/*******************************************************************************
 *  Copyright 2017-2018 Centre for Development of Advanced Computing(C-DAC), Pune
 *  
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *  
 *   http://www.apache.org/licenses/LICENSE-2.0
 *  
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 *******************************************************************************/
package cdac.medinfo.sdk.dcm30_04.services.cservices.testcases.scu;
import cdac.medinfo.sdk.dcm30_04.utils.DicomConstants;


import java.io.IOException;


import cdac.medinfo.sdk.dcm30_04.enums.EnumLoggingLevel;
import cdac.medinfo.sdk.dcm30_04.enums.EnumPDUType;

import cdac.medinfo.sdk.dcm30_04.services.association.AReleaseRQorRP;
import cdac.medinfo.sdk.dcm30_04.services.association.AssociateRQ;
import cdac.medinfo.sdk.dcm30_04.services.association.DefaultAssociation;
import cdac.medinfo.sdk.dcm30_04.services.cecho.commons.CEchoRQ;
import cdac.medinfo.sdk.dcm30_04.services.cecho.commons.CEchoRSP;
import cdac.medinfo.sdk.dcm30_04.services.cecho.scu.CEchoSCU;
import cdac.medinfo.sdk.dcm30_04.services.dicomnetcommons.EnumServiceType;
import cdac.medinfo.sdk.dcm30_04.services.dimsecommons.DicomMessage;
import cdac.medinfo.sdk.dcm30_04.services.dimsecommons.IAsyncReceiver;
import cdac.medinfo.sdk.dcm30_04.services.scu.commons.SCUSession;
import cdac.medinfo.sdk.dcm30_04.utils.DicomConfig;
import cdac.medinfo.sdk.dcm30_04.utils.ISingleCollection;
import cdac.medinfo.sdk.dcm30_04.utils.SingleCollection;

/**
 * This class is implemented to test the C-Echo SCU in Asynchronous Mode.
 * In Asynchronous Mode SCU sends multiple service request to SCP without waiting for the Response.
 * To implement C-Echo SCU in Asynchronous mode user needs to implement interface IAsyncReceiver and should give 
 * implementation of onResponseReceive() and getNoOfRemainingResponses() method.
 * The IAsyncReceiver should be added  to SCU session to receive the response. Whenever a response 
 * is received by SCU Session, call back is made on onResponseReceive() method of the test code.
 * 
 * In order to run the following class , please refer to this link($Link) to create the environment.
 * To implement an SCU of a particular we need to do the following things:
 * Create the SCUSession object which maintains the current session of the SCU. Its "start" method accepts
 * the SCP's IP Address and Port and tries to establish a connection with the SCP. 
 * Next step is to establish association with SCP. Some ways to create an Association Request: 
 * 1) Use Default Association class to Load the association for requested service. User can load the association 
 * by specifying the Service Type in loadAssociation method of Default association. For e.g. here EnumServiceType.CECHO
 * should be specified to load Association for C-Echo Services.
 * 2) Manually create object of AssociationRQ class and set all presentation contexts collection on it. 
 * More details provided in the API DOCS of AssociationRQ class.
 * Use SCUSession object to send the Association-RQ which makes a blocking call and waits until the Associate Response is received.
 * After successful association is established the SCUSession stores the status of the Association with it.  
 * 
 * Create CEchoSCU object to send the C-Echo Request to the respective SCP. The "sendMessage" method 
 * of the CEchoSCU would not wait after sending the C-Echo-RQ. This operation is part of ASynchronous mode request handling.
 * All the request are sent to the SCP without waiting for the response to arrive. As the request are processed at the SCP
 * the response is received by the SCU. The onResponsereceiveMethod() of IAsyncReceiver is called back each time
 * response is received by SCU.
 *  
 * Once the DIMSE response is received by the Test Code it stores the DIMSE response into its collection.
 * 
 * After this, create a A-Release-RQ in order to request for association release and send it using the
 * SCUSession object. This again is a blocking call and the SCUSession waits until a A-Release-RP is received.
 * 
 * At the end of an operation calling "close" on SCUSession would disconnect the connection made with the 
 * SCP and release all the acquired resources.
 * Instead of closing the session after a C-Echo operation is complete,we can create another association
 * and send more requests. 
 * Also it is possible to create multiple C-Echo-RQs and send them one by one on the same Association.
 */
public class CEcho_SCU_Async implements IAsyncReceiver
{

	//Current SCU Session
	SCUSession objSession;

	//Collection containing C-Echo Response.
	ISingleCollection<DicomMessage> cEchoRespCollection = new SingleCollection<DicomMessage>();

