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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.phoenix.index;

import static org.apache.phoenix.query.QueryServices.INDEX_MUTATE_BATCH_SIZE_THRESHOLD_ATTRIB;

import java.sql.SQLException;
import java.util.List;

import org.apache.hadoop.hbase.client.Mutation;
import org.apache.hadoop.hbase.io.ImmutableBytesWritable;
import org.apache.hadoop.hbase.util.Bytes;
import org.apache.phoenix.cache.ServerCacheClient;
import org.apache.phoenix.cache.ServerCacheClient.ServerCache;
import org.apache.phoenix.compile.ScanRanges;
import org.apache.phoenix.coprocessor.BaseScannerRegionObserver;
import org.apache.phoenix.coprocessor.MetaDataProtocol;
import org.apache.phoenix.jdbc.PhoenixConnection;
import org.apache.phoenix.join.MaxServerCacheSizeExceededException;
import org.apache.phoenix.query.QueryServicesOptions;
import org.apache.phoenix.schema.PTable;
import org.apache.phoenix.util.ByteUtil;
import org.apache.phoenix.util.PhoenixRuntime;
import org.apache.phoenix.util.ReadOnlyProps;
import org.apache.phoenix.util.ScanUtil;

public class IndexMetaDataCacheClient {

    private final ServerCacheClient serverCache;
    private PTable cacheUsingTable;
    
    /**
     * Construct client used to send index metadata to each region server
     * for caching during batched put for secondary index maintenance.
     * @param connection the client connection
     * @param cacheUsingTableRef table ref to table that will use the cache during its scan
     */
    public IndexMetaDataCacheClient(PhoenixConnection connection, PTable cacheUsingTable) {
        serverCache = new ServerCacheClient(connection);
        this.cacheUsingTable = cacheUsingTable;
    }

    /**
     * Determines whether or not to use the IndexMetaDataCache to send the index metadata
     * to the region servers. The alternative is to just set the index metadata as an attribute on
     * the mutations.
     * @param connection 
     * @param mutations the list of mutations that will be sent in a batch to server
     * @param indexMetaDataByteLength length in bytes of the index metadata cache
     */
    public static boolean useIndexMetadataCache(PhoenixConnection connection, List mutations, int indexMetaDataByteLength) {
        ReadOnlyProps props = connection.getQueryServices().getProps();
        int threshold = props.getInt(INDEX_MUTATE_BATCH_SIZE_THRESHOLD_ATTRIB, QueryServicesOptions.DEFAULT_INDEX_MUTATE_BATCH_SIZE_THRESHOLD);
        return (indexMetaDataByteLength > ServerCacheClient.UUID_LENGTH && mutations.size() > threshold);
    }
    
    /**
     * Send the index metadata cahce to all region servers for regions that will handle the mutations.
     * @return client-side {@link ServerCache} representing the added index metadata cache
     * @throws SQLException 
     * @throws MaxServerCacheSizeExceededException if size of hash cache exceeds max allowed
     * size
     */
    public ServerCache addIndexMetadataCache(List mutations, ImmutableBytesWritable ptr, byte[] txState) throws SQLException {
        /**
         * Serialize and compress hashCacheTable
         */
        return serverCache.addServerCache(ScanUtil.newScanRanges(mutations), ptr, txState, new IndexMetaDataCacheFactory(), cacheUsingTable);
    }
    
    
    /**
     * Send the index metadata cahce to all region servers for regions that will handle the mutations.
     * @param txState TODO
     * @return client-side {@link ServerCache} representing the added index metadata cache
     * @throws SQLException 
     * @throws MaxServerCacheSizeExceededException if size of hash cache exceeds max allowed
     * size
     */
    public ServerCache addIndexMetadataCache(ScanRanges ranges, ImmutableBytesWritable ptr, byte[] txState) throws SQLException {
        /**
         * Serialize and compress hashCacheTable
         */
        return serverCache.addServerCache(ranges, ptr, txState, new IndexMetaDataCacheFactory(), cacheUsingTable);
    }

    public static ServerCache setMetaDataOnMutations(PhoenixConnection connection, PTable table, List mutations,
            ImmutableBytesWritable indexMetaDataPtr) throws SQLException {
        final byte[] tenantIdBytes;
        if (table.isMultiTenant()) {
            tenantIdBytes = connection.getTenantId() == null ? null : ScanUtil.getTenantIdBytes(
                    table.getRowKeySchema(), table.getBucketNum() != null, connection.getTenantId(),
                    table.getViewIndexId() != null);
        } else {
            tenantIdBytes = connection.getTenantId() == null ? null : connection.getTenantId().getBytes();
        }
        ServerCache cache = null;
        byte[] attribValue = null;
        byte[] uuidValue = null;
        byte[] txState = ByteUtil.EMPTY_BYTE_ARRAY;
        if (table.isTransactional()) {
            txState = connection.getMutationState().encodeTransaction();
        }
        boolean hasIndexMetaData = indexMetaDataPtr.getLength() > 0;
        if (hasIndexMetaData) {
            if (useIndexMetadataCache(connection, mutations, indexMetaDataPtr.getLength() + txState.length)) {
                IndexMetaDataCacheClient client = new IndexMetaDataCacheClient(connection, table);
                cache = client.addIndexMetadataCache(mutations, indexMetaDataPtr, txState);
                uuidValue = cache.getId();
            } else {
                attribValue = ByteUtil.copyKeyBytesIfNecessary(indexMetaDataPtr);
                uuidValue = ServerCacheClient.generateId();
            }
        } else if (txState.length == 0) { return null; }
        // Either set the UUID to be able to access the index metadata from the cache
        // or set the index metadata directly on the Mutation
        for (Mutation mutation : mutations) {
            if (connection.getTenantId() != null) {
                mutation.setAttribute(PhoenixRuntime.TENANT_ID_ATTRIB, tenantIdBytes);
            }
            mutation.setAttribute(PhoenixIndexCodec.INDEX_UUID, uuidValue);
            if (attribValue != null) {
                mutation.setAttribute(PhoenixIndexCodec.INDEX_PROTO_MD, attribValue);
                mutation.setAttribute(BaseScannerRegionObserver.CLIENT_VERSION,
                        Bytes.toBytes(MetaDataProtocol.PHOENIX_VERSION));
                if (txState.length > 0) {
                    mutation.setAttribute(BaseScannerRegionObserver.TX_STATE, txState);
                }
            } else if (!hasIndexMetaData && txState.length > 0) {
                mutation.setAttribute(BaseScannerRegionObserver.TX_STATE, txState);
            }
        }
        return cache;
    }
}