using System;
using System.Collections.ObjectModel;
using System.ComponentModel;
using System.Diagnostics;
using System.IO;
using System.Threading.Tasks;
using System.Windows.Input;
using System.Windows.Threading;

namespace NavisworksTransport.UI.WPF.ViewModels
{
    /// <summary>
    /// 系统管理ViewModel - 参照PathEditingViewModel的设计模式
    /// 专门负责系统管理相关功能，包括：日志管理、设置管理、性能监控、版本控制、配置管理等
    /// </summary>
    public class SystemManagementViewModel : ViewModelBase
    {
        #region 私有字段

        // 依赖注入的核心服务
        private readonly UIStateManager _uiStateManager;
        
        // 系统管理相关的管理器实例（通过依赖注入）
        private ISystemLogManager _logManager;
        private ISystemConfigManager _configManager; 
        private IPerformanceMonitor _performanceMonitor;
        private IModelSplitterManager _modelSplitterManager;

        // 日志管理相关字段
        private ObservableCollection<string> _logLevels;
        private string _selectedLogLevel = "Info";
        private string _logStatus = "日志系统正常";
        private int _logEntryCount = 0;
        private string _logFilePath = "未设置";

        // 系统设置相关字段
        private bool _isAutoSaveEnabled = true;
        private bool _isDebugModeEnabled = false;
        private string _settingsStatus = "设置已加载";
        private int _autoSaveInterval = 300; // 秒
        private string _workingDirectory = "";

        // 版本和系统信息相关字段
        private string _pluginVersion = "v1.0";
        private string _navisworksVersion = "2026";
        private string _systemStatus = "正常";
        private string _systemStatusColor = "Green";
        private string _lastUpdateCheck = "未检查";

        // 性能监控相关字段
        private string _memoryUsage = "0 MB";
        private string _runningTime = "00:00:00";
        private string _performanceInfo = "性能监控就绪";
        private double _cpuUsage = 0.0;
        private int _threadsCount = 0;
        private DispatcherTimer _performanceTimer;

        // 模型分割器相关字段
        private string _modelSplitterStatus = "就绪";
        private bool _canRunModelSplitter = true;
        private string _lastSplitResult = "未执行";

        // 配置管理相关字段
        private string _currentConfigProfile = "默认配置";
        private ObservableCollection<string> _availableProfiles;
        private bool _hasUnsavedChanges = false;

        #endregion

        #region 公共属性

        #region 日志管理属性

        /// <summary>
        /// 可用日志级别集合
        /// </summary>
        public ObservableCollection<string> LogLevels
        {
            get => _logLevels;
            set => SetProperty(ref _logLevels, value);
        }

        /// <summary>
        /// 选中的日志级别
        /// </summary>
        public string SelectedLogLevel
        {
            get => _selectedLogLevel;
            set 
            { 
                if (SetProperty(ref _selectedLogLevel, value))
                {
                    OnLogLevelChanged();
                }
            }
        }

        /// <summary>
        /// 日志系统状态
        /// </summary>
        public string LogStatus
        {
            get => _logStatus;
            set => SetProperty(ref _logStatus, value);
        }

        /// <summary>
        /// 日志条目数量
        /// </summary>
        public int LogEntryCount
        {
            get => _logEntryCount;
            set => SetProperty(ref _logEntryCount, value);
        }

        /// <summary>
        /// 日志文件路径
        /// </summary>
        public string LogFilePath
        {
            get => _logFilePath;
            set => SetProperty(ref _logFilePath, value);
        }

        #endregion

        #region 系统设置属性

        /// <summary>
        /// 是否启用自动保存
        /// </summary>
        public bool IsAutoSaveEnabled
        {
            get => _isAutoSaveEnabled;
            set 
            { 
                if (SetProperty(ref _isAutoSaveEnabled, value))
                {
                    OnAutoSaveSettingChanged();
                }
            }
        }

        /// <summary>
        /// 是否启用调试模式
        /// </summary>
        public bool IsDebugModeEnabled
        {
            get => _isDebugModeEnabled;
            set 
            { 
                if (SetProperty(ref _isDebugModeEnabled, value))
                {
                    OnDebugModeChanged();
                }
            }
        }

