import {HttpClient} from '@angular/common/http';
import {Injectable} from '@angular/core';
import {Subject} from 'rxjs';

import {HsUtilsService} from 'hslayers-ng/components/utils/utils.service';

// import attractivity from '../Attractivity.json';
import {nuts} from '../nuts';
//import {factors} from './factors.js';

@Injectable({providedIn: 'root'})
export class AdjusterService {
  serviceBaseUrl: string;
  factors;
  clusters;
  clustersLoaded: Subject<any> = new Subject();
  method: string;
  _clusteringInProcess: boolean;

  constructor(
    private hsUtilsService: HsUtilsService,
    private httpClient: HttpClient
  ) {
    this.serviceBaseUrl =
      window.location.hostname === 'localhost'
        ? 'https://jmacura.ml/ws/' // 'http://localhost:3000/'
        : 'https://publish.lesprojekt.cz/nodejs/';
    this.factors = [];
    this.clusters = [];
    this.method = 'haclustwd2';
    this._clusteringInProcess = true;
    this.init();
  }

  /**
   * Sends a request to polirural-attractiveness-service
   * and applies the returned values
   */
  apply(): void {
    const f = () => {
      this._clusteringInProcess = true;
      this.httpClient
        .post(this.serviceBaseUrl + 'clusters', {
          factors: this.factors.map((f) => {
            return {
              factor: f.name,
              weight: f.weight,
              datasets: f.datasets
                .filter((ds) => ds.included)
                .map((ds) => ds.name),
            };
          }),
        })
        .toPromise()
        .then((data: any) => {
          const clusterData = data.response;
          /*let max = 0;
        this.clusters.forEach((a) => {
          if (a.aggregate > max) {
            max = a.aggregate;
          }
        });
        const normalizer = 1 / max;
        this.attractivity.forEach((a) => {
          a.aggregate *= normalizer;
        });
        this.attractivity.forEach((a) => {
          this.nutsCodeRecordRelations[a.code] = a;
        });*/
          nuts.nuts3Source.forEachFeature((feature) => {
            // Pair each feature with its clustering data
            const featureData = clusterData.find(
              (item) => item['nuts_id'] === feature.get('NUTS_ID')
            );
            if (!featureData) {
              console.error(`No data for feature ${feature.get('NUTS_ID')}`);
              console.log(feature);
              return;
            }
            Object.keys(featureData).forEach(function (key, index) {
              if (key !== 'nuts_id') {
                feature.set(key, featureData[key]);
              }
            });
          });
          const clusters = [];
          for (const region of clusterData) {
            if (!clusters.includes(region[this.method])) {
              clusters.push(region[this.method]);
            }
          }
          this.clusters = clusters;
          this._clusteringInProcess = false;
          this.clustersLoaded.next();
        })
        .catch((error) => {
          console.warn(`Error obtaining data from ${this.serviceBaseUrl}.`);
          console.log(error);
          this._clusteringInProcess = false;
        });
    };
    this.hsUtilsService.debounce(f, 300, false, this)();
  }

  init(): void {
    this.httpClient
      .get(this.serviceBaseUrl + 'datasets')
      .toPromise()
      .then((data: any) => {
        this.factors = data.map((dataset) => {
          return {name: dataset.Factor, weight: 1, datasets: []};
        });
        this.factors = this.hsUtilsService.removeDuplicates(
          this.factors,
          'name'
        );
        this.factors.forEach((factor) => {
          factor.datasets = data
            .filter((ds) => ds.Factor === factor.name)
            .map((ds) => {
              return {
                name: ds.Name,
                desc: ds.Description,
                included: true,
              };
            });
        });
        this.apply();
      })
      .catch((error) => {
        console.warn(`Web service at ${this.serviceBaseUrl} unavailable!`);
        console.log(error);
        this._clusteringInProcess = false;
      });
  }

  /**
   * @returns {boolean} true if clustering is in process, false otherwise
   */
  isClusteringInProcess(): boolean {
    return this._clusteringInProcess;
  }
}