// Icon list tooling.
//
//   npm run icons                     print the exhaustive list as Markdown
//   npm run icons -- --write          refresh the list inside README.md
//   npm run icons -- --manifest       print a theme.json "assets" skeleton (every key -> img/<key>.svg)

import { readFileSync, writeFileSync } from 'node:fs';
import { fileURLToPath } from 'node:url';
import { assetsSkeleton, renderMarkdown } from './icon-keys.js';
import { loadContext } from './context.js';

export const README = fileURLToPath(new URL('../README.md', import.meta.url));
export const START = '<!-- icons:start (generated by `npm run icons -- --write`, do not edit by hand) -->';
export const END = '<!-- icons:end -->';

/** README text with the generated list refreshed between the markers. */
export function withIconList(readme, ctx) {
  const start = readme.indexOf(START);
  const end = readme.indexOf(END);
  if (start < 0 || end < start) throw new Error('README.md has no icon list markers');
  return `${readme.slice(0, start + START.length)}\n\n${renderMarkdown(ctx)}\n\n${readme.slice(end)}`;
}

if (process.argv[1] === fileURLToPath(import.meta.url)) {
  const ctx = loadContext();
  const args = process.argv.slice(2);
  if (args.includes('--write')) {
    writeFileSync(README, withIconList(readFileSync(README, 'utf8'), ctx));
    console.log('README.md updated');
  } else if (args.includes('--manifest')) {
    console.log(JSON.stringify({ assets: assetsSkeleton(ctx) }, null, 2));
  } else {
    console.log(renderMarkdown(ctx));
  }
}