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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.cql3;

import java.nio.ByteBuffer;
import java.util.Collections;
import java.util.List;
import java.util.Map;

import org.apache.cassandra.config.CFMetaData;
import org.apache.cassandra.db.*;
import org.apache.cassandra.db.composites.CellName;
import org.apache.cassandra.db.filter.ColumnSlice;
import org.apache.cassandra.exceptions.InvalidRequestException;
import org.apache.cassandra.utils.FBUtilities;

/**
 * A simple container that simplify passing parameters for collections methods.
 */
public class UpdateParameters
{
    public final CFMetaData metadata;
    public final QueryOptions options;
    public final long timestamp;
    private final int ttl;
    public final int localDeletionTime;

    // For lists operation that require a read-before-write. Will be null otherwise.
    private final Map prefetchedLists;

    public UpdateParameters(CFMetaData metadata, QueryOptions options, long timestamp, int ttl, Map prefetchedLists)
    throws InvalidRequestException
    {
        this.metadata = metadata;
        this.options = options;
        this.timestamp = timestamp;
        this.ttl = ttl;
        this.localDeletionTime = (int)(System.currentTimeMillis() / 1000);
        this.prefetchedLists = prefetchedLists;

        // We use MIN_VALUE internally to mean the absence of of timestamp (in Selection, in sstable stats, ...), so exclude
        // it to avoid potential confusion.
        if (timestamp == Long.MIN_VALUE)
            throw new InvalidRequestException(String.format("Out of bound timestamp, must be in [%d, %d]", Long.MIN_VALUE + 1, Long.MAX_VALUE));
    }

    public Cell makeColumn(CellName name, ByteBuffer value) throws InvalidRequestException
    {
        QueryProcessor.validateCellName(name, metadata.comparator);
        return AbstractCell.create(name, value, timestamp, ttl, metadata);
    }

     public Cell makeCounter(CellName name, long delta) throws InvalidRequestException
     {
         QueryProcessor.validateCellName(name, metadata.comparator);
         return new BufferCounterUpdateCell(name, delta, FBUtilities.timestampMicros());
     }

    public Cell makeTombstone(CellName name) throws InvalidRequestException
    {
        QueryProcessor.validateCellName(name, metadata.comparator);
        return new BufferDeletedCell(name, localDeletionTime, timestamp);
    }

    public RangeTombstone makeRangeTombstone(ColumnSlice slice) throws InvalidRequestException
    {
        QueryProcessor.validateComposite(slice.start, metadata.comparator);
        QueryProcessor.validateComposite(slice.finish, metadata.comparator);
        return new RangeTombstone(slice.start, slice.finish, timestamp, localDeletionTime);
    }

    public RangeTombstone makeTombstoneForOverwrite(ColumnSlice slice) throws InvalidRequestException
    {
        QueryProcessor.validateComposite(slice.start, metadata.comparator);
        QueryProcessor.validateComposite(slice.finish, metadata.comparator);
        return new RangeTombstone(slice.start, slice.finish, timestamp - 1, localDeletionTime);
    }

    /**
     * Returns the prefetched list with the already performed modifications.
     * If no modification have yet been performed this method will return the fetched list.
     * If some modifications (updates or deletions) have already been done the list returned
     * will be the result of the merge of the fetched list and of the pending mutations.
     *
     * @param rowKey the row key
     * @param cql3ColumnName the column name
     * @param cf the pending modifications
     * @return the prefetched list with the already performed modifications
     */
    public List getPrefetchedList(ByteBuffer rowKey, ColumnIdentifier cql3ColumnName, ColumnFamily cf)
    {
        if (prefetchedLists == null)
            return Collections.emptyList();

        CQL3Row row = prefetchedLists.get(rowKey);

        List cql3List = row == null ? Collections.emptyList() : row.getMultiCellColumn(cql3ColumnName);

        if (!cf.isEmpty())
        {
            ColumnFamily currentCf = cf.cloneMe();

            for (Cell c : cql3List)
                currentCf.addColumn(c);

            CFMetaData cfm = currentCf.metadata();
            CQL3Row.RowIterator iterator = cfm.comparator.CQL3RowBuilder(cfm, timestamp).group(currentCf.iterator());
            // We can only update one CQ3Row per partition key at a time (we don't allow IN for clustering key)
            cql3List = iterator.hasNext() ? iterator.next().getMultiCellColumn(cql3ColumnName) : null;
        }

        return (cql3List == null) ? Collections.emptyList() : cql3List;
    }
}