/* eslint-disable no-restricted-syntax */
/* eslint-disable no-console */
import {HttpClient} from '@angular/common/http';
import {Injectable} from '@angular/core';
import {forkJoin} from 'rxjs';

import {HsDialogContainerService} from 'hslayers-ng';
import {HsToastService} from 'hslayers-ng';
import {HsUtilsService} from 'hslayers-ng';

import attractivenessConfig from '../attractiveness.config.json';
import clusteringMethods from '../data/clustering_methods.json';
import {AdjusterEventService} from './adjuster-event.service';
import {AdjusterLegendService} from './adjuster-legend.service';
import {AdjusterPresetsService, Factor} from './adjuster-presets.service';
import {
  AttractivenessClustersService,
  MethodDescription,
} from './attractiveness-clusters.service';
import {AttractivenessIndexService} from './attractiveness-index.service';
import {RDFSubject} from './ontology.model';
import {nuts3IndexSource} from '../app.config';

@Injectable({providedIn: 'root'})
export class AdjusterService {
  /** To be read from a config file */
  allowedClusteringMethods: Array<string>;
  /** To be read from a config file */
  initialWeights: Record<string, number>;
  /** To be read from a config file */
  serviceBaseUrl: string;
  /** Used in the UI as a selector */
  allowClusters = true;
  /** Used in the UI as a selector */
  allowIndex = false;
  factors: Array<Factor> = [];
  layersReady = new Set();
  //clusters = [];
  //method: string;
  methods: Array<MethodDescription>;
  numberOfClusters: number;
  private _clusteringInProcess: boolean;
  private _clustersLoaded: boolean;
  /** Once instantiated, the load is definitely in process */
  private _loadInProcess = true;
  private _raiInProcess: boolean;

  constructor(
    public adjusterEventService: AdjusterEventService,
    public adjusterLegendService: AdjusterLegendService,
    public adjusterPresetsService: AdjusterPresetsService,
    public attractivenessIndexService: AttractivenessIndexService,
    public attractivenessClustersService: AttractivenessClustersService,
    public hsDialogContainerService: HsDialogContainerService,
    public hsToastService: HsToastService,
    public hsUtilsService: HsUtilsService,
    public httpClient: HttpClient
  ) {
    // First safely set configurable properties
    this.allowedClusteringMethods =
      attractivenessConfig?.allowedClusteringMethods ?? [];
    this.initialWeights = attractivenessConfig?.initialWeights ?? {};
    this.serviceBaseUrl = this.adjusterPresetsService.serviceBaseUrl;

    this.methods = clusteringMethods.filter((m) =>
      this.allowedClusteringMethods.includes(m.codename)
    );
    this.numberOfClusters = 12;

    /* Get the ontology file from the service */
    this.loadOntology();

    /* Wait for all layers to be ready */
    this.adjusterEventService.layerReady.subscribe(({name}) => {
      console.log(name + ' ready!');
      this.layersReady.add(name);
      /* Layers for each method + layer for index are ready */
      if (this.layersReady.size == this.methods.length + 1) {
        this.adjusterEventService.layerReady.complete();
      }
    });

    /* Ensure that all layers, the loader component and the presets from ontology are ready */
    forkJoin({
      lyr: this.adjusterEventService.layerReady,
      load: this.adjusterEventService.loaderReady,
      ont: this.adjusterEventService.ontologyLoads,
    }).subscribe(() => {
      console.log('Oll layers Korekt! Initializing adjuster...');
      //this._loadInProcess = false;
      this.init();
    });

    /* Listen to schema changes so the factors can be re-arranged in the view */
    this.adjusterPresetsService.schemaChanges.subscribe((newSchema) => {
      const orphanedDatasets = [];
      this.factors = newSchema.groups.map((group) => {
        const datasets = this.adjusterPresetsService.getGroupDatasets(group.id);
        if (datasets.length < 3) {
          orphanedDatasets.push(...datasets);
        }
        return {
          id: group.id,
          labels: group.labels,
          weight: this.resetFactorWeights(group.id),
          datasets: this.adjusterPresetsService.getGroupDatasets(group.id),
        };
      });
      this.factors = this.factors.filter(
        (factor) => factor.datasets.length >= 3
      );
      this.factors.push({
        id: 'others',
        labels: [
          {'@value': 'Ostatní', '@language': 'cs'},
          {'@value': 'Others', '@language': 'en'},
        ],
        weight: this.resetFactorWeights('others'),
        datasets: orphanedDatasets,
      });
      this.adjusterLegendService.updateIndexLayerPopUps(this.factors);
    });

    /* Listen to problem changes so the datasets can be turned on/off */
    this.adjusterPresetsService.problemChanges.subscribe((newProblem) => {
      if (!newProblem) {
        return;
      }
      for (const factor of this.factors) {
        for (const dataset of factor.datasets) {
          dataset.included = false;
          if (newProblem.requiredDatasets.includes(dataset.id)) {
            dataset.included = true;
          }
        }
      }
    });
  }

