/** Convert the shipped .font files into a JS module the app can embed. */
import { readFileSync, writeFileSync, readdirSync } from 'node:fs';
import { fileURLToPath } from 'node:url';
import { dirname, join } from 'node:path';
import { parseFont, fontToJSON } from '../src/codec/bitfont.mjs';

const here = dirname(fileURLToPath(import.meta.url));
const srcDir = join(here, '../../yutongapp');
const outFile = join(here, '../src/fonts.js');

const fonts = {};
for (const f of readdirSync(srcDir).filter((f) => f.endsWith('.font')).sort()) {
  const parsed = parseFont(readFileSync(join(srcDir, f), 'latin1'));
  fonts[parsed.name] = fontToJSON(parsed);
  const codes = [...parsed.glyphs.keys()];
  console.log(
    `${parsed.name.padEnd(9)} cell ${String(parsed.cellWidth).padStart(2)}x${parsed.height}` +
    `  ${String(parsed.glyphs.size).padStart(3)} glyphs  codes ${Math.min(...codes)}..${Math.max(...codes)}`
  );
}

writeFileSync(outFile,
  '// Generated by tools/build-fonts.mjs from the .font files shipped with TP5.\n' +
  '// Each glyph is [advance, ...rows]; rows are MSB-first, cellWidth bits wide.\n' +
  'export const FONTS = ' + JSON.stringify(fonts) + ';\n');

const kb = (readFileSync(outFile).length / 1024).toFixed(0);
console.log(`\nwrote ${outFile} (${kb} KB, ${Object.keys(fonts).length} fonts)`);