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/*
 * The MIT License (MIT)
 *
 * Copyright (c) 2014-2016 Christian Schudt
 *
 * Permission is hereby granted, free of charge, to any person obtaining a copy
 * of this software and associated documentation files (the "Software"), to deal
 * in the Software without restriction, including without limitation the rights
 * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
 * copies of the Software, and to permit persons to whom the Software is
 * furnished to do so, subject to the following conditions:
 *
 * The above copyright notice and this permission notice shall be included in
 * all copies or substantial portions of the Software.
 *
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
 * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
 * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
 * THE SOFTWARE.
 */

package rocks.xmpp.extensions.bytestreams.s5b;

import rocks.xmpp.core.session.XmppSession;
import rocks.xmpp.core.stanza.model.IQ;
import rocks.xmpp.core.stanza.model.errors.Condition;
import rocks.xmpp.extensions.bytestreams.ByteStreamEvent;
import rocks.xmpp.extensions.bytestreams.ByteStreamSession;
import rocks.xmpp.extensions.bytestreams.s5b.model.Socks5ByteStream;
import rocks.xmpp.extensions.bytestreams.s5b.model.StreamHost;
import rocks.xmpp.util.concurrent.AsyncResult;

import java.io.IOException;
import java.util.List;
import java.util.concurrent.CompletableFuture;
import java.util.concurrent.CompletionException;

/**
 * @author Christian Schudt
 */
final class S5bEvent extends ByteStreamEvent {

    private final XmppSession xmppSession;

    private final IQ iq;

    private final List streamHosts;

    public S5bEvent(Object source, String sessionId, XmppSession xmppSession, IQ iq, List streamHosts) {
        super(source, sessionId);
        this.xmppSession = xmppSession;
        this.iq = iq;
        this.streamHosts = streamHosts;
    }

    @Override
    public final AsyncResult accept() {

        CompletableFuture completableFuture = CompletableFuture.supplyAsync(() -> {
            try {
                // 5.3.2 Target Establishes SOCKS5 Connection with StreamHost/Requester
                // 6.3.2 Target Establishes SOCKS5 Connection with Proxy
                S5bSession s5bSession = Socks5ByteStreamManager.createS5bSession(iq.getFrom(), iq.getTo(), getSessionId(), streamHosts, xmppSession.getConfiguration().getDefaultResponseTimeout());
                // 5.3.3 Target Acknowledges Bytestream
                // 6.3.3 Target Acknowledges Bytestream
                xmppSession.send(iq.createResult(Socks5ByteStream.streamHostUsed(s5bSession.getSessionId(), s5bSession.getStreamHost())));
                return s5bSession;
            } catch (IOException e) {
                // If the Target tries but is unable to connect to any of the StreamHosts and it does not wish to attempt a connection from its side, it MUST return an  error to the Requester.
                xmppSession.send(iq.createError(Condition.ITEM_NOT_FOUND));
                throw new CompletionException(e);
            }
        });
        return new AsyncResult<>(completableFuture);

    }

    @Override
    public final void reject() {
        // Else if the Target is unwilling to accept the bytestream, it MUST return an error of  to the Requester.
        xmppSession.send(iq.createError(Condition.NOT_ACCEPTABLE));
    }
}




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