/*
 *
 * 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.qpid.server.virtualhost;

import static org.mockito.Matchers.any;
import static org.mockito.Matchers.argThat;
import static org.mockito.Matchers.eq;
import static org.mockito.Matchers.isNull;
import static org.mockito.Matchers.same;
import static org.mockito.Mockito.mock;
import static org.mockito.Mockito.never;
import static org.mockito.Mockito.times;
import static org.mockito.Mockito.verify;
import static org.mockito.Mockito.when;

import java.util.UUID;

import junit.framework.TestCase;

import org.apache.qpid.server.logging.EventLogger;
import org.apache.qpid.server.logging.subjects.MessageStoreLogSubject;
import org.apache.qpid.server.message.EnqueueableMessage;
import org.apache.qpid.server.message.MessageInstance;
import org.apache.qpid.server.message.ServerMessage;
import org.apache.qpid.server.queue.AMQQueue;
import org.apache.qpid.server.queue.QueueEntry;
import org.apache.qpid.server.store.MessageStore;
import org.apache.qpid.server.store.NullMessageStore;
import org.apache.qpid.server.store.StorableMessageMetaData;
import org.apache.qpid.server.store.StoreException;
import org.apache.qpid.server.store.StoredMessage;
import org.apache.qpid.server.store.TestMessageMetaData;
import org.apache.qpid.server.store.Transaction;
import org.apache.qpid.server.store.Transaction.Record;
import org.apache.qpid.server.store.TransactionLogResource;
import org.apache.qpid.server.store.handler.DistributedTransactionHandler;
import org.apache.qpid.server.store.handler.MessageHandler;
import org.apache.qpid.server.store.handler.MessageInstanceHandler;
import org.apache.qpid.server.txn.DtxBranch;
import org.apache.qpid.server.txn.DtxRegistry;
import org.apache.qpid.server.util.Action;
import org.apache.qpid.transport.Xid;
import org.mockito.ArgumentMatcher;

public class MessageStoreRecovererTest extends TestCase
{
    private VirtualHost _virtualHost;

    @Override
    protected void setUp() throws Exception
    {
        super.setUp();

        _virtualHost = mock(VirtualHost.class);
        when(_virtualHost.getEventLogger()).thenReturn(new EventLogger());

    }

    @SuppressWarnings("unchecked")
    public void testRecoveryOfSingleMessageOnSingleQueue()
    {
        final AMQQueue<?> queue = createRegisteredMockQueue();

        final long messageId = 1;
        final StoredMessage<StorableMessageMetaData> storedMessage = createMockStoredMessage(messageId);

        MessageStore store = new NullMessageStore()
        {
            @Override
            public void visitMessages(MessageHandler handler) throws StoreException
            {
                handler.handle(storedMessage);
            }

            @Override
            public void visitMessageInstances(MessageInstanceHandler handler) throws StoreException
            {
                handler.handle(queue.getId(), messageId);
            }
        };

        when(_virtualHost.getMessageStore()).thenReturn(store);

        MessageStoreRecoverer recoverer = new MessageStoreRecoverer(_virtualHost, mock(MessageStoreLogSubject.class));
        recoverer.recover();

        ServerMessage<?> message = storedMessage.getMetaData().getType().createMessage(storedMessage);
        verify(queue, times(1)).enqueue(eq(message), (Action<? super MessageInstance>)isNull());
    }

    @SuppressWarnings("unchecked")
    public void testRecoveryOfMessageInstanceForNonExistingMessage()
    {
        final AMQQueue<?> queue = createRegisteredMockQueue();

        final long messageId = 1;
        final Transaction transaction = mock(Transaction.class);

        MessageStore store = new NullMessageStore()
        {
            @Override
            public void visitMessages(MessageHandler handler) throws StoreException
            {
                // no message to visit
            }

            @Override
            public void visitMessageInstances(MessageInstanceHandler handler) throws StoreException
            {
                handler.handle(queue.getId(), messageId);
            }

            @Override
            public Transaction newTransaction()
            {
                return transaction;
            }
        };

        when(_virtualHost.getMessageStore()).thenReturn(store);

        MessageStoreRecoverer recoverer = new MessageStoreRecoverer(_virtualHost, mock(MessageStoreLogSubject.class));
        recoverer.recover();

        verify(queue, never()).enqueue(any(ServerMessage.class), any(Action.class));
        verify(transaction).dequeueMessage(same(queue), argThat(new MessageNumberMatcher(messageId)));
        verify(transaction, times(1)).commitTranAsync();
    }

    public void testRecoveryOfMessageInstanceForNonExistingQueue()
    {
        final UUID queueId = UUID.randomUUID();
        final Transaction transaction = mock(Transaction.class);
        final long messageId = 1;
        final StoredMessage<StorableMessageMetaData> storedMessage = createMockStoredMessage(messageId);

