import { createHash } from 'node:crypto';

export function migrationChecksum(content) {
  return createHash('sha256').update(content).digest('hex');
}

export function assertMigrationChecksum(version, expected, actual) {
  if (expected !== actual) {
    throw new Error(
      `Applied migration ${version} was modified: expected sha256 ${expected}, got ${actual}`,
    );
  }
}

export function assertAppliedMigrationsPresent(appliedVersions, availableVersions) {
  const available = new Set(availableVersions);
  for (const version of appliedVersions) {
    if (!available.has(version)) {
      throw new Error(`Applied migration ${version} is missing from the repository`);
    }
  }
}