import { HostExtractor } from '../util/HostExtractor';

export class OptimizelyService {
  private isEnabled: boolean;
  private experimentList: { id: string, name: string }[];

  constructor(private $window: OptimizelyWindow, $location: angular.ILocationService, host: HostExtractor) {
    // Query parameter to completely disable optimizely, and it's only enabled if the global var exists
    // Also disable experiments for move in, for CSA mode and for communities
    if ($location.search()['optimizely_disable'] || !$window.optimizely || !$window.optimizely.allExperiments || host.mode === 'MoveIn' || host.isAgentMode || host.retailer !== 'OVO')
      this.isEnabled = false;
    else {
      this.isEnabled = true;
      // Store the experiment map as a list so it's easier to filter by experiment name
      this.experimentList = Object.keys($window.optimizely.allExperiments).map(id => ({ id: id, name: $window.optimizely.allExperiments[id].name }));
    }
  }

  getActiveVariation(experimentName: string): string {
    if (this.isEnabled) {
      let experimentId = this.experimentList.filter(e => e.name === experimentName).map(e => e.id)[0];
      // No need to activate it if it's already in this list
      if (experimentId && this.$window.optimizely.activeExperiments.indexOf(experimentId) === -1)
        this.$window.optimizely.push(['activate', experimentId]);
      return this.$window.optimizely.variationNamesMap[experimentId] || 'Original';
    } else
      return 'Original';
  }
}

export interface Optimizely {
  activeExperiments: string[],
  allExperiments: {
    [id: string]: { name: string }
  },
  variationNamesMap: {
    [id: string]: string
  }
  push(params: string[]): void
}

export interface OptimizelyWindow extends angular.IWindowService {
  optimizely: Optimizely;
}