// C# Script: 다이아몬드 픽셀 아이콘 생성 (PNG → ICO)
// 실행: dotnet-script GenerateIcon.csx
// 또는 별도 콘솔 앱으로 빌드

using System;
using System.Drawing;
using System.Drawing.Drawing2D;
using System.Drawing.Imaging;
using System.IO;

// 여러 크기로 생성
int[] sizes = { 16, 24, 32, 48, 64, 128, 256 };
string outputDir = Path.Combine(Path.GetDirectoryName(Environment.ProcessPath) ?? ".", "output");
Directory.CreateDirectory(outputDir);

foreach (var size in sizes)
{
    using var bmp = DrawDiamondPixel(size);
    bmp.Save(Path.Combine(outputDir, $"icon_{size}.png"), ImageFormat.Png);
    Console.WriteLine($"Generated icon_{size}.png");
}

// ICO 파일 생성
CreateIco(sizes.Select(s => Path.Combine(outputDir, $"icon_{s}.png")).ToArray(),
          Path.Combine(outputDir, "icon.ico"));
Console.WriteLine("Generated icon.ico");

static Bitmap DrawDiamondPixel(int size)
{
    var bmp = new Bitmap(size, size, PixelFormat.Format32bppArgb);
    using var g = Graphics.FromImage(bmp);
    g.SmoothingMode = SmoothingMode.HighQuality;
    g.Clear(Color.Transparent);

    float cx = size / 2f;
    float cy = size * 0.47f; // 약간 위쪽 중심
    float w = size * 0.44f;  // 좌우 반폭
    float ht = size * 0.27f; // 상단 높이
    float hb = size * 0.23f; // 하단 높이

    // 꼭짓점
    PointF top = new(cx, cy - ht);
    PointF right = new(cx + w, cy);
    PointF bottom = new(cx, cy + hb);
    PointF left = new(cx - w, cy);
    PointF center = new(cx, cy);

    // 좌상 - Blue
    using (var brush = new LinearGradientBrush(top, center, Color.FromArgb(91, 141, 239), Color.FromArgb(45, 95, 204)))
    {
        g.FillPolygon(brush, new[] { top, center, left });
    }
    // 우상 - Green
    using (var brush = new LinearGradientBrush(top, center, Color.FromArgb(126, 217, 87), Color.FromArgb(76, 175, 80)))
    {
        g.FillPolygon(brush, new[] { top, right, center });
    }
    // 좌하 - Red
    using (var brush = new LinearGradientBrush(left, bottom, Color.FromArgb(255, 77, 106), Color.FromArgb(229, 57, 53)))
    {
        g.FillPolygon(brush, new[] { left, center, bottom });
    }
    // 우하 - Green (darker)
    using (var brush = new LinearGradientBrush(right, bottom, Color.FromArgb(102, 187, 106), Color.FromArgb(67, 160, 71)))
    {
        g.FillPolygon(brush, new[] { right, center, bottom });
    }

    // 갭 라인
    float gap = Math.Max(1, size / 128f);
    using var pen = new Pen(Color.FromArgb(200, 10, 10, 20), gap);
    g.DrawLine(pen, top, bottom);
    g.DrawLine(pen, left, right);

    // 외곽 하이라이트
    float border = Math.Max(0.5f, size / 256f);
    using var borderPen = new Pen(Color.FromArgb(60, 255, 255, 255), border);
    g.DrawPolygon(borderPen, new[] { top, right, bottom, left });

    return bmp;
}

static void CreateIco(string[] pngPaths, string icoPath)
{
    using var ms = new MemoryStream();
    using var bw = new BinaryWriter(ms);

    var pngData = pngPaths.Select(p => File.ReadAllBytes(p)).ToArray();

    // ICO Header
    bw.Write((short)0);  // Reserved
    bw.Write((short)1);  // ICO type
    bw.Write((short)pngData.Length);  // Image count

    int offset = 6 + (16 * pngData.Length);  // After header + entries

    foreach (var png in pngData)
    {
        using var img = Image.FromStream(new MemoryStream(png));
        bw.Write((byte)(img.Width >= 256 ? 0 : img.Width));
        bw.Write((byte)(img.Height >= 256 ? 0 : img.Height));
        bw.Write((byte)0);   // Color palette
        bw.Write((byte)0);   // Reserved
        bw.Write((short)1);  // Color planes
        bw.Write((short)32); // Bits per pixel
        bw.Write(png.Length); // Size
        bw.Write(offset);    // Offset
        offset += png.Length;
    }

    foreach (var png in pngData)
        bw.Write(png);

    File.WriteAllBytes(icoPath, ms.ToArray());
}