using WPFluent.Extensions;
using WPFluent.Interop;

namespace WPFluent.Appearance;

/// <summary>
/// 允许通过交换动态资源来更新应用程序中控件使用的Accent。
/// </summary>
/// <example>
/// <code lang="csharp"> 
/// AccentColorManager.ChangeAppTheme(Color.FromArgb(0xFF, 0xEE, 0x00, 0xBB),ThemeType.Dark,false); 
/// </code> 
/// <code lang="csharp">
/// AccentColorManager.ChangeAppTheme(AccentColorManager.GetColorizationColor(),ThemeType.Dark,false); 
///</code>
/// </example>
public static class AccentColorManager
{
    /// <summary>
    /// 背景 HSV 亮度的最大值，超过该值后，重音上的文字将变暗。
    /// </summary>
    private const double BackgroundBrightnessThresholdValue = 80d;

    /// <summary>
    /// Updates application resources.
    /// </summary>
    private static void UpdateColorResources(
        Color systemAccent,
        Color primaryAccent,
        Color secondaryAccent,
        Color tertiaryAccent)
    {

        if (secondaryAccent.GetBrightness() > BackgroundBrightnessThresholdValue)
        {
            System.Diagnostics.Debug.WriteLine("INFO | Text on accent is DARK", "WPFluent.Primary");
            ThemeManager.Current.Resources["TextOnAccentFillColorPrimary"] = Color.FromArgb(0xFF, 0x00, 0x00, 0x00);
            ThemeManager.Current.Resources["TextOnAccentFillColorSecondary"] = Color.FromArgb(0x80, 0x00, 0x00, 0x00);
            ThemeManager.Current.Resources["TextOnAccentFillColorDisabled"] = Color.FromArgb(0x77, 0x00, 0x00, 0x00);
            ThemeManager.Current.Resources["TextOnAccentFillColorSelectedText"] = Color.FromArgb(
                0x00,
                0x00,
                0x00,
                0x00);
            ThemeManager.Current.Resources["AccentTextFillColorDisabled"] = Color.FromArgb(0x5D, 0x00, 0x00, 0x00);
        }
        else
        {
            System.Diagnostics.Debug.WriteLine("INFO | Text on accent is LIGHT", "WPFluent.Primary");
            ThemeManager.Current.Resources["TextOnAccentFillColorPrimary"] = Color.FromArgb(0xFF, 0xFF, 0xFF, 0xFF);
            ThemeManager.Current.Resources["TextOnAccentFillColorSecondary"] = Color.FromArgb(0x80, 0xFF, 0xFF, 0xFF);
            ThemeManager.Current.Resources["TextOnAccentFillColorDisabled"] = Color.FromArgb(0x87, 0xFF, 0xFF, 0xFF);
            ThemeManager.Current.Resources["TextOnAccentFillColorSelectedText"] = Color.FromArgb(
                0xFF,
                0xFF,
                0xFF,
                0xFF);
            ThemeManager.Current.Resources["AccentTextFillColorDisabled"] = Color.FromArgb(0x5D, 0xFF, 0xFF, 0xFF);
        }

        ThemeManager.Current.Resources["SystemAccentColor"] = systemAccent;
        ThemeManager.Current.Resources["SystemFillColorAttention"] = primaryAccent;
        ThemeManager.Current.Resources["SystemAccentColorSecondary"] = secondaryAccent;
        ThemeManager.Current.Resources["SystemAccentColorTertiary"] = tertiaryAccent;

        ThemeManager.Current.Resources["SystemAccentBrush"] = secondaryAccent.ToBrush();
        ThemeManager.Current.Resources["SystemFillColorAttentionBrush"] = secondaryAccent.ToBrush();
        ThemeManager.Current.Resources["AccentTextFillColorPrimaryBrush"] = tertiaryAccent.ToBrush();
        ThemeManager.Current.Resources["AccentTextFillColorSecondaryBrush"] = tertiaryAccent.ToBrush();
        ThemeManager.Current.Resources["AccentTextFillColorTertiaryBrush"] = secondaryAccent.ToBrush();
        ThemeManager.Current.Resources["AccentFillColorSelectedTextBackgroundBrush"] =
            systemAccent.ToBrush();
        ThemeManager.Current.Resources["AccentFillColorDefaultBrush"] = secondaryAccent.ToBrush();

