/**
 * Licensed to the Apache Software Foundation (ASF) under one
 * or more contributor license agreements. See the NOTICE file
 * distributed with this work for additional information
 * regarding copyright ownership. The ASF licenses this file
 * to you 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.apache.cxf.ws.rm.soap;

import java.io.InputStream;
import java.lang.reflect.Method;
import java.math.BigInteger;
import java.util.ArrayList;
import java.util.Collection;
import java.util.Iterator;
import java.util.List;
import java.util.Set;

import javax.xml.namespace.QName;
import javax.xml.stream.XMLInputFactory;
import javax.xml.stream.XMLStreamException;
import javax.xml.stream.XMLStreamReader;

import org.w3c.dom.Element;

import org.apache.cxf.BusFactory;
import org.apache.cxf.binding.soap.SoapFault;
import org.apache.cxf.binding.soap.SoapMessage;
import org.apache.cxf.binding.soap.interceptor.ReadHeadersInterceptor;
import org.apache.cxf.headers.Header;
import org.apache.cxf.message.Exchange;
import org.apache.cxf.message.ExchangeImpl;
import org.apache.cxf.message.Message;
import org.apache.cxf.message.MessageImpl;
import org.apache.cxf.message.MessageUtils;
import org.apache.cxf.ws.rm.AckRequestedType;
import org.apache.cxf.ws.rm.Identifier;
import org.apache.cxf.ws.rm.RMConstants;
import org.apache.cxf.ws.rm.RMContextUtils;
import org.apache.cxf.ws.rm.RMProperties;
import org.apache.cxf.ws.rm.RMUtils;
import org.apache.cxf.ws.rm.SequenceAcknowledgement;
import org.apache.cxf.ws.rm.SequenceFault;
import org.apache.cxf.ws.rm.SequenceFaultType;
import org.apache.cxf.ws.rm.SequenceType;
import org.easymock.classextension.EasyMock;
import org.easymock.classextension.IMocksControl;
import org.junit.Assert;
import org.junit.Before;
import org.junit.Test;



public class RMSoapInterceptorTest extends Assert {

    private static final String SEQ_IDENTIFIER = "http://Business456.com/RM/ABC";
    private static final BigInteger MSG1_MESSAGE_NUMBER = BigInteger.ONE;
    private static final BigInteger MSG2_MESSAGE_NUMBER = BigInteger.ONE.add(BigInteger.ONE);

    private IMocksControl control;
    
    private SequenceType s1;
    private SequenceType s2;
    private SequenceAcknowledgement ack1;
    private SequenceAcknowledgement ack2;
    private AckRequestedType ar1;
    private AckRequestedType ar2;
    
    @Before
    public void setUp() {
        control = EasyMock.createNiceControl(); 
    }

    @Test
    public void testGetUnderstoodHeaders() throws Exception {
        RMSoapInterceptor codec = new RMSoapInterceptor();
        Set<QName> headers = codec.getUnderstoodHeaders();
        assertTrue("expected Sequence header", 
                   headers.contains(RMConstants.getSequenceQName()));
        assertTrue("expected SequenceAcknowledgment header", 
                   headers.contains(RMConstants.getSequenceAckQName()));
        assertTrue("expected AckRequested header", 
                   headers.contains(RMConstants.getAckRequestedQName()));
    }
    
    @Test
    public void testHandleMessage() throws NoSuchMethodException {
        Method m = RMSoapInterceptor.class.getDeclaredMethod("mediate", 
            new Class[] {SoapMessage.class});
        RMSoapInterceptor codec = control.createMock(RMSoapInterceptor.class, new Method[] {m});
        SoapMessage msg = control.createMock(SoapMessage.class);
        codec.mediate(msg);
        EasyMock.expectLastCall();
        
        control.replay();
        codec.handleMessage(msg);
        control.verify();
    }
    
