/**
 *                                                                            
 *  Copyright (c) 2011, 2016 - Loetz GmbH&Co.KG (69115 Heidelberg, Germany) 
 *                                                                            
 *  All rights reserved. This program and the accompanying materials           
 *  are made available under the terms of the Eclipse Public License v1.0       
 *  which accompanies this distribution, and is available at                  
 *  http://www.eclipse.org/legal/epl-v10.html                                 
 *                                                                            
 *  Contributors:                                                      
 * 	   Christophe Loetz (Loetz GmbH&Co.KG) - initial implementation
 * 
 */
 package org.eclipse.osbp.runtime.jsr303.validation;

import java.util.Locale;
import java.util.ResourceBundle;

import org.apache.bval.jsr303.DefaultMessageInterpolator;
import org.eclipse.osbp.runtime.common.i18n.II18nService;
import org.eclipse.osbp.runtime.jsr303.validation.common.ValidationUtil;
import org.osgi.framework.BundleContext;
import org.osgi.framework.FrameworkUtil;
import org.osgi.framework.ServiceReference;
import org.osgi.util.tracker.ServiceTracker;
import org.osgi.util.tracker.ServiceTrackerCustomizer;

public class OSGiMessageInterpolator extends DefaultMessageInterpolator
		implements ServiceTrackerCustomizer<II18nService, II18nService> {

	private Locale locale;
	private ServiceTracker<II18nService, II18nService> serviceTracker;
	private BundleContext context;
	private II18nService i18nService;

	public OSGiMessageInterpolator() {
		super();

		setupI18nService();
	}

	public OSGiMessageInterpolator(ResourceBundle resourceBundle) {
		super(resourceBundle);

		setupI18nService();
	}

	@Override
	public String interpolate(String message, Context context, Locale locale) {

		String result = "";
		if (i18nService != null) {
			result = i18nService.getValue(
					ValidationUtil.extractMessage(message), locale);
			if (result != null && !result.trim().equals("")) {
				result = ValidationUtil
						.replaceMessageParameter(result, context);
				return result;
			}
		}

		return super.interpolate(message, context, locale);
	}

	@Override
	public String interpolate(String message, Context context) {
		return super.interpolate(message, context);
	}

	@Override
	public void setLocale(Locale locale) {
		super.setLocale(locale);

		this.locale = locale;
	}

	private void setupI18nService() {
		context = FrameworkUtil.getBundle(getClass()).getBundleContext();
		serviceTracker = new ServiceTracker<II18nService, II18nService>(
				context, II18nService.class, this);
		serviceTracker.open();
	}

	@Override
	public II18nService addingService(ServiceReference<II18nService> reference) {
		if (i18nService == null) {
			i18nService = context.getService(reference);
		}
		return null;
	}

	@Override
	public void modifiedService(ServiceReference<II18nService> reference,
			II18nService service) {

	}

	@Override
	public void removedService(ServiceReference<II18nService> reference,
			II18nService service) {
		if (this.i18nService == service) {
			this.i18nService = null;
		}
	}

}