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/**
 * JBoss, Home of Professional Open Source
 * Copyright 2011, 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.arquillian.ajocado.waiting.retrievers;

import static org.jboss.arquillian.ajocado.javascript.JavaScript.js;

import org.apache.commons.lang3.StringEscapeUtils;
import org.jboss.arquillian.ajocado.framework.GrapheneSelenium;
import org.jboss.arquillian.ajocado.framework.GrapheneSeleniumContext;
import org.jboss.arquillian.ajocado.javascript.JavaScript;
import org.jboss.arquillian.ajocado.locator.attribute.AttributeLocator;
import org.jboss.arquillian.ajocado.waiting.conversion.Convertor;
import org.jboss.arquillian.ajocado.waiting.conversion.PassOnConvertor;
import org.jboss.arquillian.core.spi.Validate;

/**
 * Retrieves the attribute with given attributeLocator.
 *
 * @author Lukas Fryc
 * @version $Revision$
 */
public class AttributeRetriever extends AbstractRetriever implements Retriever {

    /**
     * Proxy to local selenium instance
     */
    private GrapheneSelenium selenium = GrapheneSeleniumContext.getProxy();

    /** The attribute locator. */
    private AttributeLocator attributeLocator;

    /**
     * Instantiates a new attribute retriever.
     */
    protected AttributeRetriever() {
    }

    /**
     * Retrieves the attribute value from element given by attributeLocator
     */
    @Override
    public String retrieve() {
        Validate.notNull(attributeLocator, "attributeLocator should not be null");

        return selenium.getAttribute(attributeLocator);
    }

    /**
     * JavaScript expression to retrieve attribute value from element given by attributeLocator
     */
    @Override
    public JavaScript getJavaScriptRetrieve() {
        String escapedLocator = StringEscapeUtils.escapeEcmaScript(attributeLocator.inSeleniumRepresentation());
        return js("selenium.getAttribute('{0}')").parametrize(escapedLocator);
    }

    /**
     * Factory method.
     *
     * @return single instance of AttributeRetriever
     */
    public static AttributeRetriever getInstance() {
        return new AttributeRetriever();
    }

    /**
     * Gets a AttributeRetriever object preset with attributeLocator to given value.
     *
     * @param attributeLocator the attribute locator to preset
     * @return the AttributeRetriever preset with attributeLocator of given value
     */
    public AttributeRetriever attributeLocator(AttributeLocator attributeLocator) {
        Validate.notNull(attributeLocator, "attributeLocator should not be null");

        AttributeRetriever copy = copy();
        copy.attributeLocator = attributeLocator;

        return copy;
    }

    /**
     * Returns a copy of this attributeRetriever with exactly same settings.
     *
     * Keeps the immutability of this class.
     *
     * @return the exact copy of this attributeRetriever
     */
    private AttributeRetriever copy() {
        AttributeRetriever copy = new AttributeRetriever();
        copy.attributeLocator = attributeLocator;
        return copy;
    }

    /**
     * Uses {@link PassOnConvertor} to pass the JavaScript result to result value.
     */
    @Override
    public Convertor getConvertor() {
        return new PassOnConvertor();
    }
}