import { readFileSync } from 'node:fs';
import { fileURLToPath } from 'node:url';
import { buildContext } from '../public/js/engine/context.js';

export const PUBLIC_DIR = fileURLToPath(new URL('../public/', import.meta.url));

export const readJson = (relativePath) => JSON.parse(readFileSync(PUBLIC_DIR + relativePath, 'utf8'));

export function loadContext() {
  return buildContext({
    rules: readJson('data/rules.json'),
    generators: readJson('data/generators.json'),
    upgrades: readJson('data/upgrades.json'),
  });
}

/** Flatten nested locale JSON to dotted keys, like services/i18n.js does. */
export function flatKeys(object, prefix = '') {
  return Object.entries(object).flatMap(([key, value]) => {
    const path = prefix ? `${prefix}.${key}` : key;
    return value && typeof value === 'object' ? flatKeys(value, path) : [path];
  });
}