using System;

namespace TINK.Model.Map
{
	/// <summary> Holds the displayed map area. </summary>
	public class MapSpan : IMapSpan
	{
		internal MapSpan(IPosition center, double radius)
		{
			if (!GetIsValid(center, radius))
				throw new ArgumentNullException();

			Center = center;
			Radius = radius;
		}

		/// <summary> Center of map displayed area.</summary>
		public IPosition Center { get; }

		/// <summary> Radius of displayed map area. </summary>
		public double Radius { get; }

		public bool IsValid => GetIsValid(Center, Radius);

		public static bool GetIsValid(IPosition center, double radius)
			=> center != null
				&& center.IsValid
				&& !double.IsNaN(radius);
	}
}