        ThemeManager.Current.Resources["AccentFillColorSecondaryBrush"] = secondaryAccent.ToBrush(0.9);
        ThemeManager.Current.Resources["AccentFillColorTertiaryBrush"] = secondaryAccent.ToBrush(0.8);
    }

    /// <summary>
    /// 根据输入的颜色更改应用程序的色彩基调。
    /// </summary>
    /// <param name="systemAccent">原色强调色。</param>
    /// <param name="applicationTheme">如果是<see cref="ThemeType.Dark"/>，颜色将有所不同。</param>
    /// <param name="systemGlassColor">
    /// 如果颜色取自玻璃色彩系统，则其亮度将借助 HSV 空间的操作而提高。
    /// </param>
    public static void Apply(
        Color systemAccent,
        ThemeType applicationTheme = ThemeType.Light,
        bool systemGlassColor = false)
    {
        if (systemGlassColor)
        {
            // WindowGlassColor 比强调色深一点
            systemAccent = systemAccent.UpdateBrightness(6f);
        }

        Color primaryAccent;
        Color secondaryAccent;
        Color tertiaryAccent;

        if (applicationTheme == ThemeType.Dark)
        {
            primaryAccent = systemAccent.Update(15f, -12f);
            secondaryAccent = systemAccent.Update(30f, -24f);
            tertiaryAccent = systemAccent.Update(45f, -36f);
        }
        else
        {
            primaryAccent = systemAccent.UpdateBrightness(-5f);
            secondaryAccent = systemAccent.UpdateBrightness(-10f);
            tertiaryAccent = systemAccent.UpdateBrightness(-15f);
        }

        UpdateColorResources(systemAccent, primaryAccent, secondaryAccent, tertiaryAccent);
    }

    /// <summary>
    /// 根据输入的颜色更改应用程序的强调色。
    /// </summary>
    /// <param name="systemAccent">主色调</param>
    /// <param name="primaryAccent">浅色或深色可供选择。</param>
    /// <param name="secondaryAccent">第二种备选的浅色或深色（最常用）。</param>
    /// <param name="tertiaryAccent">第三种备选的浅色或深色。</param>
    public static void Apply(Color systemAccent, Color primaryAccent, Color secondaryAccent, Color tertiaryAccent)
    { UpdateColorResources(systemAccent, primaryAccent, secondaryAccent, tertiaryAccent); }

    /// <summary>
    /// 获取SystemFillColorAttention.
    /// </summary>
    public static Color PrimaryAccent
    {
        get
        {
            object? resource = ThemeManager.Current.Resources["SystemFillColorAttention"];

            if (resource is Color color)
            {
                return color;
            }

            return Colors.Transparent;
        }
    }

    /// <summary>
    /// Gets the <see cref="Brush"/> of the SystemFillColorAttention.
    /// </summary>
    public static Brush PrimaryAccentBrush => new SolidColorBrush(PrimaryAccent);

    /// <summary>
    /// Gets the SystemAccentColorSecondary.
    /// </summary>
    public static Color SecondaryAccent
    {
        get
        {
            object? resource = ThemeManager.Current.Resources["SystemAccentColorSecondary"];

            if (resource is Color color)
            {
                return color;
            }

            return Colors.Transparent;
        }
    }

    /// <summary>
    /// Gets the <see cref="Brush"/> of the SystemAccentColorSecondary.
    /// </summary>
    public static Brush SecondaryAccentBrush => new SolidColorBrush(SecondaryAccent);

    /// <summary>
    /// Gets the SystemAccentColor.
    /// </summary>
    public static Color SystemAccent
    {
        get
        {
            object? resource = ThemeManager.Current.Resources["SystemAccentColor"];

            if (resource is Color color)
            {
                return color;
            }

            return Colors.Transparent;
        }
    }

    /// <summary>
    /// Gets the <see cref="Brush"/> of the SystemAccentColor.
    /// </summary>
    public static Brush SystemAccentBrush => new SolidColorBrush(SystemAccent);

    /// <summary>
    /// Gets the SystemAccentColorTertiary.
    /// </summary>
    public static Color TertiaryAccent
    {
        get
        {
            object? resource = ThemeManager.Current.Resources["SystemAccentColorTertiary"];

            if (resource is Color color)
            {
                return color;
            }

            return Colors.Transparent;
        }
    }

    /// <summary>
    /// Gets the <see cref="Brush"/> of the SystemAccentColorTertiary.
    /// </summary>
    public static Brush TertiaryAccentBrush => new SolidColorBrush(TertiaryAccent);
}