/*
 * InstallPage.xaml.cs - Better-Seewo 安装向导安装页面逻辑
 * 负责模拟安装过程、更新进度条和日志、管理安装步骤状态
 * 作者：雾启工作室
 */

using System;
using System.IO;
using System.Threading.Tasks;
using System.Windows;
using System.Windows.Controls;
using System.Windows.Media.Animation;

namespace Better_Seewo.Installer.Pages
{
    /// <summary>
    /// InstallPage 的交互逻辑 - 安装向导安装页面
    /// </summary>
    public partial class InstallPage : Page
    {
        /// <summary>
        /// 当前安装进度（0-100）
        /// </summary>
        private int _currentProgress;

        /// <summary>
        /// 标记安装是否已启动
        /// </summary>
        private bool _isStarted;

        /// <summary>
        /// 构造函数，初始化页面组件
        /// </summary>
        public InstallPage()
        {
            InitializeComponent();

            // 设置默认安装路径
            TxtInstallPath.Text = App.InstallPath;
        }

        /// <summary>
        /// 浏览按钮点击 - 选择安装路径
        /// </summary>
        private void BtnBrowse_Click(object sender, RoutedEventArgs e)
        {
            // 如果安装已开始则不允许更改路径
            if (_isStarted) return;

            // 使用文件夹浏览对话框选择安装路径
            var dialog = new System.Windows.Forms.FolderBrowserDialog
            {
                Description = "选择 Better-Seewo 安装路径",
                ShowNewFolderButton = true,
                SelectedPath = TxtInstallPath.Text
            };

            if (dialog.ShowDialog() == System.Windows.Forms.DialogResult.OK)
            {
                TxtInstallPath.Text = dialog.SelectedPath;
                App.InstallPath = dialog.SelectedPath;
            }
        }

        /// <summary>
        /// 开始安装过程（由主窗口调用）
        /// 模拟三个安装步骤：检测EN5 -> 复制文件 -> 注册插件
        /// </summary>
        public async void StartInstallation()
        {
            if (_isStarted) return;
            _isStarted = true;

            try
            {
                // 禁用路径输入和浏览按钮
                TxtInstallPath.IsReadOnly = true;

                // 更新安装路径
                App.InstallPath = TxtInstallPath.Text;

                // ===== 步骤 1：检测 EN5 安装状态 =====
                SetStepStatus(1, "running");
                AppendLog($"[{DateTime.Now:HH:mm:ss}] 正在检测 EasiNote5 安装状态...");
                await Task.Delay(800);

                // 检查 EN5 安装目录是否存在
                string en5Path = GetEn5InstallPath();
                bool en5Exists = !string.IsNullOrEmpty(en5Path) && Directory.Exists(en5Path);

                if (en5Exists)
                {
                    AppendLog($"[{DateTime.Now:HH:mm:ss}] 已检测到 EasiNote5 安装路径: {en5Path}");
                    SetStepStatus(1, "success");
                }
                else
                {
                    AppendLog($"[{DateTime.Now:HH:mm:ss}] 未检测到 EasiNote5 安装，将继续安装到指定路径");
                    SetStepStatus(1, "warning");
                }

                UpdateProgress(25);
                await Task.Delay(300);

                // ===== 步骤 2：复制插件文件 =====
                SetStepStatus(2, "running");
                AppendLog($"[{DateTime.Now:HH:mm:ss}] 正在复制插件文件...");
                await Task.Delay(600);

                // 创建目标目录
                string installDir = App.InstallPath;
                try
                {
                    if (!Directory.Exists(installDir))
                    {
                        Directory.CreateDirectory(installDir);
                        AppendLog($"[{DateTime.Now:HH:mm:ss}] 已创建安装目录: {installDir}");
                    }

                    // TODO: 实际安装时，将插件文件从安装包复制到目标目录
                    // 以下为模拟文件复制过程
                    string[] mockFiles = {
                        "Better-EN5.dll",
                        "Better-EN5.pdb",
                        "Newtonsoft.Json.dll",
                        "config.json"
                    };

                    foreach (var file in mockFiles)
                    {
                        await Task.Delay(200);
                        AppendLog($"[{DateTime.Now:HH:mm:ss}]   正在复制: {file}");
                        UpdateProgress(25 + (Array.IndexOf(mockFiles, file) + 1) * 10);
                    }

                    AppendLog($"[{DateTime.Now:HH:mm:ss}] 插件文件复制完成");
                    SetStepStatus(2, "success");
                }
                catch (Exception ex)
                {
                    AppendLog($"[{DateTime.Now:HH:mm:ss}] 复制文件失败: {ex.Message}");
                    SetStepStatus(2, "error");
                    throw;
                }

                await Task.Delay(300);

                // ===== 步骤 3：注册插件 =====
                SetStepStatus(3, "running");
                AppendLog($"[{DateTime.Now:HH:mm:ss}] 正在注册插件...");
                await Task.Delay(500);

                try
                {
                    // TODO: 实际安装时，写入注册表或配置文件完成插件注册
                    await Task.Delay(400);
                    AppendLog($"[{DateTime.Now:HH:mm:ss}]   正在写入插件配置...");
                    UpdateProgress(80);

                    await Task.Delay(300);
                    AppendLog($"[{DateTime.Now:HH:mm:ss}]   正在注册 EasiNote5 插件组件...");
                    UpdateProgress(90);

                    await Task.Delay(300);
                    AppendLog($"[{DateTime.Now:HH:mm:ss}] 插件注册完成");
                    SetStepStatus(3, "success");
                }
                catch (Exception ex)
                {
                    AppendLog($"[{DateTime.Now:HH:mm:ss}] 注册插件失败: {ex.Message}");
                    SetStepStatus(3, "error");
                    throw;
                }

