import { Workflow, Decider } from 'simple-swf/build/src/entities';
import { DecisionTask } from 'simple-swf/build/src/tasks';

import { Config } from '../../Config';
import { ActivityRegistry } from '../activity';
import { Logger } from '../../lib';

export class BaseDecider extends Decider {
  FTLConfig: Config;
  activities: ActivityRegistry;
  logger: Logger;

  constructor(config: Config, workflow: Workflow) {
    super(workflow);
    this.FTLConfig = config;
    this.activities = config.activities;
    this.logger = config.logger;
  }

  makeDecisions(task: DecisionTask, cb: {(err: Error, decision: DecisionTask)}) {
    throw new Error('must implement');
  }

  static validateTask(parameters: any): string | null {
    throw new Error('validateTask must be overriden');
  }

  static getChildren(paramenters: any): any[] | any {
    throw new Error('getChildren must be overriden');
  }

  // we return an empty string here as we need the method, but we want to try our default implentation
  static getHandlerName(): string {
    return '';
  }
}