	//Count variable
	int count =1;

	/**
	 * This function performs the C-Echo operation.
	 */
	public void start()
	{
		try
		{
			//Create SCUSession object
			objSession = new SCUSession();
			
			/*
			 * Setting time out as 5000 milli second. It will wait 5000 mili seconds for read and write operation.
			 * If in the time specified (5000 ms) read or write operation is not performed then 
			 * session is time out.
			 */ 
			objSession.setTimeOut(5000);

			//Add test code as Async Receiver to get the response.  
			objSession.addAsyncReceiver(this);

			/*
			 * Initializing selected services and loading default association
			 */
			EnumServiceType[] arrenumServiceType = new EnumServiceType[1];
			arrenumServiceType[0] = EnumServiceType.CECHO;
			DefaultAssociation objDefaultAssociation = new DefaultAssociation("SDK");
			objDefaultAssociation.loadAssociation(arrenumServiceType);

			/*
			 * Set Maximum no of Operations Invoked and Performed to 0 for Asynchronous behavior.
			 */
			objDefaultAssociation.getRQUserInfo().setMaxNumOpsInvoked((short)0);
			objDefaultAssociation.getRQUserInfo().setMaxNumOpsPerformed((short)0);

			//Create Association RQ
			AssociateRQ objAssociateRQ = objDefaultAssociation.getAssociationRQ("SDK");

			/*
			 * Start SCU Session.
			 */
			objSession.start("192.168.8.94", 9000);

			/*
			 * Create C-Echo SCU.
			 */
			CEchoSCU objCEchoSCU = new CEchoSCU(objSession);

			/*
			 * Send the Association Request.
			 */
			if(objSession.sendAssociationMessage(objAssociateRQ))
			{	
				//When association is successfully established the "objSession.sendAssociationMessage()"
				//method returns true.
				System.out.println("Association established");

				for(int i=0;i<20;i++)
				{
					//Create Default CEchoRQ . This method uses
					// default values for the attributes in the request. These attributes can be
					//modified once the request object is created, before sending.
					CEchoRQ objCEchoRQ = CEchoRQ.getDefaultRQ(DicomConstants.DCM_VERIFICATION_SOP_CLASS);


					System.out.println("CEcho Request initialized");

					//Send the C-Echo-RQ .
					//In async mode all the C-Echo request is sent without waiting 
					//for response.When the response is received then onResponseReceived method is called.
					if(objCEchoSCU.sendMessage(objCEchoRQ))
					{
						System.out.println("CEcho Response received");
					}
					else
					{
						System.out.println("C-Echo request cannot be sent");
					}
				}

				//Create A-Release-RQ to release the association
				AReleaseRQorRP objAReleaseRQorRP = new AReleaseRQorRP(EnumPDUType.RELEASE_RQ);

				//When successful A-Release-RP is received, close the Session.
				//Please note that instead of closing the session we can create 
				//another association and send more requests. Also it is possible
				//to create multiple C-Echo-RQs and send them one by one.
				if(objSession.sendAssociationMessage(objAReleaseRQorRP))
				{
					System.out.println("Associaiton is released");
					objSession.close();
				}
			}
			else
		    {
				System.out.println("Associaiton cannot be established");
				objSession.close();
		    }
		}
		catch(Exception e)
		{
			e.printStackTrace();
			objSession.close();
		}
	}


	/**
	 * Gets the no of remaining responses.
	 * @return int
	 */
	public int getNoOfRemainingResponses() 
	{
		return objSession.getNumberOfRequestSend() - cEchoRespCollection.size();
	}

	/**
	 * This method is call backed when Response is received.
	 * @param response  Response received.
	 */
	public void onResponseReceive(DicomMessage response) throws IOException
	{
		System.out.println("Response received ..............................................." + count++);
		cEchoRespCollection.add(response);
		CEchoRSP objCEchoRSP = new CEchoRSP(response);
		System.out.println("C-Echo Response Status is :" + objCEchoRSP.getStatus());
	}

	public static void main(String[] args)
	{
		DicomConfig objDicomConfig = DicomConfig.createInstance();

		//enable logging,specify the path of the directory where log files are created.
		//User can specify any directory in place of 'c:\DCM_Logs'.
		//If no directory is defined by user to create logs then it is created in User Temp DIR.
		objDicomConfig.enableLogging(EnumLoggingLevel.INFO, "C:\\DCM_Logs");

		CEcho_SCU_Async objTestAsyncCEchoSCU = new CEcho_SCU_Async();
		objTestAsyncCEchoSCU.start();
	}
}
