// Copyright 2004-2008 Castle Project - http://www.castleproject.org/
// 
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
// 
//     http://www.apache.org/licenses/LICENSE-2.0
// 
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.

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

namespace DevDefined.OAuth.Utility
{
	/// <summary>
	/// Pendent
	/// </summary>
	public class ReflectionBasedDictionaryAdapter : IDictionary
	{
		readonly Dictionary<string, object> _properties = new Dictionary<string, object>(StringComparer.OrdinalIgnoreCase);

		/// <summary>
		/// Initializes a new instance of the <see cref="ReflectionBasedDictionaryAdapter"/> class.
		/// </summary>
		/// <param name="target">The target.</param>
		public ReflectionBasedDictionaryAdapter(object target)
		{
			if (target == null)
			{
				throw new ArgumentNullException("target");
			}

			Type targetType = target.GetType();

			foreach (PropertyInfo property in targetType.GetProperties(BindingFlags.Public | BindingFlags.Instance))
			{
				if (!property.CanRead) continue;
				object value = property.GetValue(target, null);

				_properties[property.Name] = value;
			}
		}

		/// <summary>
		/// Determines whether the <see cref="T:System.Collections.IDictionary"/> object contains an element with the specified key.
		/// </summary>
		/// <param name="key">The key to locate in the <see cref="T:System.Collections.IDictionary"/> object.</param>
		/// <returns>
		/// true if the <see cref="T:System.Collections.IDictionary"/> contains an element with the key; otherwise, false.
		/// </returns>
		/// <exception cref="T:System.ArgumentNullException">
		/// 	<paramref name="key"/> is null. </exception>
		public bool Contains(object key)
		{
			return _properties.ContainsKey(key.ToString());
		}

		/// <summary>
		/// Gets or sets the <see cref="System.Object"/> with the specified key.
		/// </summary>
		/// <value></value>
		public object this[object key]
		{
			get
			{
				object value;
				_properties.TryGetValue(key.ToString(), out value);
				return value;
			}
			set { throw new NotImplementedException(); }
		}

		/// <summary>
		/// Adds an element with the provided key and value to the <see cref="T:System.Collections.IDictionary"/> object.
		/// </summary>
		/// <param name="key">The <see cref="T:System.Object"/> to use as the key of the element to add.</param>
		/// <param name="value">The <see cref="T:System.Object"/> to use as the value of the element to add.</param>
		/// <exception cref="T:System.ArgumentNullException">
		/// 	<paramref name="key"/> is null. </exception>
		/// <exception cref="T:System.ArgumentException">An element with the same key already exists in the <see cref="T:System.Collections.IDictionary"/> object. </exception>
		/// <exception cref="T:System.NotSupportedException">The <see cref="T:System.Collections.IDictionary"/> is read-only.-or- The <see cref="T:System.Collections.IDictionary"/> has a fixed size. </exception>
		public void Add(object key, object value)
		{
			throw new NotImplementedException();
		}

		/// <summary>
		/// Removes all elements from the <see cref="T:System.Collections.IDictionary"/> object.
		/// </summary>
		/// <exception cref="T:System.NotSupportedException">The <see cref="T:System.Collections.IDictionary"/> object is read-only. </exception>
		public void Clear()
		{
			throw new NotImplementedException();
		}

		/// <summary>
		/// Returns an <see cref="T:System.Collections.IDictionaryEnumerator"/> object for the <see cref="T:System.Collections.IDictionary"/> object.
		/// </summary>
		/// <returns>
		/// An <see cref="T:System.Collections.IDictionaryEnumerator"/> object for the <see cref="T:System.Collections.IDictionary"/> object.
		/// </returns>
		IDictionaryEnumerator IDictionary.GetEnumerator()
		{
			return new DictionaryEntryEnumeratorAdapter(_properties.GetEnumerator());
		}

		/// <summary>
		/// Removes the element with the specified key from the <see cref="T:System.Collections.IDictionary"/> object.
		/// </summary>
		/// <param name="key">The key of the element to remove.</param>
		/// <exception cref="T:System.ArgumentNullException">
		/// 	<paramref name="key"/> is null. </exception>
		/// <exception cref="T:System.NotSupportedException">The <see cref="T:System.Collections.IDictionary"/> object is read-only.-or- The <see cref="T:System.Collections.IDictionary"/> has a fixed size. </exception>
		public void Remove(object key)
		{
		}

		/// <summary>
		/// Gets an <see cref="T:System.Collections.ICollection"/> object containing the keys of the <see cref="T:System.Collections.IDictionary"/> object.
		/// </summary>
		/// <value></value>
		/// <returns>An <see cref="T:System.Collections.ICollection"/> object containing the keys of the <see cref="T:System.Collections.IDictionary"/> object.</returns>
		public ICollection Keys
		{
			get { return _properties.Keys; }
		}

