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 {WeatherData} from '../models/WeatherData';
import {GeoJSON} from 'ol/format';
import {map, switchMap} from 'rxjs/operators';
import {getCenter} from 'ol/extent';
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import {IItem} from '../models/item';
@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=${ed}&t=observation&interval=hourly&key=${apiKey}`;
const forecast = `${endpoint}${this.apiForecast}/?c=${centroid[0]},${centroid[1]}&interval=hourly&key=${apiKey}`;
return this.httpClient.get<any[]>(historical).pipe(
map(h => h.map(d => ({...d, rain: d.rainPastHour}))),
switchMap(h => {
return this.httpClient.get<any[]>(forecast)
.pipe(
map(f => this.hourlyToDaily([...h, ...f.filter(fd => fd.time <= endDate)])
));
})
);
}
private hourlyToDaily(hourlyWeatherData: any[]): WeatherData[] {
const days = this.groupBy(hourlyWeatherData, hi => hi.time.split('T')[0]);
return Object.entries(days)
.reduce ( (result, entry) => {
const wData = entry[1];
const sortData = wData.sort(d => new Date(d.time).getHours() - 12);
const closestToTwelveOClockData = sortData[0];
if (closestToTwelveOClockData.length === 0) {
return result;
}
const bestCardinal = closestToTwelveOClockData.windDirectionCardinal;
const bestWindDirection = closestToTwelveOClockData.windDirection;
const bestIconCode = closestToTwelveOClockData.iconCode;
return [
...result,
{
date: entry[0],
iconCode: bestIconCode,
minTemperature: Math.min(...wData.map(d => d.temperature)),
maxTemperature: Math.max(...wData.map(d => d.temperature)),
relHumidity: wData.reduce( (r, e) => r + e.relativeHumidity, 0) / wData.length,
precipitation: wData.reduce( (r, e) => r + e.rain, 0),
wSpeed: wData.reduce( (r, e) => r + e.windSpeed, 0) / wData.length,
wDir: bestWindDirection,
wCardinal: bestCardinal
}
];
}, []);
}
private groupBy(items: any[], selector: (item) => any): any[] {
return items.reduce(
(result, item) => {
const group = selector(item);
return ({
...result,
[group]: [
...(result[group] || []),
item,
],
});},
{},
);
}
private removeUTCZ(dateFormat: string): string {
if (dateFormat[dateFormat.length - 1] === 'Z') {
return dateFormat.substring(0, dateFormat.length - 1);
}
return dateFormat;
}
}