const fs = require('fs').promises;
const path = require('path');
const outDir = './out';

async function readAndParseJSON() {
  try {
    const files = await fs.readdir('./');

    for (const file of files) {
      const data = await fs.readFile(file, 'utf8');

      let jsonData;
      try {
        jsonData = JSON.parse(data);
        // console.log(`JSON data from ${file}:`, jsonData);
      } catch (error) {
        // console.error(`Error parsing JSON from ${file}:`, error);
      }

      const script = readPossibleScriptJSON(jsonData);
      // If script exists, write it as a txt file
      if (script) {
        let filename = `${script.id}${script.title ? `-${script.title}` : ''}`;
        // Append length to filename
        filename += `-${script.lines.length}`;
        // Replace invalid characters
        filename = filename.replace(/[\\/:*?"<>|]/g, '');
        // Create outDir if it doesn't exist
        try {
          await fs.access(outDir);
        } catch (error) {
          await fs.mkdir(outDir);
        }
        const filepath = path.join(outDir, `${filename}.txt`);
        await fs.writeFile(filepath, script.lines, 'utf8');
        console.log(`Script written to filepath: ${filepath}`);
      }
    }
  } catch (err) {
    console.error('Error reading directory:', err);
  }
}

readAndParseJSON();

/**
 * Check if it's a script, return script text if so
 * @param {*} data
 */
function readPossibleScriptJSON(data) {
  const lines = [];
  // Check if data is array
  if (!Array.isArray(data)) {
    return null;
  }
  const id = data[0][3].id;
  const title = data[0][3].title;
  for (const line of data) {
    if (line && line[3] && line[3].text) {
      lines.push(line[3].text);
    }
  }
  if (lines.length > 0) {
    return {
      id,
      title,
      lines: lines.join('\n'),
    };
  } else {
    return null;
  }
}