    @Test
    public void testMediate() throws NoSuchMethodException {
        Method m1 = RMSoapInterceptor.class.getDeclaredMethod("encode", 
                                                             new Class[] {SoapMessage.class});
        Method m2 = RMSoapInterceptor.class.getDeclaredMethod("decode", 
                                                              new Class[] {SoapMessage.class});
        RMSoapInterceptor codec = control.createMock(RMSoapInterceptor.class, new Method[] {m1, m2});
        
        SoapMessage msg = control.createMock(SoapMessage.class);
        Exchange exchange = control.createMock(Exchange.class);
        EasyMock.expect(msg.getExchange()).andReturn(exchange);
        EasyMock.expect(exchange.getOutMessage()).andReturn(msg);
        codec.encode(msg);
        EasyMock.expectLastCall();
        
        control.replay();
        codec.mediate(msg);
        control.verify();
                
        control.reset();
        EasyMock.expect(msg.getExchange()).andReturn(null);
        codec.decode(msg);
        EasyMock.expectLastCall();
        
        control.replay();
        codec.mediate(msg);
        control.verify();
        
    }

    @Test
    public void testEncode() throws Exception {
        RMSoapInterceptor codec = new RMSoapInterceptor();
        setUpOutbound();
        SoapMessage message = setupOutboundMessage();

        // no RM headers
   
        codec.handleMessage(message);
        verifyHeaders(message, new String[] {});

        // one sequence header

        message = setupOutboundMessage();        
        RMProperties rmps = RMContextUtils.retrieveRMProperties(message, true);     
        rmps.setSequence(s1);        
        codec.encode(message);
        verifyHeaders(message, new String[] {RMConstants.getSequenceName()});

        // one acknowledgment header

        message = setupOutboundMessage(); 
        rmps = RMContextUtils.retrieveRMProperties(message, true);          
        Collection<SequenceAcknowledgement> acks = new ArrayList<SequenceAcknowledgement>();
        acks.add(ack1);
        rmps.setAcks(acks);        
        codec.encode(message);
        verifyHeaders(message, new String[] {RMConstants.getSequenceAckName()});

        // two acknowledgment headers

        message = setupOutboundMessage();
        rmps = RMContextUtils.retrieveRMProperties(message, true);        
        acks.add(ack2);
        rmps.setAcks(acks);
        codec.encode(message);
        verifyHeaders(message, new String[] {RMConstants.getSequenceAckName(), 
                                             RMConstants.getSequenceAckName()});

        // one ack requested header

        message = setupOutboundMessage();
        rmps = RMContextUtils.retrieveRMProperties(message, true);        
        Collection<AckRequestedType> requested = new ArrayList<AckRequestedType>();
        requested.add(ar1);
        rmps.setAcksRequested(requested);
        codec.encode(message);
        verifyHeaders(message, new String[] {RMConstants.getAckRequestedName()});

        // two ack requested headers

        message = setupOutboundMessage();
        rmps = RMContextUtils.retrieveRMProperties(message, true);         
        requested.add(ar2);
        rmps.setAcksRequested(requested);
        codec.encode(message);
        verifyHeaders(message, new String[] {RMConstants.getAckRequestedName(), 
                                             RMConstants.getAckRequestedName()});
    }
    
    @Test
    public void testEncodeFault() throws Exception {
        RMSoapInterceptor codec = new RMSoapInterceptor();
        setUpOutbound();
        SoapMessage message = setupOutboundFaultMessage();

        // no RM headers and no fault
   
        codec.encode(message);
        verifyHeaders(message, new String[] {});

        // fault is not a SoapFault

        message = setupOutboundFaultMessage();
        assertTrue(MessageUtils.isFault(message));
        Exception ex = new RuntimeException("");
        message.setContent(Exception.class, ex);      
        codec.encode(message);
        verifyHeaders(message, new String[] {});
        
