/**
 *
 * Copyright the original author or authors
 *
 * 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.bytestreams.socks5;

import static org.junit.jupiter.api.Assertions.assertEquals;
import static org.mockito.Mockito.mock;
import static org.mockito.Mockito.never;
import static org.mockito.Mockito.timeout;
import static org.mockito.Mockito.verify;

import org.jivesoftware.smack.XMPPConnection;
import org.jivesoftware.smack.packet.IQ;
import org.jivesoftware.smack.packet.StanzaError;
import org.jivesoftware.smack.test.util.Whitebox;

import org.jivesoftware.smackx.bytestreams.BytestreamRequest;
import org.jivesoftware.smackx.bytestreams.socks5.packet.Bytestream;
import org.jivesoftware.smackx.disco.ServiceDiscoveryManager;

import org.junit.jupiter.api.BeforeEach;
import org.junit.jupiter.api.Test;
import org.jxmpp.jid.DomainBareJid;
import org.jxmpp.jid.EntityFullJid;
import org.jxmpp.jid.JidTestUtil;
import org.jxmpp.jid.impl.JidCreate;
import org.mockito.ArgumentCaptor;

/**
 * Test for the InitiationListener class.
 *
 * @author Henning Staib
 */
public class InitiationListenerTest {

    private static final int TIMEOUT = 10000;

    private static final EntityFullJid initiatorJID = JidTestUtil.DUMMY_AT_EXAMPLE_ORG_SLASH_DUMMYRESOURCE;
    private static final EntityFullJid targetJID = JidTestUtil.FULL_JID_1_RESOURCE_1;
    private static final DomainBareJid proxyJID = JidTestUtil.MUC_EXAMPLE_ORG;
    private static final String proxyAddress = "127.0.0.1";
    private static final String sessionID = "session_id";

    private XMPPConnection connection;
    private Socks5BytestreamManager byteStreamManager;
    private InitiationListener initiationListener;
    private Bytestream initBytestream;

    /**
     * Initialize fields used in the tests.
     */
    @BeforeEach
    public void setup() {

        // mock connection
        connection = mock(XMPPConnection.class);

        // create service discovery manager for mocked connection
        ServiceDiscoveryManager.getInstanceFor(connection);

        // initialize Socks5ByteStreamManager to get the InitiationListener
        byteStreamManager = Socks5BytestreamManager.getBytestreamManager(connection);

        // get the InitiationListener from Socks5ByteStreamManager
        initiationListener = Whitebox.getInternalState(byteStreamManager, "initiationListener", InitiationListener.class);

        // create a SOCKS5 Bytestream initiation packet
        initBytestream = Socks5PacketUtils.createBytestreamInitiation(initiatorJID, targetJID,
                        sessionID);
        initBytestream.addStreamHost(proxyJID, proxyAddress, 7777);

    }

    /**
     * If no listeners are registered for incoming SOCKS5 Bytestream requests, all request should be
     * rejected with an error.
     *
     * @throws Exception should not happen
     */
    @Test
    public void shouldRespondWithError() throws Exception {

        // run the listener with the initiation packet
        initiationListener.handleIQRequest(initBytestream);

        // capture reply to the SOCKS5 Bytestream initiation
        ArgumentCaptor<IQ> argument = ArgumentCaptor.forClass(IQ.class);
        verify(connection, timeout(TIMEOUT)).sendStanza(argument.capture());

        // assert that reply is the correct error packet
        assertEquals(initiatorJID, argument.getValue().getTo());
        assertEquals(IQ.Type.error, argument.getValue().getType());
        assertEquals(StanzaError.Condition.not_acceptable,
                        argument.getValue().getError().getCondition());

    }

    /**
     * If a listener for all requests is registered it should be notified on incoming requests.
     *
     * @throws Exception should not happen
     */
    @Test
    public void shouldInvokeListenerForAllRequests() throws Exception {

        // add listener
        Socks5BytestreamListener listener = mock(Socks5BytestreamListener.class);
        byteStreamManager.addIncomingBytestreamListener(listener);

        // run the listener with the initiation packet
        initiationListener.handleIQRequest(initBytestream);

        // assert listener is called once
        ArgumentCaptor<BytestreamRequest> byteStreamRequest = ArgumentCaptor.forClass(BytestreamRequest.class);
        verify(listener, timeout(TIMEOUT)).incomingBytestreamRequest(byteStreamRequest.capture());

        // assert that listener is called for the correct request
        assertEquals(initiatorJID, byteStreamRequest.getValue().getFrom());

    }

    /**
     * If a listener for a specific user in registered it should be notified on incoming requests
     * for that user.
     *
     * @throws Exception should not happen
     */
    @Test
    public void shouldInvokeListenerForUser() throws Exception {

        // add listener
        Socks5BytestreamListener listener = mock(Socks5BytestreamListener.class);
        byteStreamManager.addIncomingBytestreamListener(listener, initiatorJID);

        // run the listener with the initiation packet
        initiationListener.handleIQRequest(initBytestream);

        // assert listener is called once
        ArgumentCaptor<BytestreamRequest> byteStreamRequest = ArgumentCaptor.forClass(BytestreamRequest.class);
        verify(listener, timeout(TIMEOUT)).incomingBytestreamRequest(byteStreamRequest.capture());

        // assert that reply is the correct error packet
        assertEquals(initiatorJID, byteStreamRequest.getValue().getFrom());

    }

    /**
     * If listener for a specific user is registered it should not be notified on incoming requests
     * from other users.
     *
     * @throws Exception should not happen
     */
    @Test
    public void shouldNotInvokeListenerForUser() throws Exception {

