using System.Linq;
using IjwFramework.Collections;
using OpenRa.FileFormats;

namespace OpenRa.Graphics
{
	static class CursorSheetBuilder
	{
		static Cache<string, Sprite[]> cursors = new Cache<string, Sprite[]>(LoadCursors);
		static readonly string[] exts = { ".shp" };

		static Sprite[] LoadCursors(string filename)
		{
			try
			{
				var shp = new Dune2ShpReader(FileSystem.OpenWithExts(filename, exts));
				return shp.Select(a => SheetBuilder.Add(a.Image, a.Size)).ToArray();
			}
			catch (System.IndexOutOfRangeException) // This will occur when loading a custom (RA-format) .shp
			{
				var shp = new ShpReader(FileSystem.OpenWithExts(filename, exts));
				return shp.Select(a => SheetBuilder.Add(a.Image, shp.Size)).ToArray();
			}
		}

		public static Sprite[] LoadAllSprites(string filename) { return cursors[filename]; }
	}
}