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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.execute;

import java.util.ArrayList;
import java.util.List;
import java.util.Optional;
import java.util.concurrent.Callable;
import java.util.function.Supplier;

import javax.inject.Inject;
import javax.inject.Provider;
import javax.inject.Singleton;

import com.google.cloud.spanner.DatabaseClient;
import com.google.cloud.spanner.ResultSet;
import com.google.cloud.spanner.Statement;

import io.datarouter.email.type.DatarouterEmailTypes.SchemaUpdatesEmailType;
import io.datarouter.gcp.spanner.connection.SpannerDatabaseClientsHolder;
import io.datarouter.gcp.spanner.ddl.SpannerSingleTableSchemaUpdateService;
import io.datarouter.gcp.spanner.ddl.SpannerTableOperationsGenerator;
import io.datarouter.instrumentation.changelog.ChangelogRecorder;
import io.datarouter.storage.client.ClientId;
import io.datarouter.storage.config.executor.DatarouterStorageExecutors.DatarouterSchemaUpdateScheduler;
import io.datarouter.storage.config.properties.AdminEmail;
import io.datarouter.storage.config.properties.EnvironmentName;
import io.datarouter.storage.config.properties.ServerName;
import io.datarouter.storage.config.schema.SchemaUpdateResult;
import io.datarouter.storage.config.storage.clusterschemaupdatelock.DatarouterClusterSchemaUpdateLockDao;
import io.datarouter.storage.node.type.physical.PhysicalNode;
import io.datarouter.web.config.DatarouterWebPaths;
import io.datarouter.web.config.settings.DatarouterSchemaUpdateEmailSettings;
import io.datarouter.web.email.DatarouterHtmlEmailService;
import io.datarouter.web.email.StandardDatarouterEmailHeaderService;
import io.datarouter.web.handler.EmailingSchemaUpdateService;
import io.datarouter.web.monitoring.BuildProperties;

@Singleton
public class SpannerSchemaUpdateService extends EmailingSchemaUpdateService{

	private final SpannerSingleTableSchemaUpdateService singleTableSchemaUpdateFactory;
	private final SpannerTableOperationsGenerator tableOperationsGenerator;
	private final SpannerDatabaseClientsHolder clientPoolHolder;

	@Inject
	public SpannerSchemaUpdateService(
			ServerName serverName,
			EnvironmentName environmentName,
			AdminEmail adminEmail,
			SpannerSingleTableSchemaUpdateService singleTableSchemaUpdateFactory,
			SpannerTableOperationsGenerator tableOperationsGenerator,
			DatarouterSchemaUpdateScheduler executor,
			SpannerDatabaseClientsHolder clientPoolHolder,
			DatarouterHtmlEmailService htmlEmailService,
			DatarouterWebPaths datarouterWebPaths,
			Provider schemaUpdateLockDao,
			Provider changelogRecorder,
			BuildProperties buildProperties,
			StandardDatarouterEmailHeaderService standardDatarouterEmailHeaderService,
			SchemaUpdatesEmailType schemaUpdatesEmailType,
			DatarouterSchemaUpdateEmailSettings schemaUpdateEmailSettings){
		super(
				serverName,
				environmentName,
				adminEmail,
				executor,
				schemaUpdateLockDao,
				changelogRecorder,
				buildProperties.getBuildId(),
				htmlEmailService,
				datarouterWebPaths,
				standardDatarouterEmailHeaderService,
				schemaUpdatesEmailType,
				schemaUpdateEmailSettings);
		this.singleTableSchemaUpdateFactory = singleTableSchemaUpdateFactory;
		this.tableOperationsGenerator = tableOperationsGenerator;
		this.clientPoolHolder = clientPoolHolder;
	}

	@Override
	protected Callable> makeSchemaUpdateCallable(
			ClientId clientId,
			Supplier> existingTableNames,
			PhysicalNode node){
		return () -> singleTableSchemaUpdateFactory.performSchemaUpdate(clientId, existingTableNames, node);
	}

	@Override
	protected List fetchExistingTables(ClientId clientId){
		List existingTableNames = new ArrayList<>();
		DatabaseClient dbClient = clientPoolHolder.getDatabaseClient(clientId);
		ResultSet resultSet = dbClient.singleUse().executeQuery(Statement.of(tableOperationsGenerator
				.getListOfTables()));
		while(resultSet.next()){
			existingTableNames.add(resultSet.getString("table_name"));
		}
		return existingTableNames;
	}

}