e.X - mouseDownLocation.X;
                    if (Math.Abs(deltaX) > 20) // 滑動距離超過50像素才觸發
                    {
                        if (deltaX > 0 && currentPageIndex > 0)
                        {
                            // 向右滑動，上一頁
                            LoadPreviousPage();
                        }
                        else if (deltaX < 0 && currentPageIndex < totalPages - 1)
                        {
                            // 向左滑動，下一頁
                            LoadNextPage();
                        }
                        isDragging = false;
                    }
                }
            }
            private void MultiPagePanel_MouseUp(object sender, MouseEventArgs e)
            {
                isDragging = false;
            }
            public void LoadNextPage()
            {
                if (currentPageIndex < totalPages - 1)
                {
                    currentPageIndex++;
                    // 如果歌單為0(沒有歌單)，則刷新歌手列表
                    if(_isShowingSinger)
                    {
                        RefreshDisplayBase_Singer();
                    }
                    else
                    {
                        RefreshDisplay();
                    }
                }
            }
            public void LoadPreviousPage()
            {
                if (currentPageIndex - 1 >= 0)
                {
                    currentPageIndex--;
                    if(_isShowingSinger)
                    {
                        RefreshDisplayBase_Singer();
                    }
                    else
                    {
                        RefreshDisplay();
                    }
                }
            }

            public void LoadSongs(List<SongData> songs, bool clearHistory = false)
            {
                _isShowingSinger = false;
                currentSongList = songs;
                currentArtistList.Clear();
                currentPageIndex = 0;
                totalPages = (int)Math.Ceiling(songs.Count / (double)itemsPerPage);
                
                // 直接調用基礎刷新邏輯
                RefreshDisplayBase();
            }

            public void LoadSingers(List<Artist> artists)
            {
                _isShowingSinger = true;
                currentArtistList = artists;
                // currentSongList.Clear();
                currentPageIndex = 0;
                totalPages = (int)Math.Ceiling(artists.Count / (double)itemsPerPage);
                RefreshDisplayBase_Singer();
            }

            public void LoadPlayedSongs(List<SongData> songs, List<PlayState> states)
            {
                _isShowingSinger = false;
                currentSongList = songs;
                currentArtistList.Clear();
                currentPageIndex = 0;
                totalPages = (int)Math.Ceiling(songs.Count / (double)itemsPerPage);
                
                // 直接調用基礎刷新邏輯
                RefreshDisplayBase();
            }

            public void RefreshDisplay()
            {
                this.Controls.Clear();      // 清除所有 UI 元件
                RefreshDisplayBase();       // 重新建立 UI
                this.Invalidate();          // 通知系統需要重新繪製
            }

            private void RefreshDisplayBase()
            {
                if (this.InvokeRequired) // 確保 UI 操作在主執行緒執行
                {
                    this.Invoke(new Action(() => RefreshDisplayBase()));
                    return;
                }
                this.SuspendLayout();  // 暫停 UI 更新，提高效能
                this.Controls.Clear(); // 清空 UI (這裡會再清除一次)
                
                int startIndex = currentPageIndex * itemsPerPage;
                int endIndex = Math.Min(startIndex + itemsPerPage, currentSongList.Count);
                
                for (int i = startIndex; i < endIndex; i++)
                {
                    CreateSongLabel(currentSongList[i], i - startIndex, startIndex); // 這行負責新增 UI
                }
                this.ResumeLayout(); // 恢復 UI 更新
            }
            private void RefreshDisplayBase_Singer()
            {
                this.Controls.Clear(); 
                if (this.InvokeRequired) // 確保 UI 操作在主執行緒執行
                {
                    this.Invoke(new Action(() => RefreshDisplayBase_Singer()));
                    return;
                }
                this.SuspendLayout();  // 暫停 UI 更新，提高效能
                this.Controls.Clear(); // 清空 UI (這裡會再清除一次)
                
                int startIndex = currentPageIndex * itemsPerPage;
                int endIndex = Math.Min(startIndex + itemsPerPage, currentArtistList.Count);
                
                for (int i = startIndex; i < endIndex; i++)
                {
                    CreateSingerLabel(currentArtistList[i], i - startIndex, startIndex); // 這行負責新增 UI
                }
                this.ResumeLayout(); // 恢復 UI 更新
                this.Invalidate();   
            }
                
            private void CreateSingerLabel(Artist artist, int index, int pageOffset)
            {
                
