#!/usr/bin/env node
/**
 * Simple SVG -> PNG converter using sharp.
 * Usage: node svg2png.mjs <input.svg> <output.png> <width> <height>
 */
import fs from 'node:fs/promises';
import path from 'node:path';
import sharp from 'sharp';

async function main() {
  const [,, inPath, outPath, wArg, hArg] = process.argv;
  if (!inPath || !outPath || !wArg || !hArg) {
    console.error('Usage: node svg2png.mjs <input.svg> <output.png> <width> <height>');
    process.exit(1);
  }
  const width = Number(wArg);
  const height = Number(hArg);
  if (!width || !height) {
    console.error('Width and height must be numbers');
    process.exit(1);
  }

  const absIn = path.resolve(inPath);
  const absOut = path.resolve(outPath);
  const svg = await fs.readFile(absIn);

  // Render with background white to avoid transparency issues in slides
  const png = await sharp(svg, { density: 300 })
    .resize(width, height, { fit: 'contain', background: { r: 255, g: 255, b: 255, alpha: 1 } })
    .png({ compressionLevel: 9 })
    .toBuffer();

  await fs.mkdir(path.dirname(absOut), { recursive: true });
  await fs.writeFile(absOut, png);
  console.log(`Wrote ${absOut} (${width}x${height})`);
}

main().catch((err) => {
  console.error('svg2png failed:', err?.message || err);
  process.exit(1);
});