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/*
 * Copyright © 2009 HotPads ([email protected])
 *
 * Licensed 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 io.datarouter.gcp.spanner.op.read;

import java.util.Collection;
import java.util.List;

import com.google.cloud.spanner.DatabaseClient;
import com.google.cloud.spanner.KeySet;

import io.datarouter.gcp.spanner.field.SpannerFieldCodecs;
import io.datarouter.model.databean.Databean;
import io.datarouter.model.key.primary.PrimaryKey;
import io.datarouter.model.serialize.fielder.DatabeanFielder;
import io.datarouter.storage.config.Config;
import io.datarouter.storage.serialize.fieldcache.PhysicalDatabeanFieldInfo;

public class SpannerGetKeyOp<
		PK extends PrimaryKey,
		D extends Databean,
		F extends DatabeanFielder>
extends SpannerBaseReadOp{

	private final Collection keys;
	protected final PhysicalDatabeanFieldInfo fieldInfo;

	public SpannerGetKeyOp(
			DatabaseClient client,
			PhysicalDatabeanFieldInfo fieldInfo,
			Collection keys,
			Config config,
			SpannerFieldCodecs fieldCodecs){
		this(client, fieldInfo, keys, config, fieldCodecs, fieldInfo.getTableName());
	}

	protected SpannerGetKeyOp(
			DatabaseClient client,
			PhysicalDatabeanFieldInfo fieldInfo,
			Collection keys,
			Config config,
			SpannerFieldCodecs fieldCodecs,
			String tableName){
		super(client, config, fieldCodecs, tableName);
		this.keys = keys;
		this.fieldInfo = fieldInfo;
	}

	@Override
	public List wrappedCall(){
		if(keys.isEmpty()){
			return List.of();
		}
		return callClient(
				fieldInfo.getPrimaryKeyFieldColumnNames(),
				fieldInfo.getPrimaryKeyFields(),
				fieldInfo.getPrimaryKeySupplier());
	}

	@Override
	public KeySet buildKeySet(){
		KeySet.Builder keySetBuilder = KeySet.newBuilder();
		keys.stream()
				.map(this::primaryKeyConversion)
				.forEach(keySetBuilder::addKey);
		return keySetBuilder.build();
	}

}