// MonoGame - Copyright (C) The MonoGame Team
// This file is subject to the terms and conditions defined in
// file 'LICENSE.txt', which is part of this source code package.

using System;
using System.Collections;
using System.Collections.Generic;

namespace Microsoft.Xna.Framework.Content.Pipeline
{
    public class NamedValueDictionary<T> : IDictionary<string, T>
    {
        readonly Dictionary<string, T> dict = new Dictionary<string,T>();

        /// <summary>
        /// Initializes an instance of NamedValueDictionary.
        /// </summary>
        public NamedValueDictionary()
        {
        }

        /// <summary>
        /// Adds the specified key and value to the dictionary.
        /// </summary>
        /// <param name="key">Identity of the key of the new data pair.</param>
        /// <param name="value">The value of the new data pair.</param>
        public void Add(string key, T value)
        {
            dict.Add(key, value);
        }

        /// <summary>
        /// Determines whether the specified key is present in the dictionary.
        /// </summary>
        /// <param name="key">Identity of a key.</param>
        /// <returns></returns>
        public bool ContainsKey(string key)
        {
            return dict.ContainsKey(key);
        }

        /// <summary>
        /// Gets all keys contained in the dictionary.
        /// </summary>
        public ICollection<string> Keys
        {
            get { return dict.Keys; }
        }

        /// <summary>
        /// Removes the specified key and value from the dictionary.
        /// </summary>
        /// <param name="key">Identity of the key to be removed.</param>
        /// <returns>true if the value is present; false otherwise.</returns>
        public bool Remove(string key)
        {
            return dict.Remove(key);
        }

        /// <summary>
        /// Gets the value associated with the specified key.
        /// </summary>
        /// <param name="key">Identity of the key of the element whose value is to be retrieved.</param>
        /// <param name="value">The current value of the element.</param>
        /// <returns>true if the value is present; false otherwise.</returns>
        public bool TryGetValue(string key, out T value)
        {
            return dict.TryGetValue(key, out value);
        }

        /// <summary>
        /// Specifies the type hint for the intermediate serializer. Values of this type do not store an explicit type attribute in the related XML source.
        /// </summary>
        protected internal virtual Type DefaultSerializerType
        {
            get { return typeof(T); }
        }

        /// <summary>
        /// Gets all values contained in the dictionary.
        /// </summary>
        public ICollection<T> Values
        {
            get { return dict.Values; }
        }

        /// <summary>
        /// Gets or sets the specified item.
        /// </summary>
        /// <param name="key">Identity of a key.</param>
        public T this[string key]
        {
            get
            {
                return dict[key];
            }
            set
            {
                dict[key] = value;
            }
        }

        /// <summary>
        /// Adds an item to the collection.
        /// </summary>
        /// <param name="item">The item to add to the collection.</param>
        void ICollection<KeyValuePair<string, T>>.Add(KeyValuePair<string, T> item)
        {
            ((ICollection<KeyValuePair<string, T>>)dict).Add(item);
        }

        /// <summary>
        /// Removes all keys and values from the dictionary.
        /// </summary>
        public void Clear()
        {
            dict.Clear();
        }

        /// <summary>
        /// Determines whether the collection contains a specific value.
        /// </summary>
        /// <param name="item">The object to locate in the collection.</param>
        /// <returns>true if the collection contains the object; false otherwise.</returns>
        bool ICollection<KeyValuePair<string, T>>.Contains(KeyValuePair<string, T> item)
        {
            return ((ICollection<KeyValuePair<string, T>>)dict).Contains(item);
        }

        /// <summary>
        /// Copies the elements of the collection to an array, starting at a specified index.
        /// </summary>
        /// <param name="array">The destination array.</param>
        /// <param name="arrayIndex">The index at which to begin the copy.</param>
        void ICollection<KeyValuePair<string, T>>.CopyTo(KeyValuePair<string, T>[] array, int arrayIndex)
        {
            ((ICollection<KeyValuePair<string, T>>)dict).CopyTo(array, arrayIndex);
        }

        /// <summary>
        /// Gets the number of items in the dictionary.
        /// </summary>
        public int Count
        {
            get { return dict.Count; }
        }

        /// <summary>
        /// Gets a value indicating if this object is read-only.
        /// </summary>
        bool ICollection<KeyValuePair<string, T>>.IsReadOnly
        {
            get { return false; }
        }

        /// <summary>
        /// Removes the first occurrence of the specified object from the collection.
        /// </summary>
        /// <param name="item">The item to remove from the collection.</param>
        /// <returns>true if the item was successfully removed from the collection; false otherwise.</returns>
        bool ICollection<KeyValuePair<string, T>>.Remove(KeyValuePair<string, T> item)
        {
            return ((ICollection<KeyValuePair<string, T>>)dict).Remove(item);
        }

        /// <summary>
        /// Gets an enumerator that iterates through items in a dictionary.
        /// </summary>
        /// <returns>Enumerator for iterating through the dictionary.</returns>
        public IEnumerator<KeyValuePair<string, T>> GetEnumerator()
        {
            return dict.GetEnumerator();
        }

        /// <summary>
        /// Returns an enumerator that can iterate through this collection.
        /// </summary>
        /// <returns>An enumerator that can iterate through this collection</returns>
        IEnumerator IEnumerable.GetEnumerator()
        {
            return dict.GetEnumerator();
        }

        /// <summary>
        /// Adds an element to the dictionary.
        /// </summary>
        /// <param name="key">Identity of the key of the new element.</param>
        /// <param name="value">The value of the new element.</param>
        protected virtual void AddItem(string key, T value)
        {
            dict.Add(key, value);
        }

        /// <summary>
        /// Removes all elements from the dictionary.
        /// </summary>
        protected virtual void ClearItems()
        {
            dict.Clear();
        }

        /// <summary>
        /// Removes the specified element from the dictionary.
        /// </summary>
        /// <param name="key">Identity of the key of the data pair to be removed.</param>
        /// <returns>true if the value is present; false otherwise.</returns>
        protected virtual bool RemoveItem(string key)
        {
            return dict.Remove(key);
        }

        /// <summary>
        /// Modifies the value of an existing element.
        /// </summary>
        /// <param name="key">Identity of the element to be modified.</param>
        /// <param name="value">The value to be set.</param>
        protected virtual void SetItem(string key, T value)
        {
            dict[key] = value;
        }
    }
}