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/*
 * Licensed to Elasticsearch under one or more contributor
 * license agreements. See the NOTICE file distributed with
 * this work for additional information regarding copyright
 * ownership. Elasticsearch 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.elasticsearch.index.shard;

import org.elasticsearch.cluster.metadata.IndexMetaData;
import org.elasticsearch.common.inject.AbstractModule;
import org.elasticsearch.common.settings.Settings;
import org.elasticsearch.index.engine.EngineFactory;
import org.elasticsearch.index.engine.InternalEngineFactory;
import org.elasticsearch.index.warmer.ShardIndexWarmerService;

/**
 * The {@code IndexShardModule} module is responsible for binding the correct
 * shard id, index shard, engine factory, and warming service for a newly
 * created shard.
 */
public class IndexShardModule extends AbstractModule {

    public static final String ENGINE_FACTORY = "index.engine.factory";
    private static final Class DEFAULT_ENGINE_FACTORY_CLASS = InternalEngineFactory.class;

    private static final String ENGINE_PREFIX = "org.elasticsearch.index.engine.";
    private static final String ENGINE_SUFFIX = "EngineFactory";

    private final ShardId shardId;
    private final Settings settings;
    private final boolean primary;

    public IndexShardModule(ShardId shardId, boolean primary, Settings settings) {
        this.settings = settings;
        this.shardId = shardId;
        this.primary = primary;
    }

    /** Return true if a shadow engine should be used */
    protected boolean useShadowEngine() {
        return primary == false && IndexMetaData.isIndexUsingShadowReplicas(settings);
    }

    @Override
    protected void configure() {
        bind(ShardId.class).toInstance(shardId);
        if (useShadowEngine()) {
            bind(IndexShard.class).to(ShadowIndexShard.class).asEagerSingleton();
        } else {
            bind(IndexShard.class).asEagerSingleton();
        }

        bind(EngineFactory.class).to(settings.getAsClass(ENGINE_FACTORY, DEFAULT_ENGINE_FACTORY_CLASS, ENGINE_PREFIX, ENGINE_SUFFIX));
        bind(ShardIndexWarmerService.class).asEagerSingleton();
    }

}