package org.jboss.resteasy.plugins.providers.multipart;

import jakarta.ws.rs.core.MediaType;

/**
 * Represents a multipart/related (RFC2387) outgoing mime message. A
 * multipart/related message is used to hold a root or start part and other
 * parts which are referenced from the root part. All parts have a unique id.
 * The type and the id of the start part is presented in parameters in the
 * message content-type header.
 *
 * Usage is the same as with {@link MultipartOutput}:
 *
 * <code>
 * MultipartRelatedDataOutput mrdo = new MultipartRelatedDataOutput();
 * mrdo.addPart(...);
 * </code>
 *
 * The first added part will be used as root. The root parts content-type will
 * be used as the type parameter of the content-type of the mime message.
 *
 * For parts without Content-ID header a unique id will be generated during
 * serialization.
 *
 * @author Attila Kiraly
 * @version $Revision: 1 $
 */
public class MultipartRelatedOutput extends MultipartOutput {
    private String startInfo;

    /**
     * The part that will be used as the root.
     *
     * @return the first in the list of added parts.
     */
    public OutputPart getRootPart() {
        return getParts().get(0);
    }

    /**
     * Used to add parts to the multipart output message.
     *
     * @param entity
     *                                the object representing the part's body
     * @param mediaType
     *                                the Content-Type of the part
     * @param contentId
     *                                the Content-ID to be used as identification for the current
     *                                part, optional, if null one will be generated
     * @param contentTransferEncoding
     *                                The value to be used for the Content-Transfer-Encoding header
     *                                field of the part. It's optional, if you don't want to set
     *                                this pass null. Example values are: "7bit",
     *                                "quoted-printable", "base64", "8bit", "binary"
     * @return {@link OutputPart}
     */
    public OutputPart addPart(Object entity, MediaType mediaType,
            String contentId, String contentTransferEncoding) {
        OutputPart outputPart = super.addPart(entity, mediaType);
        if (contentTransferEncoding != null)
            outputPart.getHeaders().putSingle("Content-Transfer-Encoding",
                    contentTransferEncoding);
        if (contentId != null)
            outputPart.getHeaders().putSingle("Content-ID", contentId);
        return outputPart;
    }

    /**
     * Returns the start-info parameter of the Content-Type. This is an optional
     * parameter.
     *
     * As described in RFC2387:
     *
     * 3.3. The Start-Info Parameter
     *
     * Additional information can be provided to an application by the
     * start-info parameter. It contains either a string or points, via a
     * content-ID, to another MIME entity in the message. A typical use might be
     * to provide additional command line parameters or a MIME entity giving
     * auxiliary information for processing the compound object.
     *
     * Applications that use Multipart/Related must specify the interpretation
     * of start-info. User Agents shall provide the parameter's value to the
     * processing application. Processes can distinguish a start-info reference
     * from a token or quoted-string by examining the first non-white-space
     * character, "&gt;" indicates a reference.
     *
     * @return the currently configured start-info
     */
    public String getStartInfo() {
        return startInfo;
    }

    /**
     * Sets the start-info parameter of the Content-Type. This is an optional
     * parameter.
     *
     * As described in RFC2387:
     *
     * 3.3. The Start-Info Parameter
     *
     * Additional information can be provided to an application by the
     * start-info parameter. It contains either a string or points, via a
     * content-ID, to another MIME entity in the message. A typical use might be
     * to provide additional command line parameters or a MIME entity giving
     * auxiliary information for processing the compound object.
     *
     * Applications that use Multipart/Related must specify the interpretation
     * of start-info. User Agents shall provide the parameter's value to the
     * processing application. Processes can distinguish a start-info reference
     * from a token or quoted-string by examining the first non-white-space
     * character, "&gt;" indicates a reference.
     *
     * @param startInfo the value to be set
     */
    public void setStartInfo(String startInfo) {
        this.startInfo = startInfo;
    }
}
