/*
 * Licensed to the Apache Software Foundation (ASF) under one
 * or more contributor license agreements.  See the NOTICE file
 * distributed with this work for additional information
 * regarding copyright ownership.  The ASF licenses this file
 * to you 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 org.apache.iotdb.flink;

import org.apache.flink.api.common.typeinfo.TypeInformation;
import org.apache.flink.api.common.typeinfo.Types;
import org.apache.flink.api.java.tuple.Tuple7;
import org.apache.flink.api.java.typeutils.RowTypeInfo;
import org.apache.flink.streaming.api.datastream.DataStream;
import org.apache.flink.streaming.api.environment.StreamExecutionEnvironment;
import org.apache.flink.types.Row;
import org.apache.iotdb.flink.tsfile.RowTSRecordConverter;
import org.apache.iotdb.flink.tsfile.TSRecordOutputFormat;
import org.apache.iotdb.tsfile.common.constant.QueryConstant;
import org.apache.iotdb.tsfile.file.metadata.enums.TSDataType;
import org.apache.iotdb.tsfile.file.metadata.enums.TSEncoding;
import org.apache.iotdb.tsfile.read.common.Path;
import org.apache.iotdb.tsfile.write.schema.MeasurementSchema;
import org.apache.iotdb.tsfile.write.schema.Schema;

import java.io.File;
import java.util.ArrayList;
import java.util.Arrays;
import java.util.List;
import java.util.stream.Collectors;

/**
 * The example of writing to TsFile via Flink DataStream API.
 */
public class FlinkTsFileStreamSink {

	public static final String DEFAULT_TEMPLATE = "template";

	public static void main(String[] arg) throws Exception {
		String path = new File("test.tsfile").getAbsolutePath();
		new File(path).deleteOnExit();
		String[] filedNames = {
			QueryConstant.RESERVED_TIME,
			"device_1.sensor_1",
			"device_1.sensor_2",
			"device_1.sensor_3",
			"device_2.sensor_1",
			"device_2.sensor_2",
			"device_2.sensor_3"
		};
		TypeInformation[] typeInformations = new TypeInformation[] {
			Types.LONG,
			Types.LONG,
			Types.LONG,
			Types.LONG,
			Types.LONG,
			Types.LONG,
			Types.LONG
		};
		RowTypeInfo rowTypeInfo = new RowTypeInfo(typeInformations, filedNames);
		Schema schema = new Schema();
		schema.extendTemplate(
			DEFAULT_TEMPLATE, new MeasurementSchema("sensor_1", TSDataType.INT64, TSEncoding.TS_2DIFF));
		schema.extendTemplate(
			DEFAULT_TEMPLATE, new MeasurementSchema("sensor_2", TSDataType.INT64, TSEncoding.TS_2DIFF));
		schema.extendTemplate(
			DEFAULT_TEMPLATE, new MeasurementSchema("sensor_3", TSDataType.INT64, TSEncoding.TS_2DIFF));
		RowTSRecordConverter converter = new RowTSRecordConverter(rowTypeInfo);
		TSRecordOutputFormat<Row> outputFormat = new TSRecordOutputFormat<>(schema, converter);
		outputFormat.setOutputFilePath(new org.apache.flink.core.fs.Path(path));

		List<Tuple7> data = new ArrayList<>(7);
		data.add(new Tuple7(1L, 2L, 3L, 4L, 5L, 6L, 7L));
		data.add(new Tuple7(2L, 3L, 4L, 5L, 6L, 7L, 8L));
		data.add(new Tuple7(3L, 4L, 5L, 6L, 7L, 8L, 9L));
		data.add(new Tuple7(4L, 5L, 6L, 7L, 8L, 9L, 10L));
		data.add(new Tuple7(6L, 6L, 7L, 8L, 9L, 10L, 11L));
		data.add(new Tuple7(7L, 7L, 8L, 9L, 10L, 11L, 12L));
		data.add(new Tuple7(8L, 8L, 9L, 10L, 11L, 12L, 13L));

		StreamExecutionEnvironment env = StreamExecutionEnvironment.getExecutionEnvironment();
		// If the parallelism > 1, flink create a directory and each subtask will create a tsfile under the directory.
		env.setParallelism(1);
		DataStream<Tuple7> source = env.fromCollection(
			data, Types.TUPLE(Types.LONG, Types.LONG, Types.LONG, Types.LONG, Types.LONG, Types.LONG, Types.LONG));
		source.map(t -> {
			Row row = new Row(7);
			for (int i = 0; i < 7; i++) {
				row.setField(i, t.getField(i));
			}
			return row;
		}).returns(rowTypeInfo).writeUsingOutputFormat(outputFormat);

		env.execute();

		List<Path> paths = Arrays.stream(filedNames)
			.filter(s -> !s.equals(QueryConstant.RESERVED_TIME))
			.map(Path::new)
			.collect(Collectors.toList());
		String[] result = TsFileUtils.readTsFile(path, paths);
		for (String row : result) {
			System.out.println(row);
		}
	}
}
