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/**
 * Copyright (c) 2012-2016, www.tinygroup.org ([email protected]).
 *
 *  Licensed under the GPL, Version 3.0 (the "License");
 *  you may not use this file except in compliance with the License.
 *  You may obtain a copy of the License at
 *
 *       http://www.gnu.org/licenses/gpl.html
 *
 *  Unless required by applicable law or agreed to in writing, software
 *  distributed under the License is distributed on an "AS IS" BASIS,
 *  WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 *  See the License for the specific language governing permissions and
 *  limitations under the License.
 */
package org.tinygroup.weixinhttpclient3;

import org.apache.commons.httpclient.methods.multipart.PartBase;
import org.apache.commons.httpclient.util.EncodingUtil;
import org.tinygroup.vfs.FileObject;

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

/**
 * 扩展HttpClient的Part接口，支持处理FileObject
 *
 * @author yancheng11334
 */
public class FileObjectPart extends PartBase {

    /**
     * Default content encoding of file attachments.
     */
    public static final String DEFAULT_CONTENT_TYPE = "application/octet-stream";

    /**
     * Default charset of file attachments.
     */
    public static final String DEFAULT_CHARSET = "ISO-8859-1";

    /**
     * Default transfer encoding of file attachments.
     */
    public static final String DEFAULT_TRANSFER_ENCODING = "binary";

    /**
     * Attachment's file name
     */
    protected static final String FILE_NAME = "; filename=";

    /**
     * Attachment's file name as a byte array
     */
    private static final byte[] FILE_NAME_BYTES =
            EncodingUtil.getAsciiBytes(FILE_NAME);

    /**
     * Source of the file part.
     */
    private FileObject source;

    public FileObjectPart(FileObject partSource) {
        this(partSource.getFileName(), partSource, null, null);
    }

    public FileObjectPart(FileObject partSource, String contentType, String charset) {
        this(partSource.getFileName(), partSource, contentType, charset);
    }

    public FileObjectPart(String name, FileObject partSource, String contentType, String charset) {

        super(
                name,
                contentType == null ? DEFAULT_CONTENT_TYPE : contentType,
                charset == null ? "ISO-8859-1" : charset,
                DEFAULT_TRANSFER_ENCODING
        );

        if (partSource == null) {
            throw new IllegalArgumentException("Source may not be null");
        }
        this.source = partSource;
    }

    protected void sendDispositionHeader(OutputStream out)
            throws IOException {
        out.write(CONTENT_DISPOSITION_BYTES);
        out.write(QUOTE_BYTES);
        out.write(EncodingUtil.getAsciiBytes(getName()));
        out.write(QUOTE_BYTES);
        if (source != null) {
            out.write(FILE_NAME_BYTES);
            out.write(QUOTE_BYTES);
            out.write(EncodingUtil.getAsciiBytes(source.getFileName()));
            out.write(QUOTE_BYTES);
        }
    }

    protected long lengthOfData() throws IOException {
        return source.getSize();
    }

    protected void sendData(OutputStream out) throws IOException {
        if (lengthOfData() == 0) {
            return;
        }

        byte[] tmp = new byte[4096];
        InputStream instream = source.getInputStream();
        try {
            int len;
            while ((len = instream.read(tmp)) >= 0) {
                out.write(tmp, 0, len);
            }
        } finally {
            instream.close();
        }
    }

}