/*
 * Copyright (c) 2017 Pantheon Technologies, s.r.o. and others.  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
 */
package org.opendaylight.yangtools.yang.data.codec.xml;

import static java.util.Objects.requireNonNull;
import static org.junit.Assert.assertFalse;
import static org.junit.Assert.assertNotNull;

import com.google.common.collect.ImmutableList;
import java.io.IOException;
import java.io.InputStream;
import java.io.StringWriter;
import java.util.Collection;
import javax.xml.stream.XMLOutputFactory;
import javax.xml.stream.XMLStreamReader;
import javax.xml.stream.XMLStreamWriter;
import javax.xml.transform.OutputKeys;
import javax.xml.transform.Transformer;
import javax.xml.transform.TransformerException;
import javax.xml.transform.TransformerFactory;
import javax.xml.transform.TransformerFactoryConfigurationError;
import javax.xml.transform.dom.DOMResult;
import javax.xml.transform.dom.DOMSource;
import javax.xml.transform.stream.StreamResult;
import org.junit.AfterClass;
import org.junit.BeforeClass;
import org.junit.Test;
import org.junit.runner.RunWith;
import org.junit.runners.Parameterized;
import org.opendaylight.yangtools.util.xml.UntrustedXML;
import org.opendaylight.yangtools.yang.common.QName;
import org.opendaylight.yangtools.yang.data.api.schema.NormalizedNode;
import org.opendaylight.yangtools.yang.data.api.schema.stream.NormalizedNodeStreamWriter;
import org.opendaylight.yangtools.yang.data.api.schema.stream.NormalizedNodeWriter;
import org.opendaylight.yangtools.yang.data.impl.schema.ImmutableNormalizedNodeStreamWriter;
import org.opendaylight.yangtools.yang.data.impl.schema.NormalizedNodeResult;
import org.opendaylight.yangtools.yang.model.api.ContainerSchemaNode;
import org.opendaylight.yangtools.yang.model.api.EffectiveModelContext;
import org.opendaylight.yangtools.yang.model.util.SchemaContextUtil;
import org.opendaylight.yangtools.yang.test.util.YangParserTestUtils;
import org.w3c.dom.Document;
import org.w3c.dom.Node;
import org.xml.sax.SAXException;

@RunWith(Parameterized.class)
public class DOMSourceXMLStreamReaderTest {
    @Parameterized.Parameters(name = "{0}")
    public static Collection<Object[]> data() {
        return TestFactories.junitParameters();
    }

    private static EffectiveModelContext SCHEMA_CONTEXT;

    private final XMLOutputFactory factory;

    public DOMSourceXMLStreamReaderTest(final String factoryMode, final XMLOutputFactory factory) {
        this.factory = factory;
    }

    @BeforeClass
    public static void beforeClass() {
        SCHEMA_CONTEXT = YangParserTestUtils.parseYangResourceDirectory("/dom-reader-test");
    }

    @AfterClass
    public static void afterClass() {
        SCHEMA_CONTEXT = null;
    }

    @Test
    public void test() throws Exception {
        final ContainerSchemaNode outerContainerSchema = (ContainerSchemaNode) SchemaContextUtil
                .findNodeInSchemaContext(SCHEMA_CONTEXT, ImmutableList.of(QName.create("foo-ns", "top-cont")));
        assertNotNull(outerContainerSchema);

        // deserialization
        final Document doc = loadDocument("/dom-reader-test/foo.xml");
        final DOMSource inputXml = new DOMSource(doc.getDocumentElement());
        XMLStreamReader domXMLReader = new DOMSourceXMLStreamReader(inputXml);

        final NormalizedNodeResult result = new NormalizedNodeResult();
        final NormalizedNodeStreamWriter streamWriter = ImmutableNormalizedNodeStreamWriter.from(result);
        final XmlParserStream xmlParser = XmlParserStream.create(streamWriter, SCHEMA_CONTEXT, outerContainerSchema);
        xmlParser.parse(domXMLReader);
        final NormalizedNode transformedInput = result.getResult();
        assertNotNull(transformedInput);

        // serialization
        //final StringWriter writer = new StringWriter();
        final DOMResult domResult = new DOMResult(UntrustedXML.newDocumentBuilder().newDocument());
        final XMLStreamWriter xmlStreamWriter = factory.createXMLStreamWriter(domResult);

        final NormalizedNodeStreamWriter xmlNormalizedNodeStreamWriter = XMLStreamNormalizedNodeStreamWriter.create(
                xmlStreamWriter, SCHEMA_CONTEXT);

        final NormalizedNodeWriter normalizedNodeWriter = NormalizedNodeWriter.forStreamWriter(
                xmlNormalizedNodeStreamWriter);
        normalizedNodeWriter.write(transformedInput);

        //final String serializedXml = writer.toString();
        final String serializedXml = toString(domResult.getNode());
        assertFalse(serializedXml.isEmpty());
    }

    private static Document loadDocument(final String xmlPath) throws IOException, SAXException {
        final InputStream resourceAsStream = NormalizedNodesToXmlTest.class.getResourceAsStream(xmlPath);
        return requireNonNull(readXmlToDocument(resourceAsStream));
    }

    private static Document readXmlToDocument(final InputStream xmlContent) throws IOException, SAXException {
        final Document doc = UntrustedXML.newDocumentBuilder().parse(xmlContent);
        doc.getDocumentElement().normalize();
        return doc;
    }

    private static String toString(final Node xml) {
        try {
            final Transformer transformer = TransformerFactory.newInstance().newTransformer();
            transformer.setOutputProperty(OutputKeys.INDENT, "yes");
            transformer.setOutputProperty("{http://xml.apache.org/xslt}indent-amount", "4");

            final StreamResult result = new StreamResult(new StringWriter());
            final DOMSource source = new DOMSource(xml);
            transformer.transform(source, result);

            return result.getWriter().toString();
        } catch (IllegalArgumentException | TransformerFactoryConfigurationError | TransformerException e) {
            throw new RuntimeException("Unable to serialize xml element " + xml, e);
        }
    }
}