/*
 * 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.modules.ssotransfer.utils;

import java.io.ByteArrayOutputStream;
import java.io.IOException;

import javax.crypto.spec.DHPublicKeySpec;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;

import com.google.gson.JsonObject;

import at.gv.egiz.eaaf.core.api.data.EAAFConstants;
import at.gv.egiz.eaaf.core.api.gui.IGUIFormBuilder;
import at.gv.egiz.eaaf.core.exceptions.GUIBuildException;
import at.gv.egovernment.moa.id.auth.frontend.builder.DefaultGUIFormBuilderConfiguration;
import at.gv.egovernment.moa.id.auth.modules.ssotransfer.SSOTransferConstants;
import at.gv.egovernment.moa.id.commons.api.exceptions.ConfigurationException;
import at.gv.egovernment.moa.logging.Logger;
import at.gv.egovernment.moa.util.Base64Utils;
import at.gv.egovernment.moa.util.MiscUtil;
import net.glxn.qrgen.QRCode;
import net.glxn.qrgen.image.ImageType;

/**
 * @author tlenz
 *
 */
public class GUIUtils {		
	public static final int REFESH_TIMEOUT = 5 * 1000; //5 sec
	
	public static void buildSSOTransferGUI(
			IGUIFormBuilder guiBuilder, HttpServletRequest httpReq,HttpServletResponse httpResp,
			String authURL, String pendingReqID) throws ConfigurationException, IOException {
		buildSSOTransferGUI(guiBuilder, httpReq, httpResp, authURL, pendingReqID, null, null);
				
	}

	/**
	 * @param guiBuilder
	 * @param response
	 * @param authURL
	 * @param requestID
	 * @param nonce
	 * @param dhKeyIDP
	 * @throws ConfigurationException 
	 * @throws IOException 
	 */
	public static void buildSSOTransferGUI(IGUIFormBuilder guiBuilder, HttpServletRequest request, HttpServletResponse response, String authURL,
			String requestID, String nonce, DHPublicKeySpec dhKeyIDP) throws ConfigurationException, IOException {
		try {
			String containerURL = authURL
					+ SSOTransferConstants.SERVLET_SSOTRANSFER_FROM_SMARTPHONE
					+ "?" + EAAFConstants.PARAM_HTTP_TARGET_PENDINGREQUESTID + "=" + requestID;
		
			
			
			
			JsonObject qrResult = new JsonObject();
			qrResult.addProperty(SSOTransferConstants.SSOCONTAINER_KEY_TYPE, 
					SSOTransferConstants.SSOCONTAINER_VALUE_TYPE_TRANSER);
			qrResult.addProperty(SSOTransferConstants.SSOCONTAINER_KEY_URL, containerURL);
			
			if (MiscUtil.isNotEmpty(nonce))
				qrResult.addProperty(SSOTransferConstants.SSOCONTAINER_KEY_NONCE, nonce);

			if (dhKeyIDP != null) {
				qrResult.addProperty(SSOTransferConstants.SSOCONTAINER_KEY_DH_PUBKEY, 
						Base64Utils.encode(dhKeyIDP.getY().toByteArray()));
				qrResult.addProperty(SSOTransferConstants.SSOCONTAINER_KEY_DH_PRIME, 
						Base64Utils.encode(dhKeyIDP.getP().toByteArray()));
				qrResult.addProperty(SSOTransferConstants.SSOCONTAINER_KEY_DH_GENERATOR, 
						Base64Utils.encode(dhKeyIDP.getG().toByteArray()));
				
			}
			
			ByteArrayOutputStream qrStream = 
					QRCode.from(qrResult.toString()).to(ImageType.GIF).withSize(350, 350).stream();							
			String base64EncodedImage = Base64Utils.encode(qrStream.toByteArray());
					
			DefaultGUIFormBuilderConfiguration config = new DefaultGUIFormBuilderConfiguration(
					authURL, 
					DefaultGUIFormBuilderConfiguration.VIEW_SSO_SESSION_TRANSFER, 
					null);
			
			config.putCustomParameter(null, "QRImage", base64EncodedImage);		
			config.putCustomParameterWithOutEscaption(null, "successMsg", "Select the SSO Session in your <i>SSO-Transfer App</i> and scan the QR-Code to start the process.");			
			config.putCustomParameterWithOutEscaption(null, "timeoutURL", containerURL);
			config.putCustomParameter(null, "timeout", String.valueOf(REFESH_TIMEOUT));
				
			guiBuilder.build(request, response, config, "SSO-Transfer-Module");
			
		} catch (GUIBuildException e) {
			Logger.warn("Can not build GUI:'BKU-Selection'. Msg:" + e.getMessage(), e);
			throw new ConfigurationException("builder.09", new Object[]{e.getMessage()}, e);
			
		}
		
	}		
}