/**
 * BackupProvider — Abstract base class for backup providers
 * All providers must implement these methods
 */

class BackupProvider {
  /**
   * Authenticate with the backup service
   * @param {Object} credentials - Provider-specific credentials
   */
  async authenticate(credentials) {
    throw new Error('authenticate() not implemented in ' + this.constructor.name)
  }

  /**
   * Upload a backup file
   * @param {Buffer} buffer - File content
   * @param {string} filename - Filename (e.g., 'repo-backup-2025-03-24.zip')
   * @returns {Promise<{size: number}>}
   */
  async uploadBackup(buffer, filename) {
    throw new Error('uploadBackup() not implemented in ' + this.constructor.name)
  }

  /**
   * List all backups for a repository
   * @returns {Promise<Array>} Array of {name, size, date}
   */
  async listBackups() {
    throw new Error('listBackups() not implemented in ' + this.constructor.name)
  }

  /**
   * Download a specific backup
   * @param {string} filename - Filename to download
   * @returns {Promise<Buffer>}
   */
  async downloadBackup(filename) {
    throw new Error('downloadBackup() not implemented in ' + this.constructor.name)
  }

  /**
   * Delete a backup file
   * @param {string} filename - Filename to delete
   */
  async deleteBackup(filename) {
    throw new Error('deleteBackup() not implemented in ' + this.constructor.name)
  }

  /**
   * Test connection to backup service
   * @returns {Promise<{ok: boolean, error?: string}>}
   */
  async testConnection() {
    throw new Error('testConnection() not implemented in ' + this.constructor.name)
  }
}

module.exports = BackupProvider