import { NgxLoggerService } from '@allianz/ngx-logger';
import { Injectable } from '@angular/core';
import { PfeNavigationUtilService } from '../../services/pfe-navigation-service/navigation-util.service';
import { PFE_HISTORY_KEY } from '../../services/pfe-state-service/pfe-state-keys';
import { PfeStateService } from '../../services/pfe-state-service/state.service';
import { PfeRewindHistory, RewindHistoryActionConfig } from './rewind-history.model';

@Injectable()
export class PfeRewindHistoryService {
  constructor(
    private pfeStateService: PfeStateService,
    private pfeNavigationUtilService: PfeNavigationUtilService,
    private logger: NgxLoggerService
  ) {}

  public rewindHistory = async (actionConfig: RewindHistoryActionConfig): Promise<void> => {
    if (actionConfig?.clearHistory) {
      this.pfeStateService.storeValue(PFE_HISTORY_KEY, []);
      return;
    }

    const pageId = actionConfig?.pageId
      ? this.pfeStateService.getStateValueByExpression(actionConfig?.pageId)
      : this.pfeNavigationUtilService.currentPageId$.value;

    const pfeHistory: string[] = this.pfeStateService.getValue(PFE_HISTORY_KEY) as string[];
    if (!pfeHistory) {
      return;
    }

    let index = pfeHistory.findIndex((value) => value === pageId);

    if (index < 0) {
      this.logger.warnToServer(
        `${PfeRewindHistory}: Unable to find index of page "${pageId}", that was supposed to be used in the rewind.`
      );
      return;
    }

    if (actionConfig?.keepSelf) {
      index++;
    }

    const newPfeHistory = pfeHistory.splice(0, index);

    this.pfeStateService.storeValue(PFE_HISTORY_KEY, newPfeHistory);
  };
}