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

namespace UIWidgets
{
	public class DialogActions : IDictionary<string, Func<bool>>, IEnumerable, ICollection<KeyValuePair<string, Func<bool>>>, IEnumerable<KeyValuePair<string, Func<bool>>>
	{
		private List<string> keys = new List<string>();

		private List<Func<bool>> values = new List<Func<bool>>();

		private List<KeyValuePair<string, Func<bool>>> elements = new List<KeyValuePair<string, Func<bool>>>();

		public int Count
		{
			get
			{
				return elements.Count;
			}
		}

		public bool IsReadOnly
		{
			get
			{
				return false;
			}
		}

		public Func<bool> this[string key]
		{
			get
			{
				int index = keys.IndexOf(key);
				return elements[index].Value;
			}
			set
			{
				int index = keys.IndexOf(key);
				elements[index] = new KeyValuePair<string, Func<bool>>(key, value);
			}
		}

		public ICollection<string> Keys
		{
			get
			{
				return elements.Convert(GetKey);
			}
		}

		public ICollection<Func<bool>> Values
		{
			get
			{
				return elements.Convert(GetValue);
			}
		}

		private string GetKey(KeyValuePair<string, Func<bool>> item)
		{
			return item.Key;
		}

		private Func<bool> GetValue(KeyValuePair<string, Func<bool>> item)
		{
			return item.Value;
		}

		public void Add(KeyValuePair<string, Func<bool>> item)
		{
			Add(item.Key, item.Value);
		}

		public void Add(string key, Func<bool> value)
		{
			if (key == null)
			{
				throw new ArgumentNullException("key", "Key is null.");
			}
			if (ContainsKey(key))
			{
				throw new ArgumentException(string.Format("An element with the same key ({0}) already exists.", key));
			}
			keys.Add(key);
			values.Add(value);
			elements.Add(new KeyValuePair<string, Func<bool>>(key, value));
		}

		public void Clear()
		{
			keys.Clear();
			values.Clear();
			elements.Clear();
		}

		public bool Contains(KeyValuePair<string, Func<bool>> item)
		{
			return elements.Contains(item);
		}

		public bool ContainsKey(string key)
		{
			if (key == null)
			{
				throw new ArgumentNullException("key", "Key is null.");
			}
			return keys.Contains(key);
		}

		public void CopyTo(KeyValuePair<string, Func<bool>>[] array, int arrayIndex)
		{
			elements.CopyTo(array, arrayIndex);
		}

		public IEnumerator<KeyValuePair<string, Func<bool>>> GetEnumerator()
		{
			return elements.GetEnumerator();
		}

		IEnumerator IEnumerable.GetEnumerator()
		{
			return elements.GetEnumerator();
		}

		public bool Remove(KeyValuePair<string, Func<bool>> item)
		{
			if (!elements.Contains(item))
			{
				return false;
			}
			int index = elements.IndexOf(item);
			keys.RemoveAt(index);
			values.RemoveAt(index);
			elements.RemoveAt(index);
			return true;
		}

		public bool Remove(string key)
		{
			if (key == null)
			{
				throw new ArgumentNullException("key", "Key is null.");
			}
			if (!ContainsKey(key))
			{
				return false;
			}
			int index = keys.IndexOf(key);
			keys.RemoveAt(index);
			values.RemoveAt(index);
			elements.RemoveAt(index);
			return true;
		}

		public bool TryGetValue(string key, out Func<bool> value)
		{
			if (key == null)
			{
				throw new ArgumentNullException("key", "Key is null.");
			}
			if (!ContainsKey(key))
			{
				value = null;
				return false;
			}
			value = values[keys.IndexOf(key)];
			return true;
		}
	}
}