        /// <summary>
        /// 设置状态
        /// </summary>
        public string SettingsStatus
        {
            get => _settingsStatus;
            set => SetProperty(ref _settingsStatus, value);
        }

        /// <summary>
        /// 自动保存间隔（秒）
        /// </summary>
        public int AutoSaveInterval
        {
            get => _autoSaveInterval;
            set 
            { 
                if (SetProperty(ref _autoSaveInterval, value))
                {
                    OnAutoSaveIntervalChanged();
                }
            }
        }

        /// <summary>
        /// 工作目录
        /// </summary>
        public string WorkingDirectory
        {
            get => _workingDirectory;
            set => SetProperty(ref _workingDirectory, value);
        }

        #endregion

        #region 版本和系统信息属性

        /// <summary>
        /// 插件版本
        /// </summary>
        public string PluginVersion
        {
            get => _pluginVersion;
            set => SetProperty(ref _pluginVersion, value);
        }

        /// <summary>
        /// Navisworks版本
        /// </summary>
        public string NavisworksVersion
        {
            get => _navisworksVersion;
            set => SetProperty(ref _navisworksVersion, value);
        }

        /// <summary>
        /// 系统状态
        /// </summary>
        public string SystemStatus
        {
            get => _systemStatus;
            set => SetProperty(ref _systemStatus, value);
        }

        /// <summary>
        /// 系统状态颜色
        /// </summary>
        public string SystemStatusColor
        {
            get => _systemStatusColor;
            set => SetProperty(ref _systemStatusColor, value);
        }

        /// <summary>
        /// 最后更新检查时间
        /// </summary>
        public string LastUpdateCheck
        {
            get => _lastUpdateCheck;
            set => SetProperty(ref _lastUpdateCheck, value);
        }

        #endregion

        #region 性能监控属性

        /// <summary>
        /// 内存使用情况
        /// </summary>
        public string MemoryUsage
        {
            get => _memoryUsage;
            set => SetProperty(ref _memoryUsage, value);
        }

        /// <summary>
        /// 运行时间
        /// </summary>
        public string RunningTime
        {
            get => _runningTime;
            set => SetProperty(ref _runningTime, value);
        }

        /// <summary>
        /// 性能信息
        /// </summary>
        public string PerformanceInfo
        {
            get => _performanceInfo;
            set => SetProperty(ref _performanceInfo, value);
        }

        /// <summary>
        /// CPU使用率
        /// </summary>
        public double CpuUsage
        {
            get => _cpuUsage;
            set => SetProperty(ref _cpuUsage, value);
        }

        /// <summary>
        /// 线程数量
        /// </summary>
        public int ThreadsCount
        {
            get => _threadsCount;
            set => SetProperty(ref _threadsCount, value);
        }

        #endregion

        #region 模型分割器属性

        /// <summary>
        /// 模型分层拆分状态
        /// </summary>
        public string ModelSplitterStatus
        {
            get => _modelSplitterStatus;
            set => SetProperty(ref _modelSplitterStatus, value);
        }

        /// <summary>
        /// 是否可以运行模型分割器
        /// </summary>
        public bool CanRunModelSplitter
        {
            get => _canRunModelSplitter;
            set => SetProperty(ref _canRunModelSplitter, value);
        }

        /// <summary>
        /// 最后分割结果
        /// </summary>
        public string LastSplitResult
        {
            get => _lastSplitResult;
            set => SetProperty(ref _lastSplitResult, value);
        }

        #endregion

        #region 配置管理属性

        /// <summary>
        /// 当前配置档案
        /// </summary>
        public string CurrentConfigProfile
        {
            get => _currentConfigProfile;
            set => SetProperty(ref _currentConfigProfile, value);
        }

        /// <summary>
        /// 可用配置档案
        /// </summary>
        public ObservableCollection<string> AvailableProfiles
        {
            get => _availableProfiles;
            set => SetProperty(ref _availableProfiles, value);
        }

        /// <summary>
        /// 是否有未保存的更改
        /// </summary>
        public bool HasUnsavedChanges
        {
            get => _hasUnsavedChanges;
            set => SetProperty(ref _hasUnsavedChanges, value);
        }

        #endregion

        #endregion

        #region 命令定义

        // 日志管理命令
        public ICommand ViewLogCommand { get; private set; }
        public ICommand ClearLogCommand { get; private set; }
        public ICommand ExportLogCommand { get; private set; }
        public ICommand RefreshLogStatusCommand { get; private set; }

