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/*
 * 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.cassandra.db;

import java.io.*;
import java.nio.ByteBuffer;

import org.apache.cassandra.config.CFMetaData;
import org.apache.cassandra.config.Schema;
import org.apache.cassandra.db.filter.*;
import org.apache.cassandra.db.marshal.AbstractType;
import org.apache.cassandra.db.marshal.CompositeType;
import org.apache.cassandra.io.IVersionedSerializer;
import org.apache.cassandra.net.MessagingService;
import org.apache.cassandra.service.StorageService;
import org.apache.cassandra.utils.ByteBufferUtil;

public class SliceByNamesReadCommand extends ReadCommand
{
    static final SliceByNamesReadCommandSerializer serializer = new SliceByNamesReadCommandSerializer();

    public final NamesQueryFilter filter;

    public SliceByNamesReadCommand(String keyspaceName, ByteBuffer key, String cfName, long timestamp, NamesQueryFilter filter)
    {
        super(keyspaceName, key, cfName, timestamp, Type.GET_BY_NAMES);
        this.filter = filter;
    }

    public ReadCommand copy()
    {
        ReadCommand readCommand= new SliceByNamesReadCommand(ksName, key, cfName, timestamp, filter);
        readCommand.setDigestQuery(isDigestQuery());
        return readCommand;
    }

    public Row getRow(Keyspace keyspace)
    {
        DecoratedKey dk = StorageService.getPartitioner().decorateKey(key);
        return keyspace.getRow(new QueryFilter(dk, cfName, filter, timestamp));
    }

    @Override
    public String toString()
    {
        return "SliceByNamesReadCommand(" +
               "keyspace='" + ksName + '\'' +
               ", key=" + ByteBufferUtil.bytesToHex(key) +
               ", cfName='" + cfName + '\'' +
               ", timestamp='" + timestamp + '\'' +
               ", filter=" + filter +
               ')';
    }

    public IDiskAtomFilter filter()
    {
        return filter;
    }
}

class SliceByNamesReadCommandSerializer implements IVersionedSerializer
{
    public void serialize(ReadCommand cmd, DataOutput out, int version) throws IOException
    {
        serialize(cmd, null, out, version);
    }

    public void serialize(ReadCommand cmd, ByteBuffer superColumn, DataOutput out, int version) throws IOException
    {
        SliceByNamesReadCommand command = (SliceByNamesReadCommand) cmd;
        out.writeBoolean(command.isDigestQuery());
        out.writeUTF(command.ksName);
        ByteBufferUtil.writeWithShortLength(command.key, out);

        if (version < MessagingService.VERSION_20)
            new QueryPath(command.cfName, superColumn).serialize(out);
        else
            out.writeUTF(command.cfName);

        if (version >= MessagingService.VERSION_20)
            out.writeLong(cmd.timestamp);

        NamesQueryFilter.serializer.serialize(command.filter, out, version);
    }

    public ReadCommand deserialize(DataInput in, int version) throws IOException
    {
        boolean isDigest = in.readBoolean();
        String keyspaceName = in.readUTF();
        ByteBuffer key = ByteBufferUtil.readWithShortLength(in);

        String cfName;
        ByteBuffer sc = null;
        if (version < MessagingService.VERSION_20)
        {
            QueryPath path = QueryPath.deserialize(in);
            cfName = path.columnFamilyName;
            sc = path.superColumnName;
        }
        else
        {
            cfName = in.readUTF();
        }

        long timestamp = version < MessagingService.VERSION_20 ? System.currentTimeMillis() : in.readLong();

        CFMetaData metadata = Schema.instance.getCFMetaData(keyspaceName, cfName);
        ReadCommand command;
        if (version < MessagingService.VERSION_20)
        {
            AbstractType comparator;
            if (metadata.cfType == ColumnFamilyType.Super)
            {
                CompositeType type = (CompositeType)metadata.comparator;
                comparator = sc == null ? type.types.get(0) : type.types.get(1);
            }
            else
            {
                comparator = metadata.comparator;
            }

            IDiskAtomFilter filter = NamesQueryFilter.serializer.deserialize(in, version, comparator);

            if (metadata.cfType == ColumnFamilyType.Super)
                filter = SuperColumns.fromSCFilter((CompositeType)metadata.comparator, sc, filter);

            // Due to SC compat, it's possible we get back a slice filter at this point
            if (filter instanceof NamesQueryFilter)
                command = new SliceByNamesReadCommand(keyspaceName, key, cfName, timestamp, (NamesQueryFilter)filter);
            else
                command = new SliceFromReadCommand(keyspaceName, key, cfName, timestamp, (SliceQueryFilter)filter);
        }
        else
        {
            NamesQueryFilter filter = NamesQueryFilter.serializer.deserialize(in, version, metadata.comparator);
            command = new SliceByNamesReadCommand(keyspaceName, key, cfName, timestamp, filter);
        }

        command.setDigestQuery(isDigest);
        return command;
    }

    public long serializedSize(ReadCommand cmd, int version)
    {
        return serializedSize(cmd, null, version);
    }

    public long serializedSize(ReadCommand cmd, ByteBuffer superColumn, int version)
    {
        TypeSizes sizes = TypeSizes.NATIVE;
        SliceByNamesReadCommand command = (SliceByNamesReadCommand) cmd;
        int size = sizes.sizeof(command.isDigestQuery());
        int keySize = command.key.remaining();

        size += sizes.sizeof(command.ksName);
        size += sizes.sizeof((short)keySize) + keySize;

        if (version < MessagingService.VERSION_20)
            size += new QueryPath(command.cfName, superColumn).serializedSize(sizes);
        else
            size += sizes.sizeof(command.cfName);

        if (version >= MessagingService.VERSION_20)
            size += sizes.sizeof(cmd.timestamp);

        size += NamesQueryFilter.serializer.serializedSize(command.filter, version);

        return size;
    }
}