/*
 * 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.frontend.builder;

import java.io.File;
import java.io.FileInputStream;
import java.io.InputStream;
import java.net.URI;

import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;

import at.gv.egiz.eaaf.core.api.gui.IVelocityGUIBuilderConfiguration;
import at.gv.egiz.eaaf.core.exceptions.GUIBuildException;
import at.gv.egiz.eaaf.core.impl.gui.AbstractVelocityGUIFormBuilderImpl;
import at.gv.egovernment.moa.id.commons.api.AuthConfiguration;
import at.gv.egovernment.moa.logging.Logger;

/**
 * @author tlenz 
 *
 */
@Service("guiFormBuilder")
public class GUIFormBuilderImpl extends AbstractVelocityGUIFormBuilderImpl {
	

	private static final String CONFIG_HTMLTEMPLATES_DIR = "htmlTemplates/";
	private static final String CLASSPATH_HTMLTEMPLATES_DIR = "templates/";
			
	@Autowired private AuthConfiguration authConfig;

	public GUIFormBuilderImpl() throws GUIBuildException {
		super();
		
	}
				
	@Override
	protected InputStream getInternalTemplate(IVelocityGUIBuilderConfiguration config) throws GUIBuildException {
		String viewName = config.getViewName();
		
		//load specific template
		InputStream is = config.getTemplate(viewName);
		
		if (is == null) {
			//load template from default resources
			try {							
				Logger.trace("Loading GUI template:" + viewName + " from default resources ... ");			
				String pathLocation = null;
				try {
					//load template from config directory
					String rootconfigdir = authConfig.getRootConfigFileDir();
					pathLocation = rootconfigdir + CONFIG_HTMLTEMPLATES_DIR + 
							viewName;
					File file = new File(new URI(pathLocation));
					is = new  FileInputStream(file);
										
				} catch (Exception e) {
					//load template from classpath as backup
					Logger.debug("GUI template:" + viewName + " is not found in configuration directory. "
							+ " Load template from project library ... ");					
					try  {
						pathLocation = super.getInternalClasspathTemplateDir(config, CLASSPATH_HTMLTEMPLATES_DIR) + viewName;
						is = Thread.currentThread()
								.getContextClassLoader()
								.getResourceAsStream(pathLocation);				
												
					} catch (Exception e1) {
						Logger.error("GUI template:" + pathLocation + " is NOT loadable!", e);
						throw new GUIBuildException("GUI template:" + pathLocation + " is NOT loadable!", e);
						
					}					
				} 
				
			} catch (GUIBuildException e) {
				throw e;
				
			} catch (Exception e) {
				Logger.error("GUI builder has an internal error during template load operation", e);
				throw new GUIBuildException("GUI builder has an internal error during template load operation", e);
				
			}
		}
		
		return is;
		
	}
	
}