// Generate simple placeholder icons for TaxPack
const fs = require('fs');
const path = require('path');
const zlib = require('zlib');

function createSimplePNG(size, r, g, b) {
  const width = size;
  const height = size;
  
  const signature = Buffer.from([0x89, 0x50, 0x4E, 0x47, 0x0D, 0x0A, 0x1A, 0x0A]);
  
  const ihdrData = Buffer.alloc(13);
  ihdrData.writeUInt32BE(width, 0);
  ihdrData.writeUInt32BE(height, 4);
  ihdrData[8] = 8;
  ihdrData[9] = 2;
  ihdrData[10] = 0;
  ihdrData[11] = 0;
  ihdrData[12] = 0;
  
  const ihdr = createChunk('IHDR', ihdrData);
  
  const rowSize = 1 + width * 3;
  const imageData = Buffer.alloc(height * rowSize);
  for (let y = 0; y < height; y++) {
    imageData[y * rowSize] = 0;
    for (let x = 0; x < width; x++) {
      const idx = y * rowSize + 1 + x * 3;
      imageData[idx] = r;
      imageData[idx + 1] = g;
      imageData[idx + 2] = b;
    }
  }
  
  const compressed = zlib.deflateSync(imageData);
  const idat = createChunk('IDAT', compressed);
  const iend = createChunk('IEND', Buffer.alloc(0));
  
  return Buffer.concat([signature, ihdr, idat, iend]);
}

function createChunk(type, data) {
  const length = Buffer.alloc(4);
  length.writeUInt32BE(data.length, 0);
  const typeBuf = Buffer.from(type, 'ascii');
  const crc = zlib.crc32(Buffer.concat([typeBuf, data]));
  const crcBuf = Buffer.alloc(4);
  crcBuf.writeUInt32BE(crc >>> 0, 0);
  return Buffer.concat([length, typeBuf, data, crcBuf]);
}

const iconsDir = path.join(__dirname, 'public', 'icons');
fs.mkdirSync(iconsDir, { recursive: true });

const purple = { r: 107, g: 99, b: 182 };

[16, 48, 128].forEach(size => {
  const png = createSimplePNG(size, purple.r, purple.g, purple.b);
  fs.writeFileSync(path.join(iconsDir, `icon${size}.png`), png);
  console.log(`Created icon${size}.png`);
});

console.log('Icons generated successfully');