using System;

namespace ChadSoft.Validators
{
    [AttributeUsage(AttributeTargets.Property | AttributeTargets.Field, 
        AllowMultiple = false, Inherited = true)]
    public class RequiredFieldValidatorAttribute : ValidatorAttribute
    {
        public override bool IsValid(object val)
        {
            // if the value is null, the test fails!
            if(val == null) return false;

            var isValid = false;

            if (val is String)
                isValid = !string.IsNullOrEmpty((string)val);
            else if (val is DateTime)
                isValid = ((DateTime)val) != DateTime.MinValue;
            else if (val is Guid)
                isValid = ((Guid)val) != Guid.Empty;
            else if(val.GetType().IsValueType)
                isValid = val != Activator.CreateInstance(val.GetType());
            else
                isValid = val != null;

            return isValid;
        }

    }
}