const fs = require('fs');
const path = require('path');

let sharp;
try {
  sharp = require('sharp');
} catch (error) {
  console.error('Missing dependency: sharp. Run pnpm install first.');
  process.exit(1);
}

const appSvgPath = path.join(__dirname, '../public/favicon.svg');
const traySvgPath = path.join(__dirname, '../public/tray-icon.svg');
const iconsDir = path.join(__dirname, '../public/icons');
const buildDir = path.join(__dirname, '../build');
const docsDir = path.join(__dirname, '../../docs');

const iconSizes = [16, 24, 32, 48, 64, 128, 256, 512];
const trayIcons = [
  { name: 'tray-icon.png', size: 32 },
  { name: 'tray-icon@2x.png', size: 64 },
];

async function renderPng(sourceBuffer, targetPath, size) {
  await sharp(sourceBuffer)
    .resize(size, size, {
      fit: 'contain',
      kernel: sharp.kernel.lanczos3,
    })
    .png({
      compressionLevel: 9,
      adaptiveFiltering: true,
      palette: size <= 64,
    })
    .toFile(targetPath);
}

async function generateIcons() {
  if (!fs.existsSync(appSvgPath)) {
    throw new Error(`App icon SVG not found: ${appSvgPath}`);
  }
  if (!fs.existsSync(traySvgPath)) {
    throw new Error(`Tray icon SVG not found: ${traySvgPath}`);
  }

  fs.mkdirSync(iconsDir, { recursive: true });
  fs.mkdirSync(buildDir, { recursive: true });
  fs.mkdirSync(docsDir, { recursive: true });

  const appSvg = fs.readFileSync(appSvgPath);
  const traySvg = fs.readFileSync(traySvgPath);

  for (const size of iconSizes) {
    const target = path.join(iconsDir, `icon-${size}.png`);
    await renderPng(appSvg, target, size);
    console.log(`generated icon-${size}.png`);
  }

  for (const tray of trayIcons) {
    const target = path.join(iconsDir, tray.name);
    await renderPng(traySvg, target, tray.size);
    console.log(`generated ${tray.name}`);
  }

  const logoPath = path.join(iconsDir, 'logo.png');
  await renderPng(appSvg, logoPath, 512);

  fs.copyFileSync(path.join(iconsDir, 'icon-256.png'), path.join(buildDir, 'icon.png'));
  fs.copyFileSync(logoPath, path.join(docsDir, 'logo.png'));

  console.log('icon generation complete');
}

generateIcons().catch((error) => {
  console.error(error);
  process.exit(1);
});