// Scenario/bundle/curriculum-path loading — same source files and cache pattern as
// backend/server.js (scenarios/data, scenarios/bundles, scenarios/rootnode-path.json). The
// Platform API only ever READS this content for listing/progress-shaping purposes; it never
// executes setup/validate/teardown commands — that stays exclusively the Lab image's job.

const fs = require('fs');
const path = require('path');

const SCENARIOS_DIR = process.env.SCENARIOS_DIR || path.join(__dirname, '../scenarios/data');
const BUNDLES_DIR = process.env.BUNDLES_DIR || path.join(__dirname, '../scenarios/bundles');
const CURRICULUM_PATH_FILE = process.env.CURRICULUM_PATH_FILE || path.join(__dirname, '../scenarios/rootnode-path.json');

function loadJsonDir(dir) {
  return fs.readdirSync(dir).filter((f) => f.endsWith('.json'))
    .map((f) => JSON.parse(fs.readFileSync(path.join(dir, f), 'utf8')));
}

let scenariosCache = [];
let bundlesCache = [];
let curriculumPathCache = null;

function reloadCache() {
  scenariosCache = loadJsonDir(SCENARIOS_DIR);
  bundlesCache = loadJsonDir(BUNDLES_DIR);
  curriculumPathCache = fs.existsSync(CURRICULUM_PATH_FILE)
    ? JSON.parse(fs.readFileSync(CURRICULUM_PATH_FILE, 'utf8'))
    : null;
  console.log(`Loaded ${scenariosCache.length} scenarios and ${bundlesCache.length} bundles into cache.`);
}
reloadCache();

module.exports = {
  reloadCache,
  loadScenarios: () => scenariosCache,
  loadBundles: () => bundlesCache,
  loadCurriculumPath: () => curriculumPathCache,
};