import { BaseMigration } from './base-migration.ts';
import { logger } from '../logger.ts';

/**
 * Migration from v3 (upsList) to v4 (upsDevices)
 *
 * Detects v3 format:
 * {
 *   upsList: [ ... ],
 *   groups: [ ... ],
 *   checkInterval: 30000
 * }
 *
 * Converts to:
 * {
 *   version: "4.0",
 *   upsDevices: [ ... ],  // renamed from upsList
 *   groups: [ ... ],
 *   checkInterval: 30000
 * }
 */
export class MigrationV3ToV4 extends BaseMigration {
  readonly order = 4;
  readonly fromVersion = '3.x';
  readonly toVersion = '4.0';

  async shouldRun(config: any): Promise<boolean> {
    // V3 format has upsList instead of upsDevices
    return !!config.upsList && !config.upsDevices;
  }

  async migrate(config: any): Promise<any> {
    logger.info(`${this.getName()}: Renaming upsList to upsDevices...`);

    const migrated = {
      version: this.toVersion,
      upsDevices: config.upsList,  // Rename upsList → upsDevices
      groups: config.groups || [],
      checkInterval: config.checkInterval || 30000,
    };

    logger.success(`${this.getName()}: Migration complete`);
    return migrated;
  }
}