/*
 * MainWindow.xaml.cs - Better-Seewo 管理器主窗口逻辑
 * 负责自定义标题栏拖动、窗口控制、页面导航、主题切换和动画效果
 * 作者：雾启工作室
 */

using System;
using System.Windows;
using System.Windows.Controls;
using System.Windows.Input;
using System.Windows.Media;
using System.Windows.Media.Animation;

namespace Better_Seewo.Manager
{
    /// <summary>
    /// MainWindow 的交互逻辑 - Fluent Design 风格主窗口
    /// </summary>
    public partial class MainWindow : Window
    {
        /// <summary>
        /// 导航指示条动画时长（毫秒）
        /// </summary>
        private const int IndicatorAnimationDuration = 200;

        /// <summary>
        /// 页面淡入淡出动画时长（毫秒）
        /// </summary>
        private const int PageTransitionDuration = 300;

        /// <summary>
        /// 指示条目标宽度
        /// </summary>
        private const double IndicatorTargetWidth = 3;

        /// <summary>
        /// 当前选中的导航按钮名称
        /// </summary>
        private string _currentNavTag = "Install";

        /// <summary>
        /// 构造函数，初始化窗口组件
        /// </summary>
        public MainWindow()
        {
            InitializeComponent();
            // 默认选中安装页面
            SetActiveNavigation("BtnInstall", "IndicatorInstall");
        }

        /// <summary>
        /// 窗口加载完成事件处理 - 触发入场动画和初始页面加载
        /// </summary>
        private void Window_Loaded(object sender, RoutedEventArgs e)
        {
            // 入场动画已通过 XAML Trigger 触发
            // 导航到默认页面
            NavigateToPage("Install");
        }

        #region ===== 自定义标题栏拖动 =====

        /// <summary>
        /// 标题栏鼠标左键按下 - 实现窗口拖动
        /// </summary>
        private void TitleBar_MouseLeftButtonDown(object sender, MouseButtonEventArgs e)
        {
            // 如果点击的是按钮区域则不触发拖动
            if (e.Source is Button) return;

            // 调用 DragMove 实现窗口拖动
            if (e.LeftButton == MouseButtonState.Pressed)
            {
                DragMove();
            }
        }

        /// <summary>
        /// 标题栏鼠标双击 - 切换最大化/还原
        /// </summary>
        protected override void OnMouseLeftButtonDown(MouseButtonEventArgs e)
        {
            base.OnMouseLeftButtonDown(e);

            // 双击标题栏区域切换窗口状态
            if (e.ClickCount == 2)
            {
                ToggleMaximize();
            }
        }

        #endregion

        #region ===== 窗口控制按钮 =====

        /// <summary>
        /// 最小化按钮点击
        /// </summary>
        private void BtnMinimize_Click(object sender, RoutedEventArgs e)
        {
            // 将窗口最小化到任务栏
            WindowState = WindowState.Minimized;
        }

        /// <summary>
        /// 最大化/还原按钮点击
        /// </summary>
        private void BtnMaximize_Click(object sender, RoutedEventArgs e)
        {
            ToggleMaximize();
        }

        /// <summary>
        /// 关闭按钮点击 - 关闭应用程序
        /// </summary>
        private void BtnClose_Click(object sender, RoutedEventArgs e)
        {
            Application.Current.Shutdown();
        }

        /// <summary>
        /// 切换窗口最大化/还原状态
        /// </summary>
        private void ToggleMaximize()
        {
            if (WindowState == WindowState.Maximized)
            {
                WindowState = WindowState.Normal;
                // 更新按钮图标为最大化图标
                BtnMaximize.Content = "\uE922";
            }
            else
            {
                WindowState = WindowState.Maximized;
                // 更新按钮图标为还原图标
                BtnMaximize.Content = "\uE923";
            }
        }

        #endregion

        #region ===== 导航按钮切换 =====

        /// <summary>
        /// 导航按钮点击事件 - 切换Frame页面内容
        /// </summary>
        private void NavButton_Click(object sender, RoutedEventArgs e)
        {
            if (sender is Button btn && btn.Tag is string tag)
            {
                // 如果点击的是当前已选中项，则忽略
                if (tag == _currentNavTag) return;