  /**
   * Sends a request to polirural-attractiveness-service
   * and applies the returned values
   */
  apply(): void {
    if (this.allowIndex) {
      this.calculateIndex();
    }
    if (this.allowClusters) {
      this.calculateClusters();
    }
  }

  async calculateIndex(): Promise<void> {
    this._raiInProcess = true;
    let attractivenessData: any;
    try {
      attractivenessData = await this.httpClient
        .post(this.serviceBaseUrl + 'eu/scores/', {
          factors: this.factors.map((f) => {
            return {
              factor: f.id,
              weight: f.weight,
              datasets: f.datasets
                .filter((ds) => ds.included)
                .map((ds) => ds.id),
            };
          }),
        })
        .toPromise();
    } catch (error) {
      this.hsToastService.createToastPopupMessage(
        'Error loading data',
        `Error obtaining data from ${this.serviceBaseUrl}.`
      );
      console.warn(`Error obtaining data from ${this.serviceBaseUrl}.`);
      console.log(error);
      this._raiInProcess = false;
      this.adjusterEventService.loaded.next({
        success: true,
        type: 'index',
        err: error,
      });
      return;
    }
    // Spread the 'aggregate' value between 0 and 1
    const min = attractivenessData.reduce((a, b) =>
      a.aggregate < b.aggregate ? a : b
    ).aggregate;
    const max = attractivenessData.reduce((a, b) =>
      a.aggregate > b.aggregate ? a : b
    ).aggregate;
    const coefficient = 1 / (max - min);
    const constant = -min * coefficient;
    attractivenessData.forEach((a) => {
      a.aggregate *= coefficient;
      a.aggregate += constant;
    });
    // Store relation between region and its data in a hash-table-like structure
    // more memory consuming, but faster then find()
    const codeRecordRelations = {};
    attractivenessData.forEach((a) => {
      codeRecordRelations[a.code.toUpperCase()] = a;
    });
    console.time('forEach-Index');
    this.attractivenessIndexService.processIndex(
      nuts3IndexSource,
      codeRecordRelations
    );
    console.timeEnd('forEach-Index');
    this._raiInProcess = false;
    this.adjusterEventService.loaded.next({
      success: true,
      type: 'index',
    });
  }

  async calculateClusters(): Promise<void> {
    this._clusteringInProcess = true;
    /* Pre-process the API params */
    const params = [];
    for (const factor of this.factors) {
      for (const dataset of factor.datasets) {
        if (!dataset.included) {
          continue;
        }
        const flattenedDataset = {
          id: dataset.id.split('/').slice(-1).pop(), //We do not need full URIs as the URNs are unique across the ontology
          factor: factor.id.split('/').slice(-1).pop(), //We do not need full URIs as the URNs are unique across the ontology
          weight: factor.weight,
        };
        params.push(flattenedDataset);
      }
    }
    let data: any;
    try {
      data = await this.httpClient
        .post(this.serviceBaseUrl + 'eu/clusters/', {
          numberOfClusters: this.numberOfClusters,
          datasets: params,
        })
        .toPromise();
    } catch (error) {
      this.hsToastService.createToastPopupMessage(
        'Error loading data',
        `Error obtaining data from ${this.serviceBaseUrl}.`
      );
      console.warn(`Error obtaining data from ${this.serviceBaseUrl}.`);
      console.log(error);
      this._clusteringInProcess = false;
      this.adjusterEventService.loaded.next({
        success: false,
        type: 'clusters',
        err: error,
      });
      return;
    }
    const clusterData = data.response;
    // Store relation between region and its data in a hash-table-like structure
    // more memory consuming, but much faster then find()
    const codeRecordRelations = {};
    clusterData.forEach((c) => {
      codeRecordRelations[c['nuts_id'].toUpperCase()] = c;
    });
    console.time('forEach-Cluster');
    /*const clusters = [];
        for (const region of clusterData) {
          if (!clusters.includes(region[this.method])) {
            clusters.push(region[this.method]);
          }
        }*/
    for (const method of this.methods) {
      this.attractivenessClustersService.processClusters(
        method,
        codeRecordRelations
      );
      // Fake the legend
      (method.layer.getSource() as any).legend_categories =
        this.adjusterLegendService.createClusterLegend(this.numberOfClusters);
    }
    console.timeEnd('forEach-Cluster');
    /*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;
        });*/
    // Fake the legend
    //nuts.nuts3ClustersSource.legend_categories =
    //  this.adjusterLegendService.createClusterLegend(this.numberOfClusters);
    this._clustersLoaded = true;
    this._clusteringInProcess = false;
    this.adjusterEventService.loaded.next({
      success: true,
      type: 'clusters',
    });
  }

  /**
   * On init, calculate both index and clusters nevertheless if they are enabled or disabled in the UI
   */
  async init(): Promise<void> {
    this.calculateIndex();
    this.calculateClusters();
    // In HSL 2.5, setting layer greyscale breaks the print() functionality
    //this.hsLayerManagerService.setGreyscale(osmLayer);
  }

  async loadOntology() {
    try {
      const onto = await this.httpClient
        .get<RDFSubject[]>(this.serviceBaseUrl + 'ontology/')
        .toPromise();
      this.adjusterEventService.ontologyLoads.next(onto);
      this.adjusterEventService.ontologyLoads.complete();
    } catch (error) {
      this.hsToastService.createToastPopupMessage(
        'Error loading ontology',
        `Web service at ${this.serviceBaseUrl} unavailable!`
      );
      console.warn(`Web service at ${this.serviceBaseUrl} unavailable!`);
      console.log(error);
      this._loadInProcess = false;
    }
    this._loadInProcess = false;
  }

  resetFactorWeights(factorId: string): number {
    return this.initialWeights[factorId] ?? 0.5;
  }

  clustersLoaded(): boolean {
    return this._clustersLoaded;
  }

  /**
   * @returns {boolean} true if clustering or index processing is in process or loading data, false otherwise
   */
  isInProcess(): boolean {
    return (
      this._loadInProcess || this._clusteringInProcess || this._raiInProcess
    );
  }

  isLoading(): boolean {
    return this._loadInProcess;
  }

  isClustering(): boolean {
    return this._clusteringInProcess;
  }

  isCalculatingRAI(): boolean {
    return this._raiInProcess;
  }
}