        // fault is a SoapFault but does not have a SequenceFault cause

        message = setupOutboundFaultMessage();
        SoapFault f = new SoapFault("REASON", RMConstants.getUnknownSequenceFaultCode());
        message.setContent(Exception.class, f);      
        codec.encode(message);
        verifyHeaders(message, new String[] {});

        // fault is a SoapFault and has a SequenceFault cause
        
        message = setupOutboundFaultMessage();
        SequenceFaultType sft = RMUtils.getWSRMFactory().createSequenceFaultType();
        sft.setFaultCode(RMConstants.getUnknownSequenceFaultCode());
        SequenceFault sf = new SequenceFault("REASON");
        sf.setSequenceFault(sft);
        Identifier sid = RMUtils.getWSRMFactory().createIdentifier();
        sid.setValue("SID");
        sf.setSender(true);
        f.initCause(sf);
        message.setContent(Exception.class, f);      
        codec.encode(message);
        verifyHeaders(message, new String[] {RMConstants.getSequenceFaultName()});

    }

    @Test
    public void testDecodeSequence() throws XMLStreamException {
        SoapMessage message = setUpInboundMessage("resources/Message1.xml");
        RMSoapInterceptor codec = new RMSoapInterceptor();
        codec.handleMessage(message);
        RMProperties rmps = RMContextUtils.retrieveRMProperties(message, false);
        SequenceType st = rmps.getSequence();
        assertNotNull(st);
        assertEquals(st.getIdentifier().getValue(), SEQ_IDENTIFIER);
        assertEquals(st.getMessageNumber(), MSG1_MESSAGE_NUMBER);
        
        assertNull(rmps.getAcks());
        assertNull(rmps.getAcksRequested());

    }

    @Test
    public void testDecodeAcknowledgements() throws XMLStreamException {
        SoapMessage message = setUpInboundMessage("resources/Acknowledgment.xml");
        RMSoapInterceptor codec = new RMSoapInterceptor();
        codec.handleMessage(message);
        RMProperties rmps = RMContextUtils.retrieveRMProperties(message, false);
        Collection<SequenceAcknowledgement> acks = rmps.getAcks();
        assertNotNull(acks);
        assertEquals(1, acks.size());
        SequenceAcknowledgement ack = acks.iterator().next();
        assertNotNull(ack);
        assertEquals(ack.getIdentifier().getValue(), SEQ_IDENTIFIER);
        assertEquals(2, ack.getAcknowledgementRange().size());
        assertNull(rmps.getSequence());
        assertNull(rmps.getAcksRequested());
    }

    @Test
    public void testDecodeAcksRequested() throws XMLStreamException {
        SoapMessage message = setUpInboundMessage("resources/Retransmission.xml");
        RMSoapInterceptor codec = new RMSoapInterceptor();
        codec.handleMessage(message);
        RMProperties rmps = RMContextUtils.retrieveRMProperties(message, false);
        Collection<AckRequestedType> requested = rmps.getAcksRequested();
        assertNotNull(requested);
        assertEquals(1, requested.size());
        AckRequestedType ar = requested.iterator().next();
        assertNotNull(ar);
        assertEquals(ar.getIdentifier().getValue(), SEQ_IDENTIFIER);

        SequenceType s = rmps.getSequence();
        assertNotNull(s);
        assertEquals(s.getIdentifier().getValue(), SEQ_IDENTIFIER);
        assertEquals(s.getMessageNumber(), MSG2_MESSAGE_NUMBER);

        assertNull(rmps.getAcks());
    }

    private void setUpOutbound() {
        org.apache.cxf.ws.rm.ObjectFactory factory = new org.apache.cxf.ws.rm.ObjectFactory();
        s1 = factory.createSequenceType();
        Identifier sid = factory.createIdentifier();
        sid.setValue("sequence1");
        s1.setIdentifier(sid);
        s1.setMessageNumber(BigInteger.ONE);
        s2 = factory.createSequenceType();
        sid = factory.createIdentifier();
        sid.setValue("sequence2");
        s2.setIdentifier(sid);
        s2.setMessageNumber(BigInteger.TEN);

