/*
 * Copyright (c) 2016, Harald Kuhr
 * All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions are met:
 *     * Redistributions of source code must retain the above copyright
 *       notice, this list of conditions and the following disclaimer.
 *     * Redistributions in binary form must reproduce the above copyright
 *       notice, this list of conditions and the following disclaimer in the
 *       documentation and/or other materials provided with the distribution.
 *     * Neither the name "TwelveMonkeys" nor the
 *       names of its contributors may be used to endorse or promote products
 *       derived from this software without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
 * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR
 * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
 * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
 * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
 * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
 * LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
 * NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
 * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 */

package com.twelvemonkeys.imageio.plugins.tiff;

import com.twelvemonkeys.lang.Validate;
import org.w3c.dom.NamedNodeMap;
import org.w3c.dom.Node;

import javax.imageio.metadata.IIOInvalidTreeException;
import javax.imageio.metadata.IIOMetadata;
import javax.imageio.metadata.IIOMetadataNode;
import java.nio.ByteOrder;

import static java.nio.ByteOrder.BIG_ENDIAN;

/**
 * TIFFStreamMetadata.
 *
 * @author <a href="mailto:harald.kuhr@gmail.com">Harald Kuhr</a>
 * @author last modified by $Author: harald.kuhr$
 * @version $Id: TIFFStreamMetadata.java,v 1.0 02/06/16 harald.kuhr Exp$
 */
public final class TIFFStreamMetadata extends IIOMetadata {

    public static final String SUN_NATIVE_STREAM_METADATA_FORMAT_NAME = "com_sun_media_imageio_plugins_tiff_stream_1.0";

    ByteOrder byteOrder = BIG_ENDIAN;

    public TIFFStreamMetadata() {
        super(false, SUN_NATIVE_STREAM_METADATA_FORMAT_NAME, null, null, null);
    }


    @Override
    public boolean isReadOnly() {
        return false;
    }

    @Override
    public Node getAsTree(final String formatName) {
        Validate.isTrue(nativeMetadataFormatName.equals(formatName), formatName, "Unsupported metadata format: %s");

        IIOMetadataNode root = new IIOMetadataNode(nativeMetadataFormatName);

        IIOMetadataNode byteOrderNode = new IIOMetadataNode("ByteOrder");
        root.appendChild(byteOrderNode);
        byteOrderNode.setAttribute("value", byteOrder.toString());

        return root;
    }

    @Override
    public void mergeTree(final String formatName, final Node root) throws IIOInvalidTreeException {
        Validate.isTrue(nativeMetadataFormatName.equals(formatName), formatName, "Unsupported metadata format: %s");
        Validate.notNull(root, "root");

        if (!nativeMetadataFormatName.equals(root.getNodeName())) {
            throw new IIOInvalidTreeException("Root must be " + nativeMetadataFormatName, root);
        }

        Node node = root.getFirstChild();
        if (node == null || !node.getNodeName().equals("ByteOrder")) {
            throw new IIOInvalidTreeException("Missing \"ByteOrder\" node", node);
        }

        NamedNodeMap attributes = node.getAttributes();
        String value = attributes.getNamedItem("value").getNodeValue();

        if (value == null) {
            throw new IIOInvalidTreeException("Missing \"value\" attribute in \"ByteOrder\" node", node);
        }

        ByteOrder order = getByteOrder(value.toUpperCase());
        if (order == null) {
            throw new IIOInvalidTreeException("Unknown ByteOrder \"value\" attribute: " + value, node);
        }
        else {
            byteOrder = order;
        }
    }

    private ByteOrder getByteOrder(final String value) throws IIOInvalidTreeException {
        switch (value) {
            case "BIG_ENDIAN":
                return ByteOrder.BIG_ENDIAN;
            case "LITTLE_ENDIAN":
                return ByteOrder.LITTLE_ENDIAN;
            default:
                return null;
        }
    }

    @Override
    public void reset() {
        // Big endian is always the default
        byteOrder = BIG_ENDIAN;
    }
}
