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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.index;

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

import com.google.cloud.spanner.DatabaseClient;
import com.google.cloud.spanner.KeySet;
import com.google.cloud.spanner.Options;
import com.google.cloud.spanner.Options.ReadOption;
import com.google.cloud.spanner.ReadOnlyTransaction;
import com.google.cloud.spanner.ResultSet;

import io.datarouter.gcp.spanner.field.SpannerFieldCodecs;
import io.datarouter.model.databean.Databean;
import io.datarouter.model.field.Field;
import io.datarouter.model.field.FieldKey;
import io.datarouter.model.index.IndexEntry;
import io.datarouter.model.key.primary.PrimaryKey;
import io.datarouter.model.serialize.fielder.DatabeanFielder;
import io.datarouter.scanner.Scanner;
import io.datarouter.storage.config.Config;
import io.datarouter.storage.serialize.fieldcache.IndexEntryFieldInfo;
import io.datarouter.storage.serialize.fieldcache.PhysicalDatabeanFieldInfo;

public class SpannerGetFromIndexOp<
		PK extends PrimaryKey,
		D extends Databean,
		F extends DatabeanFielder,
		IK extends PrimaryKey,
		IE extends IndexEntry,
		IF extends DatabeanFielder>
extends SpannerBaseReadIndexOp{

	private final Collection keys;
	private final IndexEntryFieldInfo indexEntryFieldInfo;

	public SpannerGetFromIndexOp(
			DatabaseClient client,
			PhysicalDatabeanFieldInfo fieldInfo,
			Collection keys,
			Config config,
			SpannerFieldCodecs fieldCodecs,
			IndexEntryFieldInfo indexEntryFieldInfo){
		super(client, config, fieldCodecs, fieldInfo.getTableName());
		this.keys = keys;
		this.indexEntryFieldInfo = indexEntryFieldInfo;
	}

	@Override
	public KeySet buildKeySet(){
		return buildKeySet(keys);
	}

	@Override
	public List wrappedCall(){
		List columns = Scanner.of(indexEntryFieldInfo.getFields())
				.map(Field::getKey)
				.map(FieldKey::getColumnName)
				.list();
		String indexName = indexEntryFieldInfo.getIndexName();
		ReadOption[] readOptions = config.findLimit()
				.map(limit -> new ReadOption[]{Options.limit(limit)})
				.orElseGet(() -> new ReadOption[]{});
		try(ReadOnlyTransaction txn = client.readOnlyTransaction()){
			try(ResultSet rs = txn.readUsingIndex(
						tableName,
						indexName,
						buildKeySet(),
						columns,
						readOptions)){
				return createFromResultSet(
						rs,
						indexEntryFieldInfo.getDatabeanSupplier(),
						indexEntryFieldInfo.getFields());
			}
		}
	}

}