using System;
using System.Collections.Generic;
using System.Windows.Input;
using System.IO;
using Newtonsoft.Json;
using NHotkey.Wpf;

namespace Ink_Canvas.Helpers
{
    /// <summary>
    /// 全局快捷键管理器 - 使用NHotkey库实现全局快捷键功能
    /// </summary>
    public class GlobalHotkeyManager : IDisposable
    {
        #region Private Fields
        private readonly Dictionary<string, HotkeyInfo> _registeredHotkeys;
        private readonly MainWindow _mainWindow;
        private bool _isDisposed = false;
        
        // 配置文件路径
        private static readonly string HotkeyConfigFile = Path.Combine(App.RootPath, "HotkeyConfig.json");
        private static readonly string HotkeyConfigBackupFile = Path.Combine(App.RootPath, "HotkeyConfig.json.bak");
        #endregion

        #region Constructor
        public GlobalHotkeyManager(MainWindow mainWindow)
        {
            _mainWindow = mainWindow ?? throw new ArgumentNullException(nameof(mainWindow));
            _registeredHotkeys = new Dictionary<string, HotkeyInfo>();
        }
        #endregion

        #region Public Methods
        /// <summary>
        /// 注册全局快捷键
        /// </summary>
        /// <param name="hotkeyName">快捷键名称</param>
        /// <param name="key">按键</param>
        /// <param name="modifiers">修饰键</param>
        /// <param name="action">执行动作</param>
        /// <returns>是否注册成功</returns>
        public bool RegisterHotkey(string hotkeyName, Key key, ModifierKeys modifiers, Action action)
        {
            try
            {
                if (_isDisposed)
                    return false;

                // 如果快捷键已存在，先注销
                if (_registeredHotkeys.ContainsKey(hotkeyName))
                {
                    UnregisterHotkey(hotkeyName);
                }

                // 创建快捷键信息
                var hotkeyInfo = new HotkeyInfo
                {
                    Name = hotkeyName,
                    Key = key,
                    Modifiers = modifiers,
                    Action = action
                };

                // 注册快捷键
                HotkeyManager.Current.AddOrReplace(hotkeyName, key, modifiers, (sender, e) =>
                {
                    try
                    {
                        // 确保在主线程中执行
                        _mainWindow.Dispatcher.Invoke(() =>
                        {
                            action?.Invoke();
                        });
                    }
                    catch (Exception ex)
                    {
                        LogHelper.WriteLogToFile($"执行快捷键 {hotkeyName} 时出错: {ex.Message}", LogHelper.LogType.Error);
                    }
                });

                _registeredHotkeys[hotkeyName] = hotkeyInfo;
                LogHelper.WriteLogToFile($"成功注册全局快捷键: {hotkeyName} ({modifiers}+{key})", LogHelper.LogType.Event);
                return true;
            }
            catch (Exception ex)
            {
                LogHelper.WriteLogToFile($"注册全局快捷键 {hotkeyName} 失败: {ex.Message}", LogHelper.LogType.Error);
                return false;
            }
        }

        /// <summary>
        /// 注销指定快捷键
        /// </summary>
        /// <param name="hotkeyName">快捷键名称</param>
        /// <returns>是否注销成功</returns>
        public bool UnregisterHotkey(string hotkeyName)
        {
            try
            {
                if (_isDisposed || !_registeredHotkeys.ContainsKey(hotkeyName))
                    return false;

                HotkeyManager.Current.Remove(hotkeyName);
                _registeredHotkeys.Remove(hotkeyName);
                LogHelper.WriteLogToFile($"成功注销全局快捷键: {hotkeyName}", LogHelper.LogType.Event);
                return true;
            }
            catch (Exception ex)
            {
                LogHelper.WriteLogToFile($"注销全局快捷键 {hotkeyName} 失败: {ex.Message}", LogHelper.LogType.Error);
                return false;
            }
        }

        /// <summary>
        /// 注销所有快捷键
        /// </summary>
        public void UnregisterAllHotkeys()
        {
            try
            {
                if (_isDisposed)
                    return;

                foreach (var hotkeyName in _registeredHotkeys.Keys)
                {
                    try
                    {
                        HotkeyManager.Current.Remove(hotkeyName);
                    }
                    catch (Exception ex)
                    {
                        LogHelper.WriteLogToFile($"注销快捷键 {hotkeyName} 时出错: {ex.Message}", LogHelper.LogType.Warning);
                    }
                }

