/**
 * Renders the Freezmo app icons (PWA + iOS) from the master artwork with
 * headless Chromium.
 * Run: node scripts/make-icons.mjs  (requires a Playwright Chromium cache)
 *
 * Master: assets/app-icon-source.jpeg — a 1024x1024 navy rounded square.
 *   1. The master is masked at full resolution first (a rounded rect 4px
 *      inside the artwork's own corner radius), so the JPEG's anti-aliased
 *      white edge never survives and small sizes downscale with clean alpha.
 *   2. "any" icons use that masked master as-is.
 *      Apple touch icons are full-bleed, because iOS paints transparency
 *      black; the artwork is zoomed 20% so its corners fall outside the
 *      square (the master's corners are ~85px, so nothing else is cropped).
 *      The maskable icon keeps the artwork inside the 80% safe circle on a
 *      matching navy field.
 * Also writes app/favicon.ico, the Next.js file convention for the browser
 * tab (the larger sizes are declared in app/layout.tsx metadata).
 */
import { chromium } from "playwright-core";
import { mkdirSync, existsSync, readFileSync, writeFileSync } from "node:fs";

const CHROME = process.env.CHROME ?? "/home/martin/.cache/ms-playwright/chromium-1243/chrome-linux64/chrome";
const ROOT = new URL("../", import.meta.url).pathname;
const OUT = `${ROOT}public/icons/`;
const SOURCE = `${ROOT}assets/app-icon-source.jpeg`;
mkdirSync(OUT, { recursive: true });

/** Sampled from the master artwork: background colour, size, corner radius. */
const NAVY = "#101528";
const SIZE = 1024;
const CORNER = 253;
const ERODE = 4; // keeps the clip inside the artwork's anti-aliased edge

const sourceUri = `data:image/jpeg;base64,${readFileSync(SOURCE).toString("base64")}`;

const browser = await chromium.launch({ executablePath: CHROME, args: ["--no-sandbox"] });

/* Stage 1: mask the master at full resolution. */
const masterHtml = `<!doctype html><html><head><meta charset="utf-8"><style>
  html,body{margin:0;padding:0;overflow:hidden;background:transparent}
</style></head><body>
<svg width="${SIZE}" height="${SIZE}" viewBox="0 0 ${SIZE} ${SIZE}" xmlns="http://www.w3.org/2000/svg">
  <defs>
    <clipPath id="round">
      <rect x="${ERODE}" y="${ERODE}" width="${SIZE - ERODE * 2}" height="${SIZE - ERODE * 2}" rx="${CORNER - ERODE}"/>
    </clipPath>
  </defs>
  <image href="${sourceUri}" x="0" y="0" width="${SIZE}" height="${SIZE}" clip-path="url(#round)"/>
</svg></body></html>`;
const masterPage = await browser.newPage({ viewport: { width: SIZE, height: SIZE }, deviceScaleFactor: 1 });
await masterPage.setContent(masterHtml, { waitUntil: "load" });
const master = await masterPage.screenshot({ omitBackground: true });
await masterPage.close();
const masterUri = `data:image/png;base64,${master.toString("base64")}`;

/* Stage 2: render each target from the masked master. */
function pageHtml(size, mode) {
  const img = mode === "bleed" ? sourceUri : masterUri;
  return `<!doctype html><html><head><meta charset="utf-8"><style>
    html,body{margin:0;padding:0;overflow:hidden;background:transparent}
    .icon{width:${size}px;height:${size}px;overflow:hidden}
    .icon img{display:block;width:100%;height:100%}
    .bleed img{transform:scale(1.2)}
    .maskable{background:${NAVY};display:grid;place-items:center}
    .maskable img{width:80%;height:80%}
  </style></head><body><div class="icon ${mode}"><img src="${img}" alt=""></div></body></html>`;
}

const targets = [
  // Standard PWA icons: the artwork's rounded square, transparent outside
  { file: "icon-192.png", size: 192, mode: "rounded" },
  { file: "icon-512.png", size: 512, mode: "rounded" },
  // Maskable: full-bleed navy field, artwork inside the safe circle
  { file: "maskable-512.png", size: 512, mode: "maskable" },
  // iOS home screen: square, the OS applies its own mask
  { file: "apple-touch-icon.png", size: 180, mode: "bleed" },
  { file: "apple-touch-icon-167.png", size: 167, mode: "bleed" },
  { file: "apple-touch-icon-152.png", size: 152, mode: "bleed" },
  // Browser tab
  { file: "favicon-32.png", size: 32, mode: "rounded" },
];

for (const target of targets) {
  const page = await browser.newPage({ viewport: { width: target.size, height: target.size }, deviceScaleFactor: 1 });
  await page.setContent(pageHtml(target.size, target.mode), { waitUntil: "load" });
  await page.screenshot({ path: `${OUT}${target.file}`, omitBackground: true });
  await page.close();
  console.log(`  ✓ ${target.file}`);
}

/* Next.js file convention: /favicon.ico is the browser-tab icon (the other
   sizes live in public/icons and are declared in app/layout.tsx metadata).
   The ICO is a PNG payload in an ICO container, which every browser of
   consequence reads. */
const favicon = readFileSync(`${OUT}favicon-32.png`);
const header = Buffer.alloc(6);
header.writeUInt16LE(0, 0); // reserved
header.writeUInt16LE(1, 2); // type: icon
header.writeUInt16LE(1, 4); // image count
const entry = Buffer.alloc(16);
entry.writeUInt8(32, 0); // width
entry.writeUInt8(32, 1); // height
entry.writeUInt16LE(1, 4); // colour planes
entry.writeUInt16LE(32, 6); // bits per pixel
entry.writeUInt32LE(favicon.length, 8);
entry.writeUInt32LE(22, 12); // payload offset
writeFileSync(`${ROOT}app/favicon.ico`, Buffer.concat([header, entry, favicon]));
console.log("  ✓ app/favicon.ico");

/* iOS splash screens: a light stage with the new mark and the wordmark. */
const badgeUri = `data:image/png;base64,${readFileSync(`${OUT}icon-192.png`).toString("base64")}`;
const splash = `<!doctype html><html><head><meta charset="utf-8"><style>
  html,body{margin:0;height:100%;background:linear-gradient(180deg,#fbfcfd,#f1f5f9);
  display:grid;place-items:center;font-family:-apple-system,system-ui,sans-serif}
  .mark{display:grid;gap:14px;justify-items:center}
  .badge{width:96px;height:96px;border-radius:24px;box-shadow:0 10px 24px -12px rgb(16 21 40 / .5)}
  .name{font-size:22px;font-weight:600;color:#26323b;letter-spacing:-.01em}
</style></head><body><div class="mark"><img class="badge" src="${badgeUri}" alt=""><div class="name">Freezmo</div></div></body></html>`;

const splashTargets = [
  [1170, 2532], [1284, 2778], [1179, 2556], [1290, 2796], [750, 1334], [828, 1792], [1536, 2048], [1668, 2388],
];
for (const [width, height] of splashTargets) {
  const page = await browser.newPage({ viewport: { width, height }, deviceScaleFactor: 1 });
  await page.setContent(splash, { waitUntil: "load" });
  await page.screenshot({ path: `${OUT}splash-${width}x${height}.png` });
  await page.close();
  console.log(`  ✓ splash-${width}x${height}.png`);
}

await browser.close();
if (!existsSync(`${OUT}icon-512.png`)) process.exit(1);
console.log("icons written to public/icons/");