using Sarand.Net.Standard.Base.App;
using Sarand.Net.Standard.Base.Utils;
using System;
using System.Collections.Generic;
using System.Collections.ObjectModel;
using System.Diagnostics;
using System.Text;

namespace Sarand.Net.Standard.Base.Core
{
	//=======================================================================
	public sealed class DisposableCollection<T> : Collection<T>, IDisposable
		where T : class, IDisposable
	{
		//-------------------------------------------------------------------
		// Construction.
		public DisposableCollection() : base() { }
		public DisposableCollection(IList<T> items) : base(items) { }
		public void Dispose()
		{
			while (this.Count > 0)
			{
				// Extract the first item from the list.
				T item = this[0];
				RemoveAt(0);
				try
				{
					if (item != null)
						item.Dispose();
				}
				catch (Exception exc)
				{
					// Ignore exception.
					if (SacsSystem.DebugMode)
					{
						SaLogger.Debug(GetType().Name + ".Dispose " + ExceptionUtil.GetErrorStateMessage(exc));
						Debugger.Break();
					}
				}
			}
		}

		//-------------------------------------------------------------------
		/// <summary>
		/// Add item to the list.
		/// <para>Null items are ignored.</para>
		/// </summary>
		public new void Add(T item)
		{
			if (item != null && !Contains(item))
				base.Add(item);
		}

		/// <summary>
		/// Add list of items to the collection.
		/// <para>Null items are ignored.</para>
		/// <para>Items that can't be cast to the required object type cause a debug break.</para>
		/// </summary>
		public void AddRange<O>(List<O> items) where O : class, IDisposable
		{
			if (items != null && !items.IsEmpty())
			{
				foreach (O item in items)
				{
					if (item == null) continue;
					T obj = item as T;
					if (obj != null)
						Add(obj);
					else if (SacsSystem.DebugMode)
						Debugger.Break();
				}
			}
		}

		//-------------------------------------------------------------------
	}
	//=======================================================================
}