/*
 * Copyright 2015-Present Entando Inc. (http://www.entando.com) All rights reserved.
 *
 * This library is free software; you can redistribute it and/or modify it under
 * the terms of the GNU Lesser General Public License as published by the Free
 * Software Foundation; either version 2.1 of the License, or (at your option)
 * any later version.
 *
 * This library is distributed in the hope that it will be useful, but WITHOUT
 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
 * FOR A PARTICULAR PURPOSE. See the GNU Lesser General Public License for more
 * details.
 */
package org.entando.entando.aps.system.services.controller.executor;

import com.agiletec.aps.system.RequestContext;
import com.agiletec.aps.system.SystemConstants;
import com.agiletec.aps.system.services.page.IPage;
import com.agiletec.aps.system.services.pagemodel.PageModel;

import freemarker.template.Template;

import java.io.IOException;
import java.io.StringReader;
import javax.servlet.RequestDispatcher;
import javax.servlet.ServletException;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;

import org.apache.commons.lang.StringUtils;

import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

/**
 * @author E.Santoboni
 */
public class PageExecutorService implements ExecutorServiceInterface {
	
	private static final Logger _logger = LoggerFactory.getLogger(PageExecutorService.class);
	
	@Override
	public void afterPropertiesSet() throws Exception {
		//nothing to do
	}
	
	@Override
	public void service(RequestContext reqCtx) {
		HttpServletRequest request = reqCtx.getRequest();
		HttpServletResponse response = reqCtx.getResponse();
		try {
			if (response.isCommitted()) {
				return;
			}
			IPage page = (IPage) reqCtx.getExtraParam(SystemConstants.EXTRAPAR_CURRENT_PAGE);
			PageModel model = page.getModel();
			if (StringUtils.isBlank(model.getTemplate())) {
				String jspPath = model.getPageModelJspPath();
				RequestDispatcher dispatcher = request.getSession().getServletContext().getRequestDispatcher(jspPath);
				dispatcher.forward(request, response);
			} else {
				ExecutorBeanContainer ebc = (ExecutorBeanContainer) reqCtx.getExtraParam(SystemConstants.EXTRAPAR_EXECUTOR_BEAN_CONTAINER);
				Template template = new Template(page.getCode(), new StringReader(model.getTemplate()), ebc.getConfiguration());
				try {
					template.process(ebc.getTemplateModel(), response.getWriter());
				} catch (Throwable t) {
					String msg = "Error detected while including a page model " + model.getCode();
					_logger.error(msg, t);
					throw new RuntimeException(msg, t);
				}
			}
		} catch (ServletException e) {
			String msg = "Error detected while including a page model";
			_logger.error(msg, e);
			throw new RuntimeException(msg, e);
		} catch (IOException e) {
			String msg = "IO error detected while including the page model";
			_logger.error(msg, e);
			throw new RuntimeException(msg, e);
		}
	}
	
}