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/*
 * Copyright (c) 1997, 2023 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.
 *
 * This Source Code may also be made available under the following Secondary
 * Licenses when the conditions for such availability set forth in the
 * Eclipse Public License v. 2.0 are satisfied: GNU General Public License,
 * version 2 with the GNU Classpath Exception, which is available at
 * https://www.gnu.org/software/classpath/license.html.
 *
 * SPDX-License-Identifier: EPL-2.0 OR GPL-2.0 WITH Classpath-exception-2.0
 */

package org.eclipse.angus.mail.handlers;

import jakarta.activation.ActivationDataFlavor;
import jakarta.activation.DataSource;
import jakarta.mail.internet.ContentType;
import jakarta.mail.internet.ParseException;

import javax.xml.transform.Source;
import javax.xml.transform.Transformer;
import javax.xml.transform.TransformerException;
import javax.xml.transform.TransformerFactory;
import javax.xml.transform.stream.StreamResult;
import javax.xml.transform.stream.StreamSource;
import java.io.IOException;
import java.io.OutputStream;

/**
 * DataContentHandler for text/xml.
 *
 * @author Anil Vijendran
 * @author Bill Shannon
 */
public class text_xml extends text_plain {

    private static final ActivationDataFlavor[] flavors = {
            new ActivationDataFlavor(String.class, "text/xml", "XML String"),
            new ActivationDataFlavor(String.class, "application/xml", "XML String"),
            new ActivationDataFlavor(StreamSource.class, "text/xml", "XML"),
            new ActivationDataFlavor(StreamSource.class, "application/xml", "XML")
    };

    /**
     * Creates a default {@code text_xml}.
     */
    public text_xml() {
    }

    @Override
    protected ActivationDataFlavor[] getDataFlavors() {
        return flavors;
    }

    @Override
    protected Object getData(ActivationDataFlavor aFlavor, DataSource ds)
            throws IOException {
        if (aFlavor.getRepresentationClass() == String.class)
            return super.getContent(ds);
        else if (aFlavor.getRepresentationClass() == StreamSource.class)
            return new StreamSource(ds.getInputStream());
        else
            return null;        // XXX - should never happen
    }

    /**
     *
     */
    @Override
    public void writeTo(Object obj, String mimeType, OutputStream os)
            throws IOException {
        if (!isXmlType(mimeType))
            throw new IOException(
                    "Invalid content type \"" + mimeType + "\" for text/xml DCH");
        if (obj instanceof String) {
            super.writeTo(obj, mimeType, os);
            return;
        }
        if (!(obj instanceof DataSource || obj instanceof Source)) {
            throw new IOException("Invalid Object type = " + obj.getClass() +
                    ". XmlDCH can only convert DataSource or Source to XML.");
        }

        try {
            Transformer transformer =
                    TransformerFactory.newInstance().newTransformer();
            StreamResult result = new StreamResult(os);
            if (obj instanceof DataSource) {
                // Streaming transform applies only to
                // javax.xml.transform.StreamSource
                transformer.transform(
                        new StreamSource(((DataSource) obj).getInputStream()),
                        result);
            } else {
                transformer.transform((Source) obj, result);
            }
        } catch (TransformerException | RuntimeException ex) {
            IOException ioex = new IOException(
                    "Unable to run the JAXP transformer on a stream "
                            + ex.getMessage());
            ioex.initCause(ex);
            throw ioex;
        }
    }

    private boolean isXmlType(String type) {
        try {
            ContentType ct = new ContentType(type);
            return ct.getSubType().equals("xml") &&
                    (ct.getPrimaryType().equals("text") ||
                            ct.getPrimaryType().equals("application"));
        } catch (ParseException | RuntimeException ex) {
            return false;
        }
    }
}