                // 創建歌手標籤
                Label artistLabel = new Label();
                string artistText = IsSimplified ? 
                    (!string.IsNullOrEmpty(artist.NameSimplified) ? artist.NameSimplified : artist.Name) : 
                    artist.Name;
                artistLabel.Text = artistText;
                artistLabel.Tag = artist;
                artistLabel.AutoSize = false;
                
                // 計算文字寬度
                Font normalFont = new Font("微軟正黑體", 24, FontStyle.Bold);
                Font mediumFont = new Font("微軟正黑體", 18, FontStyle.Bold);
                Font smallFont = new Font("微軟正黑體", 14, FontStyle.Bold);

                // 根據文字長度設置字體大小
                if (artistLabel.Text.Length > 18)
                {
                    artistLabel.Font = smallFont;
                }
                else if (artistLabel.Text.Length > 13)
                {
                    artistLabel.Font = mediumFont;
                }
                else
                {
                    artistLabel.Font = normalFont;
                }
                Screen screen = Screen.PrimaryScreen;
                int screenWidth = screen.Bounds.Width;
                int screenHeight = screen.Bounds.Height;
                int NumberOfItem = (screenWidth, screenHeight) switch
                {
                    (1440, 900) => 7,
                    (1024, 768) => 6,
                    (1920, 1080) => 8,
                    _ => 8 // 預設值
                };
                // 計算位置 - 依照NumberOfItem來計算
                bool isLeftColumn = index < NumberOfItem;  
                int row = isLeftColumn ? index : index - NumberOfItem;  // 如果是右边,需要减去8来计算正确的行号
                float startX = isLeftColumn ? LeftColumnX : RightColumnX;
                int y = row * (ItemHeight + RowGap);
                // 計算歌手標籤的位置和大小
                int singerX = (int)(this.Width * startX);
                int singerWidth = (int)(this.Width * (SongWidth+ArtistWidth));
                // 字體顏色
                artistLabel.ForeColor = Color.White;
                // 標籤座標設定 
                artistLabel.Location = new Point(singerX, y);
                artistLabel.Size = new Size(singerWidth + 20, ItemHeight);
                
                Panel separatorPanel = new Panel
                {
                    Location = new Point(singerX , y + ItemHeight),
                    Size = new Size(singerWidth + 20, 2),
                    BackColor = Color.FromArgb(80, 255, 255, 255),
                    Name = "SeparatorPanel_" + index.ToString()
                };
                // 字體調整和字體背景顏色
                artistLabel.TextAlign = ContentAlignment.TopLeft;
                artistLabel.BackColor = Color.Transparent;
                
                // 設置滑鼠事件
                EventHandler mouseEnter = (sender, e) => {
                        // 變更歌手名稱為黃色
                        artistLabel.ForeColor = Color.Yellow;
                        // 增強分隔線的亮度，使其更明顯
                        separatorPanel.BackColor = Color.FromArgb(120, 255, 255, 255);
    
