using System.Collections.Generic;

namespace Chernobyl.Values
{
    /// <summary>
    /// A basic implementation of an <see cref="IContainer{T}"/>.
    /// </summary>
    /// <typeparam name="T">The type held by <see cref="BasicContainer{T}"/>.</typeparam>
    public class BasicContainer<T> : HeldValue<T>, IContainer<T>
    {
        /// <summary>
        /// Initializes a new instance of the <see cref="BasicContainer{T}"/> class.
        /// </summary>
        public BasicContainer()
            : this(default(T))
        { }

        /// <summary>
        /// Initializes a new instance of the <see cref="BasicContainer{T}" /> class.
        /// </summary>
        /// <param name="value">The value held by this instance.</param>
        public BasicContainer(T value)
            : this(value, EqualityComparer<T>.Default)
        {}

        /// <summary>
        /// Initializes a new instance of the <see cref="BasicContainer{T}" /> class.
        /// </summary>
        /// <param name="value">The value held by this instance.</param>
        /// <param name="comparer">The instance used to compare new and previous
        /// values of <see cref="IContainer{T}.Value" /> to determine if
        /// <see cref="IValue{T}.Provide" /> should be raised.</param>
        public BasicContainer(T value, IEqualityComparer<T> comparer)
            : base(value, comparer)
        {
            IsReady = true;
        }

        /// <summary>
        /// The value held by this instance. If the value has not yet been
        /// provided it will be equal to <c>default(T)</c>.
        /// </summary>
        public new T Value
        {
            get { return base.Value; }
            protected set { base.Value = value; }
        }
    }
}