import {EventEmitter, Injectable} from '@angular/core';
import {ChallengeService} from './challenge.service';
import {filter} from 'rxjs/operators';
import {MicroLessonMetricsService} from './metrics/micro-lesson-metrics.service';
import {ScreenTypeOx, SurpriseInfo} from 'ox-types';

@Injectable({
  providedIn: 'root'
})
export class SurpriseService {
  // This is per exercise.
  private currentSurprisesUsed: SurpriseInfo[];
  surprise: EventEmitter<SurpriseInfo>;

  constructor(private challengeService: ChallengeService<any, any>,
              private metricsService: MicroLessonMetricsService<any>) {
    this.currentSurprisesUsed = [];
    this.surprise = new EventEmitter();
    this.challengeService.currentExercise.pipe(filter(x => x !== undefined))
      .subscribe(x => this.currentSurprisesUsed = []);
  }

  onSurpriseUsed(surpriseName: string, fromScreen: ScreenTypeOx, eventType: 'start' | 'end') {
    if (eventType === 'start') {
      const current = this.currentSurprisesUsed.find(x => x.surpriseName === surpriseName);
      if (current) {
        current.uses++;
        this.sendSurpriseUseToWumbox(current);
      } else {
        const info: SurpriseInfo = {surpriseName, uses: 1, fromScreen, eventType};
        this.currentSurprisesUsed.push(info);
        this.sendSurpriseUseToWumbox(info);
      }
      if (fromScreen === ScreenTypeOx.Game) {
        console.log('TODO FIX SURPRISE SERVICE');
        console.log('TODO FIX SURPRISE SERVICE');
        console.log('TODO FIX SURPRISE SERVICE');
        // this.metricsService.updateSurpriseMetric(this.currentSurprisesUsed);
      }
    } else {
      this.sendSurpriseUseToWumbox({surpriseName, fromScreen, eventType});
    }
  }

  private sendSurpriseUseToWumbox(info: SurpriseInfo) {
    this.surprise.emit(info);
  }
}