                };
                EventHandler mouseLeave = (sender, e) => {
                        // 還原歌手名稱為白色
                        artistLabel.ForeColor = Color.White;
                        // 還原分隔線的亮度
                        separatorPanel.BackColor = Color.FromArgb(80, 255, 255, 255);
                };
                artistLabel.Click += (sender, e) => 
                {
                    string searchText = artistLabel.Text; // 取得輸入內容
                    // 歌星 轉 歌曲
                    string query = IsSimplified ?
                                (
                                    !string.IsNullOrEmpty(artist.NameSimplified)? 
                                    $"SELECT * FROM song_library_cache WHERE artistA_simplified = '{searchText}' OR artistB_simplified = '{searchText}'"
                                    : $"SELECT * FROM song_library_cache WHERE artistA = '{searchText}' OR artistB = '{searchText}'"
                                )
                                : $"SELECT * FROM song_library_cache WHERE artistA = '{searchText}' OR artistB = '{searchText}'"
                                ;
                    //string query = $"SELECT * FROM song_library_cache WHERE artistA ='{searchText}' OR artistB='{searchText}' ";
                    var searchResults = PrimaryForm.Instance.SearchSongs_Mysql(query);
                    // 重置分頁
                    PrimaryForm.Instance.currentPage = 0;
                    currentSongList = searchResults;
                    totalPages = (int)Math.Ceiling((double)searchResults.Count / itemsPerPage);
                    // 更新多頁面面板的內容
                    PrimaryForm.Instance.multiPagePanel.currentPageIndex = 0;
                    PrimaryForm.Instance.multiPagePanel.LoadSongs(currentSongList);
                };
                // 添加滑鼠事件
                artistLabel.MouseEnter += mouseEnter;
                artistLabel.MouseLeave += mouseLeave;
                // 滑動
                artistLabel.MouseDown += MultiPagePanel_MouseDown;
                artistLabel.MouseMove += MultiPagePanel_MouseMove;
                artistLabel.MouseUp += MultiPagePanel_MouseUp;
                separatorPanel.MouseEnter += mouseEnter;
                separatorPanel.MouseLeave += mouseLeave;
                // 添加到畫面上
                this.Controls.Add(separatorPanel);
                this.Controls.Add(artistLabel);
                // 將歌手標籤置於最上層
                artistLabel.BringToFront();
                
            }

            private void CreateSongLabel(SongData song, int index, int pageOffset)
            {
                // 創建歌曲標籤
                Label songLabel = new Label();
                string statusText = ""; // 狀態文字
                
                bool isCurrentlyPlaying = false; // 是否正在播放
                bool hasBeenPlayed = false; // 是否已播放完成
                bool isLatestInstance = true; // 是否是最新的歌曲
                
                //  僅在 "已點歌曲" 頁面顯示播放狀態
                if (PrimaryForm.Instance.isOnOrderedSongsPage)
                {
                    // 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 = userRequestedSongs.Count == 0 || 
                        (currentSongIndexInHistory >= userRequestedSongs.Count - 1 && PrimaryForm.Instance.videoPlayerForm.IsPlayingPublicSong);
                    if (isPlayingPublicList)
                    {
                        // 若播放公播歌單，代表已點歌曲皆已播放完畢
                        hasBeenPlayed = true;
                        songLabel.ForeColor = Color.Gray;
                        statusText = IsSimplified ? "(播毕)" : "(播畢)";
                    }
                    else 
                    {
                        // 計算已完成播放的歌曲數量
                        int completedCount = currentSongIndexInHistory;
                        //Console.WriteLine("currentSongIndexInHistory:" + currentSongIndexInHistory);
                        // 遍歷已點歌曲歷史
                        /*for (int i = 0; i <= currentSongIndexInHistory && i < playedSongsHistory.Count; i++) {
                            if (i == currentSongIndexInHistory) {
                                completedCount = i + 1; // 当前播放的歌曲
                                break;
                            }
                            // 检查播放状态
                            if (i < playStates.Count) {
                                if (playStates[i] == PlayState.Played || playStates[i] == PlayState.Playing) {
                                    completedCount++;
                                }
                                // 如果是切歌状态，不增加计数
                            }
                        }*/
                        // 計算歌曲在歷史中的位置
                        int songPosition = pageOffset + index;
                        // 判斷歌曲狀態
                        if (songPosition < completedCount)
                        {
                            // 已播放完成
                            hasBeenPlayed = true;
                            songLabel.ForeColor = Color.Gray;
                            statusText = IsSimplified ? "(播毕)" : "(播畢)";
                        }
                        else if (songPosition == completedCount)
                        {
                            // 正在播放
                            isCurrentlyPlaying = true;
                            songLabel.ForeColor = Color.LimeGreen;
                            statusText = IsSimplified ? "(播放中)" : "(播放中)";
                        }
                        else
                        {
                            // 未播放
                            songLabel.ForeColor = Color.White;
                            statusText = string.Empty;
                        }
                    }
                }
                else
                {
                    // 未在 "已點歌曲" 頁面顯示白色
                    songLabel.ForeColor = Color.White;
                    statusText = string.Empty;
                }

