package de.thedevstack.conversationsplus.services.filetransfer.http.download;

import de.thedevstack.android.logcat.Logging;
import de.thedevstack.conversationsplus.ConversationsPlusApplication;
import de.thedevstack.conversationsplus.ConversationsPlusPreferences;
import de.thedevstack.conversationsplus.entities.Message;
import de.thedevstack.conversationsplus.enums.MessageStatus;
import de.thedevstack.conversationsplus.http.HttpHeadRetrievedListener;
import de.thedevstack.conversationsplus.services.filetransfer.FileTransferManager;
import de.thedevstack.conversationsplus.utils.MessageUtil;
import de.thedevstack.conversationsplus.utils.XmppConnectionServiceAccessor;

/**
 *
 */
public class AutomaticFileDownload implements HttpHeadRetrievedListener {

    @Override
    public void onFileSizeRetrieved(long size, Message message) {
        if (!this.transferFile(message)) { // file cannot be auto downloaded - but message is successfully received
            Logging.d("http-download", "No automatic download started - but message was transmitted");
            MessageUtil.setAndSaveMessageStatus(message, MessageStatus.TRANSMITTED);
        }
    }

    /**
     * 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
     */
    public boolean transferFile(Message message) {
        if (this.accept(message)) { // link or attached file can be auto downloaded
            Logging.d("http-download", "Starting automatic download");
            FileTransferManager ftm = FileTransferManager.getInstance();
            if (ftm.accept(message)) {
                return ftm.transferFile(message);
            }
        }
        return false;
    }

    /**
     * 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
     */
    public boolean accept(Message message) {
        long size = message.getFileParams().getSize();
        return ConversationsPlusApplication.hasStoragePermission()
                && size > -1
                && size <= ConversationsPlusPreferences.autoAcceptFileSize()
                && XmppConnectionServiceAccessor.xmppConnectionService.isDownloadAllowedInConnection();
    }
}