                _registeredHotkeys.Clear();
                LogHelper.WriteLogToFile("已注销所有全局快捷键", LogHelper.LogType.Event);
            }
            catch (Exception ex)
            {
                LogHelper.WriteLogToFile($"注销所有快捷键时出错: {ex.Message}", LogHelper.LogType.Error);
            }
        }

        /// <summary>
        /// 检查快捷键是否已注册
        /// </summary>
        /// <param name="hotkeyName">快捷键名称</param>
        /// <returns>是否已注册</returns>
        public bool IsHotkeyRegistered(string hotkeyName)
        {
            return _registeredHotkeys.ContainsKey(hotkeyName);
        }

        /// <summary>
        /// 获取已注册的快捷键列表
        /// </summary>
        /// <returns>快捷键信息列表</returns>
        public List<HotkeyInfo> GetRegisteredHotkeys()
        {
            return new List<HotkeyInfo>(_registeredHotkeys.Values);
        }

        /// <summary>
        /// 注册默认快捷键集合
        /// </summary>
        public void RegisterDefaultHotkeys()
        {
            try
            {
                // 基本操作快捷键
                RegisterHotkey("Undo", Key.Z, ModifierKeys.Control, () => _mainWindow.SymbolIconUndo_MouseUp(null, null));
                RegisterHotkey("Redo", Key.Y, ModifierKeys.Control, () => _mainWindow.SymbolIconRedo_MouseUp(null, null));
                RegisterHotkey("Clear", Key.E, ModifierKeys.Control, () => _mainWindow.SymbolIconDelete_MouseUp(null, null));
                RegisterHotkey("Paste", Key.V, ModifierKeys.Control, () => _mainWindow.HandleGlobalPaste(null, null));

                // 工具切换快捷键
                RegisterHotkey("SelectTool", Key.S, ModifierKeys.Alt, () => _mainWindow.SymbolIconSelect_MouseUp(null, null));
                RegisterHotkey("DrawTool", Key.D, ModifierKeys.Alt, () => _mainWindow.PenIcon_Click(null, null));
                RegisterHotkey("EraserTool", Key.E, ModifierKeys.Alt, () => _mainWindow.EraserIcon_Click(null, null));
                RegisterHotkey("BlackboardTool", Key.B, ModifierKeys.Alt, () => _mainWindow.ImageBlackboard_MouseUp(null, null));
                RegisterHotkey("QuitDrawTool", Key.Q, ModifierKeys.Alt, () => _mainWindow.CursorIcon_Click(null, null));

                // 画笔快捷键 - 使用反射访问penType字段
                RegisterHotkey("Pen1", Key.D1, ModifierKeys.Alt, () => SwitchToPenType(0));
                RegisterHotkey("Pen2", Key.D2, ModifierKeys.Alt, () => SwitchToPenType(1));
                RegisterHotkey("Pen3", Key.D3, ModifierKeys.Alt, () => SwitchToPenType(2));
                RegisterHotkey("Pen4", Key.D4, ModifierKeys.Alt, () => SwitchToPenType(3));
                RegisterHotkey("Pen5", Key.D5, ModifierKeys.Alt, () => SwitchToPenType(4));

                // 功能快捷键
                RegisterHotkey("DrawLine", Key.L, ModifierKeys.Alt, () => _mainWindow.BtnDrawLine_Click(null, null));
                RegisterHotkey("Screenshot", Key.C, ModifierKeys.Alt, () => _mainWindow.SaveScreenShotToDesktop());
                RegisterHotkey("Hide", Key.V, ModifierKeys.Alt, () => _mainWindow.SymbolIconEmoji_MouseUp(null, null));

                // 退出快捷键
                RegisterHotkey("Exit", Key.Escape, ModifierKeys.None, () => _mainWindow.KeyExit(null, null));

                LogHelper.WriteLogToFile("已注册默认全局快捷键集合", LogHelper.LogType.Event);
            }
            catch (Exception ex)
            {
                LogHelper.WriteLogToFile($"注册默认快捷键时出错: {ex.Message}", LogHelper.LogType.Error);
            }
        }

        /// <summary>
        /// 从设置加载快捷键配置
        /// </summary>
        public void LoadHotkeysFromSettings()
        {
            try
            {
                LogHelper.WriteLogToFile("开始从配置文件加载快捷键设置", LogHelper.LogType.Event);
                
                // 先注销所有现有快捷键
                UnregisterAllHotkeys();
                
