using System;

using Newtonsoft.Json;

namespace Geocoding

{

public class Location

{

double latitude;

double longitude;

[JsonProperty("lat")]

public virtual double Latitude

{

get { return latitude; }

set

{

if (value < -90 || value > 90)

throw new ArgumentOutOfRangeException("Latitude", value, "Value must be between -90 and 90 inclusive.");

if (double.IsNaN(value))

throw new ArgumentException("Latitude must be a valid number.", "Latitude");

latitude = value;

}

}

[JsonProperty("lng")]

public virtual double Longitude

{

get { return longitude; }

set

{

if (value < -180 || value > 180)

throw new ArgumentOutOfRangeException("Longitude", value, "Value must be between -180 and 180 inclusive.");

if (double.IsNaN(value))

throw new ArgumentException("Longitude must be a valid number.", "Longitude");

longitude = value;

}

}

protected Location()

: this(0, 0)

{

}

public Location(double latitude, double longitude)

{

Latitude = latitude;

Longitude = longitude;

}

protected virtual double ToRadian(double val)

{

return (Math.PI / 180.0) * val;

}

public virtual Distance DistanceBetween(Location location)

{

return DistanceBetween(location, DistanceUnits.Miles);

}

public virtual Distance DistanceBetween(Location location, DistanceUnits units)

{

double earthRadius = (units == DistanceUnits.Miles) ? Distance.EarthRadiusInMiles : Distance.EarthRadiusInKilometers;

double latRadian = ToRadian(location.Latitude - this.Latitude);

double longRadian = ToRadian(location.Longitude - this.Longitude);

double a = Math.Pow(Math.Sin(latRadian / 2.0), 2) +

Math.Cos(ToRadian(this.Latitude)) *

Math.Cos(ToRadian(location.Latitude)) *

Math.Pow(Math.Sin(longRadian / 2.0), 2);

double c = 2.0 * Math.Asin(Math.Min(1, Math.Sqrt(a)));

double distance = earthRadius * c;

return new Distance(distance, units);

}

public override bool Equals(object obj)

{

return Equals(obj as Location);

}

public bool Equals(Location coor)

{

if (coor == null)

return false;

return (this.Latitude == coor.Latitude && this.Longitude == coor.Longitude);

}

public override int GetHashCode()

{

return Latitude.GetHashCode() ^ Latitude.GetHashCode();

}

public override string ToString()

{

return string.Format("{0}, {1}", latitude, longitude);

}

}

}