/*
 * Copyright (c) 1998, 2020 Oracle and/or its affiliates. All rights reserved.
 *
 * This program and the accompanying materials are made available under the
 * terms of the Eclipse Public License v. 2.0 which is available at
 * http://www.eclipse.org/legal/epl-2.0,
 * or the Eclipse Distribution License v. 1.0 which is available at
 * http://www.eclipse.org/org/documents/edl-v10.php.
 *
 * SPDX-License-Identifier: EPL-2.0 OR BSD-3-Clause
 */

// Contributors:
//     Oracle - initial API and implementation from Oracle TopLink
package org.eclipse.persistence.testing.oxm.platform;

import java.io.InputStream;
import java.io.ByteArrayInputStream;
import java.io.ByteArrayOutputStream;
import java.net.URL;

import javax.xml.parsers.DocumentBuilder;
import javax.xml.parsers.DocumentBuilderFactory;

import org.eclipse.persistence.platform.xml.XMLPlatform;
import org.eclipse.persistence.platform.xml.XMLPlatformException;
import org.eclipse.persistence.platform.xml.XMLPlatformFactory;
import org.eclipse.persistence.platform.xml.XMLTransformer;

import org.eclipse.persistence.testing.oxm.OXTestCase;

import org.w3c.dom.Document;
import org.w3c.dom.Element;
import org.w3c.dom.Text;

public class PlatformTransformerTestCases extends OXTestCase {

    private static String XML_RESOURCE = "org/eclipse/persistence/testing/oxm/platform/employee.xsl";
    private static String XML_ERROR_RESOURCE = "org/eclipse/persistence/testing/oxm/platform/employee_error.xsl";

    public PlatformTransformerTestCases(String name) {
        super(name);
    }

    private Document getDocument(String root, String fn, String ln) throws Exception{
        DocumentBuilderFactory factory = DocumentBuilderFactory.newInstance();
        Document doc = factory.newDocumentBuilder().newDocument();

        Element empElement = doc.createElement(root);

        Element fnElement = doc.createElement(fn);
        Text fnText = doc.createTextNode("Jane");
        fnElement.appendChild(fnText);
        Element lnElement = doc.createElement(ln);
        Text lnText = doc.createTextNode("Doe");
        lnElement.appendChild(lnText);

        empElement.appendChild(fnElement);
    empElement.appendChild(lnElement);

        doc.appendChild(empElement);

        return doc;
    }

    private URL getStyleSheet(String resource) throws Exception{
        return ClassLoader.getSystemResource(resource);
    }

    public void testTransformWithStyleSheet() throws Exception{

        Document orignalDoc = getDocument("employee", "first-name", "last-name");
        log("ORIGINAL DOCUMENT");
        log(orignalDoc);

        XMLPlatform xmlPlatform = XMLPlatformFactory.getInstance().getXMLPlatform();
        XMLTransformer transformer = xmlPlatform.newXMLTransformer();

        DocumentBuilderFactory factory = DocumentBuilderFactory.newInstance();
        factory.setIgnoringElementContentWhitespace(true);
        Document outdoc = factory.newDocumentBuilder().newDocument();

        transformer.transform(orignalDoc, outdoc, getStyleSheet(XML_RESOURCE));

        log("\nRESULTING DOCUMENT");
        log(outdoc);

        Document outControlDoc = getDocument("e", "fn", "ln");

        assertXMLIdentical(outdoc, outControlDoc);

    }

    /*
    public void testTransformWithInvalidStyleSheet() throws Exception{

        try{
            Document orignalDoc = getDocument("employee", "first-name", "last-name");
            log("ORIGINAL DOCUMENT");
            log(orignalDoc);

            XMLPlatform xmlPlatform = XMLPlatformFactory.getInstance().getXMLPlatform();
            XMLTransformer transformer = xmlPlatform.newXMLTransformer();

            DocumentBuilderFactory factory = DocumentBuilderFactory.newInstance();
            Document outdoc = factory.newDocumentBuilder().newDocument();

            transformer.transform(orignalDoc, outdoc, getStyleSheet(XML_ERROR_RESOURCE));

        }catch(XMLPlatformException platformException){
            return;
        }catch(Exception exception){
            fail("An unexpected exception occurred.  Should have been caught an XMLParseException");
            return;
        }
        fail("An exception should have been caught but wasn't");
    }
    */


    public void testTransformToOutputStream() throws Exception{

        Document orignalDoc = getDocument("employee", "first-name", "last-name");
        log("ORIGINAL DOCUMENT: " );
        log(orignalDoc);

        XMLPlatform xmlPlatform = XMLPlatformFactory.getInstance().getXMLPlatform();
        XMLTransformer transformer = xmlPlatform.newXMLTransformer();
        transformer.setFormattedOutput(false);
        ByteArrayOutputStream outstream = new ByteArrayOutputStream();
        transformer.transform(orignalDoc, outstream);

        log("\noutstream: " + outstream.toString());
        DocumentBuilderFactory factory = DocumentBuilderFactory.newInstance();
        InputStream instream = new ByteArrayInputStream(outstream.toByteArray());
        Document streamDoc = factory.newDocumentBuilder().parse(instream);

        log("RESULT DOCUMENT: ");
        log(streamDoc);

        assertXMLIdentical(orignalDoc, streamDoc);
    }

    private boolean compareByteArrays(byte[] first, byte[] second)
    {
        if(first.length != second.length){
            return false;
        }

        for(int i=0; i<first.length; i++){
            if (first[i] != second[i]){
                return false;
            }
        }
        return true;
    }
}