// Refuse damaged history before Pi's --continue can silently skip it.
import { readFileSync, lstatSync } from 'node:fs';

try {
  for (const file of process.argv.slice(2)) {
    if (!lstatSync(file).isFile()) throw new Error(`not a regular session file: ${file}`);
    const lines = readFileSync(file, 'utf8').trim().split('\n');
    const entries = lines.map((line) => JSON.parse(line));
    const header = entries[0];
    if (header?.type !== 'session' || typeof header.id !== 'string' || !header.id ||
        typeof header.version !== 'number' || typeof header.cwd !== 'string' ||
        !Number.isFinite(Date.parse(header.timestamp)) ||
        entries.slice(1).some((entry) => !entry || typeof entry.type !== 'string')) {
      throw new Error(`invalid session structure: ${file}`);
    }
    if (header.cwd !== process.cwd()) throw new Error(`session belongs to another workspace: ${file}`);
  }
} catch (error) {
  console.error(`dewey: cannot safely resume: ${error.message}; inspect history or explicitly use --fresh`);
  process.exit(1);
}