using System;

using System.Collections.Generic;

using System.Linq;

using System.Text;

using System.ComponentModel;

using System.Diagnostics;



namespace Microsoft.Research.DynamicDataDisplay

{

	public sealed class ValueStore : CustomTypeDescriptor, INotifyPropertyChanged

	{

		public ValueStore(params string[] propertiesNames)

		{

			foreach (var propertyName in propertiesNames)

			{

				this[propertyName] = "";

			}

		}



		private Dictionary<string, object> cache = new Dictionary<string, object>();



		public object this[string propertyName]

		{

			get { return cache[propertyName]; }

			set { SetValue(propertyName, value); }

		}



		public ValueStore SetValue(string propertyName, object value)

		{

			cache[propertyName] = value;

			PropertyChanged.Raise(this, propertyName);



			return this;

		}



		private PropertyDescriptorCollection collection;

		public override PropertyDescriptorCollection GetProperties()

		{

			PropertyDescriptor[] propertyDescriptors = new PropertyDescriptor[cache.Count];

			var keys = cache.Keys.ToArray();

			for (int i = 0; i < keys.Length; i++)

			{

				propertyDescriptors[i] = new ValueStorePropertyDescriptor(keys[i]);

			}



			collection = new PropertyDescriptorCollection(propertyDescriptors);

			return collection;

		}



		private sealed class ValueStorePropertyDescriptor : PropertyDescriptor

		{

			private readonly string name;



			public ValueStorePropertyDescriptor(string name)

				: base(name, null)

			{

				this.name = name;

			}



			public override bool CanResetValue(object component)

			{

				return false;

			}



			public override Type ComponentType

			{

				get { return typeof(ValueStore); }

			}



			public override object GetValue(object component)

			{

				ValueStore store = (ValueStore)component;

				return store[name];

			}



			public override bool IsReadOnly

			{

				get { return false; }

			}



			public override Type PropertyType

			{

				get { return typeof(string); }

			}



			public override void ResetValue(object component)

			{

			}



			public override void SetValue(object component, object value)

			{

			}



			public override bool ShouldSerializeValue(object component)

			{

				return false;

			}

		}



		#region INotifyPropertyChanged Members



		public event PropertyChangedEventHandler PropertyChanged;



		#endregion

	}

}