        ack1 = factory.createSequenceAcknowledgement();
        SequenceAcknowledgement.AcknowledgementRange r = 
            factory.createSequenceAcknowledgementAcknowledgementRange();
        r.setLower(BigInteger.ONE);
        r.setUpper(BigInteger.ONE);
        ack1.getAcknowledgementRange().add(r);
        ack1.setIdentifier(s1.getIdentifier());

        ack2 = factory.createSequenceAcknowledgement();
        r = factory.createSequenceAcknowledgementAcknowledgementRange();
        r.setLower(BigInteger.ONE);
        r.setUpper(BigInteger.TEN);
        ack2.getAcknowledgementRange().add(r);
        ack2.setIdentifier(s2.getIdentifier());

        ar1 = factory.createAckRequestedType();
        ar1.setIdentifier(s1.getIdentifier());

        ar2 = factory.createAckRequestedType();
        ar2.setIdentifier(s2.getIdentifier());
    }

    private SoapMessage setupOutboundMessage() throws Exception {
        Message message = new MessageImpl();
        SoapMessage soapMessage = new SoapMessage(message);         
        RMProperties rmps = new RMProperties();
        RMContextUtils.storeRMProperties(soapMessage, rmps, true);
        
        return soapMessage;
    }
    
    private SoapMessage setupOutboundFaultMessage() throws Exception {
        Exchange ex = new ExchangeImpl();        
        Message message = new MessageImpl();
        SoapMessage soapMessage = new SoapMessage(message);         
        ex.setOutFaultMessage(soapMessage);
        soapMessage.setExchange(ex);        
        return soapMessage;
    }

    private void verifyHeaders(SoapMessage message, String... names) {
        List<Header> header = message.getHeaders();

        // check all expected headers are present

        for (String name : names) {
            boolean found = false;
            Iterator<Header> iter = header.iterator();
            while (iter.hasNext()) {
                Object obj = iter.next().getObject();
                if (obj instanceof Element) {
                    Element elem = (Element) obj;
                    String namespace = elem.getNamespaceURI();
                    String localName = elem.getLocalName();
                    if (RMConstants.getNamespace().equals(namespace)
                        && localName.equals(name)) {
                        found = true;
                        break;
                    } else if (RMConstants.getAddressingNamespace().equals(namespace)
                        && localName.equals(name)) {
                        found = true;
                        break;
                    }
                }
            }
            assertTrue("Could not find header element " + name, found);
        }

        // no other headers should be present

        Iterator<Header> iter1 = header.iterator();
        while (iter1.hasNext()) {
            Object obj = iter1.next().getObject();
            if (obj instanceof Element) {
                Element elem = (Element) obj;
                String namespace = elem.getNamespaceURI();
                String localName = elem.getLocalName();
                assertTrue(RMConstants.getNamespace().equals(namespace) 
                    || RMConstants.getAddressingNamespace().equals(namespace));
                boolean found = false;
                for (String name : names) {
                    if (localName.equals(name)) {
                        found = true;
                        break;
                    }
                }
                assertTrue("Unexpected header element " + localName, found);
            }
        }
    }
    
    private SoapMessage setUpInboundMessage(String resource) throws XMLStreamException {
        Message message = new MessageImpl();
        SoapMessage soapMessage = new SoapMessage(message);
        InputStream is = RMSoapInterceptorTest.class.getResourceAsStream(resource);
        assertNotNull(is);
        XMLStreamReader reader = XMLInputFactory.newInstance().createXMLStreamReader(is);
        soapMessage.setContent(XMLStreamReader.class, reader);
        ReadHeadersInterceptor rji = new ReadHeadersInterceptor(BusFactory.getDefaultBus());
        rji.handleMessage(soapMessage); 
        return soapMessage;
    }
}