                // 尝试从配置文件加载
                if (LoadHotkeysFromConfigFile())
                {
                    LogHelper.WriteLogToFile("成功从配置文件加载快捷键设置", LogHelper.LogType.Event);
                }
                else
                {
                    // 如果配置文件不存在或加载失败，使用默认快捷键
                    LogHelper.WriteLogToFile("配置文件不存在或加载失败，使用默认快捷键", LogHelper.LogType.Warning);
                    RegisterDefaultHotkeys();
                }
            }
            catch (Exception ex)
            {
                LogHelper.WriteLogToFile($"从设置加载快捷键时出错: {ex.Message}", LogHelper.LogType.Error);
                // 出错时使用默认快捷键
                RegisterDefaultHotkeys();
            }
        }

        /// <summary>
        /// 保存快捷键配置到设置
        /// </summary>
        public void SaveHotkeysToSettings()
        {
            try
            {
                LogHelper.WriteLogToFile("开始保存快捷键配置到配置文件", LogHelper.LogType.Event);
                
                if (SaveHotkeysToConfigFile())
                {
                    LogHelper.WriteLogToFile("快捷键配置已成功保存到配置文件", LogHelper.LogType.Event);
                }
                else
                {
                    LogHelper.WriteLogToFile("保存快捷键配置失败", LogHelper.LogType.Error);
                }
            }
            catch (Exception ex)
            {
                LogHelper.WriteLogToFile($"保存快捷键配置时出错: {ex.Message}", LogHelper.LogType.Error);
            }
        }

        /// <summary>
        /// 更新快捷键配置
        /// </summary>
        /// <param name="hotkeyName">快捷键名称</param>
        /// <param name="key">新按键</param>
        /// <param name="modifiers">新修饰键</param>
        /// <returns>是否更新成功</returns>
        public bool UpdateHotkey(string hotkeyName, Key key, ModifierKeys modifiers)
        {
            try
            {
                if (!_registeredHotkeys.ContainsKey(hotkeyName))
                {
                    LogHelper.WriteLogToFile($"快捷键 {hotkeyName} 不存在，无法更新", LogHelper.LogType.Warning);
                    return false;
                }

                // 获取原有的动作
                var originalAction = _registeredHotkeys[hotkeyName].Action;
                
                // 注销原有快捷键
                UnregisterHotkey(hotkeyName);
                
                // 注册新的快捷键
                var success = RegisterHotkey(hotkeyName, key, modifiers, originalAction);
                
                if (success)
                {
                    LogHelper.WriteLogToFile($"成功更新快捷键 {hotkeyName}: {modifiers}+{key}", LogHelper.LogType.Event);
                    // 自动保存配置
                    SaveHotkeysToSettings();
                }
                
                return success;
            }
            catch (Exception ex)
            {
                LogHelper.WriteLogToFile($"更新快捷键 {hotkeyName} 时出错: {ex.Message}", LogHelper.LogType.Error);
                return false;
            }
        }
        #endregion

        #region Private Helper Methods
        /// <summary>
        /// 切换到指定笔类型
        /// </summary>
        /// <param name="penTypeIndex">笔类型索引</param>
        private void SwitchToPenType(int penTypeIndex)
        {
            try
            {
                // 通过反射访问主窗口的penType字段
                var penTypeField = _mainWindow.GetType().GetField("penType", 
                    System.Reflection.BindingFlags.NonPublic | System.Reflection.BindingFlags.Instance);
                
                if (penTypeField != null)
                {
                    penTypeField.SetValue(_mainWindow, penTypeIndex);
                    
                    // 调用CheckPenTypeUIState方法更新UI状态
                    var checkPenTypeMethod = _mainWindow.GetType().GetMethod("CheckPenTypeUIState", 
                        System.Reflection.BindingFlags.NonPublic | System.Reflection.BindingFlags.Instance);
                    
                    if (checkPenTypeMethod != null)
                    {
                        checkPenTypeMethod.Invoke(_mainWindow, null);
                    }
                }
            }
            catch (Exception ex)
            {
                LogHelper.WriteLogToFile($"切换到笔类型{penTypeIndex}时出错: {ex.Message}", LogHelper.LogType.Error);
            }
        }

        /// <summary>
        /// 从配置文件加载快捷键设置
        /// </summary>
        /// <returns>是否加载成功</returns>
        private bool LoadHotkeysFromConfigFile()
        {
            try
            {
                if (!File.Exists(HotkeyConfigFile))
                {
                    LogHelper.WriteLogToFile($"快捷键配置文件不存在: {HotkeyConfigFile}", LogHelper.LogType.Warning);
                    return false;
                }

