/*
 * 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.tuscany.nosqldatastore.cassandra;

import me.prettyprint.cassandra.serializers.StringSerializer;
import me.prettyprint.cassandra.service.template.ColumnFamilyResult;
import me.prettyprint.cassandra.service.template.ColumnFamilyTemplate;
import me.prettyprint.cassandra.service.template.ColumnFamilyUpdater;
import me.prettyprint.cassandra.service.template.ThriftColumnFamilyTemplate;
import me.prettyprint.hector.api.Cluster;
import me.prettyprint.hector.api.Keyspace;
import me.prettyprint.hector.api.ddl.ColumnFamilyDefinition;
import me.prettyprint.hector.api.exceptions.HInvalidRequestException;
import me.prettyprint.hector.api.factory.HFactory;
import org.apache.tuscany.nosqldatastore.Group;
import org.apache.tuscany.nosqldatastore.exception.DuplicateEntryException;
import org.apache.tuscany.nosqldatastore.exception.EntryNotFoundException;

class CassandraGroup implements Group {

    private ColumnFamilyTemplate<String,String> template;
    private ColumnFamilyUpdater<String, String> updater;
    private final StringSerializer se = StringSerializer.get();

    CassandraGroup(String groupId, Keyspace keyspace, Cluster cluster) {
        try{
            ColumnFamilyDefinition cfDef = HFactory.createColumnFamilyDefinition(keyspace.getKeyspaceName(), groupId);
            cluster.addColumnFamily(cfDef);
        }catch (HInvalidRequestException e){
            System.out.println("Connect to the existing group...");
        }
        template = new ThriftColumnFamilyTemplate<String, String>(keyspace,groupId,se,se,HFactory.createMutator(keyspace, se));
    }

    public void addEntry(String key, String value) throws DuplicateEntryException {
        ColumnFamilyResult wrapper = template.queryColumns(key);
        if(wrapper.getString(key) == null){
            updater = template.createUpdater(key);
            updater.setString(key, value);
            template.update(updater);
            template.addColumn(key, se);
            return;
        }
        throw new DuplicateEntryException("Entry already exist for key "+key);
    }

    public void deleteEntry(String key) throws EntryNotFoundException {
        ColumnFamilyResult wrapper = template.queryColumns(key);
        if(wrapper.getString(key) != null){
            template.deleteColumn(key, key);
            return;
        }
        throw new EntryNotFoundException("Entry does not exist for key "+key);
    }

    public String getEntry(String key) throws EntryNotFoundException {
        ColumnFamilyResult wrapper = template.queryColumns(key);
        String entry =  wrapper.getString(key);
        if(entry != null){
            return entry;
        }
        throw new EntryNotFoundException("Entry does not exist for key "+key);

    }

    public void updateEntry(String key, String value) throws EntryNotFoundException {
        ColumnFamilyResult wrapper = template.queryColumns(key);
        if(wrapper.getString(key) != null){
            updater = template.createUpdater(key);
            updater.setString(key, value);
            template.update(updater);
            template.addColumn(key, se);
            return;
        }
        throw new EntryNotFoundException("Entry does not exist for key "+key);
    }

}