package at.gv.egovernment.moa.id.auth.builder;

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 org.apache.commons.io.IOUtils;

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.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 SERVLET = CONTEXTPATH+"/GenerateIframeTemplate";
	
	public 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, OAAuthParameter.ONLINEBKU);
				template = template.replace(BKU_HANDY, OAAuthParameter.HANDYBKU);
				template = template.replace(BKU_LOCAL, OAAuthParameter.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 = 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);
			
			value = FormBuildUtils.customiceLayoutBKUSelection(value, 
					oaParam.isShowMandateCheckBox(),
					oaParam.isOnlyMandateAllowed(),
					oaParam.getFormCustomizaten());
						
		}
		return value;
	}
}