                // 读取配置文件内容
                string jsonContent = File.ReadAllText(HotkeyConfigFile, System.Text.Encoding.UTF8);
                if (string.IsNullOrEmpty(jsonContent))
                {
                    LogHelper.WriteLogToFile("快捷键配置文件为空", LogHelper.LogType.Warning);
                    return false;
                }

                // 反序列化配置
                var config = JsonConvert.DeserializeObject<HotkeyConfig>(jsonContent);
                if (config?.Hotkeys == null || config.Hotkeys.Count == 0)
                {
                    LogHelper.WriteLogToFile("快捷键配置为空或格式错误", LogHelper.LogType.Warning);
                    return false;
                }

                // 注册配置中的快捷键
                int successCount = 0;
                foreach (var hotkeyConfig in config.Hotkeys)
                {
                    try
                    {
                        // 根据快捷键名称获取对应的动作
                        var action = GetActionByName(hotkeyConfig.Name);
                        if (action != null)
                        {
                            if (RegisterHotkey(hotkeyConfig.Name, hotkeyConfig.Key, hotkeyConfig.Modifiers, action))
                            {
                                successCount++;
                            }
                        }
                        else
                        {
                            LogHelper.WriteLogToFile($"未找到快捷键 {hotkeyConfig.Name} 对应的动作", LogHelper.LogType.Warning);
                        }
                    }
                    catch (Exception ex)
                    {
                        LogHelper.WriteLogToFile($"注册快捷键 {hotkeyConfig.Name} 时出错: {ex.Message}", LogHelper.LogType.Error);
                    }
                }

                LogHelper.WriteLogToFile($"成功加载 {successCount}/{config.Hotkeys.Count} 个快捷键配置", LogHelper.LogType.Event);
                return successCount > 0;
            }
            catch (Exception ex)
            {
                LogHelper.WriteLogToFile($"从配置文件加载快捷键时出错: {ex.Message}", LogHelper.LogType.Error);
                
                // 尝试从备份文件加载
                if (File.Exists(HotkeyConfigBackupFile))
                {
                    LogHelper.WriteLogToFile("尝试从备份文件加载快捷键配置", LogHelper.LogType.Warning);
                    try
                    {
                        string backupContent = File.ReadAllText(HotkeyConfigBackupFile, System.Text.Encoding.UTF8);
                        var backupConfig = JsonConvert.DeserializeObject<HotkeyConfig>(backupContent);
                        if (backupConfig?.Hotkeys != null && backupConfig.Hotkeys.Count > 0)
                        {
                            // 恢复备份文件
                            File.Copy(HotkeyConfigBackupFile, HotkeyConfigFile, true);
                            LogHelper.WriteLogToFile("已从备份文件恢复快捷键配置", LogHelper.LogType.Event);
                            return LoadHotkeysFromConfigFile();
                        }
                    }
                    catch (Exception backupEx)
                    {
                        LogHelper.WriteLogToFile($"从备份文件加载快捷键配置时出错: {backupEx.Message}", LogHelper.LogType.Error);
                    }
                }
                
                return false;
            }
        }

        /// <summary>
        /// 保存快捷键配置到配置文件
        /// </summary>
        /// <returns>是否保存成功</returns>
        private bool SaveHotkeysToConfigFile()
        {
            try
            {
                // 确保配置目录存在
                string configDir = Path.GetDirectoryName(HotkeyConfigFile);
                if (!Directory.Exists(configDir))
                {
                    Directory.CreateDirectory(configDir);
                }

                // 创建配置对象
                var config = new HotkeyConfig
                {
                    Version = "1.0",
                    LastModified = DateTime.Now,
                    Hotkeys = new List<HotkeyConfigItem>()
                };

                // 添加所有已注册的快捷键
                foreach (var hotkey in _registeredHotkeys.Values)
                {
                    config.Hotkeys.Add(new HotkeyConfigItem
                    {
                        Name = hotkey.Name,
                        Key = hotkey.Key,
                        Modifiers = hotkey.Modifiers
                    });
                }

                // 序列化为JSON
                var settings = new JsonSerializerSettings
                {
                    Formatting = Formatting.Indented
                };
                
                string jsonContent = JsonConvert.SerializeObject(config, settings);