                // 根據簡繁體設置選擇要顯示的文字
                string songText = song.getName(IsSimplified);

                // 歌手名稱設置點
                string artistText = song.getArtist_A(IsSimplified);
                
                string fullText = songText + statusText;
                int textLength = fullText.Length;
                
                // 計算文字寬度
                Font normalFont = new Font("微軟正黑體", 20, FontStyle.Bold);
                Font mediumFont = new Font("微軟正黑體", 14, FontStyle.Bold);
                Font smallFont = new Font("微軟正黑體", 12, FontStyle.Bold);
                // 根據文字長度設置字體大小
                if (textLength > 18)
                {
                    songLabel.Font = smallFont;
                }
                else if (textLength > 8)
                {
                    songLabel.Font = mediumFont;
                }
                else
                {
                    songLabel.Font = normalFont;
                }
                songLabel.Text = fullText;
                songLabel.Tag = song;
                songLabel.AutoSize = false;
                // 創建歌手標籤
                Label artistLabel = new Label();
                artistLabel.Text = artistText;
                artistLabel.Tag = song;
                artistLabel.AutoSize = false;
                Screen screen = Screen.PrimaryScreen;
                int screenWidth = screen.Bounds.Width;
                int screenHeight = screen.Bounds.Height;
                int NumberOfItem = 0;
                if(screenWidth==1440 && screenHeight==900)
                {
                    NumberOfItem = 7; 
                }
                else if(screenWidth==1024 && screenHeight==768)
                {
                    NumberOfItem = 6; 
                }
                else if(screenWidth == 1920 && screenHeight == 1080)
                {
                    NumberOfItem = 8; 
                }
                // 計算位置 - 依照NumberOfItem來計算
                bool isLeftColumn = index < NumberOfItem;  
                int row = isLeftColumn ? index : index - NumberOfItem;  
                float startX = isLeftColumn ? LeftColumnX : RightColumnX;
                int y = row * (ItemHeight + RowGap);
                // 設置位置和大小
                int songX = (int)(this.Width * startX);
                int songWidth = (int)(this.Width * SongWidth);
                int artistWidth = (int)(this.Width * ArtistWidth);
                int artistX = songX + songWidth + 10;
                // 添加人聲標籤
                if (song.HumanVoice == 1)
                {
                    PictureBox icon = new PictureBox()
                    {
                        Image = Image.FromFile(Path.Combine(Application.StartupPath, @"themes\superstar\其他符號_人聲\其他符號_人聲.png")),
                        SizeMode = PictureBoxSizeMode.Zoom,
                        Size = new Size(32, 32),
                        Location = new Point(songX + 5, y + 8)
                    };
                    this.Controls.Add(icon);
                    icon.BringToFront();
                    
                    // 有圖標時歌名右移
                    songLabel.Location = new Point(songX + 42, y);
                    songLabel.Size = new Size(songWidth - 47, ItemHeight - 20);
                }
                else
                {
                    // 沒有圖標時歌名置中
                    songLabel.Location = new Point(songX, y);
                    songLabel.Size = new Size(songWidth - 10, ItemHeight - 20);
                }
                // 歌手標籤位置調整
                artistLabel.Location = new Point(artistX, y + 33);
                artistLabel.Size = new Size(artistWidth - 10, ItemHeight - 35);
                // 創建分隔線面板
                Panel separatorPanel = new Panel
                {
                    Location = new Point(songX - 5, y + ItemHeight - 2),
                    Size = new Size(songWidth + artistWidth + 20, 2),
                    BackColor = Color.FromArgb(80, 255, 255, 255),
                    Name = "SeparatorPanel_" + index.ToString()
                };

                // 根據文字長度設置字體大小
                if (artistText.Length > 6)
                {
                    artistLabel.Font =  new Font("微軟正黑體", 10, FontStyle.Bold);
                }
                else if (artistText.Length  > 3)
                {
                    artistLabel.Font =  new Font("微軟正黑體", 12, FontStyle.Bold);
                }
                else
                {
                    artistLabel.Font =  new Font("微軟正黑體", 14, FontStyle.Bold);
                }

