FarmMapsLib/projects/common/src/fm/services/weather.service.ts

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import {Injectable} from '@angular/core';
import {HttpClient} from '@angular/common/http';
import {AppConfig} from '../shared/app.config';
import {Observable} from 'rxjs';
import {WeatherCurrentObservation} from '../models/weatherCurrentObservation';
import {DatePipe} from '@angular/common';
import {IItem} from '@farmmaps/common';
import {WeatherData} from '../models/WeatherData';
import {GeoJSON} from 'ol/format';
import {map, switchMap} from 'rxjs/operators';
import {getCenter} from 'ol/extent';
@Injectable({
providedIn: 'root',
})
export class WeatherService {
private apiCurrentObservationUrl = 'currentobservation';
private apiObservation = 'observation';
private apiForecast = 'forecast';
private format: GeoJSON;
constructor(public httpClient: HttpClient, public appConfig: AppConfig, private datePipe: DatePipe) {
this.format = new GeoJSON();
}
public GetCurrentObservation(centroid: number[]): Observable<WeatherCurrentObservation> {
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const endpoint = this.appConfig.getConfig('weatherApiEndPoint');
const apiKey = this.appConfig.getConfig('weatherApiKey');
const observationUrl = `${endpoint}${this.apiCurrentObservationUrl}/?c=${centroid[0]},${centroid[1]}&key=${apiKey}`;
return this.httpClient.get<WeatherCurrentObservation>(observationUrl);
}
public getWeatherRangeForItem(item: IItem, daysBefore = 10, daysAfter = 10): Observable<WeatherData[]> {
const geometry = this.format.readGeometry(item.geometry);
const centroid = getCenter(geometry.getExtent());
const currentDate = new Date(Date.now());
const sd = new Date(Date.now());
const ed = new Date(Date.now());
sd.setDate((currentDate.getDate() - daysBefore));
ed.setDate((currentDate.getDate() + daysAfter));
return this.getWeatherRange(centroid, this.datePipe.transform(sd, 'yyyy-MM-ddThh:mm:ss'),
this.datePipe.transform(ed, 'yyyy-MM-ddThh:mm:ss'));
}
public getWeatherRange(centroid: number[], startDate: string, endDate: string): Observable<WeatherData[]> {
const endpoint = this.appConfig.getConfig('weatherApiEndPoint');
const apiKey = this.appConfig.getConfig('weatherApiKey');
// weather does not support UTC format, also remove Z
const sd = encodeURIComponent(this.removeUTCZ(startDate));
const ed = encodeURIComponent(this.removeUTCZ(endDate));
const historical = `${endpoint}${this.apiObservation}/?c=${centroid[0]},${centroid[1]}&sd=${sd}&ed=${ed}&interval=daily&key=${apiKey}`;
const forecast = `${endpoint}${this.apiForecast}/?c=${centroid[0]},${centroid[1]}&interval=daily&key=${apiKey}`;
return this.httpClient.get<any[]>(historical).pipe(
map(h => h.map(this.createWeatherDataFromHistorical)),
switchMap(h => {
return this.httpClient.get<any[]>(forecast)
.pipe(
map(f => [...h, ...f.filter(fd => fd.date <= endDate)
.map(this.createWeatherDataFromForecast)]));
})
);
}
private createWeatherDataFromHistorical(hd): WeatherData {
return {time: hd.date, minTemp: hd.minimumTemperature,
maxTemp: hd.maximumTemperature, relativeHumidity: hd.relativeHumidity, rain: hd.precipitation};
}
private createWeatherDataFromForecast(fd): WeatherData {
return {time: fd.date, minTemp: fd.minimumTemperature,
maxTemp: fd.maximumTemperature, relativeHumidity: fd.relativeHumidity, rain: fd.rain};
}
private removeUTCZ(dateFormat: string): string {
if (dateFormat[dateFormat.length - 1] === 'Z') {
return dateFormat.substring(0, dateFormat.length - 1);
}
return dateFormat;
}
}