                // ===== 安装完成 =====
                UpdateProgress(100);
                AppendLog($"[{DateTime.Now:HH:mm:ss}] ========================================");
                AppendLog($"[{DateTime.Now:HH:mm:ss}] 安装完成！Better-Seewo v{App.AppVersion} 已成功安装");
                AppendLog($"[{DateTime.Now:HH:mm:ss}] 安装路径: {App.InstallPath}");

                // 延迟后自动切换到完成页
                await Task.Delay(1000);

                // 通知主窗口安装完成
                if (Window.GetWindow(this) is MainWindow mainWindow)
                {
                    mainWindow.OnInstallCompleted();
                }
            }
            catch (Exception ex)
            {
                AppendLog($"[{DateTime.Now:HH:mm:ss}] 安装过程中发生错误: {ex.Message}");
                MessageBox.Show(
                    $"安装失败：{ex.Message}",
                    "Better-Seewo 安装程序",
                    MessageBoxButton.OK,
                    MessageBoxImage.Error
                );

                // 恢复按钮状态，允许重试
                if (Window.GetWindow(this) is MainWindow mainWindow)
                {
                    mainWindow.BtnInstall.IsEnabled = true;
                    mainWindow.BtnInstall.Content = "重试安装  \uE74E;";
                    mainWindow.BtnBack.IsEnabled = true;
                }

                App.IsInstalling = false;
                _isStarted = false;
            }
        }

        #region ===== 辅助方法 =====

        /// <summary>
        /// 获取 EasiNote5 的安装路径
        /// 检查常见的 EN5 安装目录
        /// </summary>
        private static string GetEn5InstallPath()
        {
            // 常见的 EasiNote5 安装路径
            string[] possiblePaths = {
                @"C:\Program Files (x86)\Seewo\EasiNote5",
                @"C:\Program Files\Seewo\EasiNote5",
                @"D:\Program Files (x86)\Seewo\EasiNote5",
                @"D:\Program Files\Seewo\EasiNote5"
            };

            foreach (var path in possiblePaths)
            {
                if (Directory.Exists(path))
                {
                    return path;
                }
            }

            return null;
        }

        /// <summary>
        /// 设置安装步骤的状态图标
        /// </summary>
        /// <param name="step">步骤编号（1-3）</param>
        /// <param name="status">状态：running/success/warning/error</param>
        private void SetStepStatus(int step, string status)
        {
            // 确保在 UI 线程执行
            Dispatcher.Invoke(() =>
            {
                var icon = step switch
                {
                    1 => Step1Icon,
                    2 => Step2Icon,
                    3 => Step3Icon,
                    _ => Step1Icon
                };

                if (icon == null) return;

                // 根据状态设置图标和颜色
                icon.Text = status switch
                {
                    "running" => "⏳",
                    "success" => "✓",
                    "warning" => "⚠",
                    "error" => "✗",
                    _ => "⏳"
                };

                icon.Foreground = status switch
                {
                    "running" => (System.Windows.Media.Brush)FindResource("WarningBrush"),
                    "success" => (System.Windows.Media.Brush)FindResource("SuccessBrush"),
                    "warning" => (System.Windows.Media.Brush)FindResource("WarningBrush"),
                    "error" => (System.Windows.Media.Brush)FindResource("ErrorBrush"),
                    _ => (System.Windows.Media.Brush)FindResource("TextSecondaryBrush")
                };
            });
        }

        /// <summary>
        /// 更新进度条和百分比文字
        /// </summary>
        /// <param name="progress">进度值（0-100）</param>
        private void UpdateProgress(int progress)
        {
            _currentProgress = Math.Clamp(progress, 0, 100);

            // 确保在 UI 线程执行
            Dispatcher.Invoke(() =>
            {
                // 更新百分比文字
                TxtProgress.Text = $"{_currentProgress}%";

                // 更新进度条宽度（使用动画）
                var widthAnimation = new DoubleAnimation
                {
                    From = (ProgressFill.ActualWidth > 0 ? ProgressFill.ActualWidth : 0),
                    To = (_currentProgress / 100.0) * ProgressFill.Parent.ActualWidth,
                    Duration = TimeSpan.FromMilliseconds(300),
                    EasingFunction = new CubicEase { EasingMode = EasingMode.EaseOut }
                };

                // 如果父容器尚未布局完成，直接设置宽度
                if (ProgressFill.Parent.ActualWidth == 0)
                {
                    // 等待布局完成后设置
                    ProgressFill.Loaded += (s, e) =>
                    {
                        var loadedAnimation = new DoubleAnimation
                        {
                            From = 0,
                            To = (_currentProgress / 100.0) * ProgressFill.Parent.ActualWidth,
                            Duration = TimeSpan.FromMilliseconds(300),
                            EasingFunction = new CubicEase { EasingMode = EasingMode.EaseOut }
                        };
                        ProgressFill.BeginAnimation(WidthProperty, loadedAnimation);
                    };
                }
                else
                {
                    ProgressFill.BeginAnimation(WidthProperty, widthAnimation);
                }
            });
        }

        /// <summary>
        /// 向日志文本框追加一行日志
        /// </summary>
        /// <param name="message">日志消息</param>
        private void AppendLog(string message)
        {
            // 确保在 UI 线程执行
            Dispatcher.Invoke(() =>
            {
                TxtLog.Text += message + Environment.NewLine;

                // 自动滚动到底部
                LogScrollViewer.ScrollToEnd();
            });
        }

        #endregion
    }
}