/*
 * Copyright 2020 Red Hat, Inc. and/or its affiliates.
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *      http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

package org.acme.vaccinationscheduler.domain;

import com.fasterxml.jackson.annotation.JsonFormat;

import static java.lang.Math.ceil;
import static java.lang.Math.sqrt;

@JsonFormat(shape = JsonFormat.Shape.ARRAY)
public class Location {

    // Approximate Metric Equivalents for Degrees. At the equator for longitude and for latitude anywhere,
    // the following approximations are valid: 1° = 111 km (or 60 nautical miles) 0.1° = 11.1 km.
    public static final double METERS_PER_DEGREE = 111_000;

    public final double latitude;
    public final double longitude;

    public Location(double latitude, double longitude) {
        this.latitude = latitude;
        this.longitude = longitude;
    }

    public long getDistanceTo(Location other) {
        double latitudeDiff = other.latitude - this.latitude;
        double longitudeDiff = other.longitude - this.longitude;
        return (long) ceil(sqrt(latitudeDiff * latitudeDiff + longitudeDiff * longitudeDiff) * METERS_PER_DEGREE);
    }

    @Override
    public String toString() {
        return String.format("[%.4fN, %.4fE]", latitude, longitude);
    }

}
