using System;

namespace StuntJuice.Portal.Core.DesignByContract
{
    public sealed class StringCheckOptions
    {
        private string _stringToCheck;
        private string _message;

        public StringCheckOptions(string stringToCheck)
        {
            _stringToCheck = stringToCheck;
        }

        public void IsNotNullOrEmpty()
        {
            if (String.IsNullOrEmpty(_stringToCheck))
                Check.ThrowArgumentNullException(_message);
        }

        public StringCheckOptions WithMessage(string message)
        {
            _message = message;
            return this;
        }
    }

    public sealed class ObjectCheckOptions
    {
        private object _objectToCheck;
        private string _message;

        public ObjectCheckOptions(object objectToCheck)
        {
            _objectToCheck = objectToCheck;
        }

        public void IsNotNull()
        {
            if (_objectToCheck == null)
                Check.ThrowArgumentNullException(_message);
        }

        public ObjectCheckOptions WithMessage(string message)
        {
            _message = message;
            return this;
        }
    }

    public sealed class Check
    {
        public static StringCheckOptions Parameter(string field)
        {
            return new StringCheckOptions(field);
        }

        public static ObjectCheckOptions Parameter(object param)
        {
            return new ObjectCheckOptions(param);
        }

        public static void ThrowArgumentNullException(string message)
        {
            if (!String.IsNullOrEmpty(message))
                throw new ArgumentNullException("", message);
            else
                throw new ArgumentNullException();
        }
    }
}