/*
 * 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.FileNotFoundException;
import java.io.InputStream;
import java.net.MalformedURLException;
import java.net.URI;
import java.net.URISyntaxException;
import java.net.URL;

import at.gv.egiz.eaaf.core.api.IRequest;
import at.gv.egiz.eaaf.core.impl.utils.FileUtils;
import at.gv.egovernment.moa.logging.Logger;
import at.gv.egovernment.moa.util.MiscUtil;

/**
 * @author tlenz
 *
 */
public class SPSpecificGUIBuilderConfigurationWithFileSystemLoad extends AbstractServiceProviderSpecificGUIFormBuilderConfiguration {
	
	private String configKeyIdentifier = null;
	private String configRootContextDir = null;
	
	/**
	 * @param authURL PublicURLPrefix of the IDP but never null
	 * @param viewName Name of the template (with suffix) but never null
	 * @param configKeyIdentifier Identifier of the configuration key in OA configuration that holds the filesystem URI to template 
	 * @param formSubmitEndpoint EndPoint on which the form should be submitted 
	 * @param configRootContextDir Path to MOA-ID-Auth configuration root directory 
	 * 			or null if the form must not submitted
	 */
	public SPSpecificGUIBuilderConfigurationWithFileSystemLoad(String authURL, String viewName, 
			String configKeyIdentifier, String formSubmitEndpoint, String configRootContextDir) {
		super(authURL, viewName, formSubmitEndpoint);
		this.configKeyIdentifier = configKeyIdentifier;
		this.configRootContextDir = configRootContextDir;
		
	}
	
	/**
	 * @param Current processed pending-request DAO but never null
	 * @param viewName Name of the template (with suffix) but never null
	 * @param configKeyIdentifier Identifier of the configuration key in OA configuration that holds the filesystem URI to template 
	 * @param formSubmitEndpoint EndPoint on which the form should be submitted 
	 * @param configRootContextDir Path to MOA-ID-Auth configuration root directory 
	 */
	public SPSpecificGUIBuilderConfigurationWithFileSystemLoad(IRequest pendingReq, String viewName, 
			String configKeyIdentifier, String formSubmitEndpoint, String configRootContextDir) {
		super(pendingReq, viewName, formSubmitEndpoint);
		this.configKeyIdentifier = configKeyIdentifier;
		this.configRootContextDir = configRootContextDir;
		
	}

	/* (non-Javadoc)
	 * @see at.gv.egovernment.moa.id.auth.frontend.AbstractGUIFormBuilder#getTemplate(java.lang.String)
	 */
	@Override
	public InputStream getTemplate(String viewName) {		
		if (pendingReq != null && pendingReq.getServiceProviderConfiguration() != null && 
				configKeyIdentifier != null) {
			try {
				String templateURL = pendingReq.getServiceProviderConfiguration().getConfigurationValue(configKeyIdentifier);
				if (MiscUtil.isNotEmpty(templateURL)) {
					String absURL = FileUtils.makeAbsoluteURL(templateURL, configRootContextDir);				
					if (!absURL.startsWith("file:")) {
						Logger.warn("GUI template are only loadable from filesystem! "
								+ "(templateURL: " + absURL + ")");
						return null;
					}
				
					Logger.debug("Load template URL for view: " + viewName + " from: " + absURL);
					URI uri = new URL(absURL).toURI();
					return new FileInputStream(new File(uri));
				
				}									
			} catch (FileNotFoundException | URISyntaxException | MalformedURLException e) {
				Logger.warn("Template for view: " + viewName + " is NOT loadable!  -> Switch to default template", e);
				
			}
		}
		Logger.trace("NO ServiceProvider specific template for view: " + viewName + " available");		
		return null;
	}

}