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

/**
 * Migration from v1 (single SNMP config) to v2 (upsDevices array)
 *
 * Detects old format:
 * {
 *   snmp: { ... },
 *   thresholds: { ... },
 *   checkInterval: 30000
 * }
 *
 * Converts to:
 * {
 *   version: "2.0",
 *   upsDevices: [{ id: "default", name: "Default UPS", snmp: ..., thresholds: ... }],
 *   groups: [],
 *   checkInterval: 30000
 * }
 */
export class MigrationV1ToV2 extends BaseMigration {
  readonly fromVersion = '1.x';
  readonly toVersion = '2.0';

  async shouldRun(config: any): Promise<boolean> {
    // V1 format has snmp field directly at root, no upsDevices or upsList
    return !!config.snmp && !config.upsDevices && !config.upsList;
  }

  async migrate(config: any): Promise<any> {
    logger.info(`${this.getName()}: Converting single SNMP config to multi-UPS format...`);

    const migrated = {
      version: this.toVersion,
      upsDevices: [
        {
          id: 'default',
          name: 'Default UPS',
          snmp: config.snmp,
          thresholds: config.thresholds || {
            battery: 60,
            runtime: 20,
          },
          groups: [],
        },
      ],
      groups: [],
      checkInterval: config.checkInterval || 30000,
    };

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