                // 更新当前选中项
                _currentNavTag = tag;

                // 根据按钮名称设置选中状态和指示条动画
                SetActiveNavigation(btn.Name, GetIndicatorName(btn.Name));

                // 导航到对应页面
                NavigateToPage(tag);
            }
        }

        /// <summary>
        /// 根据按钮名称获取对应的指示条名称
        /// </summary>
        /// <param name="buttonName">按钮名称</param>
        /// <returns>指示条名称</returns>
        private string GetIndicatorName(string buttonName)
        {
            return buttonName switch
            {
                "BtnInstall" => "IndicatorInstall",
                "BtnInk" => "IndicatorInk",
                "BtnConvert" => "IndicatorConvert",
                "BtnTouch" => "IndicatorTouch",
                "BtnActivate" => "IndicatorActivate",
                _ => "IndicatorInstall"
            };
        }

        /// <summary>
        /// 设置当前选中的导航按钮，并触发指示条动画
        /// </summary>
        /// <param name="activeButtonName">选中的按钮名称</param>
        /// <param name="activeIndicatorName">对应的指示条名称</param>
        private void SetActiveNavigation(string activeButtonName, string activeIndicatorName)
        {
            // 所有导航按钮列表
            string[] buttonNames = { "BtnInstall", "BtnInk", "BtnConvert", "BtnTouch", "BtnActivate" };
            // 所有指示条列表
            string[] indicatorNames = { "IndicatorInstall", "IndicatorInk", "IndicatorConvert", "IndicatorTouch", "IndicatorActivate" };

            for (int i = 0; i < buttonNames.Length; i++)
            {
                // 查找按钮
                var btn = FindName(buttonNames[i]) as Button;
                // 查找指示条
                var indicator = FindName(indicatorNames[i]) as Border;

                if (btn == null || indicator == null) continue;

                if (buttonNames[i] == activeButtonName)
                {
                    // 选中状态：高亮前景色，显示指示条
                    btn.Foreground = (Brush)FindResource("AccentBrush");

                    // 播放指示条展开动画（宽度从0到3px）
                    AnimateIndicatorWidth(indicator, IndicatorTargetWidth);
                }
                else
                {
                    // 非选中状态：恢复默认前景色，隐藏指示条
                    btn.Foreground = (Brush)FindResource("TextSecondaryBrush");

                    // 播放指示条收缩动画（宽度从当前值到0）
                    AnimateIndicatorWidth(indicator, 0);
                }
            }
        }

        /// <summary>
        /// 为导航指示条播放宽度动画
        /// </summary>
        /// <param name="indicator">指示条控件</param>
        /// <param name="targetWidth">目标宽度</param>
        private void AnimateIndicatorWidth(Border indicator, double targetWidth)
        {
            if (indicator == null) return;

            // 创建宽度动画
            var widthAnimation = new DoubleAnimation
            {
                From = indicator.Width,
                To = targetWidth,
                Duration = TimeSpan.FromMilliseconds(IndicatorAnimationDuration),
                EasingFunction = new CubicEase { EasingMode = EasingMode.EaseInOut }
            };

            // 应用动画到指示条的Width属性
            indicator.BeginAnimation(WidthProperty, widthAnimation);
        }

        #endregion

        #region ===== 页面导航 =====

        /// <summary>
        /// 导航到指定页面，带淡入淡出动画效果
        /// </summary>
        /// <param name="pageTag">页面标识（Install/Ink/Convert/Touch/Activate）</param>
        private void NavigateToPage(string pageTag)
        {
            // 创建淡出动画（当前页面）
            var fadeOutAnimation = new DoubleAnimation
            {
                From = 1.0,
                To = 0.0,
                Duration = TimeSpan.FromMilliseconds(PageTransitionDuration / 2),
                EasingFunction = new CubicEase { EasingMode = EasingMode.EaseIn }
            };