        // add listener for request of user "other_initiator"
        Socks5BytestreamListener listener = mock(Socks5BytestreamListener.class);
        byteStreamManager.addIncomingBytestreamListener(listener, JidCreate.from("other_" + initiatorJID));

        // run the listener with the initiation packet
        initiationListener.handleIQRequest(initBytestream);

        // assert listener is not called
        ArgumentCaptor<BytestreamRequest> byteStreamRequest = ArgumentCaptor.forClass(BytestreamRequest.class);
        verify(listener, never()).incomingBytestreamRequest(byteStreamRequest.capture());

        // capture reply to the SOCKS5 Bytestream initiation
        ArgumentCaptor<IQ> argument = ArgumentCaptor.forClass(IQ.class);
        verify(connection, timeout(TIMEOUT)).sendStanza(argument.capture());

        // assert that reply is the correct error packet
        assertEquals(initiatorJID, argument.getValue().getTo());
        assertEquals(IQ.Type.error, argument.getValue().getType());
        assertEquals(StanzaError.Condition.not_acceptable,
                        argument.getValue().getError().getCondition());
    }

    /**
     * If a user specific listener and an all requests listener is registered only the user specific
     * listener should be notified.
     *
     * @throws Exception should not happen
     */
    @Test
    public void shouldNotInvokeAllRequestsListenerIfUserListenerExists() throws Exception {

        // add listener for all request
        Socks5BytestreamListener allRequestsListener = mock(Socks5BytestreamListener.class);
        byteStreamManager.addIncomingBytestreamListener(allRequestsListener);

        // add listener for request of user "initiator"
        Socks5BytestreamListener userRequestsListener = mock(Socks5BytestreamListener.class);
        byteStreamManager.addIncomingBytestreamListener(userRequestsListener, initiatorJID);

        // run the listener with the initiation packet
        initiationListener.handleIQRequest(initBytestream);

        // assert user request listener is called once
        ArgumentCaptor<BytestreamRequest> byteStreamRequest = ArgumentCaptor.forClass(BytestreamRequest.class);
        verify(userRequestsListener, timeout(TIMEOUT)).incomingBytestreamRequest(byteStreamRequest.capture());

        // assert all requests listener is not called
        byteStreamRequest = ArgumentCaptor.forClass(BytestreamRequest.class);
        verify(allRequestsListener, never()).incomingBytestreamRequest(byteStreamRequest.capture());

    }

    /**
     * If a user specific listener and an all requests listener is registered only the all requests
     * listener should be notified on an incoming request for another user.
     *
     * @throws Exception should not happen
     */
    @Test
    public void shouldInvokeAllRequestsListenerIfUserListenerExists() throws Exception {
        // add listener for all request
        Socks5BytestreamListener allRequestsListener = mock(Socks5BytestreamListener.class);
        byteStreamManager.addIncomingBytestreamListener(allRequestsListener);

        // add listener for request of user "other_initiator"
        Socks5BytestreamListener userRequestsListener = mock(Socks5BytestreamListener.class);
        byteStreamManager.addIncomingBytestreamListener(userRequestsListener, JidCreate.from("other_"
                        + initiatorJID));

        // run the listener with the initiation packet
        initiationListener.handleIQRequest(initBytestream);

        ArgumentCaptor<BytestreamRequest> byteStreamRequest = ArgumentCaptor.forClass(BytestreamRequest.class);
        // assert all requests listener is called
        verify(allRequestsListener, timeout(TIMEOUT)).incomingBytestreamRequest(byteStreamRequest.capture());

        // assert user request listener is not called
        verify(userRequestsListener, never()).incomingBytestreamRequest(byteStreamRequest.capture());
    }

    /**
     * If a request with a specific session ID should be ignored no listeners should be notified.
     *
     * @throws Exception should not happen
     */
    @Test
    public void shouldIgnoreSocks5BytestreamRequestOnce() throws Exception {

        // add listener for all request
        Socks5BytestreamListener allRequestsListener = mock(Socks5BytestreamListener.class);
        byteStreamManager.addIncomingBytestreamListener(allRequestsListener);

        // add listener for request of user "initiator"
        Socks5BytestreamListener userRequestsListener = mock(Socks5BytestreamListener.class);
        byteStreamManager.addIncomingBytestreamListener(userRequestsListener, initiatorJID);

        // ignore session ID
        byteStreamManager.ignoreBytestreamRequestOnce(sessionID);

        // run the listener with the initiation packet
        initiationListener.handleIQRequest(initBytestream);

        // assert user request listener is not called
        ArgumentCaptor<BytestreamRequest> byteStreamRequest = ArgumentCaptor.forClass(BytestreamRequest.class);
        verify(userRequestsListener, never()).incomingBytestreamRequest(byteStreamRequest.capture());

        // assert all requests listener is not called
        byteStreamRequest = ArgumentCaptor.forClass(BytestreamRequest.class);
        verify(allRequestsListener, never()).incomingBytestreamRequest(byteStreamRequest.capture());

        // run the listener with the initiation packet again
        initiationListener.handleIQRequest(initBytestream);

        // assert user request listener is called on the second request with the same session ID
        verify(userRequestsListener, timeout(TIMEOUT)).incomingBytestreamRequest(byteStreamRequest.capture());

        // assert all requests listener is not called
        byteStreamRequest = ArgumentCaptor.forClass(BytestreamRequest.class);
        verify(allRequestsListener, never()).incomingBytestreamRequest(byteStreamRequest.capture());

    }

}