using Chernobyl.Collections.Generic.Event;
using Chernobyl.Values;

namespace Chernobyl.Collections.Generic.Graph
{
    /// <summary>
    /// A basic implementation of an <see cref="IDataNode{T}" />.
    /// </summary>
    /// <typeparam name="T">The type of the data contained by <c>this</c>.</typeparam>
    public class DataNode<T> : IDataNode<T>
    {
        /// <summary>
        /// Initializes a new instance of the <see cref="DataNode{T}"/> class that
        /// holds its data in a non-modifiable <see cref="IValue{T}"/>.
        /// </summary>
        /// <param name="data">The data held by this vertex.</param>
        public DataNode(T data)
            : this(new BasicContainer<T>(data))
        {}

        /// <summary>
        /// Initializes a new instance of the <see cref="DataNode{T}"/> class.
        /// </summary>
        /// <param name="data">The data held by this vertex.</param>
        public DataNode(IValue<T> data)
        {
            Data = data;
            Connections = new DecoratingEventCollection<INode>(new NodeConnections(this));
        }

        /// <summary>
        /// The data held by this vertex.
        /// </summary>
        public IValue<T> Data { get; private set; }

        /// <summary>
        /// The other vertices in the network that <c>this</c> vertex is 
        /// connected to.
        /// </summary>
        public IEventCollection<INode> Connections { get; private set; }
    }
}