        MessageStore store = new NullMessageStore()
        {
            @Override
            public void visitMessages(MessageHandler handler) throws StoreException
            {
                handler.handle(storedMessage);
            }

            @Override
            public void visitMessageInstances(MessageInstanceHandler handler) throws StoreException
            {
                handler.handle(queueId, messageId);
            }

            @Override
            public Transaction newTransaction()
            {
                return transaction;
            }
        };

        when(_virtualHost.getMessageStore()).thenReturn(store);

        MessageStoreRecoverer recoverer = new MessageStoreRecoverer(_virtualHost, mock(MessageStoreLogSubject.class));
        recoverer.recover();

        verify(transaction).dequeueMessage(argThat(new QueueIdMatcher(queueId)), argThat(new MessageNumberMatcher(messageId)));
        verify(transaction, times(1)).commitTranAsync();
    }

    public void testRecoveryDeletesOrphanMessages()
    {

        final long messageId = 1;
        final StoredMessage<StorableMessageMetaData> storedMessage = createMockStoredMessage(messageId);

        MessageStore store = new NullMessageStore()
        {
            @Override
            public void visitMessages(MessageHandler handler) throws StoreException
            {
                handler.handle(storedMessage);
            }

            @Override
            public void visitMessageInstances(MessageInstanceHandler handler) throws StoreException
            {
                // No messages instances
            }
        };

        when(_virtualHost.getMessageStore()).thenReturn(store);

        MessageStoreRecoverer recoverer = new MessageStoreRecoverer(_virtualHost, mock(MessageStoreLogSubject.class));
        recoverer.recover();

        verify(storedMessage, times(1)).remove();
    }

    @SuppressWarnings("unchecked")
    public void testRecoveryOfSingleEnqueueWithDistributedTransaction()
    {
        AMQQueue<?> queue = createRegisteredMockQueue();

        final Transaction transaction = mock(Transaction.class);

        final StoredMessage<StorableMessageMetaData> storedMessage = createMockStoredMessage(1);
        long messageId = storedMessage.getMessageNumber();

        EnqueueableMessage enqueueableMessage = createMockEnqueueableMessage(messageId, storedMessage);
        Record enqueueRecord = createMockRecord(queue, enqueueableMessage);

        final long format = 1;
        final byte[] globalId = new byte[] {0};
        final byte[] branchId = new byte[] {0};
        final Record[] enqueues = { enqueueRecord };
        final Record[] dequeues = {};

        MessageStore store = new NullMessageStore()
        {
            @Override
            public void visitMessages(MessageHandler handler) throws StoreException
            {
                handler.handle(storedMessage);
            }

            @Override
            public void visitMessageInstances(MessageInstanceHandler handler) throws StoreException
            {
                // No messages instances
            }

            @Override
            public void visitDistributedTransactions(DistributedTransactionHandler handler) throws StoreException
            {
                handler.handle(format, globalId, branchId, enqueues, dequeues);
            }

            @Override
            public Transaction newTransaction()
            {
                return transaction;
            }
        };

        DtxRegistry dtxRegistry = new DtxRegistry();

        when(_virtualHost.getMessageStore()).thenReturn(store);
        when(_virtualHost.getDtxRegistry()).thenReturn(dtxRegistry);

        MessageStoreRecoverer recoverer = new MessageStoreRecoverer(_virtualHost, mock(MessageStoreLogSubject.class));
        recoverer.recover();

        DtxBranch branch = dtxRegistry.getBranch(new Xid(format, globalId, branchId));
        assertNotNull("Expected dtx branch to be created", branch);
        branch.commit();

        ServerMessage<?> message = storedMessage.getMetaData().getType().createMessage(storedMessage);
        verify(queue, times(1)).enqueue(eq(message), (Action<? super MessageInstance>)isNull());
        verify(transaction).commitTran();
    }

    public void testRecoveryOfSingleDequeueWithDistributedTransaction()
    {
        final AMQQueue<?> queue = createRegisteredMockQueue();


        final Transaction transaction = mock(Transaction.class);

        final StoredMessage<StorableMessageMetaData> storedMessage = createMockStoredMessage(1);
        final long messageId = storedMessage.getMessageNumber();

