'use strict';

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

function parseWorkshopPublishData(text) {
  const sourceFolder = String(text).match(/"source_folder"\s+"([^"]+)"/)?.[1]?.trim() || '';
  const publishTime = String(text).match(/"publish_time"\s+"(\d+)"/)?.[1] || '';
  if (!sourceFolder) return null;
  return { sourceFolder, publishTime };
}

function defaultWorkshopRoots() {
  const home = os.homedir();
  return [
    process.env.DOTA_WORKSHOP_DIR,
    path.join(home, '.local', 'share', 'Steam', 'steamapps', 'workshop', 'content', '570'),
    path.join(home, '.steam', 'steam', 'steamapps', 'workshop', 'content', '570'),
  ].filter(Boolean);
}

function resolveLocalWorkshopMetadata(customGameId, roots = defaultWorkshopRoots()) {
  const id = String(customGameId || '').trim();
  if (!/^\d+$/.test(id)) return null;

  for (const root of [...new Set(roots)]) {
    const file = path.join(root, id, 'publish_data.txt');
    try {
      const metadata = parseWorkshopPublishData(fs.readFileSync(file, 'utf8'));
      if (metadata) return { ...metadata, file };
    } catch (err) {
      if (err.code !== 'ENOENT' && err.code !== 'ENOTDIR') {
        console.warn(`warn: could not read Workshop metadata ${file}: ${err.message}`);
      }
    }
  }
  return null;
}

module.exports = {
  parseWorkshopPublishData,
  resolveLocalWorkshopMetadata,
};