#!/usr/bin/env node
/**
 * Generate app icons from a single SVG source.
 *
 * Usage:
 *   npm i -D sharp
 *   node scripts/generate-icons.mjs
 *
 * Requires: public/icons/source.svg
 * Outputs into: public/icons/
 */
import { readFile, writeFile, mkdir } from "node:fs/promises";
import { fileURLToPath } from "node:url";
import { dirname, join } from "node:path";
import sharp from "sharp";

const here = dirname(fileURLToPath(import.meta.url));
const root = join(here, "..");
const iconsDir = join(root, "public", "icons");

const SOURCE = join(iconsDir, "source.svg");

const TARGETS = [
  { out: "icon-192.png", size: 192, padding: 0 },
  { out: "icon-512.png", size: 512, padding: 0 },
  { out: "icon-maskable-512.png", size: 512, padding: 64 }, // safe zone
  { out: "apple-touch-icon.png", size: 180, padding: 0 },
];

async function main() {
  await mkdir(iconsDir, { recursive: true });
  const svg = await readFile(SOURCE);

  for (const t of TARGETS) {
    const inner = t.size - t.padding * 2;
    const buf = await sharp(svg, { density: 384 })
      .resize(inner, inner, { fit: "contain", background: { r: 0, g: 0, b: 0, alpha: 0 } })
      .extend({
        top: t.padding,
        bottom: t.padding,
        left: t.padding,
        right: t.padding,
        background: { r: 0, g: 0, b: 0, alpha: 0 },
      })
      .png({ compressionLevel: 9 })
      .toBuffer();
    await writeFile(join(iconsDir, t.out), buf);
    console.log(`wrote ${t.out} (${t.size}x${t.size})`);
  }

  // simple favicon — 32x32 png renamed .ico works in modern browsers
  const faviconBuf = await sharp(svg, { density: 192 })
    .resize(32, 32, { fit: "contain", background: { r: 0, g: 0, b: 0, alpha: 0 } })
    .png()
    .toBuffer();
  await writeFile(join(iconsDir, "favicon.ico"), faviconBuf);
  console.log("wrote favicon.ico (32x32 png)");
}

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