        EnqueueableMessage enqueueableMessage = createMockEnqueueableMessage(messageId, storedMessage);
        Record dequeueRecord = createMockRecord(queue, enqueueableMessage);

        QueueEntry queueEntry = mock(QueueEntry.class);
        when(queue.getMessageOnTheQueue(messageId)).thenReturn(queueEntry);

        final long format = 1;
        final byte[] globalId = new byte[] {0};
        final byte[] branchId = new byte[] {0};
        final Record[] enqueues = {};
        final Record[] dequeues = { dequeueRecord };

        MessageStore store = new NullMessageStore()
        {
            @Override
            public void visitMessages(MessageHandler handler) throws StoreException
            {
                handler.handle(storedMessage);
            }

            @Override
            public void visitMessageInstances(MessageInstanceHandler handler) throws StoreException
            {
                // We need the message to be enqueued onto the queue so that later the distributed transaction
                // can dequeue it.
                handler.handle(queue.getId(), messageId);
            }

            @Override
            public void visitDistributedTransactions(DistributedTransactionHandler handler) throws StoreException
            {
                handler.handle(format, globalId, branchId, enqueues, dequeues);
            }

            @Override
            public Transaction newTransaction()
            {
                return transaction;
            }
        };

        DtxRegistry dtxRegistry = new DtxRegistry();

        when(_virtualHost.getMessageStore()).thenReturn(store);
        when(_virtualHost.getDtxRegistry()).thenReturn(dtxRegistry);

        MessageStoreRecoverer recoverer = new MessageStoreRecoverer(_virtualHost, mock(MessageStoreLogSubject.class));
        recoverer.recover();

        DtxBranch branch = dtxRegistry.getBranch(new Xid(format, globalId, branchId));
        assertNotNull("Expected dtx branch to be created", branch);
        branch.commit();

        verify(queueEntry, times(1)).delete();
        verify(transaction).commitTran();
    }


    protected Record createMockRecord(AMQQueue<?> queue, EnqueueableMessage enqueueableMessage)
    {
        Record enqueueRecord = mock(Record.class);
        when(enqueueRecord.getMessage()).thenReturn(enqueueableMessage);
        when(enqueueRecord.getResource()).thenReturn(queue);
        return enqueueRecord;
    }

    protected EnqueueableMessage createMockEnqueueableMessage(long messageId,
            final StoredMessage<StorableMessageMetaData> storedMessage)
    {
        EnqueueableMessage enqueueableMessage = mock(EnqueueableMessage.class);
        when(enqueueableMessage.getMessageNumber()).thenReturn(messageId);
        when(enqueueableMessage.getStoredMessage()).thenReturn(storedMessage);
        return enqueueableMessage;
    }

    private StoredMessage<StorableMessageMetaData> createMockStoredMessage(final long messageId)
    {
        TestMessageMetaData metaData = new TestMessageMetaData(messageId, 0);

        @SuppressWarnings("unchecked")
        final StoredMessage<StorableMessageMetaData> storedMessage = mock(StoredMessage.class);
        when(storedMessage.getMessageNumber()).thenReturn(messageId);
        when(storedMessage.getMetaData()).thenReturn(metaData);
        return storedMessage;
    }

    private AMQQueue<?> createRegisteredMockQueue()
    {
        AMQQueue<?> queue = mock(AMQQueue.class);
        final UUID queueId = UUID.randomUUID();
        when(queue.getId()).thenReturn(queueId);
        when(queue.getName()).thenReturn("test-queue");
        when(_virtualHost.getQueue(queueId)).thenReturn(queue);
        return queue;
    }


    private final class QueueIdMatcher extends ArgumentMatcher<TransactionLogResource>
    {
        private UUID _queueId;
        public QueueIdMatcher(UUID queueId)
        {
            _queueId = queueId;
        }

        @Override
        public boolean matches(Object argument)
        {
            return argument instanceof TransactionLogResource && _queueId.equals( ((TransactionLogResource)argument).getId() );
        }
    }

    private final class MessageNumberMatcher extends ArgumentMatcher<EnqueueableMessage>
    {
        private final long _messageId;

        private MessageNumberMatcher(long messageId)
        {
            _messageId = messageId;
        }

        @Override
        public boolean matches(Object argument)
        {
            return argument instanceof EnqueueableMessage && ((EnqueueableMessage)argument).getMessageNumber() == _messageId;
        }
    }
}