        // 设置管理命令
        public ICommand OpenSettingsCommand { get; private set; }
        public ICommand ResetSettingsCommand { get; private set; }
        public ICommand SaveSettingsCommand { get; private set; }
        public ICommand LoadSettingsCommand { get; private set; }

        // 配置管理命令
        public ICommand ImportConfigCommand { get; private set; }
        public ICommand ExportConfigCommand { get; private set; }
        public ICommand CreateProfileCommand { get; private set; }
        public ICommand DeleteProfileCommand { get; private set; }
        public ICommand SwitchProfileCommand { get; private set; }

        // 系统管理命令
        public ICommand CheckUpdateCommand { get; private set; }
        public ICommand RestartSystemCommand { get; private set; }
        public ICommand SystemDiagnosticsCommand { get; private set; }

        // 性能管理命令
        public ICommand GeneratePerformanceReportCommand { get; private set; }
        public ICommand StartPerformanceMonitoringCommand { get; private set; }
        public ICommand StopPerformanceMonitoringCommand { get; private set; }
        public ICommand ClearPerformanceDataCommand { get; private set; }

        // 模型分割器命令
        public ICommand RunModelSplitterCommand { get; private set; }
        public ICommand ConfigureModelSplitterCommand { get; private set; }

        #endregion

        #region 构造函数

        /// <summary>
        /// 构造函数 - 参照PathEditingViewModel的设计模式
        /// </summary>
        /// <param name="logManager">日志管理器（可选，用于依赖注入）</param>
        /// <param name="configManager">配置管理器（可选，用于依赖注入）</param>
        /// <param name="performanceMonitor">性能监控器（可选，用于依赖注入）</param>
        /// <param name="modelSplitterManager">模型分割器管理器（可选，用于依赖注入）</param>
        public SystemManagementViewModel(
            ISystemLogManager logManager = null,
            ISystemConfigManager configManager = null, 
            IPerformanceMonitor performanceMonitor = null,
            IModelSplitterManager modelSplitterManager = null) : base()
        {
            try
            {
                // 获取UI状态管理器
                _uiStateManager = UIStateManager.Instance;
                if (_uiStateManager == null)
                {
                    throw new InvalidOperationException("UIStateManager初始化失败");
                }

                // 设置依赖（如果为null则使用默认实现）
                _logManager = logManager ?? CreateDefaultLogManager();
                _configManager = configManager ?? CreateDefaultConfigManager();
                _performanceMonitor = performanceMonitor ?? CreateDefaultPerformanceMonitor();
                _modelSplitterManager = modelSplitterManager ?? CreateDefaultModelSplitterManager();

                // 初始化集合
                LogLevels = new ThreadSafeObservableCollection<string>();
                AvailableProfiles = new ThreadSafeObservableCollection<string>();
                
                // 初始化命令
                InitializeCommands();
                
                // 初始化系统管理设置（异步）
                InitializeSystemManagementAsync();
                
                LogManager.Info("SystemManagementViewModel构造函数执行完成");
            }
            catch (Exception ex)
            {
                LogManager.Error($"SystemManagementViewModel构造函数异常: {ex.Message}", ex);
                SystemStatus = "初始化失败，请检查日志";
                SystemStatusColor = "Red";
                throw;
            }
        }

        #endregion

        #region 初始化方法

        /// <summary>
        /// 初始化命令
        /// </summary>
        private void InitializeCommands()
        {
            // 日志管理命令
            ViewLogCommand = new RelayCommand(async () => await ExecuteViewLogAsync());
            ClearLogCommand = new RelayCommand(async () => await ExecuteClearLogAsync());
            ExportLogCommand = new RelayCommand(async () => await ExecuteExportLogAsync());
            RefreshLogStatusCommand = new RelayCommand(async () => await ExecuteRefreshLogStatusAsync());

            // 设置管理命令
            OpenSettingsCommand = new RelayCommand(async () => await ExecuteOpenSettingsAsync());
            ResetSettingsCommand = new RelayCommand(async () => await ExecuteResetSettingsAsync());
            SaveSettingsCommand = new RelayCommand(async () => await ExecuteSaveSettingsAsync());
            LoadSettingsCommand = new RelayCommand(async () => await ExecuteLoadSettingsAsync());

