package de.thedevstack.conversationsplus.services;

import de.thedevstack.conversationsplus.entities.Message;
import de.thedevstack.conversationsplus.services.filetransfer.FileTransferStatusListener;

/**
 * An implementation of this class transfers a file to another entity or server.
 */
public interface FileTransferService {
    /**
     * Transfers a file for the corresponding message.
     * @param message the message containing the file to transfer
     * @return <code>true</code> if the file transfer was successful, <code>false</code> otherwise
     */
    boolean transferFile(Message message);
    /**
     * Transfers a file for the corresponding message.
     * @param message the message containing the file to transfer
     * @param delay whether the message is delayed or not
     * @return <code>true</code> if the file transfer was successful, <code>false</code> otherwise
     */
    boolean transferFile(Message message, boolean delay);

    /**
     * Checks whether a message can be sent using this service or not.
     * @param message the message to be checked
     * @return <code>true</code> if the message can be processed, <code>false</code> otherwise
     */
    boolean accept(Message message);

    /**
     * Adds one or more file transfer status listeners.
     * @param listeners the listeners to add
     */
    void addFileTransferStatusListener(FileTransferStatusListener... listeners);
}