using System;

namespace Be.Timvw.Framework.Domain
{
    public class Effectivity<T> : IEffectivity<T> where T : IComparable<T>
    {
        #region Private Fields

        private readonly T element;
        private readonly IRange<DateTime> validityPeriod;

        #endregion

        #region Public Constructors

        public Effectivity(T element, IRange<DateTime> validityPeriod)
        {
            this.element = element;
            this.validityPeriod = validityPeriod;
        }

        #endregion

        #region IEffectivity<T> Members

        public T Element
        {
            get { return this.element; }
        }

        public IRange<DateTime> ValidityPeriod
        {
            get { return this.validityPeriod; }
        }

        public bool IsEffectiveOn(DateTime validityDate)
        {
            return this.validityPeriod.Includes(validityDate);
        }

        #endregion

        #region IComparable<IEffectivity<T>> Members

        public int CompareTo(IEffectivity<T> other)
        {
            int validityPeriodCompareResult = this.validityPeriod.CompareTo(other.ValidityPeriod);
            if (validityPeriodCompareResult != 0)
            {
                return validityPeriodCompareResult;
            }

            return this.element.CompareTo(other.Element);
        }

        #endregion
    }
}