/**
 * Génère le favicon et les icônes à partir du logo (spirale dorée), jamais
 * d'icône générique. Usage : pnpm icons
 */
import { writeFileSync, mkdirSync } from "node:fs";
import sharp from "sharp";
import { buildSpiral } from "../src/lib/spiral.ts";

const { squares, path, bbox } = buildSpiral(8);
const pad = 1.2;
const vb = `${bbox.x - pad} ${bbox.y - pad} ${bbox.w + pad * 2} ${bbox.h + pad * 2}`;
const gold = "#c7a075";
const ivory = "#f5eee4";

function svg({ background, size }: { background: boolean; size?: number }) {
  const rects = squares
    .map(
      (s) =>
        `<rect x="${s.x}" y="${s.y}" width="${s.s}" height="${s.s}" stroke-width="${background ? 0.32 : 0.14}" opacity="0.8"/>`,
    )
    .join("");
  const dim = size ? ` width="${size}" height="${size}"` : "";
  // Le rectangle d'or est 34×21 : on le centre dans un carré pour l'icône.
  const side = Math.max(bbox.w, bbox.h) + pad * 2;
  const sq = `${bbox.x + bbox.w / 2 - side / 2} ${bbox.y + bbox.h / 2 - side / 2} ${side} ${side}`;
  return `<svg xmlns="http://www.w3.org/2000/svg" viewBox="${background ? sq : vb}"${dim}>
${background ? `<rect x="${bbox.x + bbox.w / 2 - side / 2}" y="${bbox.y + bbox.h / 2 - side / 2}" width="${side}" height="${side}" rx="${side * 0.2}" fill="${ivory}"/>` : ""}
<g fill="none" stroke="${gold}" stroke-width="${background ? 0.55 : 0.22}" stroke-linecap="round">${rects}<path d="${path}" stroke="${background ? "#b48a5a" : gold}"/></g>
</svg>`;
}

mkdirSync("src/app", { recursive: true });
mkdirSync("public", { recursive: true });
writeFileSync("src/app/icon.svg", svg({ background: true }));
writeFileSync("public/logo-mark.svg", svg({ background: false }));

const png = (s: number) => sharp(Buffer.from(svg({ background: true, size: s }))).png();
await png(180).toFile("src/app/apple-icon.png");
await png(512).toFile("public/icon-512.png");
await png(192).toFile("public/icon-192.png");
// favicon.ico : PNG 48 px encapsulé (format accepté par les navigateurs modernes)
const p48 = await png(48).toBuffer();
const ico = Buffer.alloc(6 + 16);
ico.writeUInt16LE(0, 0);
ico.writeUInt16LE(1, 2);
ico.writeUInt16LE(1, 4);
ico.writeUInt8(48, 6);
ico.writeUInt8(48, 7);
ico.writeUInt8(0, 8);
ico.writeUInt8(0, 9);
ico.writeUInt16LE(1, 10);
ico.writeUInt16LE(32, 12);
ico.writeUInt32LE(p48.length, 14);
ico.writeUInt32LE(22, 18);
writeFileSync("src/app/favicon.ico", Buffer.concat([ico, p48]));
console.log(
  "Icônes générées : src/app/icon.svg, favicon.ico, apple-icon.png, public/icon-*.png, public/logo-mark.svg",
);