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

const rootDir = path.resolve(__dirname, '..');
const backupDir = path.join(rootDir, 'src', 'db', 'pb_data_backup');
const targetDir = path.join(rootDir, 'src', 'db', 'pb_data');
const forceReset = process.argv.includes('--reset');

const filesToCopy = ['data.db', 'logs.db'];
const transientFiles = ['data.db-shm', 'data.db-wal', 'logs.db-shm', 'logs.db-wal'];

function exists(filePath) {
  return fs.existsSync(filePath);
}

function ensureDir(dirPath) {
  fs.mkdirSync(dirPath, { recursive: true });
}

function copyFile(source, target) {
  fs.copyFileSync(source, target);
}

function removeIfExists(filePath) {
  if (exists(filePath)) fs.unlinkSync(filePath);
}

function bootstrap() {
  ensureDir(targetDir);

  if (forceReset) {
    filesToCopy.concat(transientFiles).forEach((name) => removeIfExists(path.join(targetDir, name)));
  }

  filesToCopy.forEach((fileName) => {
    const sourcePath = path.join(backupDir, fileName);
    const targetPath = path.join(targetDir, fileName);

    if (!exists(sourcePath)) {
      throw new Error(`Backup manquant: ${sourcePath}`);
    }

    if (!exists(targetPath) || forceReset) {
      copyFile(sourcePath, targetPath);
      process.stdout.write(`copied ${fileName}\n`);
    } else {
      process.stdout.write(`kept ${fileName}\n`);
    }
  });

  process.stdout.write(`PocketBase bootstrap terminé (${forceReset ? 'reset' : 'safe'})\n`);
}

try {
  bootstrap();
} catch (error) {
  process.stderr.write(`db-bootstrap-local error: ${error.message}\n`);
  process.exit(1);
}