package com.juick.components;

import org.apache.commons.codec.digest.DigestUtils;
import org.apache.commons.io.FilenameUtils;
import org.apache.commons.lang3.math.NumberUtils;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import org.springframework.core.env.Environment;
import rocks.xmpp.addr.Jid;
import rocks.xmpp.core.XmppException;
import rocks.xmpp.core.stanza.model.Message;
import rocks.xmpp.extensions.component.accept.ExternalComponent;
import rocks.xmpp.extensions.filetransfer.FileTransfer;
import rocks.xmpp.extensions.filetransfer.FileTransferManager;
import rocks.xmpp.extensions.oob.model.x.OobX;

import java.io.IOException;
import java.net.URI;
import java.net.URISyntaxException;
import java.nio.file.Path;
import java.nio.file.Paths;
import java.util.ArrayList;
import java.util.List;
import java.util.concurrent.ExecutionException;

/**
 * Created by vitalyster on 11.11.2016.
 */
public class XMPPFTServer implements AutoCloseable {
    private static final Logger logger = LoggerFactory.getLogger(XMPPFTServer.class);

    private ExternalComponent component;

    public XMPPFTServer(Environment env) {
        component = ExternalComponent.create(env.getProperty("component_name", "files"),
                env.getProperty("component_password", "secret"), env.getProperty("component_host", "localhost"),
                NumberUtils.toInt(env.getProperty("component_port", "5347"), 5347));
        String tmpDir = env.getProperty("upload_tmp_dir", "/tmp");
        String juickJid = env.getProperty("xmppbot_jid", "juick@juick.com/Juick");
        FileTransferManager fileTransferManager = component.getManager(FileTransferManager.class);
        fileTransferManager.addFileTransferOfferListener(e -> {
            try {
                List<String> allowedTypes = new ArrayList<String>() {{ add("png"); add("jpg"); }};
                String attachmentExtension = FilenameUtils.getExtension(e.getName()).toLowerCase();
                String targetFilename = String.format("%s.%s",
                        DigestUtils.md5Hex(String.format("%s-%s",
                                e.getInitiator().toString(), e.getSessionId()).getBytes()), attachmentExtension);
                if (allowedTypes.contains(attachmentExtension)) {
                    Path filePath = Paths.get(tmpDir, targetFilename);
                    FileTransfer ft = e.accept(filePath).get();
                    ft.addFileTransferStatusListener(st -> {
                        logger.debug(String.format("%s: received %d of %d", e.getName(), st.getBytesTransferred(), e.getSize()));
                        if (ft.isDone()) {
                            logger.info("transfer completed");
                            Message msg = new Message();
                            msg.setType(Message.Type.CHAT);
                            msg.setFrom(e.getInitiator());
                            msg.setTo(Jid.of(juickJid));
                            msg.setBody(e.getDescription());
                            try {
                                String attachmentUrl = String.format("juick://%s", targetFilename);
                                msg.addExtension(new OobX(new URI(attachmentUrl), "!!!!Juick!!"));
                                component.sendMessage(msg);
                            } catch (URISyntaxException e1) {
                                logger.warn("attachment error", e1);
                            }
                        }
                    });
                    ft.transfer();
                    logger.info("transfer started");
                } else {
                    e.reject();
                    logger.info("transfer rejected");
                }
            } catch (IOException | InterruptedException | ExecutionException e1) {
                logger.error("ft error", e1);
            }
        });
        try {
            component.connect();
        } catch (XmppException e) {
            logger.error("ft initialization error", e);
        }
    }

    @Override
    public void close() throws Exception {
        if (component != null)
            component.close();

        logger.info("ExternalComponent on xmpp-ft destroyed");
    }
}