// Based on: https://github.com/dotnet/runtime/blob/776dd1d3318760bf2328f66a544ed377d78b2099/src/libraries/Common/src/System/Drawing/ColorTable.cs
 
#nullable enable
using System;
using System.Collections.Generic;
using System.Reflection;
using SkiaSharp;
 
namespace Microsoft.Maui.Resizetizer
{
	static class ColorTable
	{
		static readonly Lazy<Dictionary<string, SKColor>> ColorConstants = new Lazy<Dictionary<string, SKColor>>(GetColors);
 
		static Dictionary<string, SKColor> GetColors()
		{
			var colors = new Dictionary<string, SKColor>(StringComparer.OrdinalIgnoreCase);
 
			// add from SKColors fields
			FillWithProperties(colors, typeof(SKColors));
 
			// add "grey" (with an "e") overloads
			colors.Add("DarkGrey", colors["DarkGray"]);
			colors.Add("DarkSlateGrey", colors["DarkSlateGray"]);
			colors.Add("DimGrey", colors["DimGray"]);
			colors.Add("Grey", colors["Gray"]);
			colors.Add("LightGrey", colors["LightGray"]);
			colors.Add("LightSlateGrey", colors["LightSlateGray"]);
			colors.Add("SlateGrey", colors["SlateGray"]);
 
			return colors;
		}
 
		static void FillWithProperties(Dictionary<string, SKColor> dictionary, Type typeWithColors)
		{
			foreach (FieldInfo field in typeWithColors.GetFields(BindingFlags.Public | BindingFlags.Static))
			{
				if (field.FieldType == typeof(SKColor))
					dictionary[field.Name] = (SKColor)field.GetValue(null)!;
			}
		}
 
		static Dictionary<string, SKColor> Colors => ColorConstants.Value;
 
		public static bool TryGetNamedColor(string name, out SKColor result) => Colors.TryGetValue(name, out result);
 
		public static bool IsKnownNamedColor(string name) => Colors.TryGetValue(name, out _);
	}
}