// Generates every app/website/Android icon asset from the two master SVGs:
//   scripts/icon/icon.svg            — full design (navy bg + gold frame + fanned cards)
//   scripts/icon/icon-foreground.svg — cards only, transparent (Android adaptive foreground)
// Run: node scripts/icon/gen-icons.mjs
import sharp from "sharp";
import fs from "node:fs";
import path from "node:path";
import { fileURLToPath } from "node:url";

const here = path.dirname(fileURLToPath(import.meta.url));
const root = path.resolve(here, "..", "..");
const fullSvg = fs.readFileSync(path.join(here, "icon.svg"));
const fgSvg = fs.readFileSync(path.join(here, "icon-foreground.svg"));

const R = (p) => path.join(root, p);
const ensure = (p) => fs.mkdirSync(path.dirname(p), { recursive: true });

async function png(svg, size) {
  return sharp(svg, { density: 384 }).resize(size, size, { fit: "contain", background: { r: 0, g: 0, b: 0, alpha: 0 } }).png().toBuffer();
}
async function write(svg, size, dest) {
  ensure(R(dest));
  fs.writeFileSync(R(dest), await png(svg, size));
  console.log("  ", dest, `(${size})`);
}

// PNG-in-ICO container (16/32/48), accepted by all modern browsers.
function buildIco(entries) {
  const header = Buffer.alloc(6);
  header.writeUInt16LE(0, 0); header.writeUInt16LE(1, 2); header.writeUInt16LE(entries.length, 4);
  const dir = Buffer.alloc(16 * entries.length);
  let offset = 6 + 16 * entries.length;
  entries.forEach((e, i) => {
    const b = i * 16;
    dir.writeUInt8(e.size >= 256 ? 0 : e.size, b);
    dir.writeUInt8(e.size >= 256 ? 0 : e.size, b + 1);
    dir.writeUInt16LE(1, b + 4); dir.writeUInt16LE(32, b + 6);
    dir.writeUInt32LE(e.buf.length, b + 8); dir.writeUInt32LE(offset, b + 12);
    offset += e.buf.length;
  });
  return Buffer.concat([header, dir, ...entries.map((e) => e.buf)]);
}

const ANDROID = [
  ["mipmap-mdpi", 48, 108],
  ["mipmap-hdpi", 72, 162],
  ["mipmap-xhdpi", 96, 216],
  ["mipmap-xxhdpi", 144, 324],
  ["mipmap-xxxhdpi", 192, 432],
];

async function run() {
  console.log("Web / PWA:");
  // public/icon.svg = the vector master (manifest references it)
  fs.copyFileSync(path.join(here, "icon.svg"), R("public/icon.svg"));
  console.log("   public/icon.svg (vector)");
  await write(fullSvg, 192, "public/icon-192.png");
  await write(fullSvg, 512, "public/icon-512.png");
  await write(fullSvg, 512, "public/icon-maskable.png");
  await write(fullSvg, 180, "public/apple-touch-icon.png");
  await write(fullSvg, 180, "src/app/apple-icon.png");

  // favicon.ico (16/32/48)
  const ico = buildIco(await Promise.all([16, 32, 48].map(async (s) => ({ size: s, buf: await png(fullSvg, s) }))));
  ensure(R("src/app/favicon.ico"));
  fs.writeFileSync(R("src/app/favicon.ico"), ico);
  console.log("   src/app/favicon.ico (16/32/48)");

  console.log("Android (Capacitor):");
  for (const [dir, launcher, fg] of ANDROID) {
    await write(fullSvg, launcher, `android/app/src/main/res/${dir}/ic_launcher.png`);
    await write(fullSvg, launcher, `android/app/src/main/res/${dir}/ic_launcher_round.png`);
    await write(fgSvg, fg, `android/app/src/main/res/${dir}/ic_launcher_foreground.png`);
  }
  await write(fullSvg, 512, "android/app/src/main/ic_launcher-playstore.png");

  console.log("Done.");
}
run().catch((e) => { console.error(e); process.exit(1); });