            // 配置管理命令
            ImportConfigCommand = new RelayCommand(async () => await ExecuteImportConfigAsync());
            ExportConfigCommand = new RelayCommand(async () => await ExecuteExportConfigAsync());
            CreateProfileCommand = new RelayCommand(async () => await ExecuteCreateProfileAsync());
            DeleteProfileCommand = new RelayCommand(async () => await ExecuteDeleteProfileAsync());
            SwitchProfileCommand = new RelayCommand<string>(async (profile) => await ExecuteSwitchProfileAsync(profile));

            // 系统管理命令
            CheckUpdateCommand = new RelayCommand(async () => await ExecuteCheckUpdateAsync());
            RestartSystemCommand = new RelayCommand(async () => await ExecuteRestartSystemAsync());
            SystemDiagnosticsCommand = new RelayCommand(async () => await ExecuteSystemDiagnosticsAsync());

            // 性能管理命令
            GeneratePerformanceReportCommand = new RelayCommand(async () => await ExecuteGeneratePerformanceReportAsync());
            StartPerformanceMonitoringCommand = new RelayCommand(async () => await ExecuteStartPerformanceMonitoringAsync());
            StopPerformanceMonitoringCommand = new RelayCommand(async () => await ExecuteStopPerformanceMonitoringAsync());
            ClearPerformanceDataCommand = new RelayCommand(async () => await ExecuteClearPerformanceDataAsync());

            // 模型分割器命令
            RunModelSplitterCommand = new RelayCommand(async () => await ExecuteRunModelSplitterAsync(), () => CanRunModelSplitter);
            ConfigureModelSplitterCommand = new RelayCommand(async () => await ExecuteConfigureModelSplitterAsync());
        }

        /// <summary>
        /// 异步初始化系统管理设置
        /// </summary>
        private async void InitializeSystemManagementAsync()
        {
            await SafeExecuteAsync(async () =>
            {
                await _uiStateManager.ExecuteUIUpdateAsync(() =>
                {
                    // 初始化日志级别
                    LogLevels.Clear();
                    var logLevels = new[] { "Debug", "Info", "Warning", "Error" };
                    foreach (var level in logLevels)
                    {
                        LogLevels.Add(level);
                    }
                    SelectedLogLevel = "Info";
                    
                    // 初始化配置档案
                    AvailableProfiles.Clear();
                    var profiles = new[] { "默认配置", "开发配置", "生产配置", "测试配置" };
                    foreach (var profile in profiles)
                    {
                        AvailableProfiles.Add(profile);
                    }
                    CurrentConfigProfile = "默认配置";
                    
                    // 初始化系统信息
                    PluginVersion = GetPluginVersion();
                    NavisworksVersion = GetNavisworksVersion();
                    SystemStatus = "正常";
                    SystemStatusColor = "Green";
                    WorkingDirectory = GetWorkingDirectory();
                    LogFilePath = GetLogFilePath();
                });
                
                // 启动性能监控
                await StartPerformanceMonitoring();
                
                LogManager.Info("系统管理设置初始化完成");
            }, "初始化系统管理设置");
        }

        #endregion

        #region 命令实现

        // 这里只展示架构框架，具体实现方法将在后续详细说明
        
        #region 日志管理命令实现

        private async Task ExecuteViewLogAsync()
        {
            await SafeExecuteAsync(async () =>
            {
                // TODO: 实现日志查看功能
                await _logManager.OpenLogViewerAsync();
                LogStatus = "日志查看器已打开";
            }, "查看日志");
        }

        private async Task ExecuteClearLogAsync()
        {
            await SafeExecuteAsync(async () =>
            {
                // TODO: 实现日志清空功能
                await _logManager.ClearLogsAsync();
                LogEntryCount = 0;
                LogStatus = "日志已清空";
            }, "清空日志");
        }

        private async Task ExecuteExportLogAsync()
        {
            await SafeExecuteAsync(async () =>
            {
                // TODO: 实现日志导出功能
                var exportPath = await _logManager.ExportLogsAsync();
                LogStatus = $"日志已导出到: {exportPath}";
            }, "导出日志");
        }

        private async Task ExecuteRefreshLogStatusAsync()
        {
            await SafeExecuteAsync(async () =>
            {
                // TODO: 实现日志状态刷新功能
                var status = await _logManager.GetLogStatusAsync();
                LogStatus = status.Message;
                LogEntryCount = status.EntryCount;
                LogFilePath = status.FilePath;
            }, "刷新日志状态");
        }