                // 先写入临时文件，然后替换原文件（原子操作）
                string tempFile = HotkeyConfigFile + ".temp";
                File.WriteAllText(tempFile, jsonContent, System.Text.Encoding.UTF8);

                // 如果原文件存在，先备份
                if (File.Exists(HotkeyConfigFile))
                {
                    File.Copy(HotkeyConfigFile, HotkeyConfigBackupFile, true);
                }

                // 替换原文件
                File.Move(tempFile, HotkeyConfigFile);

                LogHelper.WriteLogToFile($"快捷键配置已保存到: {HotkeyConfigFile}", LogHelper.LogType.Event);
                return true;
            }
            catch (Exception ex)
            {
                LogHelper.WriteLogToFile($"保存快捷键配置到配置文件时出错: {ex.Message}", LogHelper.LogType.Error);
                return false;
            }
        }

        /// <summary>
        /// 根据快捷键名称获取对应的动作
        /// </summary>
        /// <param name="hotkeyName">快捷键名称</param>
        /// <returns>对应的动作，如果不存在则返回null</returns>
        private Action GetActionByName(string hotkeyName)
        {
            try
            {
                switch (hotkeyName)
                {
                    case "Undo":
                        return () => _mainWindow.SymbolIconUndo_MouseUp(null, null);
                    case "Redo":
                        return () => _mainWindow.SymbolIconRedo_MouseUp(null, null);
                    case "Clear":
                        return () => _mainWindow.SymbolIconDelete_MouseUp(null, null);
                    case "Paste":
                        return () => _mainWindow.HandleGlobalPaste(null, null);
                    case "SelectTool":
                        return () => _mainWindow.SymbolIconSelect_MouseUp(null, null);
                    case "DrawTool":
                        return () => _mainWindow.PenIcon_Click(null, null);
                    case "EraserTool":
                        return () => _mainWindow.EraserIcon_Click(null, null);
                    case "BlackboardTool":
                        return () => _mainWindow.ImageBlackboard_MouseUp(null, null);
                    case "QuitDrawTool":
                        return () => _mainWindow.CursorIcon_Click(null, null);
                    case "Pen1":
                        return () => SwitchToPenType(0);
                    case "Pen2":
                        return () => SwitchToPenType(1);
                    case "Pen3":
                        return () => SwitchToPenType(2);
                    case "Pen4":
                        return () => SwitchToPenType(3);
                    case "Pen5":
                        return () => SwitchToPenType(4);
                    case "DrawLine":
                        return () => _mainWindow.BtnDrawLine_Click(null, null);
                    case "Screenshot":
                        return () => _mainWindow.SaveScreenShotToDesktop();
                    case "Hide":
                        return () => _mainWindow.SymbolIconEmoji_MouseUp(null, null);
                    case "Exit":
                        return () => _mainWindow.KeyExit(null, null);
                    default:
                        LogHelper.WriteLogToFile($"未知的快捷键名称: {hotkeyName}", LogHelper.LogType.Warning);
                        return null;
                }
            }
            catch (Exception ex)
            {
                LogHelper.WriteLogToFile($"获取快捷键 {hotkeyName} 对应动作时出错: {ex.Message}", LogHelper.LogType.Error);
                return null;
            }
        }
        #endregion

        #region IDisposable Implementation
        public void Dispose()
        {
            if (!_isDisposed)
            {
                UnregisterAllHotkeys();
                _isDisposed = true;
            }
        }
        #endregion

        #region Nested Classes
        /// <summary>
        /// 快捷键信息类
        /// </summary>
        public class HotkeyInfo
        {
            public string Name { get; set; }
            public Key Key { get; set; }
            public ModifierKeys Modifiers { get; set; }
            public Action Action { get; set; }

            public override string ToString()
            {
                var modifiersText = Modifiers == ModifierKeys.None ? "" : $"{Modifiers}+";
                return $"{modifiersText}{Key}";
            }
        }

        /// <summary>
        /// 快捷键配置类
        /// </summary>
        private class HotkeyConfig
        {
            public string Version { get; set; }
            public DateTime LastModified { get; set; }
            public List<HotkeyConfigItem> Hotkeys { get; set; }
        }

        /// <summary>
        /// 快捷键配置项类
        /// </summary>
        private class HotkeyConfigItem
        {
            public string Name { get; set; }
            public Key Key { get; set; }
            public ModifierKeys Modifiers { get; set; }
        }
        #endregion
    }
}