package at.gv.egovernment.moa.id.auth.modules.internal.tasks;

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

import org.apache.commons.lang3.BooleanUtils;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.beans.factory.annotation.Qualifier;
import org.springframework.stereotype.Component;

import com.google.common.net.MediaType;

import at.gv.egiz.eaaf.core.api.idp.process.ExecutionContext;
import at.gv.egiz.eaaf.core.exceptions.TaskExecutionException;
import at.gv.egiz.eaaf.core.impl.idp.auth.modules.AbstractAuthServletTask;
import at.gv.egiz.eaaf.core.impl.utils.TransactionIDUtils;
import at.gv.egovernment.moa.id.advancedlogging.MOAIDEventConstants;
import at.gv.egovernment.moa.id.auth.AuthenticationServer;
import at.gv.egovernment.moa.id.auth.data.AuthenticationSessionWrapper;
import at.gv.egovernment.moa.id.auth.exception.WrongParametersException;
import at.gv.egovernment.moa.id.commons.api.exceptions.MOAIDException;
import at.gv.egovernment.moa.logging.Logger;
import at.gv.egovernment.moa.util.StringUtils;

/**
 * Creates a http form including an embedded {@code InfoBoxReadRequest} for reading the identity link.<p/>
 * In detail:
 * <ul>
 * <li>Renames the moa session id.</li>
 * <li>Removes ExecutionContext property {@linkplain at.gv.egovernment.moa.id.commons.MOAIDAuthConstants#PARAM_SESSIONID PARAM_SESSIONID}.</li>
 * <li>Creates the http form mentioned above.</li>
 * <li>Returns the http form via HttpServletResponse.</li>
 * </ul>
 * Expects:
 * <ul>
 * <li>HttpServletRequest parameter {@linkplain at.gv.egovernment.moa.id.commons.MOAIDAuthConstants#PARAM_SESSIONID PARAM_SESSIONID} <strong>or</strong></li>
 * <li>ExecutionContext property {@linkplain at.gv.egovernment.moa.id.commons.MOAIDAuthConstants#PARAM_SESSIONID PARAM_SESSIONID} (in case of legacy authentication without CCE selection, where the moa session is not provided by request parameter).</li>
 * </ul>
 * Result:
 * <ul>
 * <li>The identity link form via HttpServletResponse.</li>
 * </ul>
 * Possible branches:
 * <ul>
 * <li>In case of STORK authentication
 * <ul>
 * <li>Creates STORK auth SAML request.</li>
 * <li>Creates and returns a form for submitting the SAML request to the CPEPS (post binding).</li>
 * <li>Returns the form via HttpServletResponse.</li>
 * </ul>
 * </li>
 * </ul>
 * Code taken from {@link at.gv.egovernment.moa.id.auth.servlet.GenerateIFrameTemplateServlet}.
 * @see #execute(ExecutionContext, HttpServletRequest, HttpServletResponse)
 *
 */
@Component("CreateIdentityLinkFormTask")
public class CreateIdentityLinkFormTask extends AbstractAuthServletTask {

	@Autowired @Qualifier("CitizenCardAuthenticationServer") private AuthenticationServer authServer;
	
	@Override
	public void execute(ExecutionContext executionContext, HttpServletRequest req, HttpServletResponse resp)
			throws TaskExecutionException {		
		try { 
			//execute default task initialization
			AuthenticationSessionWrapper moasession = pendingReq.getSessionData(AuthenticationSessionWrapper.class);
			
	    	//normal MOA-ID authentication
	    	Logger.debug("Starting normal MOA-ID authentication");		    			    	    	
	    	String getIdentityLinkForm = authServer.startAuthentication(moasession, req, pendingReq);	   

			
			if (BooleanUtils.isTrue((Boolean) executionContext.get("useMandate")))
				revisionsLogger.logEvent(pendingReq, MOAIDEventConstants.AUTHPROCESS_MANDATES_REQUESTED);			
				revisionsLogger.logEvent(pendingReq, MOAIDEventConstants.AUTHPROCESS_BKU_URL, moasession.getBkuURL());
				     				
			if (!StringUtils.isEmpty(getIdentityLinkForm)) {
				byte[] content = getIdentityLinkForm.getBytes("UTF-8");
				resp.setContentType(MediaType.HTML_UTF_8.toString());
				resp.setContentLength(content.length);
				resp.getOutputStream().write(content);
				Logger.debug("Finished GET " + CreateIdentityLinkFormTask.class);
				
			}
			
		} catch (WrongParametersException ex) {
			throw new TaskExecutionException(pendingReq, ex.getMessage(), ex);
			
		}

		catch (MOAIDException ex) {
			Logger.info("GetIdentityLink request generation FAILED. Reason:" + ex.getMessage());
			throw new TaskExecutionException(pendingReq, ex.getMessage(), ex);

		} catch (Exception e) {
			Logger.error("CreateIdentityLinkFormTask has an interal Error.", e);
			throw new TaskExecutionException(pendingReq, e.getMessage(), e);

		}

		finally {
			
			TransactionIDUtils.removeTransactionId();
			TransactionIDUtils.removeSessionId();
		}
	}

}