crysome/Crysome.Server/Crysome.Server.Converters/FlagConverter.cs

using System;
using System.Collections.Generic;
using System.Globalization;
using System.IO;
using System.Windows;
using System.Windows.Data;
using System.Windows.Media.Imaging;

namespace Crysome.Server.Converters;

public class FlagConverter : IValueConverter
{
	private static readonly Dictionary<string, BitmapImage> Cache = new Dictionary<string, BitmapImage>(StringComparer.OrdinalIgnoreCase);

	private static bool _loaded;

	public object Convert(object value, Type targetType, object parameter, CultureInfo culture)
	{
		if (value == null)
		{
			return null;
		}
		string text = value.ToString().Trim().ToUpperInvariant();
		if (string.IsNullOrEmpty(text))
		{
			return null;
		}
		if (!_loaded)
		{
			LoadAll();
		}
		if (Cache.TryGetValue(text, out var value2))
		{
			return value2;
		}
		return null;
	}

	public object ConvertBack(object value, Type targetType, object parameter, CultureInfo culture)
	{
		return DependencyProperty.UnsetValue;
	}

	private static void LoadAll()
	{
		_loaded = true;
		string baseDirectory = AppDomain.CurrentDomain.BaseDirectory;
		string[] array = new string[2]
		{
			Path.Combine(baseDirectory, "flags"),
			baseDirectory
		};
		foreach (string path in array)
		{
			if (!Directory.Exists(path))
			{
				continue;
			}
			string[] files = Directory.GetFiles(path, "*.png");
			foreach (string text in files)
			{
				try
				{
					string text2 = Path.GetFileNameWithoutExtension(text).ToUpperInvariant();
					if (!text2.Contains("@") && text2.Length == 2 && !Cache.ContainsKey(text2))
					{
						BitmapImage bitmapImage = new BitmapImage();
						bitmapImage.BeginInit();
						bitmapImage.UriSource = new Uri(text);
						bitmapImage.DecodePixelHeight = 16;
						bitmapImage.CacheOption = BitmapCacheOption.OnLoad;
						bitmapImage.EndInit();
						((Freezable)bitmapImage).Freeze();
						Cache[text2] = bitmapImage;
					}
				}
				catch
				{
				}
			}
		}
	}
}