import { Injectable } from '@nestjs/common';
import { Geodesic as Geolib, GeodesicClass } from 'geographiclib-geodesic';
import { IGeodesic } from '../../domain/interfaces/geodesic.interface';

@Injectable()
export class Geodesic implements IGeodesic {
  private geod: GeodesicClass;

  constructor() {
    this.geod = Geolib.WGS84;
  }

  inverse = (
    lon1: number,
    lat1: number,
    lon2: number,
    lat2: number,
  ): { azimuth: number; distance: number } => {
    const { azi2: azimuth, s12: distance } = this.geod.Inverse(
      lat1,
      lon1,
      lat2,
      lon2,
    );
    return { azimuth, distance };
  };
}