		/// <summary>
		/// Gets an <see cref="T:System.Collections.ICollection"/> object containing the values in the <see cref="T:System.Collections.IDictionary"/> object.
		/// </summary>
		/// <value></value>
		/// <returns>An <see cref="T:System.Collections.ICollection"/> object containing the values in the <see cref="T:System.Collections.IDictionary"/> object.</returns>
		public ICollection Values
		{
			get { return _properties.Values; }
		}

		/// <summary>
		/// Gets a value indicating whether the <see cref="T:System.Collections.IDictionary"/> object is read-only.
		/// </summary>
		/// <value></value>
		/// <returns>true if the <see cref="T:System.Collections.IDictionary"/> object is read-only; otherwise, false.</returns>
		public bool IsReadOnly
		{
			get { return true; }
		}

		/// <summary>
		/// Gets a value indicating whether the <see cref="T:System.Collections.IDictionary"/> object has a fixed size.
		/// </summary>
		/// <value></value>
		/// <returns>true if the <see cref="T:System.Collections.IDictionary"/> object has a fixed size; otherwise, false.</returns>
		public bool IsFixedSize
		{
			get { throw new NotImplementedException(); }
		}

		/// <summary>
		/// Copies the elements of the <see cref="T:System.Collections.ICollection"/> to an <see cref="T:System.Array"/>, starting at a particular <see cref="T:System.Array"/> index.
		/// </summary>
		/// <param name="array">The one-dimensional <see cref="T:System.Array"/> that is the destination of the elements copied from <see cref="T:System.Collections.ICollection"/>. The <see cref="T:System.Array"/> must have zero-based indexing.</param>
		/// <param name="index">The zero-based index in <paramref name="array"/> at which copying begins.</param>
		/// <exception cref="T:System.ArgumentNullException">
		/// 	<paramref name="array"/> is null. </exception>
		/// <exception cref="T:System.ArgumentOutOfRangeException">
		/// 	<paramref name="index"/> is less than zero. </exception>
		/// <exception cref="T:System.ArgumentException">
		/// 	<paramref name="array"/> is multidimensional.-or- <paramref name="index"/> is equal to or greater than the length of <paramref name="array"/>.-or- The number of elements in the source <see cref="T:System.Collections.ICollection"/> is greater than the available space from <paramref name="index"/> to the end of the destination <paramref name="array"/>. </exception>
		/// <exception cref="T:System.ArgumentException">The type of the source <see cref="T:System.Collections.ICollection"/> cannot be cast automatically to the type of the destination <paramref name="array"/>. </exception>
		public void CopyTo(Array array, int index)
		{
			throw new NotImplementedException();
		}

		/// <summary>
		/// Gets the number of elements contained in the <see cref="T:System.Collections.ICollection"/>.
		/// </summary>
		/// <value></value>
		/// <returns>The number of elements contained in the <see cref="T:System.Collections.ICollection"/>.</returns>
		public int Count
		{
			get { return _properties.Count; }
		}

		/// <summary>
		/// Gets an object that can be used to synchronize access to the <see cref="T:System.Collections.ICollection"/>.
		/// </summary>
		/// <value></value>
		/// <returns>An object that can be used to synchronize access to the <see cref="T:System.Collections.ICollection"/>.</returns>
		public object SyncRoot
		{
			get { return _properties; }
		}

		/// <summary>
		/// Gets a value indicating whether access to the <see cref="T:System.Collections.ICollection"/> is synchronized (thread safe).
		/// </summary>
		/// <value></value>
		/// <returns>true if access to the <see cref="T:System.Collections.ICollection"/> is synchronized (thread safe); otherwise, false.</returns>
		public bool IsSynchronized
		{
			get { return false; }
		}

		/// <summary>
		/// Returns an enumerator that iterates through a collection.
		/// </summary>
		/// <returns>
		/// An <see cref="T:System.Collections.IEnumerator"/> object that can be used to iterate through the collection.
		/// </returns>
		public IEnumerator GetEnumerator()
		{
			return new DictionaryEntryEnumeratorAdapter(_properties.GetEnumerator());
		}

		#region Nested type: DictionaryEntryEnumeratorAdapter

		class DictionaryEntryEnumeratorAdapter : IDictionaryEnumerator
		{
			readonly IDictionaryEnumerator _enumerator;
			KeyValuePair<string, object> _current;

			public DictionaryEntryEnumeratorAdapter(IDictionaryEnumerator enumerator)
			{
				_enumerator = enumerator;
			}

			public object Key
			{
				get { return _current.Key; }
			}

			public object Value
			{
				get { return _current.Value; }
			}

			public DictionaryEntry Entry
			{
				get { return new DictionaryEntry(Key, Value); }
			}

			public bool MoveNext()
			{
				bool moved = _enumerator.MoveNext();

				if (moved)
				{
					_current = (KeyValuePair<string, object>) _enumerator.Current;
				}

				return moved;
			}

			public void Reset()
			{
				_enumerator.Reset();
			}

			public object Current
			{
				get { return new DictionaryEntry(Key, Value); }
			}
		}

		#endregion
	}
}