/**
 *
 * Copyright 2017 Paul Schaub
 *
 * Licensed under the Apache License, Version 2.0 (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.apache.org/licenses/LICENSE-2.0
 *
 * 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.jivesoftware.smackx.jingle.transport.jingle_ibb;

import org.jivesoftware.smack.SmackException;
import org.jivesoftware.smack.XMPPConnection;
import org.jivesoftware.smack.XMPPException;
import org.jivesoftware.smack.packet.Stanza;
import org.jivesoftware.smack.util.StringUtils;
import org.jivesoftware.smackx.bytestreams.BytestreamSession;
import org.jivesoftware.smackx.bytestreams.ibb.InBandBytestreamListener;
import org.jivesoftware.smackx.bytestreams.ibb.InBandBytestreamManager;
import org.jivesoftware.smackx.bytestreams.ibb.InBandBytestreamRequest;
import org.jivesoftware.smackx.jingle.element.JingleContentTransportInfoElement;
import org.jivesoftware.smackx.jingle.element.JingleElement;
import org.jivesoftware.smackx.jingle.internal.JingleSession;
import org.jivesoftware.smackx.jingle.internal.JingleTransport;
import org.jivesoftware.smackx.jingle.internal.JingleTransportCandidate;
import org.jivesoftware.smackx.jingle.transport.jingle_ibb.element.JingleIBBTransportElement;

/**
 * Jingle InBandBytestream Transport component.
 */
public class JingleIBBTransport extends JingleTransport<JingleIBBTransportElement> {

    public static final String NAMESPACE_V1 = "urn:xmpp:jingle:transports:ibb:1";
    public static final String NAMESPACE = NAMESPACE_V1;

    private final String streamId;
    private final Short blockSize;

    public JingleIBBTransport(String streamId, Short blockSize) {
        this.streamId = streamId;
        this.blockSize = blockSize;
    }

    public JingleIBBTransport() {
        this(StringUtils.randomString(10), JingleIBBTransportElement.DEFAULT_BLOCK_SIZE);
    }

    public Short getBlockSize() {
        return blockSize;
    }

    public String getSid() {
        return streamId;
    }

    @Override
    public JingleIBBTransportElement getElement() {
        return new JingleIBBTransportElement(streamId, blockSize);
    }

    @Override
    public String getNamespace() {
        return NAMESPACE;
    }

    @Override
    public void establishIncomingBytestreamSession(final XMPPConnection connection) {
        final JingleSession session = getParent().getParent();

        final InBandBytestreamManager inBandBytestreamManager = InBandBytestreamManager.getByteStreamManager(connection);

        InBandBytestreamListener bytestreamListener = new InBandBytestreamListener() {
            @Override
            public void incomingBytestreamRequest(InBandBytestreamRequest request) {
                if (request.getFrom().asFullJidIfPossible().equals(session.getPeer())
                        && request.getSessionID().equals(getSid())) {
                    BytestreamSession bytestreamSession;

                    inBandBytestreamManager.removeIncomingBytestreamListener(this);

                    try {
                        bytestreamSession = request.accept();
                    } catch (InterruptedException | SmackException e) {
                        getParent().onTransportFailed(e);
                        return;
                    }

                    JingleIBBTransport.this.bytestreamSession = bytestreamSession;

                    getParent().onTransportReady();
                }
            }
        };

        InBandBytestreamManager.getByteStreamManager(connection)
                .addIncomingBytestreamListener(bytestreamListener);
    }

    @Override
    public void establishOutgoingBytestreamSession(XMPPConnection connection) {
        JingleSession session = getParent().getParent();
        InBandBytestreamManager inBandBytestreamManager = InBandBytestreamManager.getByteStreamManager(connection);
        inBandBytestreamManager.setDefaultBlockSize(blockSize);
        try {
            JingleIBBTransport.this.bytestreamSession = inBandBytestreamManager.establishSession(session.getPeer(), getSid());
            getParent().onTransportReady();
        } catch (SmackException.NoResponseException | XMPPException.XMPPErrorException | InterruptedException | SmackException.NotConnectedException e) {
            getParent().onTransportFailed(e);
        }
    }

    @Override
    public void addCandidate(JingleTransportCandidate<?> candidate) {
        // Sorry, we don't want any candidates.
    }

    @Override
    public void handleTransportInfo(JingleContentTransportInfoElement info, JingleElement wrapping) {
        // Nothing to do.
    }

    @Override
    protected boolean isNonFatalException(Exception exception) {
        return false;
    }

    @Override
    protected void handleStanza(Stanza stanza) throws SmackException.NotConnectedException, InterruptedException {

    }
}