            // 淡出动画完成后切换页面
            fadeOutAnimation.Completed += (s, e) =>
            {
                // 根据页面标识加载对应页面
                // TODO: 创建各个功能页面后取消注释
                // switch (pageTag)
                // {
                //     case "Install":
                //         ContentFrame.Navigate(new Pages.InstallPage());
                //         break;
                //     case "Ink":
                //         ContentFrame.Navigate(new Pages.InkPage());
                //         break;
                //     case "Convert":
                //         ContentFrame.Navigate(new Pages.ConvertPage());
                //         break;
                //     case "Touch":
                //         ContentFrame.Navigate(new Pages.TouchPage());
                //         break;
                //     case "Activate":
                //         ContentFrame.Navigate(new Pages.ActivatePage());
                //         break;
                // }

                // 创建淡入动画（新页面）
                var fadeInAnimation = new DoubleAnimation
                {
                    From = 0.0,
                    To = 1.0,
                    Duration = TimeSpan.FromMilliseconds(PageTransitionDuration / 2),
                    EasingFunction = new CubicEase { EasingMode = EasingMode.EaseOut }
                };

                // 应用淡入动画到Frame
                ContentFrame.BeginAnimation(OpacityProperty, fadeInAnimation);
            };

            // 应用淡出动画到Frame
            ContentFrame.BeginAnimation(OpacityProperty, fadeOutAnimation);
        }

        #endregion

        #region ===== 主题切换 =====

        /// <summary>
        /// 主题切换按钮点击事件
        /// </summary>
        private void BtnThemeToggle_Click(object sender, RoutedEventArgs e)
        {
            // 切换到相反主题
            bool newIsDark = !App.IsDarkTheme;

            // 调用 App.SwitchTheme 切换主题资源
            App.SwitchTheme(newIsDark);

            // 更新主题图标
            UpdateThemeIcon(newIsDark);
        }

        /// <summary>
        /// 根据当前主题更新切换按钮的图标
        /// </summary>
        /// <param name="isDark">当前是否为深色主题</param>
        private void UpdateThemeIcon(bool isDark)
        {
            if (ThemeIcon == null) return;

            if (isDark)
            {
                // 深色主题时显示太阳图标（提示可以切换到浅色）
                ThemeIcon.Data = Geometry.Parse(
                    "M12,7A5,5 0 0,1 17,12A5,5 0 0,1 12,17A5,5 0 0,1 7,12A5,5 0 0,1 12,7M12,9A3,3 0 0,0 9,12A3,3 0 0,0 12,15A3,3 0 0,0 15,12A3,3 0 0,0 12,9M12,2L14.39,5.42C13.73,5.14 13,5 12,5C11,5 10.27,5.14 9.61,5.42L12,2M3.34,7L7.5,6.35C7,7 6.63,7.73 6.43,8.5L3.34,7M3.36,17L6.44,15.5C6.64,16.28 7,17 7.5,17.65L3.36,17M20.64,7L17.55,8.5C17.36,7.72 17,7 16.5,6.35L20.64,7M20.65,17L16.5,17.65C17,17 17.37,16.27 17.57,15.5L20.65,17M12,22L9.61,18.58C10.27,18.86 11,19 12,19C13,19 13.73,18.86 14.39,18.58L12,22Z"
                );
            }
            else
            {
                // 浅色主题时显示月亮图标（提示可以切换到深色）
                ThemeIcon.Data = Geometry.Parse(
                    "M17.75,4.09L15.22,6.03L16.13,9.09L13.5,7.28L10.87,9.09L11.78,6.03L9.25,4.09L12.44,4L13.5,1L14.56,4L17.75,4.09M21.25,11L19.61,12.25L20.2,14.23L18.5,13.06L16.8,14.23L17.39,12.25L15.75,11L17.81,10.95L18.5,9L19.19,10.95L21.25,11M18.97,15.95C19.8,15.87 20.69,17.05 20.16,17.8C19.84,18.25 19.38,18.57 18.97,18.95C16.73,21.04 14.04,22.5 11,22.5C7.96,22.5 5.27,21.04 3.03,18.95C2.62,18.57 2.16,18.25 1.84,17.8C1.31,17.05 2.2,15.87 3.03,15.95C7.33,16.37 10.17,12.37 11,9.42C11.83,12.37 14.67,16.37 18.97,15.95Z"
                );
            }
        }

        #endregion
    }
}