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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.node;

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

import io.datarouter.gcp.spanner.SpannerClientManager;
import io.datarouter.gcp.spanner.field.SpannerFieldCodecRegistry;
import io.datarouter.gcp.spanner.op.read.SpannerGetKeyOp;
import io.datarouter.gcp.spanner.op.read.SpannerGetOp;
import io.datarouter.gcp.spanner.scan.SpannerDatabeanScanner;
import io.datarouter.gcp.spanner.scan.SpannerKeyScanner;
import io.datarouter.model.databean.Databean;
import io.datarouter.model.key.primary.PrimaryKey;
import io.datarouter.model.serialize.fielder.DatabeanFielder;
import io.datarouter.scanner.Scanner;
import io.datarouter.storage.client.ClientType;
import io.datarouter.storage.config.Config;
import io.datarouter.storage.node.NodeParams;
import io.datarouter.storage.node.op.raw.read.MapStorageReader;
import io.datarouter.storage.node.op.raw.read.SortedStorageReader;
import io.datarouter.storage.node.type.index.ManagedNodesHolder;
import io.datarouter.storage.node.type.physical.base.BasePhysicalNode;
import io.datarouter.util.tuple.Range;

public class SpannerReaderNode<
		PK extends PrimaryKey,
		D extends Databean,
		F extends DatabeanFielder>
extends BasePhysicalNode
implements MapStorageReader, SortedStorageReader{

	protected final ManagedNodesHolder managedNodesHolder;
	protected final SpannerClientManager clientManager;
	protected final SpannerFieldCodecRegistry spannerFieldCodecRegistry;

	public SpannerReaderNode(
			NodeParams params,
			ClientType clientType,
			ManagedNodesHolder managedNodesHolder,
			SpannerClientManager clientManager,
			SpannerFieldCodecRegistry spannerFieldCodecRegistry){
		super(params, clientType);
		this.managedNodesHolder = managedNodesHolder;
		this.clientManager = clientManager;
		this.spannerFieldCodecRegistry = spannerFieldCodecRegistry;
	}

	@Override
	public boolean exists(PK key, Config config){
		var getKeyOp = new SpannerGetKeyOp<>(
				clientManager.getDatabaseClient(getClientId()),
				getFieldInfo(),
				Collections.singletonList(key),
				config,
				spannerFieldCodecRegistry);
		return !getKeyOp.wrappedCall().isEmpty();
	}

	@Override
	public List getKeys(Collection keys, Config config){
		var getKeyOp = new SpannerGetKeyOp<>(
				clientManager.getDatabaseClient(getClientId()),
				getFieldInfo(),
				keys,
				config,
				spannerFieldCodecRegistry);
		return getKeyOp.wrappedCall();
	}

	@Override
	public D get(PK key, Config config){
		return getMulti(Collections.singletonList(key), config).stream()
				.findFirst()
				.orElse(null);
	}

	@Override
	public List getMulti(Collection keys, Config config){
		var getOp = new SpannerGetOp<>(
				clientManager.getDatabaseClient(getClientId()),
				getFieldInfo(),
				keys,
				config,
				spannerFieldCodecRegistry);
		return getOp.wrappedCall();
	}

	@SuppressWarnings("resource")
	@Override
	public Scanner scanRanges(Collection> ranges, Config config){
		return new SpannerDatabeanScanner<>(
				clientManager.getDatabaseClient(getClientId()),
				getFieldInfo(),
				ranges,
				config,
				spannerFieldCodecRegistry,
				false)
				.concat(Scanner::of);
	}

	@Override
	public Scanner scan(Range range, Config config){
		return scanRanges(Collections.singletonList(range), config);
	}

	@SuppressWarnings("resource")
	@Override
	public Scanner scanRangesKeys(Collection> ranges, Config config){
		return new SpannerKeyScanner<>(
				clientManager.getDatabaseClient(getClientId()),
				getFieldInfo(),
				ranges,
				config,
				spannerFieldCodecRegistry,
				false)
				.concat(Scanner::of);
	}

}