import { copyFileSync, mkdirSync, readFileSync, writeFileSync } from 'node:fs';
import path from 'node:path';

const sourceRoot = process.argv[2];
if (!sourceRoot) {
	throw new Error('Usage: node scripts/generate-classic-regular-icons.mjs <font-awesome-web-root>');
}

const javascript = readFileSync(path.join(sourceRoot, 'js', 'regular.js'), 'utf8');
const metadata = JSON.parse(readFileSync(path.join(sourceRoot, 'metadata', 'icons.json'), 'utf8'));
const start = javascript.indexOf('  var icons = ') + '  var icons = '.length;
const end = javascript.indexOf('\n  };', start) + '\n  }'.length;
if (start < '  var icons = '.length || end < start)
	throw new Error('Classic Regular icons not found');

const definitions = JSON.parse(javascript.slice(start, end));
const icons = Object.keys(definitions)
	.map((name) => {
		const details = metadata[name];
		return {
			name,
			label: details?.label ?? name.replaceAll('-', ' '),
			terms: details?.search?.terms ?? []
		};
	})
	.sort((left, right) => left.label.localeCompare(right.label, 'en'));

const output = `// Generated from Font Awesome Pro Plus 7.0.0 Classic Regular metadata.
// Covered by the Font Awesome Pro commercial license; see THIRD_PARTY_NOTICES.md.
export type ClassicRegularIcon = {
\tname: string;
\tlabel: string;
\tterms: readonly string[];
};

export const classicRegularIcons: readonly ClassicRegularIcon[] = ${JSON.stringify(icons)};

export type IconName = string;

export const classicRegularIconNames = new Set<string>(
	classicRegularIcons.map((icon) => icon.name)
);
`;

writeFileSync('src/lib/icons/classic-regular.ts', output);
mkdirSync('static/icons', { recursive: true });
copyFileSync(
	path.join(sourceRoot, 'sprites-full', 'regular.svg'),
	'static/icons/classic-regular.svg'
);
console.log(`Generated ${icons.length} Classic Regular icons.`);