/*******************************************************************************
 * 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.builder;

import java.io.ByteArrayInputStream;
import java.io.File;
import java.io.FileInputStream;
import java.io.FileNotFoundException;
import java.io.IOException;
import java.io.InputStream;
import java.io.StringWriter;
import java.net.URI;

import org.apache.commons.io.IOUtils;

import at.gv.egovernment.moa.id.config.auth.AuthConfigurationProviderFactory;
import at.gv.egovernment.moa.id.config.auth.OAAuthParameter;
import at.gv.egovernment.moa.id.util.FormBuildUtils;
import at.gv.egovernment.moa.logging.Logger;

public class SendAssertionFormBuilder {
	
	private static final String HTMLTEMPLATESDIR = "htmlTemplates/";
	private static final String HTMLTEMPLATEFULL = "sendAssertionFormFull.html";
	
	private static final String TEMPLATEBGCOLOR = "style=\"background-color: #COLOR#\"";
	
	private static String URL = "#URL#";
	private static String MODUL = "#MODUL#";
	private static String ACTION = "#ACTION#";
	private static String ID = "#ID#";
	private static String OANAME = "#OAName#";
	private static String CONTEXTPATH = "#CONTEXTPATH#";
	private static String BACKGROUNDCOLOR = "#BACKGROUNDCOLOR#";
	private static String COLOR = "#COLOR#";
	
	private static String SERVLET = CONTEXTPATH+"/SSOSendAssertionServlet";
	
	private static String getTemplate() {
		
		String pathLocation;
		InputStream input = null;
		try {
			String rootconfigdir = AuthConfigurationProviderFactory.getInstance().getRootConfigFileDir();	
			pathLocation = rootconfigdir + HTMLTEMPLATESDIR + HTMLTEMPLATEFULL;
		
			try {
				File file = new File(new URI(pathLocation));
				input = new  FileInputStream(file);
			
			} catch (FileNotFoundException e)  {
				
				Logger.warn("No LoginFormTempaltes found. Use Generic Templates from package.");
			
				pathLocation = "resources/templates/" + HTMLTEMPLATEFULL;
			
				input = Thread.currentThread()
						.getContextClassLoader()
						.getResourceAsStream(pathLocation);
			
			}
			
			return getTemplate(input);
			
		} catch (Exception e) {
			try {
				input.close();
				
			} catch (IOException e1) {
				Logger.warn("SendAssertionTemplate inputstream can not be closed.", e);
			}
			
			return null;
		}
		
	}
	
	private static String getTemplate(InputStream input) {

			String template = null;
			
			try {				
	
				StringWriter writer = new StringWriter();
				IOUtils.copy(input, writer);
				template = writer.toString();
				template = template.replace(URL, SERVLET);
								
			} catch (Exception e) {
				Logger.error("Failed to read template", e);
				
			} finally {
				try {
					input.close();
					
				} catch (IOException e) {
					Logger.warn("SendAssertionTemplate inputstream can not be closed.", e);
				}
			}
			
		return template;
	}

	public static String buildForm(String modul, String action, String id, OAAuthParameter oaParam, String contextpath) {
		String value = null;
		
		byte[] oatemplate = oaParam.getSendAssertionTemplate();
		// OA specific template requires a size of 8 bits minimum
		if (oatemplate != null && oatemplate.length > 7) {
			InputStream is = new ByteArrayInputStream(oatemplate);
			value = getTemplate(is);
			
		} else {
			//load default BKU-selection template
			value = getTemplate();
			
		}
		
		if(value != null) {
//			if(modul == null) {
//				modul = SAML1Protocol.PATH;
//			}
//			if(action == null) {
//				action = SAML1Protocol.GETARTIFACT;
//			}
			value = value.replace(MODUL, modul);
			value = value.replace(ACTION, action);
			value = value.replace(ID, id);
			value = value.replace(OANAME, oaParam.getFriendlyName());
			
			if (contextpath.endsWith("/"))
				contextpath = contextpath.substring(0, contextpath.length() - 1);
			value = value.replace(CONTEXTPATH, contextpath);
			
			value = FormBuildUtils.customiceLayoutBKUSelection(value, 
					oaParam.isShowMandateCheckBox(),
					oaParam.isOnlyMandateAllowed(),
					oaParam.getFormCustomizaten(),
					oaParam.isShowStorkLogin());
						
		}
		return value;
	}

}