/*******************************************************************************
 * Copyright 2014 Federal Chancellery Austria
 * MOA-ID has been developed in a cooperation between BRZ, the Federal
 * Chancellery Austria - ICT staff unit, and Graz University of Technology.
 * 
 * Licensed under the EUPL, Version 1.1 or - as soon they will be approved by
 * the European Commission - subsequent versions of the EUPL (the "Licence");
 * You may not use this work except in compliance with the Licence.
 * You may obtain a copy of the Licence at:
 * http://www.osor.eu/eupl/
 * 
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the Licence is distributed on an "AS IS" basis,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the Licence for the specific language governing permissions and
 * limitations under the Licence.
 * 
 * This product combines work with different licenses. See the "NOTICE" text
 * file for details on the various modules and licenses.
 * The "NOTICE" text file is part of the distribution. Any derivative works
 * that you distribute must include a readable copy of the "NOTICE" text file.
 ******************************************************************************/
package at.gv.egovernment.moa.id.auth.servlet;

import java.io.IOException;
import java.util.Enumeration;

import javax.servlet.ServletException;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;

import org.apache.commons.lang.StringEscapeUtils;

import at.gv.egovernment.moa.id.auth.MOAIDAuthConstants;
import at.gv.egovernment.moa.id.auth.data.AuthenticationSession;
import at.gv.egovernment.moa.id.auth.exception.MOAIDException;
import at.gv.egovernment.moa.id.auth.exception.WrongParametersException;
import at.gv.egovernment.moa.id.auth.modules.TaskExecutionException;
import at.gv.egovernment.moa.id.auth.modules.registration.ModuleRegistration;
import at.gv.egovernment.moa.id.commons.db.ex.MOADatabaseException;
import at.gv.egovernment.moa.id.process.ExecutionContextImpl;
import at.gv.egovernment.moa.id.process.ProcessExecutionException;
import at.gv.egovernment.moa.id.process.api.ExecutionContext;
import at.gv.egovernment.moa.id.storage.AuthenticationSessionStoreage;
import at.gv.egovernment.moa.logging.Logger;
import at.gv.egovernment.moa.util.MiscUtil;

public class GenerateIFrameTemplateServlet extends AuthServlet {

	private static final long serialVersionUID = 1L;

	protected void doGet(HttpServletRequest req, HttpServletResponse resp)
			throws ServletException, IOException {
		Logger.debug("Receive " + GenerateIFrameTemplateServlet.class + " Request");

    	String pendingRequestID = null;
		
	    try {
	    	String moasessionid = req.getParameter(MOAIDAuthConstants.PARAM_SESSIONID);	    		    
	    	moasessionid = StringEscapeUtils.escapeHtml(moasessionid);	    	
	    	AuthenticationSession moasession = null;	    	
	    	try {	    		
	    	    pendingRequestID = AuthenticationSessionStoreage.getPendingRequestID(moasessionid);			
	    	    moasession = AuthenticationSessionStoreage.getSession(moasessionid);
	    	    			
			} catch (MOADatabaseException e) {
				Logger.info("MOASession with SessionID="+ moasessionid + " is not found in Database");
				throw new MOAIDException("init.04", new Object[] {
						moasessionid});
				
			} catch (Throwable e) {
				Logger.info("No HTTP Session found!");
				throw new MOAIDException("auth.18", new Object[] {});
			}
	    	


			ExecutionContext ec = new ExecutionContextImpl();
			// set execution context			
			Enumeration<String> reqParamNames = req.getParameterNames();
			while(reqParamNames.hasMoreElements()) {
				String paramName = reqParamNames.nextElement();
				if (MiscUtil.isNotEmpty(paramName))
					ec.put(paramName, req.getParameter(paramName));
				
			}
			
			ec.put("pendingRequestID", pendingRequestID);
			ec.put(MOAIDAuthConstants.PARAM_SESSIONID, moasessionid);
			
//	    	String bkuid = req.getParameter(MOAIDAuthConstants.PARAM_BKU);
//	    	String useMandate = req.getParameter(MOAIDAuthConstants.PARAM_USEMANDATE);
//	    	String ccc = req.getParameter(MOAIDAuthConstants.PARAM_CCC);
//			ec.put("ccc", moasession.getCcc());
//			ec.put("useMandate", moasession.getUseMandate());
//			ec.put("bkuURL", moasession.getBkuURL());
			
			// select and create process instance
			String processDefinitionId = ModuleRegistration.getInstance().selectProcess(ec);
			if (processDefinitionId == null) {
				Logger.warn("No suitable process found for SessionID " + moasession.getSessionID());
				throw new MOAIDException("process.02", new Object[] { moasession.getSessionID() });
			}			
			
			String processInstanceId = getProcessEngine().createProcessInstance(processDefinitionId, ec);

			// keep process instance id in moa session
			moasession.setProcessInstanceId(processInstanceId);

			// make sure moa session has been persisted before running the process
			try {
				AuthenticationSessionStoreage.storeSession(moasession);
			} catch (MOADatabaseException e) {
				Logger.error("Database Error! MOASession is not stored!");
				throw new MOAIDException("init.04", new Object[] { moasession.getSessionID() });
			}

			Logger.info("BKU is selected -> Start BKU communication ...");
			
			// start process
			getProcessEngine().start(processInstanceId);

		}
	    catch (WrongParametersException ex) {
	    	handleWrongParameters(ex, req, resp);
	    }
	          
	    catch (MOAIDException ex) {
	    	handleError(null, ex, req, resp, pendingRequestID);

	    } catch (ProcessExecutionException e) {
			Throwable cause = e.getCause();
			if (cause != null && cause instanceof TaskExecutionException) {
				Throwable taskCause = cause.getCause();
				if (taskCause != null && taskCause instanceof WrongParametersException) {
					WrongParametersException internalEx = (WrongParametersException) taskCause;
					handleWrongParameters(internalEx, req, resp);
					return;
					
				} else if (taskCause != null && taskCause instanceof MOAIDException) {
					MOAIDException moaTaskCause = (MOAIDException) taskCause;
					handleError(null, moaTaskCause, req, resp, pendingRequestID);
					return;
					
				}									
			} 
			
			Logger.error("BKUSelectionServlet has an interal Error.", e);				    	
	    	
	    } catch (Exception e) {
	    	Logger.error("BKUSelectionServlet has an interal Error.", e);
	    	
	    }
	       	    
	    finally {
	    	
	    }
	}

	
	
	
	
	
	
	

}