using Avalonia.Media;

namespace Nonemm.App.Windows;

/// The twelve palettes N1MM's statistics graph offers. The names are the ones
/// in N1MM's box, which are the .NET chart control's palettes; the colours are
/// chosen to match the name, not copied out of that control.
public static class ChartPalettes
{
    public static readonly IReadOnlyList<string> Names =
    [
        "Berry", "Bright", "Bright Pastel", "Chocolate", "Earth Tones", "Excel",
        "Fire", "Gray Scale", "Light", "Pastel", "Sea Green", "Semi Transparent",
    ];

    private static readonly Dictionary<string, uint[]> Colours = new()
    {
        ["Berry"] = [0x8A2BE2, 0xBA55D3, 0xC71585, 0xDA70D6, 0x7B68EE, 0x9370DB, 0xFF69B4, 0x4B0082],
        ["Bright"] = [0x1F77B4, 0xFF7F0E, 0x2CA02C, 0xD62728, 0x9467BD, 0x8C564B, 0xE377C2, 0x17BECF],
        ["Bright Pastel"] = [0x418CF0, 0xFCB441, 0xE0400A, 0x056492, 0xBFBFBF, 0x1A3B69, 0xFFE382, 0x129CDD],
        ["Chocolate"] = [0x5B3A29, 0x8B4513, 0xA0522D, 0xCD853F, 0xD2B48C, 0x6B4226, 0xB87333, 0xE3C6A0],
        ["Earth Tones"] = [0x6B8E23, 0x808000, 0xBDB76B, 0x8B7355, 0x556B2F, 0xA0522D, 0xC0A16B, 0x4F5D2F],
        ["Excel"] = [0x4472C4, 0xED7D31, 0xA5A5A5, 0xFFC000, 0x5B9BD5, 0x70AD47, 0x264478, 0x9E480E],
        ["Fire"] = [0xB22222, 0xE34A00, 0xFF8C00, 0xFFC000, 0xFFE873, 0x8B0000, 0xFF4500, 0xFFA07A],
        ["Gray Scale"] = [0x2B2B2B, 0x4D4D4D, 0x6E6E6E, 0x8F8F8F, 0xB0B0B0, 0xC9C9C9, 0xE0E0E0, 0xF2F2F2],
        ["Light"] = [0xA6CEE3, 0xB2DF8A, 0xFDBF6F, 0xCAB2D6, 0xFB9A99, 0xFFFF99, 0xB3E2CD, 0xD9D9D9],
        ["Pastel"] = [0xAEC7E8, 0xFFBB78, 0x98DF8A, 0xFF9896, 0xC5B0D5, 0xC49C94, 0xF7B6D2, 0x9EDAE5],
        ["Sea Green"] = [0x2E8B57, 0x3CB371, 0x20B2AA, 0x66CDAA, 0x008B8B, 0x5F9EA0, 0x8FBC8F, 0x006400],
        ["Semi Transparent"] = [0x1F77B4, 0xFF7F0E, 0x2CA02C, 0xD62728, 0x9467BD, 0x8C564B, 0xE377C2, 0x17BECF],
    };

    /// The palette of that name, or the first one when there is no such name.
    /// A series past the end of the list takes a colour again from the start,
    /// as the chart control does.
    public static IReadOnlyList<Color> Of(string name)
    {
        uint[] values = Colours.TryGetValue(name, out uint[]? found) ? found : Colours["Berry"];
        byte alpha = name == "Semi Transparent" ? (byte)0xA0 : (byte)0xFF;
        return [.. values.Select(v => Color.FromArgb(
            alpha,
            (byte)(v >> 16),
            (byte)(v >> 8),
            (byte)v))];
    }
}