Windows-Gotify-Client/Converters/ValueConverters.cs

using System.Globalization;
using System.Windows;
using System.Windows.Data;
using System.Windows.Media;

// 双开 WPF + WinForms 时,这几个类型两个命名空间都有,固定走 WPF 的。
using Application = System.Windows.Application;
using Color = System.Windows.Media.Color;
using Brush = System.Windows.Media.Brush;

namespace WindowsGotify;

public sealed class PriorityToBrushConverter : IValueConverter
{
    public object Convert(object value, Type targetType, object? parameter, CultureInfo culture)
    {
        if (parameter is string p && p == "hideIfEmpty" && value is string s)
        {
            return string.IsNullOrWhiteSpace(s) || s == "(无标题)" ? Visibility.Collapsed : Visibility.Visible;
        }

        if (value is int p1)
        {
            // 从主题字典里取色,跟着 Theme 切换走
            var key = p1 switch
            {
                >= 8 => "PriorityUrgent",
                >= 5 => "PriorityHigh",
                >= 1 => "PriorityNormal",
                _    => "PriorityLow"
            };
            if (Application.Current?.TryFindResource(key) is Brush b) return b;
            return new SolidColorBrush(Colors.Gray);
        }
        return new SolidColorBrush(Colors.Gray);
    }

    public object ConvertBack(object value, Type targetType, object? parameter, CultureInfo culture)
        => throw new NotSupportedException();
}

/// <summary>
/// 应用名 → 稳定颜色(用名字的 hash 决定 hue),让每个应用在历史里视觉上可区分。
/// </summary>
public sealed class AppNameToBrushConverter : IValueConverter
{
    public object Convert(object value, Type targetType, object? parameter, CultureInfo culture)
    {
        var name = value as string ?? "";
        if (string.IsNullOrWhiteSpace(name)) return new SolidColorBrush(Color.FromRgb(0x55, 0x55, 0x55));

        // 简单 FNV-1a 32-bit hash → hue 0..360
        uint hash = 2166136261u;
        foreach (var c in name)
        {
            hash ^= c;
            hash *= 16777619u;
        }
        var hue = hash % 360;
        return new SolidColorBrush(HsvToColor(hue, 0.55, 0.75));
    }

    private static Color HsvToColor(double hue, double sat, double val)
    {
        var c = val * sat;
        var x = c * (1 - Math.Abs((hue / 60) % 2 - 1));
        var m = val - c;
        double r, g, b;
        if (hue < 60) { r = c; g = x; b = 0; }
        else if (hue < 120) { r = x; g = c; b = 0; }
        else if (hue < 180) { r = 0; g = c; b = x; }
        else if (hue < 240) { r = 0; g = x; b = c; }
        else if (hue < 300) { r = x; g = 0; b = c; }
        else { r = c; g = 0; b = x; }
        return Color.FromRgb(
            (byte)Math.Round((r + m) * 255),
            (byte)Math.Round((g + m) * 255),
            (byte)Math.Round((b + m) * 255));
    }

    public object ConvertBack(object value, Type targetType, object? parameter, CultureInfo culture)
        => throw new NotSupportedException();
}