using System;
using System.ComponentModel.DataAnnotations;

namespace WebMVC.ViewModels.Annotations
{
	[AttributeUsage(AttributeTargets.Property | AttributeTargets.Field, AllowMultiple = true)]
	public class LatitudeCoordinate : ValidationAttribute
	{
		protected override ValidationResult
			   IsValid(object value, ValidationContext validationContext)
		{
			double coordinate;
			if (!double.TryParse(value.ToString(), out coordinate) || (coordinate < -90 || coordinate > 90))
			{
				return new ValidationResult
				    ("Latitude must be between -90 and 90 degrees inclusive.");
			}

			return ValidationResult.Success;
		}
	}
}