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

namespace Cryville.Common.Collections.Generic {
	public struct PairCollection : IDisposable {
		public void Dispose() { }
		readonly IPairList _pairList;
		readonly IDictionary _dictionary;
		public PairCollection(object collection) : this() {
			var type = collection.GetType();
			if (typeof(IPairList).IsAssignableFrom(type)) _pairList = (IPairList)collection;
			else if (typeof(IDictionary).IsAssignableFrom(type)) _dictionary = (IDictionary)collection;
			else throw new ArgumentException("Parameter is not a pair collection");
		}
		public void Add(object key, object value) {
			if (_pairList != null) _pairList.Add(key, value);
			else _dictionary.Add(key, value);
		}
	}
	public struct PairCollection<TKey, TValue> : IDisposable {
		public void Dispose() { }
		readonly IPairList<TKey, TValue> _pairList;
		readonly IDictionary<TKey, TValue> _dictionary;
		public PairCollection(object collection) : this() {
			var type = collection.GetType();
			if (typeof(IPairList<TKey, TValue>).IsAssignableFrom(type)) _pairList = (IPairList<TKey, TValue>)collection;
			else if (typeof(IDictionary<TKey, TValue>).IsAssignableFrom(type)) _dictionary = (IDictionary<TKey, TValue>)collection;
			else throw new ArgumentException("Parameter is not a pair collection");
		}
		public void Add(TKey key, TValue value) {
			if (_pairList != null) _pairList.Add(key, value);
			else _dictionary.Add(key, value);
		}
	}
}