// -----------------------------------------
// 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.Linq;
using CoreAudioTests.Common;
using Microsoft.VisualStudio.TestTools.UnitTesting;
using Vannatech.CoreAudio.Interfaces;
using Vannatech.CoreAudio.Constants;
using System.Collections.Generic;
using Vannatech.CoreAudio.Enumerations;

namespace CoreAudioTests.DeviceTopologyApi
{
	// TODO: Create a custom test manager for IConnector tests, and properly dispose of COM interfaces.

	/// <summary>
	/// Tests all methods of the IConnector interface.
	/// </summary>
	[TestClass]
	public class IConnectorTest
	{
		/// <summary>
		/// Tests that each available connector in the system may be connectors to other connectors.
		/// </summary>
		[TestMethod]
		public void IConnector_ConnectTo()
		{
			int result = 0;
			IEnumerable<IConnector> inputConnectors, outputConnectors;
			ToConnectors(TestUtilities.CreateIPartCollection(), out inputConnectors, out outputConnectors);

			foreach (var cIn in inputConnectors)
			{
				bool isConnected;
				IConnector inOrig = null;
				cIn.IsConnected(out isConnected);

				if (isConnected)
					cIn.GetConnectedTo(out inOrig);

				// New try connection to each output connector
				foreach (var cOut in outputConnectors)
				{
					IConnector outOrig;
					cOut.GetConnectedTo(out outOrig);

					// Start by disconnecting the connectors
					cIn.Disconnect();
					cOut.Disconnect();

					// Connect the input and output
					result = cIn.ConnectTo(cOut);
					AssertCoreAudio.IsHResultOk(result);

					// Verify the connection was made.
					string cInId, idVerify;
					((IPart)cIn).GetGlobalId(out cInId);
					cOut.GetConnectorIdConnectedTo(out idVerify);
					Assert.AreEqual(cInId, idVerify, "The connector IDs do not match.");

					// Return the output connector to original state.
					cOut.Disconnect();
					cOut.ConnectTo(outOrig);
				}

				// Return the input connector to original state.
				cIn.Disconnect();

				if (inOrig != null)
					cIn.ConnectTo(inOrig);
			}
		}

		/// <summary>
		/// Tests that each available connector in the system may be disconnected.
		/// </summary>
		[TestMethod]
		public void IConnector_Disconnect()
		{
			int result = 0;
			IEnumerable<IConnector> allConnectors;
			ToConnectors(TestUtilities.CreateIPartCollection(), out allConnectors);

			foreach (var con in allConnectors)
			{
				bool isConnected;
				IConnector conOrig = null;
				con.IsConnected(out isConnected);

				if (isConnected)
					con.GetConnectedTo(out conOrig);

				result = con.Disconnect();

				// HRESULT should either be S_OK, or E_NOTFOUND
				// E_NOTFOUND is returned when Disconnect method is called on a connector that is already disconnected.
				if (isConnected) AssertCoreAudio.IsHResultOk(result);
				else Assert.AreEqual(TestUtilities.HRESULTS.E_NOTFOUND, (uint)result, "A disconnected connector did not return E_NOTFOUND HRESULT.");

				// Verify connected state is now false.
				con.IsConnected(out isConnected);
				Assert.IsFalse(isConnected, "The connector was not properly disconnected.");

				// Return connector to original state.
				if (conOrig != null)
					con.ConnectTo(conOrig);
			}
		}

		/// <summary>
		/// Tests that the global ID may be received, for each available connector in the system.
		/// </summary>
		[TestMethod]
		public void IConnector_GetConnectorIdConnectedTo()
		{
			int result = 0;
			IEnumerable<IConnector> allConnectors;
			ToConnectors(TestUtilities.CreateIPartCollection(), out allConnectors);

			foreach (var con in allConnectors)
			{
				bool isConnected;
				con.IsConnected(out isConnected);

				if (isConnected)
				{
					IConnector cTo;
					con.GetConnectedTo(out cTo);

					string expectedId, idConTo;
					((IPart)cTo).GetGlobalId(out expectedId);
					result = con.GetConnectorIdConnectedTo(out idConTo);

					AssertCoreAudio.IsHResultOk(result);
					Assert.AreEqual(expectedId, idConTo, "The connected to ID does not match the actual ID of the part.");
				}
			}
		}

		/// <summary>
		/// Tests that the other connector may be received, for each applicable connector in the system.
		/// </summary>
		[TestMethod]
		public void IConnector_GetConnectedTo()
		{
			int result = 0;
			IEnumerable<IConnector> allConnectors;
			ToConnectors(TestUtilities.CreateIPartCollection(), out allConnectors);

			foreach (var con in allConnectors)
			{
				IConnector cTo;
				result = con.GetConnectedTo(out cTo);

				// A result of E_NOTFOUND is valid in this context.
				if ((uint)result == TestUtilities.HRESULTS.E_NOTFOUND) continue;

				// Otherwise the result should be S_OK
				AssertCoreAudio.IsHResultOk(result);
			}
		}