                //artistLabel.Font = new Font("微軟正黑體", 16, FontStyle.Bold);

                artistLabel.ForeColor = Color.FromArgb(30,144,255);
                songLabel.TextAlign = ContentAlignment.MiddleLeft;
                artistLabel.TextAlign = ContentAlignment.MiddleRight;
                // 確保背景透明
                songLabel.BackColor = Color.Transparent;
                artistLabel.BackColor = Color.Transparent;
                // 定義滑鼠進入 (MouseEnter) 事件的處理程序
                EventHandler mouseEnter = (sender, e) => {
                    // 當不在「已點歌曲」頁面，或者該歌曲不是當前正在播放的歌曲，
                    // 且（該歌曲未播放過或不是該歌曲的最新實例）時，改變顯示樣式
                    if (!PrimaryForm.Instance.isOnOrderedSongsPage || 
                        (!isCurrentlyPlaying && (!hasBeenPlayed || !isLatestInstance)))
                    {
                        // 當滑鼠移到歌曲上時，變更歌曲名稱為黃色
                        songLabel.ForeColor = Color.Yellow;
                        // 變更歌手名稱為黃色
                        artistLabel.ForeColor = Color.Yellow;
                        // 增強分隔線的亮度，使其更明顯
                        separatorPanel.BackColor = Color.FromArgb(120, 255, 255, 255);
                    }
                };
                // 定義滑鼠離開 (MouseLeave) 事件的處理程序
                EventHandler mouseLeave = (sender, e) => {
                    // 判斷是否處於「已點歌曲」頁面
                    if (PrimaryForm.Instance.isOnOrderedSongsPage)
                    {
                        // 如果當前歌曲正在播放，則維持綠色顯示
                        if (isCurrentlyPlaying)
                        {
                            songLabel.ForeColor = Color.LimeGreen;
                        }
                        // 如果該歌曲已播放完成，且是該歌曲的最新實例，則變為灰色
                        else if (hasBeenPlayed && isLatestInstance)
                        {
                            songLabel.ForeColor = Color.Gray;
                        }
                        // 其他情況，則維持白色
                        else 
                        {
                            songLabel.ForeColor = Color.White;
                        }
                    }
                    else
                    {
                        // 若不在「已點歌曲」頁面，則默認為白色
                        songLabel.ForeColor = Color.White;
                    }
                    // 恢復歌手名稱的顏色為預設的藍色
                    artistLabel.ForeColor = Color.FromArgb(30, 144, 255);
                    // 恢復分隔線的顏色為半透明白色
                    separatorPanel.BackColor = Color.FromArgb(80, 255, 255, 255);
                };
                // 添加事件处理
                songLabel.Click += PrimaryForm.Instance.Label_Click;
                artistLabel.Click += PrimaryForm.Instance.Label_Click;
                // 滑動事件調整位置
                songLabel.MouseDown += MultiPagePanel_MouseDown;
                songLabel.MouseMove += MultiPagePanel_MouseMove;
                songLabel.MouseUp += MultiPagePanel_MouseUp;
                songLabel.MouseEnter += mouseEnter;
                songLabel.MouseLeave += mouseLeave;
                artistLabel.MouseEnter += mouseEnter;
                artistLabel.MouseLeave += mouseLeave;
                // 滑動事件調整位置
                artistLabel.MouseDown += MultiPagePanel_MouseDown;
                artistLabel.MouseMove += MultiPagePanel_MouseMove;
                artistLabel.MouseUp += MultiPagePanel_MouseUp;
                separatorPanel.MouseEnter += mouseEnter;
                separatorPanel.MouseLeave += mouseLeave;
                // 按正确顺序添加控件
                this.Controls.Add(separatorPanel);
                this.Controls.Add(songLabel);
                this.Controls.Add(artistLabel);
                // 确保控件层次正确
                songLabel.BringToFront();
                artistLabel.BringToFront();
            }
        
    
        }
    }
}