        #endregion

        // 其他命令实现方法...
        // (这里省略具体实现，在实际代码中会完整实现)

        #endregion

        #region 事件处理

        /// <summary>
        /// 处理日志级别改变事件
        /// </summary>
        private void OnLogLevelChanged()
        {
            SafeExecute(() =>
            {
                _logManager?.SetLogLevel(SelectedLogLevel);
                LogStatus = $"日志级别已设置为: {SelectedLogLevel}";
            }, "设置日志级别");
        }

        /// <summary>
        /// 处理自动保存设置改变事件
        /// </summary>
        private void OnAutoSaveSettingChanged()
        {
            SafeExecute(() =>
            {
                _configManager?.SetAutoSaveEnabled(IsAutoSaveEnabled);
                SettingsStatus = $"自动保存: {(IsAutoSaveEnabled ? "已启用" : "已禁用")}";
                HasUnsavedChanges = true;
            }, "设置自动保存");
        }

        /// <summary>
        /// 处理调试模式改变事件
        /// </summary>
        private void OnDebugModeChanged()
        {
            SafeExecute(() =>
            {
                _configManager?.SetDebugMode(IsDebugModeEnabled);
                SettingsStatus = $"调试模式: {(IsDebugModeEnabled ? "已启用" : "已禁用")}";
                HasUnsavedChanges = true;
            }, "设置调试模式");
        }

        /// <summary>
        /// 处理自动保存间隔改变事件
        /// </summary>
        private void OnAutoSaveIntervalChanged()
        {
            SafeExecute(() =>
            {
                _configManager?.SetAutoSaveInterval(AutoSaveInterval);
                SettingsStatus = $"自动保存间隔: {AutoSaveInterval}秒";
                HasUnsavedChanges = true;
            }, "设置自动保存间隔");
        }

        #endregion

        #region 辅助方法

        /// <summary>
        /// 安全执行异步操作
        /// </summary>
        private async Task SafeExecuteAsync(Func<Task> action, string operationName = "未知操作")
        {
            try
            {
                await action();
            }
            catch (Exception ex)
            {
                LogManager.Error($"{operationName}发生异常: {ex.Message}", ex);
                SystemStatus = $"{operationName}失败: {ex.Message}";
                SystemStatusColor = "Red";
            }
        }

        /// <summary>
        /// 安全执行同步操作
        /// </summary>
        private void SafeExecute(Action action, string operationName = "未知操作")
        {
            try
            {
                action();
            }
            catch (Exception ex)
            {
                LogManager.Error($"{operationName}发生异常: {ex.Message}", ex);
                SystemStatus = $"{operationName}失败: {ex.Message}";
                SystemStatusColor = "Red";
            }
        }

        #endregion

        #region 性能监控

        /// <summary>
        /// 启动性能监控
        /// </summary>
        private async Task StartPerformanceMonitoring()
        {
            await SafeExecuteAsync(async () =>
            {
                var startTime = DateTime.Now;
                
                // 使用定时器更新性能信息
                _performanceTimer = new DispatcherTimer();
                _performanceTimer.Interval = TimeSpan.FromSeconds(5);
                _performanceTimer.Tick += async (s, e) =>
                {
                    try
                    {
                        await UpdatePerformanceInfo(startTime);
                    }
                    catch (Exception ex)
                    {
                        LogManager.Error($"性能监控更新失败: {ex.Message}");
                    }
                };
                _performanceTimer.Start();
                
                PerformanceInfo = "性能监控已启动";
            }, "启动性能监控");
        }

        /// <summary>
        /// 更新性能信息
        /// </summary>
        private async Task UpdatePerformanceInfo(DateTime startTime)
        {
            await _uiStateManager.ExecuteUIUpdateAsync(() =>
            {
                // 更新内存使用
                var process = Process.GetCurrentProcess();
                var memoryMB = process.WorkingSet64 / (1024 * 1024);
                MemoryUsage = $"{memoryMB} MB";
                
