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

import org.apache.commons.lang.StringEscapeUtils;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Controller;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RequestMethod;

import at.gv.egiz.eaaf.core.api.IRequest;
import at.gv.egiz.eaaf.core.api.IRequestStorage;
import at.gv.egiz.eaaf.core.api.data.EAAFConstants;
import at.gv.egiz.eaaf.core.api.gui.IGUIFormBuilder;
import at.gv.egiz.eaaf.core.impl.idp.controller.AbstractController;
import at.gv.egiz.eaaf.core.impl.utils.HTTPUtils;
import at.gv.egovernment.moa.id.auth.frontend.builder.AbstractServiceProviderSpecificGUIFormBuilderConfiguration;
import at.gv.egovernment.moa.id.auth.frontend.builder.SPSpecificGUIBuilderConfigurationWithDBLoad;
import at.gv.egovernment.moa.id.commons.MOAIDConstants;
import at.gv.egovernment.moa.id.commons.api.AuthConfiguration;
import at.gv.egovernment.moa.logging.Logger;
import at.gv.egovernment.moa.util.MiscUtil;

/**
 * @author tlenz
 *
 */
@Controller
public class GUILayoutBuilderServlet extends AbstractController {

	public static final String ENDPOINT_CSS = "/css/buildCSS";
	public static final String ENDPOINT_JS = "/js/buildJS";
	public static final String ENDPOINT_BKUDETECTION = "/feature/bkuDetection";
	
	@Autowired AuthConfiguration authConfig;
	@Autowired IRequestStorage requestStoreage;
	@Autowired IGUIFormBuilder formBuilder;
	
	public GUILayoutBuilderServlet() {
		super();
		Logger.debug("Registering servlet " + getClass().getName() 
				+ " with mappings '" + ENDPOINT_CSS 
				+ "' and '" + ENDPOINT_JS + "'.");
		
	}
	
	@RequestMapping(value = ENDPOINT_BKUDETECTION, method = {RequestMethod.GET})
	public void buildBkuDetectionFrame(HttpServletRequest req, HttpServletResponse resp) throws IOException {		
		try {
			IRequest pendingReq = extractPendingRequest(req);
			
			//initialize GUI builder configuration
			AbstractServiceProviderSpecificGUIFormBuilderConfiguration config = null;
			if (pendingReq != null) 
				config = new SPSpecificGUIBuilderConfigurationWithDBLoad(
						pendingReq, 
						SPSpecificGUIBuilderConfigurationWithDBLoad.VIEW_TEMPLATE_BKUDETECTION_SP_SPECIFIC, 
						null);
			
			else {
				config = new SPSpecificGUIBuilderConfigurationWithDBLoad(
						HTTPUtils.extractAuthURLFromRequest(req), 
						SPSpecificGUIBuilderConfigurationWithDBLoad.VIEW_TEMPLATE_BKUDETECTION_GENERIC, 
						null);
				config.setTemplateClasspahtDir(
						SPSpecificGUIBuilderConfigurationWithDBLoad.VIEW_TEMPLATE_MAINGUI_DIRECTORY);
				
			}
		
			//build GUI component
			formBuilder.build(resp, config, MOAIDConstants.DEFAULT_CONTENT_TYPE_HTML_UTF8, "BKUDetection-Frame");
			
			
		} catch (Exception e) {
			Logger.warn("GUI ressource:'BKUDetection' generation FAILED.", e);
			resp.sendError(HttpServletResponse.SC_INTERNAL_SERVER_ERROR, "Created resource failed");
			
		}
		
	}
	
	@RequestMapping(value = "/css/buildCSS", method = {RequestMethod.GET})
	public void buildCSS(HttpServletRequest req, HttpServletResponse resp) throws IOException {		
		try {
			IRequest pendingReq = extractPendingRequest(req);
		
			//initialize GUI builder configuration
			SPSpecificGUIBuilderConfigurationWithDBLoad config = null;
			if (pendingReq != null) 
				config = new SPSpecificGUIBuilderConfigurationWithDBLoad(
						pendingReq, 
						SPSpecificGUIBuilderConfigurationWithDBLoad.VIEW_TEMPLATE_CSS, 
						null);
			
			else
				config = new SPSpecificGUIBuilderConfigurationWithDBLoad(
						HTTPUtils.extractAuthURLFromRequest(req), 
						SPSpecificGUIBuilderConfigurationWithDBLoad.VIEW_TEMPLATE_CSS, 
						null);
		
			//build GUI component
			formBuilder.build(resp, config, "text/css; charset=UTF-8", "CSS-Form");
			
		} catch (Exception e) {
			Logger.warn("GUI ressource:'CSS' generation FAILED.", e);
			resp.sendError(HttpServletResponse.SC_INTERNAL_SERVER_ERROR, "Created resource failed");
		}
							
	}
	
	@RequestMapping(value = "/js/buildJS", method = {RequestMethod.GET})
	public void buildJavaScript(HttpServletRequest req, HttpServletResponse resp) throws IOException {
		try {
			IRequest pendingReq = extractPendingRequest(req);
		
			//initialize GUI builder configuration
			SPSpecificGUIBuilderConfigurationWithDBLoad config = null;
			if (pendingReq != null) 
				config = new SPSpecificGUIBuilderConfigurationWithDBLoad(
						pendingReq, 
						SPSpecificGUIBuilderConfigurationWithDBLoad.VIEW_TEMPLATE_JS, 
						GeneralProcessEngineSignalController.ENDPOINT_BKUSELECTION_EVALUATION);
			
			else
				config = new SPSpecificGUIBuilderConfigurationWithDBLoad(
						HTTPUtils.extractAuthURLFromRequest(req), 
						SPSpecificGUIBuilderConfigurationWithDBLoad.VIEW_TEMPLATE_JS, 
						GeneralProcessEngineSignalController.ENDPOINT_BKUSELECTION_EVALUATION);
		
			//build GUI component
			formBuilder.build(resp, config, "text/javascript; charset=UTF-8", "JavaScript");
			
		} catch (Exception e) {
			Logger.warn("GUI ressource:'JavaScript' generation FAILED.", e);
			resp.sendError(HttpServletResponse.SC_INTERNAL_SERVER_ERROR, "Created resource failed");
		}
						
	}
	
	private IRequest extractPendingRequest(HttpServletRequest req) {
		try {		
			String pendingReqID = StringEscapeUtils.escapeHtml(
					req.getParameter(EAAFConstants.PARAM_HTTP_TARGET_PENDINGREQUESTID));
		
			if (MiscUtil.isNotEmpty(pendingReqID)) {		
				IRequest pendingReq = requestStorage.getPendingRequest(pendingReqID);
				if (pendingReq != null) {
					Logger.trace("GUI-Layout builder: Pending-request:"
							+ pendingReqID + " found -> Build specific template");
					return pendingReq;
					
				}			
			}
			
			Logger.trace("GUI-Layout builder: No pending-request found -> Use default templates");
			
		} catch (Exception e) {
			Logger.warn("GUI-Layout builder-servlet has an error during request-preprocessing.", e);
			
		}	
		
		return null;
	}
}