using System.Drawing;
using System.IO;

namespace ColorPickerApp
{
    internal static class IconPreview
    {
        private static void Main(string[] args)
        {
            string dir = Path.Combine(Path.GetTempPath(), "cp_preview");
            Directory.CreateDirectory(dir);
            FolderColorizer.ApplyColor(dir, Color.FromArgb(220, 40, 60));

            byte[] icoBytes = File.ReadAllBytes(Path.Combine(dir, ".colorpicker_folder.ico"));
            int count = System.BitConverter.ToUInt16(icoBytes, 4);
            // trouver l'entree 256x256 (largeur stockee = 0) avec le plus grand bytesInRes
            int bestOffset = -1, bestSize = -1, bestLen = 0;
            for (int i = 0; i < count; i++)
            {
                int entryOffset = 6 + i * 16;
                int w = icoBytes[entryOffset];
                int len = System.BitConverter.ToInt32(icoBytes, entryOffset + 8);
                int off = System.BitConverter.ToInt32(icoBytes, entryOffset + 12);
                if (w == 0 && len > bestLen) { bestLen = len; bestOffset = off; bestSize = w; }
            }
            var pngBytes = new byte[bestLen];
            System.Array.Copy(icoBytes, bestOffset, pngBytes, 0, bestLen);
            File.WriteAllBytes(Path.Combine(Path.GetTempPath(), "cp_icon_preview.png"), pngBytes);

            FolderColorizer.RestoreDefault(dir);
            Directory.Delete(dir, true);
        }
    }
}