                // 更新运行时间
                var runTime = DateTime.Now - startTime;
                RunningTime = $"{runTime.Hours:D2}:{runTime.Minutes:D2}:{runTime.Seconds:D2}";
                
                // 更新线程数
                ThreadsCount = process.Threads.Count;
                
                // 更新性能信息
                PerformanceInfo = $"CPU: 正常, 内存: {memoryMB}MB, 线程: {ThreadsCount}, 运行时间: {RunningTime}";
            });
        }

        #endregion

        #region 默认实现创建方法

        private ISystemLogManager CreateDefaultLogManager()
        {
            // TODO: 创建默认日志管理器实现
            return new DefaultSystemLogManager();
        }

        private ISystemConfigManager CreateDefaultConfigManager()
        {
            // TODO: 创建默认配置管理器实现
            return new DefaultSystemConfigManager();
        }

        private IPerformanceMonitor CreateDefaultPerformanceMonitor()
        {
            // TODO: 创建默认性能监控器实现
            return new DefaultPerformanceMonitor();
        }

        private IModelSplitterManager CreateDefaultModelSplitterManager()
        {
            // TODO: 创建默认模型分割器管理器实现
            return new DefaultModelSplitterManager();
        }

        #endregion

        #region 系统信息获取方法

        private string GetPluginVersion()
        {
            // TODO: 从程序集获取插件版本
            return "v1.0";
        }

        private string GetNavisworksVersion()
        {
            // TODO: 从Navisworks API获取版本信息
            return "2026";
        }

        private string GetWorkingDirectory()
        {
            // TODO: 获取当前工作目录
            return Environment.CurrentDirectory;
        }

        private string GetLogFilePath()
        {
            // TODO: 获取日志文件路径
            return Path.Combine(GetWorkingDirectory(), "Logs", "NavisworksTransport.log");
        }

        #endregion

        #region 资源清理

        /// <summary>
        /// 清理资源
        /// </summary>
        public void Cleanup()
        {
            try
            {
                LogManager.Info("开始清理SystemManagementViewModel资源");
                
                // 停止性能监控定时器
                if (_performanceTimer != null)
                {
                    _performanceTimer.Stop();
                    _performanceTimer = null;
                }
                
                // 清理管理器资源
                _logManager?.Dispose();
                _configManager?.Dispose();
                _performanceMonitor?.Dispose();
                _modelSplitterManager?.Dispose();
                
                LogManager.Info("SystemManagementViewModel资源清理完成");
            }
            catch (Exception ex)
            {
                LogManager.Error($"SystemManagementViewModel清理失败: {ex.Message}");
            }
        }

        #endregion
    }
}

// 接口定义（这些接口将在单独的文件中定义）

/// <summary>
/// 系统日志管理器接口
/// </summary>
public interface ISystemLogManager : IDisposable
{
    Task OpenLogViewerAsync();
    Task ClearLogsAsync();
    Task<string> ExportLogsAsync();
    Task<LogStatus> GetLogStatusAsync();
    void SetLogLevel(string level);
}

/// <summary>
/// 系统配置管理器接口
/// </summary>
public interface ISystemConfigManager : IDisposable
{
    void SetAutoSaveEnabled(bool enabled);
    void SetDebugMode(bool enabled);
    void SetAutoSaveInterval(int seconds);
    Task SaveConfigAsync();
    Task LoadConfigAsync();
}

/// <summary>
/// 性能监控器接口
/// </summary>
public interface IPerformanceMonitor : IDisposable
{
    Task<PerformanceData> GetCurrentPerformanceAsync();
    Task StartMonitoringAsync();
    Task StopMonitoringAsync();
}

/// <summary>
/// 模型分割器管理器接口
/// </summary>
public interface IModelSplitterManager : IDisposable
{
    Task<bool> RunModelSplitterAsync();
    Task ConfigureAsync();
    bool CanRun { get; }
}

/// <summary>
/// 日志状态数据结构
/// </summary>
public class LogStatus
{
    public string Message { get; set; }
    public int EntryCount { get; set; }
    public string FilePath { get; set; }
}

/// <summary>
/// 性能数据结构
/// </summary>
public class PerformanceData
{
    public double CpuUsage { get; set; }
    public long MemoryUsage { get; set; }
    public int ThreadCount { get; set; }
    public TimeSpan RunningTime { get; set; }
}