// One-off generator for the Minstrel OG / share-preview placeholder.
// Run with: cd tools && npm install && npm run gen-og-placeholder
//
// Produces ../web/static/brand/og-image.png at 1200x630, the standard
// OpenGraph aspect. The artwork is intentionally minimal — operators
// are encouraged to drop a hand-designed PNG over the same path; no
// code change is required to swap.
import sharp from 'sharp';
import { mkdir } from 'node:fs/promises';
import { resolve, dirname } from 'node:path';
import { fileURLToPath } from 'node:url';

const __dirname = dirname(fileURLToPath(import.meta.url));
const outPath = resolve(__dirname, '../web/static/brand/og-image.png');

const W = 1200;
const H = 630;
const OBSIDIAN = '#14171A';
const PARCHMENT = '#E8E4D8';
const ACCENT = '#4A6B5C';

const svg = `
<svg xmlns="http://www.w3.org/2000/svg" width="${W}" height="${H}" viewBox="0 0 ${W} ${H}">
  <rect width="100%" height="100%" fill="${OBSIDIAN}"/>
  <text x="50%" y="48%" text-anchor="middle"
        font-family="Georgia, 'Fraunces', serif"
        font-size="148" font-weight="500" fill="${PARCHMENT}"
        letter-spacing="2">Minstrel</text>
  <line x1="42%" y1="58%" x2="58%" y2="58%"
        stroke="${ACCENT}" stroke-width="3" stroke-linecap="round"/>
  <text x="50%" y="68%" text-anchor="middle"
        font-family="Inter, system-ui, sans-serif"
        font-size="28" fill="${PARCHMENT}" opacity="0.8">
    Self-hosted music server
  </text>
</svg>
`;

await mkdir(dirname(outPath), { recursive: true });
await sharp(Buffer.from(svg))
  .png({ compressionLevel: 9 })
  .toFile(outPath);

console.log(`wrote ${outPath}`);