Function importBackupFromFile

Source

export async function importBackupFromFile(file: File): Promise<BackupData> {
  try {
    console.log("[Backup] Reading backup file:", file.name);

    // Check file size against the limit
    if (file.size > MAX_BACKUP_FILE_SIZE) {
      const sizeMB = (file.size / 1024 / 1024).toFixed(2);
      const limitMB = (MAX_BACKUP_FILE_SIZE / 1024 / 1024).toFixed(0);
      throw new Error(
        `Backup file is too large (${sizeMB} MB). Maximum recommended size is ${limitMB} MB.`,
      );
    } else if (file.size > 5 * 1024 * 1024) {
      console.info(
        `[Backup] Backup file size: ${(file.size / 1024 / 1024).toFixed(2)} MB`,
      );
    }

    // Read file as text
    const fileContent = await file.text();

    // Parse JSON with error handling
    let backupData: BackupData;
    try {
      backupData = JSON.parse(fileContent);
    } catch (parseError) {
      throw new Error(
        `Invalid backup file format: ${
          parseError instanceof Error ? parseError.message : "JSON parse error"
        }`,
      );
    }

    // Validate backup structure
    const validation = validateBackup(backupData);
    if (!validation.valid) {
      throw new Error(
        `Backup validation failed: ${validation.errors.join("; ")}`,
      );
    }

    console.log("[Backup] File imported and validated successfully");
    return backupData;
  } catch (error) {
    const message = `Failed to import backup: ${
      error instanceof Error ? error.message : "Unknown error"
    }`;
    console.error("[Backup]", message);
    throw new Error(message);
  }
}
Copy