/*
 * JBoss, Home of Professional Open Source
 * Copyright 2010-2016, Red Hat, Inc. and individual contributors
 * by the @authors tag. See the copyright.txt in the distribution for a
 * full listing of individual contributors.
 *
 * This is free software; you can redistribute it and/or modify it
 * under the terms of the GNU Lesser General Public License as
 * published by the Free Software Foundation; either version 2.1 of
 * the License, or (at your option) any later version.
 *
 * This software is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
 * Lesser General Public License for more details.
 *
 * You should have received a copy of the GNU Lesser General Public
 * License along with this software; if not, write to the Free
 * Software Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA
 * 02110-1301 USA, or see the FSF site: http://www.fsf.org.
 */
package org.jboss.test.selenium.support.ui;

import org.openqa.selenium.StaleElementReferenceException;
import org.openqa.selenium.WebDriver;
import org.openqa.selenium.WebElement;

import com.google.common.base.Predicate;

public class ElementIsFocused implements Predicate<WebDriver> {

    private WebElement activeElement;
    private final WebElement element;

    /**
     * Provide element to wait to gain focus or null if you want to fail for no element having focus
     */
    public ElementIsFocused(WebElement element) {
        this.element = element;
    }

    @Override
    public boolean apply(WebDriver browser) {
        try {
            activeElement = FocusRetriever.retrieveActiveElement(browser);
            if (element == null) {
                return activeElement == null;
            }
            return activeElement == null ? false : activeElement.equals(element);
        } catch (StaleElementReferenceException e) {
            return false;
        }
    }

    @Override
    public String toString() {
        String focused = (activeElement == null) ? null : ((activeElement.getAttribute("id") != null) ? activeElement.getAttribute("id") : activeElement.toString());
        return String.format("waiting for the focus on '%s' failed - last focused element: %s", element, focused);
    }
}