import { Datasource, DatasourceConnector } from '../metrics/metric';
import { connectorFactory } from '../metrics/metrics_factory';


export class QueryConfig {
  datasource: Datasource;
  // TODO: Target type (depends on datasource type)
  targets: any[];
  private _datasourceConnector?: DatasourceConnector;

  constructor(datasource: Datasource, targets: any[]) {
    if(datasource === undefined) {
      throw new Error('datasource is undefined');
    }
    if(targets === undefined) {
      throw new Error('targets is undefined');
    }
    this.datasource = datasource;
    this.targets = targets;
  }

  get datasourceConnector(): DatasourceConnector {
    if(this._datasourceConnector === undefined) {
      this._datasourceConnector = connectorFactory(this);
    }
    return this._datasourceConnector;
  }

  public toObject() {
    return {
      datasource: this.datasource,
      targets: this.targets,
    };
  }

  static fromObject(obj: any): QueryConfig {
    if(obj === undefined) {
      throw new Error('obj is undefined');
    }
    return new QueryConfig(
      obj.datasource,
      obj.targets,
    );
  }
}