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

import {HsConfig} from 'hslayers-ng';

import {FieldService} from './field.service';
import {ZonesService} from './zones.service';

export type Index = 'EVI' | 'RVI4S1';

@Injectable({providedIn: 'root'})
export class CalculatorService {
  availableDates: Array<string>;
  availableProducts = ['EVI', 'RVI4S1'];
  dateRangeSelects: Subject<{date: string}> = new Subject();
  dateCalendarSelects: Subject<{date: string}> = new Subject();
  selectedDate;
  //selectedProduct;
  serviceBaseUrl = 'https://fieldcalc.lesprojekt.cz/';
  private _datesLoading: boolean;
  private _zonesLoading: boolean;

  constructor(
    private fieldService: FieldService,
    private hsConfig: HsConfig,
    private httpClient: HttpClient,
    private zonesService: ZonesService
  ) {
    this.dateRangeSelects.subscribe(({date}) => {
      this.selectedDate = date;
    });
  }

  noDates(): boolean {
    return this.availableDates === undefined;
  }

  /**
   * Call 'get_dates' API method
   */
  async getDates({product}: {product: Index}) {
    this.availableDates = undefined;
    this._datesLoading = true;
    try {
      const data = await this.httpClient
        .get<{dates: string[]}>(
          (this.proxyEnabled() ? this.hsConfig.proxyPrefix : '') +
            this.serviceBaseUrl +
            'get_dates?' +
            'product=' +
            product +
            '&centroid=' +
            JSON.stringify(this.fieldService.getSelectedFieldCentroid())
        )
        .toPromise();
      this._datesLoading = false;
      console.log('data received!');
      console.log(data);
      this.availableDates = data.dates;
      /* Any previously selected date must be cleaned up
       * so it won't get sent to the API as a wrong param
       */
      this.selectedDate = undefined;
    } catch (err) {
      this._datesLoading = false;
      console.error('Somethin fucked up!');
      console.log(err);
    }
  }

  get datesLoading() {
    return this._datesLoading;
  }

  get zonesLoading() {
    return this._zonesLoading;
  }

  /**
   * Call 'get_zones' API method
   */
  async getZones({product}: {product: Index}) {
    this._zonesLoading = true;
    try {
      const data = await this.httpClient
        .post(
          (this.proxyEnabled() ? this.hsConfig.proxyPrefix : '') +
            this.serviceBaseUrl +
            'get_zones',
          {
            product,
            date: this.selectedDate,
            format: 'geojson',
            geojson: this.fieldService.getSelectedFieldGeoJSON(),
          },
          {
            headers: {
              'Content-Type': 'application/json',
              'Accept': 'application/json',
            },
          }
        )
        .toPromise();
      console.log('data received!');
      console.log(data);
      this._zonesLoading = false;
      this.zonesService.updateZones(data);
    } catch (err) {
      this._zonesLoading = false;
      console.error('Somethin fucked up!');
      console.log(err);
    }
  }

  private proxyEnabled(): boolean {
    return this.hsConfig.useProxy === undefined || this.hsConfig.useProxy;
  }
}