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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.write;

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

import com.google.cloud.spanner.DatabaseClient;
import com.google.cloud.spanner.Mutation;
import com.google.cloud.spanner.Mutation.WriteBuilder;

import io.datarouter.gcp.spanner.field.SpannerBaseFieldCodec;
import io.datarouter.gcp.spanner.field.SpannerFieldCodecs;
import io.datarouter.model.databean.Databean;
import io.datarouter.model.exception.DataAccessException;
import io.datarouter.model.field.Field;
import io.datarouter.model.field.encoding.FieldGeneratorType;
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.config.PutMethod;
import io.datarouter.storage.serialize.fieldcache.FieldGeneratorTool;
import io.datarouter.storage.serialize.fieldcache.PhysicalDatabeanFieldInfo;

public class SpannerPutOp<
		PK extends PrimaryKey,
		D extends Databean,
		F extends DatabeanFielder>
extends SpannerBaseWriteOp{

	protected final Config config;
	protected final PhysicalDatabeanFieldInfo fieldInfo;
	protected final SpannerFieldCodecs fieldCodecs;

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

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

	@Override
	public Collection getMutations(){
		return Scanner.of(values)
				.map(this::databeanToMutation)
				.exclude(Objects::isNull)
				.list();

	}

	protected WriteBuilder getMutationPartition(@SuppressWarnings("unused") D databean, WriteBuilder mutation){
		return mutation;
	}

	protected Mutation databeanToMutation(D databean){
		Optional> generatedField = FieldGeneratorTool.optFieldToGenerate(fieldInfo, databean);
		if(generatedField.isPresent()){
			if(fieldInfo.getAutoGeneratedType() == FieldGeneratorType.RANDOM){
				FieldGeneratorTool.generateAndSetValueForField(
						fieldInfo,
						databean,
						generatedField.get(),
						this::generatedFieldDoesntAlreadyExists);
				return null;
			}
			throw new UnsupportedOperationException("Spanner does not support managed field generation");
		}
		WriteBuilder mutation = switch(config.getPutMethod()){
		case INSERT_IGNORE,
				INSERT_OR_BUST -> Mutation.newInsertBuilder(tableName);
		case UPDATE_OR_BUST -> Mutation.newUpdateBuilder(tableName);
		case INSERT_ON_DUPLICATE_UPDATE,
				INSERT_OR_UPDATE,
				MERGE,
				SELECT_FIRST_OR_LOOK_AT_PRIMARY_KEY,
				UPDATE_IGNORE,
				UPDATE_OR_INSERT -> Mutation.newInsertOrUpdateBuilder(tableName);
		};
		mutation = getMutationPartition(databean, mutation);
		List> primaryKeyCodecs = fieldCodecs.createCodecs(
				databean.getKey().getFields());
		List> nonKeyCodecs = fieldCodecs.createCodecs(
				fieldInfo.getNonKeyFieldsWithValues(databean));
		for(SpannerBaseFieldCodec codec : primaryKeyCodecs){
			if(codec.getField().getValue() != null){
				mutation = codec.setMutation(mutation);
			}
		}
		for(SpannerBaseFieldCodec codec : nonKeyCodecs){
			mutation = codec.setMutation(mutation);
		}
		return mutation.build();
	}

	protected boolean generatedFieldDoesntAlreadyExists(D databean){
		try{
			Config bustConfig = this.config.clone();
			bustConfig.setPutMethod(PutMethod.INSERT_OR_BUST);
			SpannerPutOp putOp = new SpannerPutOp<>(
					this.client,
					this.fieldInfo,
					Collections.singletonList(databean),
					bustConfig,
					this.fieldCodecs,
					this.tableName);
			putOp.wrappedCall();
			return true;
		}catch(DataAccessException ex){
			return false;
		}
	}
}