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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 java.awt.*;
import java.io.IOException;
import java.io.InputStream;
import java.io.OutputStream;

/**
 * DataContentHandler for image/gif.
 */
public class image_gif extends handler_base {
    private static ActivationDataFlavor[] myDF = {
            new ActivationDataFlavor(Image.class, "image/gif", "GIF Image")
    };

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

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

    @Override
    public Object getContent(DataSource ds) throws IOException {
        InputStream is = ds.getInputStream();
        int pos = 0;
        int count;
        byte[] buf = new byte[1024];

        while ((count = is.read(buf, pos, buf.length - pos)) != -1) {
            pos += count;
            if (pos >= buf.length) {
                int size = buf.length;
                size += Math.min(size, 256 * 1024);
                byte[] tbuf = new byte[size];
                System.arraycopy(buf, 0, tbuf, 0, pos);
                buf = tbuf;
            }
        }
        Toolkit tk = Toolkit.getDefaultToolkit();
        return tk.createImage(buf, 0, pos);
    }

    /**
     * Write the object to the output stream, using the specified MIME type.
     */
    @Override
    public void writeTo(Object obj, String type, OutputStream os)
            throws IOException {
        if (!(obj instanceof Image))
            throw new IOException("\"" + getDataFlavors()[0].getMimeType() +
                    "\" DataContentHandler requires Image object, " +
                    "was given object of type " + obj.getClass().toString());

        throw new IOException(getDataFlavors()[0].getMimeType() +
                " encoding not supported");
    }
}