using System.Collections.Generic;
using JD.Collections.Interfaces;
using JD.Kernel.StaticHelpers;

namespace JD.Collections.ObjectModel
{
    public class ReadOnlyKeyedCollection<TKey, TValue> : ReadOnlyCollectionBase<TValue>, IKeyedCollection<TKey, TValue>
    {
        #region Variables

        private readonly KeyedCollection<TKey, TValue> m_wrappedCollection;

        #endregion

        #region Constructor

        /// <summary>
        /// Constructor.
        /// </summary>
        /// <param name="collection"></param>
        public ReadOnlyKeyedCollection(KeyedCollection<TKey, TValue> collection)
        {
            Throw.IfNull(collection, "collection");
            m_wrappedCollection = collection;
        }

        #endregion

        #region Properties

        /// <summary>
        /// Count.
        /// </summary>
        public override int Count
        {
            get { return m_wrappedCollection.Count; }
        }

        /// <summary>
        /// Indexer.
        /// </summary>
        /// <param name="key"></param>
        /// <returns></returns>
        public TValue this[TKey key]
        {
            get { return m_wrappedCollection[key]; }
        }

        #endregion

        #region Methods

        /// <summary>
        /// ContainsKey.
        /// </summary>
        /// <param name="key"></param>
        /// <returns></returns>
        public bool ContainsKey(TKey key)
        {
            return m_wrappedCollection.ContainsKey(key);
        }

        /// <summary>
        /// Remove.
        /// </summary>
        /// <param name="key"></param>
        /// <returns></returns>
        public bool Remove(TKey key)
        {
            MethodModifiesCollection();
            return false;
        }

        public bool TryGetValue(TKey key, out TValue value)
        {
            return m_wrappedCollection.TryGetValue(key, out value);
        }

        /// <summary>
        /// GetEnumerator.
        /// </summary>
        /// <returns></returns>
        public override IEnumerator<TValue> GetEnumerator()
        {
            return m_wrappedCollection.GetEnumerator();
        }

        #endregion
    }
}