/*******************************************************************************
 * 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 java.net.URISyntaxException;
import java.util.List;

import org.apache.commons.io.IOUtils;

import at.gv.egovernment.moa.id.auth.MOAIDAuthConstants;
import at.gv.egovernment.moa.id.commons.db.ConfigurationDBRead;
import at.gv.egovernment.moa.id.commons.db.dao.config.CPEPS;
import at.gv.egovernment.moa.id.config.ConfigurationException;
import at.gv.egovernment.moa.id.config.auth.AuthConfigurationProvider;
import at.gv.egovernment.moa.id.config.auth.IOAAuthParameters;
import at.gv.egovernment.moa.id.config.auth.OAAuthParameter;
import at.gv.egovernment.moa.id.protocols.saml1.SAML1Protocol;
import at.gv.egovernment.moa.id.util.FormBuildUtils;
import at.gv.egovernment.moa.logging.Logger;
import at.gv.egovernment.moa.util.MiscUtil;

public class LoginFormBuilder {

	private static final String HTMLTEMPLATESDIR = "htmlTemplates/";
	private static final String HTMLTEMPLATEFULL = "loginFormFull.html";
		
	private static String AUTH_URL = "#AUTH_URL#";
	private static String MODUL = "#MODUL#";
	private static String ACTION = "#ACTION#";
	private static String OANAME = "#OAName#";
	private static String BKU_ONLINE = "#ONLINE#";
	private static String BKU_HANDY =  "#HANDY#"; 
	private static String BKU_LOCAL =  "#LOCAL#"; 
	public static String CONTEXTPATH = "#CONTEXTPATH#";
	private static String MOASESSIONID = "#SESSIONID#";
	private static String PEPSLIST = "#PEPSLIST#";
		
	private static String SERVLET = CONTEXTPATH+"/GenerateIframeTemplate";
	
	private static String getTemplate() {
		String pathLocation ="";
		InputStream input = null;
		
		try {
			String rootconfigdir = AuthConfigurationProvider.getInstance().getRootConfigFileDir();
			pathLocation = rootconfigdir + HTMLTEMPLATESDIR + HTMLTEMPLATEFULL;
			File file = new File(new URI(pathLocation));
			input = new  FileInputStream(file);
			
		} catch (ConfigurationException e) {
			Logger.warn("MOA-ID configuration can not be loaded.");
			
		} catch (Exception e) {
			
		} 
		
		return getTemplate(input);		
		
	}
	
	public static String getTemplate(InputStream input) {

			String template = null; 
			
			try {
				if (input == null) {					
					
					Logger.warn("No LoginFormTempaltes found. Use Generic Templates from package.");
					
					String pathLocation = "resources/templates/" + HTMLTEMPLATEFULL;
					input = Thread.currentThread()
							.getContextClassLoader()
							.getResourceAsStream(pathLocation);
					
				}
			
				StringWriter writer = new StringWriter();
				IOUtils.copy(input, writer);
				template = writer.toString();
				template = template.replace(AUTH_URL, SERVLET);
				template = template.replace(BKU_ONLINE, IOAAuthParameters.ONLINEBKU);
				template = template.replace(BKU_HANDY, IOAAuthParameters.HANDYBKU);
				template = template.replace(BKU_LOCAL, IOAAuthParameters.LOCALBKU);
								
			} 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 buildLoginForm(String modul, String action, OAAuthParameter oaParam, String contextpath, String moaSessionID) {
		
		String value = null;
		
		byte[] oatemplate = oaParam.getBKUSelectionTemplate();
		// 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(OANAME, oaParam.getFriendlyName());
			value = value.replace(CONTEXTPATH, contextpath);
			value = value.replace(MOASESSIONID, moaSessionID);
			
			if (oaParam.isShowStorkLogin()) {
				String pepslist = "";
				List<CPEPS> cpepsList = null;
				try {
					cpepsList = ConfigurationDBRead.getMOAIDConfiguration().getAuthComponentGeneral().getForeignIdentities().getSTORK().getCPEPS();
				
					for (CPEPS current : oaParam.getPepsList())
						// check if master config has changed...
						if(cpepsList != null && cpepsList.contains(current)) {
							String countryName = null;							
							if (MiscUtil.isNotEmpty(MOAIDAuthConstants.COUNTRYCODE_XX_TO_NAME.get(current.getCountryCode().toUpperCase())))
								countryName = MOAIDAuthConstants.COUNTRYCODE_XX_TO_NAME.get(current.getCountryCode().toUpperCase());
							else
								countryName = current.getCountryCode().toUpperCase();
							
							pepslist += "<option value=" + current.getCountryCode() + ">" 
									+  countryName
									+ "</option>\n";
							
						}
					
						value = value.replace(PEPSLIST, pepslist);							
							
				} catch (NullPointerException e) {
					
				}
			}
			
			value = FormBuildUtils.customiceLayoutBKUSelection(value, 
					oaParam.isShowMandateCheckBox(),
					oaParam.isOnlyMandateAllowed(),
					oaParam.getFormCustomizaten(),
					oaParam.isShowStorkLogin());
						
		}
		return value;
	}
}