// -----------------------------------------
// SoundScribe (TM) and related software.
// 
// Copyright (C) 2007-2011 Vannatech
// http://www.vannatech.com
// All rights reserved.
// 
// This source code is subject to the MIT License.
// http://www.opensource.org/licenses/mit-license.php
//
// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
// AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
// LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
// OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
// THE SOFTWARE.
// -----------------------------------------

using System;
using System.Collections.Generic;
using System.Linq;
using System.Runtime.InteropServices;
using System.Text;
using Microsoft.VisualStudio.TestTools.UnitTesting;
using Vannatech.CoreAudio.Constants;
using Vannatech.CoreAudio.Enumerations;
using Vannatech.CoreAudio.Externals;
using Vannatech.CoreAudio.Interfaces;

namespace CoreAudioTests.Common
{
	/// <summary>
	/// Delegate used to handle a test.
	/// </summary>
	/// <typeparam name="T">The interface type.</typeparam>
	/// <param name="testInterface">The interface instance.</param>
	public delegate void TestReadyDelegate<T>(T testInterface);

	/// <summary>
	/// Base class for all test managers.
	/// </summary>
	/// <typeparam name="T">The interface type.</typeparam>
	public abstract class TestManager<T>
	{
		// Internal collection of disposable items.
		private List<object> _disposables;

		/// <summary>
		/// The method called when a test is ready to be run.
		/// </summary>
		public TestReadyDelegate<T> OnTestReady
		{
			get;
			set;
		}

		/// <summary>
		/// Creats a new instance of the class.
		/// </summary>
		public TestManager()
		{
			_disposables = new List<object>();
		}

		/// <summary>
		/// Ensures that either IDisposable objects or COM objects are properly cleaned up.
		/// </summary>
		/// <param name="disposable">The object to dispose of.</param>
		public void EnsureDisposal(object obj)
		{
			var disposable = obj as IDisposable;
			if(obj != null || (disposable.GetType().Name.Contains("ComObject")))
				_disposables.Add(obj);
		}

		/// <summary>
		/// Begins running the tests.
		/// </summary>
		public void Run()
		{
			if (OnTestReady == null)
				throw new InvalidOperationException("The OnTestReady property must be set");

			try
			{
				OnRun();
			}
			finally
			{
				foreach (var d in _disposables)
				{
					var d2 = d as IDisposable;
					if (d2 != null) d2.Dispose();
					else Marshal.FinalReleaseComObject(d);
				}
			}
		}

		/// <summary>
		/// Method that implements the actual test iteration.
		/// </summary>
		protected abstract void OnRun();
	}
}