		/// <summary>
		/// Tests that the data flow may be received, for each available connector in the system.
		/// </summary>
		[TestMethod]
		public void IConnector_GetDataFlow()
		{
			int result = 0;
			IEnumerable<IConnector> allConnectors;
			ToConnectors(TestUtilities.CreateIPartCollection(), out allConnectors);

			foreach (var con in allConnectors)
			{
				var valOne = DataFlow.In;
				var valTwo = DataFlow.Out;

				result = con.GetDataFlow(out valOne);
				AssertCoreAudio.IsHResultOk(result);

				result = con.GetDataFlow(out valTwo);
				AssertCoreAudio.IsHResultOk(result);

				Assert.AreEqual(valOne, valTwo, "The data flow was not received.");
			}
		}

		/// <summary>
		/// Tests that the local device ID may be received, for each available connector in the system.
		/// </summary>
		[TestMethod]
		public void IConnector_GetDeviceIdConnectedTo()
		{
			int result = 0;
			IEnumerable<IConnector> allConnectors;
			ToConnectors(TestUtilities.CreateIPartCollection(), out allConnectors);

			foreach (var con in allConnectors)
			{
				bool isConnected;
				con.IsConnected(out isConnected);

				if (isConnected)
				{
					IConnector cTo;
					con.GetConnectedTo(out cTo);

					IDeviceTopology topology;
					((IPart)cTo).GetTopologyObject(out topology);

					string expectedId, devIdConTo;
					topology.GetDeviceId(out expectedId);
					result = con.GetDeviceIdConnectedTo(out devIdConTo);

					AssertCoreAudio.IsHResultOk(result);
					Assert.AreEqual(expectedId, devIdConTo, "The connected to device ID does not match the actual device ID.");
				}
			}
		}

		/// <summary>
		/// Tests that the connector type may be received, for each available connector in the system.
		/// </summary>
		[TestMethod]
		public void IConnector_GetType()
		{
			int result = 0;
			IEnumerable<IConnector> allConnectors;
			ToConnectors(TestUtilities.CreateIPartCollection(), out allConnectors);

			foreach (var con in allConnectors)
			{
				// Try confiming that the type is changed from unknown.
				var cType = ConnectorType.Unknown_Connector;
				result = con.GetType(out cType);
				AssertCoreAudio.IsHResultOk(result);

				if (cType == ConnectorType.Unknown_Connector)
				{
					// If it's still unknown, verify that this is correct.
					var cType2 = ConnectorType.Network;
					con.GetType(out cType2);

					AssertCoreAudio.IsHResultOk(result);
					Assert.AreEqual(ConnectorType.Unknown_Connector, cType2, "The connector type was not received.");
				}
				else
				{
					// The value being changed is enough to verify correctness of the method.
				}
			}
		}

		/// <summary>
		/// Tests that the connected state may be received, for each available connector in the system.
		/// </summary>
		[TestMethod]
		public void IConnector_IsConnected()
		{
			int result = 0;
			IEnumerable<IConnector> allConnectors;
			ToConnectors(TestUtilities.CreateIPartCollection(), out allConnectors);

			foreach (var con in allConnectors)
			{
				var valOne = true;
				var valTwo = false;

				result = con.IsConnected(out valOne);
				AssertCoreAudio.IsHResultOk(result);

				result = con.IsConnected(out valTwo);
				AssertCoreAudio.IsHResultOk(result);

				Assert.AreEqual(valOne, valTwo, "The connected state was not received.");
			}
		}

		#region Helper Methods

		/// <summary>
		/// Takes a collection of IPart objects and returns the subset of the collection that are IConnector objects.
		/// </summary>
		/// <param name="allParts">A collection that may contain both subunits and connectors.</param>
		/// <param name="allConnectors">A collection of connectors contained within the part collection.</param>
		private static void ToConnectors(IEnumerable<IPart> allParts, out IEnumerable<IConnector> allConnectors)
		{
			var cList = new List<IConnector>();
			IEnumerable<IConnector> cIns, cOuts;
			ToConnectors(allParts, out cIns, out cOuts);

			cList.AddRange(cIns);
			cList.AddRange(cIns);

			allConnectors = cList;
		}

		/// <summary>
		/// Takes a collection of IPart objects and returns the subset of the collection that are separated input and output IConnector objects.
		/// </summary>
		/// <param name="allParts">A collection that may contain both subunits and connectors.</param>
		/// <param name="inputConnectors">A collection of input connectors contained within the part collection.</param>
		/// <param name="outputConnectors">A collection of output connectors contained within the part collection.</param>
		private static void ToConnectors(IEnumerable<IPart> allParts, out IEnumerable<IConnector> inputConnectors, out IEnumerable<IConnector> outputConnectors)
		{
			var inList = new List<IConnector>();
			var outList = new List<IConnector>();

			foreach (IPart part in allParts)
			{
				PartType pType;
				part.GetPartType(out pType);

				if (pType == PartType.Connector)
				{
					DataFlow flow;
					var connector = (IConnector)part;
					connector.GetDataFlow(out flow);

					switch (flow)
					{
						case DataFlow.In:
							inList.Add(connector);
							break;

						case DataFlow.Out:
							outList.Add(connector);
							break;
					}
				}
			}

			if (!inList.Any()) Assert.Inconclusive("The test cannot be run properly. No connectors were found.");
			if (!outList.Any()) Assert.Inconclusive("The test cannot be run properly. No connectors were found.");

			inputConnectors = inList;
			outputConnectors = outList;
		}

		#endregion
	}
}