/*
 * 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.db.writelog.recover;

import org.apache.iotdb.db.conf.IoTDBConstant;
import org.apache.iotdb.db.conf.IoTDBDescriptor;
import org.apache.iotdb.db.constant.TestConstant;
import org.apache.iotdb.db.engine.fileSystem.SystemFileFactory;
import org.apache.iotdb.db.engine.storagegroup.TsFileResource;
import org.apache.iotdb.db.engine.version.VersionController;
import org.apache.iotdb.db.exception.StorageEngineException;
import org.apache.iotdb.db.exception.StorageGroupProcessorException;
import org.apache.iotdb.db.exception.metadata.MetadataException;
import org.apache.iotdb.db.metadata.PartialPath;
import org.apache.iotdb.db.qp.physical.crud.InsertRowPlan;
import org.apache.iotdb.db.query.reader.chunk.ChunkDataIterator;
import org.apache.iotdb.db.query.reader.universal.PriorityMergeReader;
import org.apache.iotdb.db.service.IoTDB;
import org.apache.iotdb.db.utils.EnvironmentUtils;
import org.apache.iotdb.db.utils.MmapUtil;
import org.apache.iotdb.db.writelog.manager.MultiFileLogNodeManager;
import org.apache.iotdb.db.writelog.node.WriteLogNode;
import org.apache.iotdb.tsfile.common.conf.TSFileDescriptor;
import org.apache.iotdb.tsfile.exception.write.WriteProcessException;
import org.apache.iotdb.tsfile.file.metadata.ChunkMetadata;
import org.apache.iotdb.tsfile.file.metadata.IChunkMetadata;
import org.apache.iotdb.tsfile.file.metadata.enums.TSDataType;
import org.apache.iotdb.tsfile.file.metadata.enums.TSEncoding;
import org.apache.iotdb.tsfile.read.TimeValuePair;
import org.apache.iotdb.tsfile.read.TsFileSequenceReader;
import org.apache.iotdb.tsfile.read.common.Chunk;
import org.apache.iotdb.tsfile.read.common.Path;
import org.apache.iotdb.tsfile.read.controller.CachedChunkLoaderImpl;
import org.apache.iotdb.tsfile.read.controller.IChunkLoader;
import org.apache.iotdb.tsfile.read.controller.IMetadataQuerier;
import org.apache.iotdb.tsfile.read.controller.MetadataQuerierByFileImpl;
import org.apache.iotdb.tsfile.read.reader.chunk.ChunkReader;
import org.apache.iotdb.tsfile.write.TsFileWriter;
import org.apache.iotdb.tsfile.write.record.TSRecord;
import org.apache.iotdb.tsfile.write.record.datapoint.DataPoint;
import org.apache.iotdb.tsfile.write.schema.MeasurementSchema;
import org.apache.iotdb.tsfile.write.schema.Schema;

import org.apache.commons.io.FileUtils;
import org.junit.After;
import org.junit.Before;
import org.junit.Test;

import java.io.File;
import java.io.IOException;
import java.nio.ByteBuffer;
import java.nio.MappedByteBuffer;
import java.util.Collections;

import static org.junit.Assert.assertEquals;

public class UnseqTsFileRecoverTest {

  private File tsF;
  private TsFileWriter writer;
  private WriteLogNode node;
  private String logNodePrefix = TestConstant.OUTPUT_DATA_DIR.concat("testNode/0");
  private Schema schema;
  private TsFileResource resource;
  private VersionController versionController =
      new VersionController() {
        private int i;

        @Override
        public long nextVersion() {
          return ++i;
        }

        @Override
        public long currVersion() {
          return i;
        }
      };

  @Before
  public void setup() throws IOException, WriteProcessException, MetadataException {
    EnvironmentUtils.envSetUp();
    tsF = SystemFileFactory.INSTANCE.getFile(logNodePrefix, "1-1-1.tsfile");
    tsF.getParentFile().mkdirs();

    schema = new Schema();
    for (int i = 0; i < 10; i++) {
      for (int j = 0; j < 10; j++) {
        PartialPath path =
            new PartialPath("root.sg.device" + i + IoTDBConstant.PATH_SEPARATOR + "sensor" + j);
        MeasurementSchema measurementSchema =
            new MeasurementSchema("sensor" + j, TSDataType.INT64, TSEncoding.PLAIN);
        schema.registerTimeseries(path.toTSFilePath(), measurementSchema);
        IoTDB.metaManager.createTimeseries(
            path,
            measurementSchema.getType(),
            measurementSchema.getEncodingType(),
            measurementSchema.getCompressor(),
            measurementSchema.getProps());
      }
    }
    schema.registerTimeseries(
        new Path(("root.sg.device99"), ("sensor4")),
        new MeasurementSchema("sensor4", TSDataType.INT64, TSEncoding.PLAIN));
    IoTDB.metaManager.createTimeseries(
        new PartialPath("root.sg.device99.sensor4"),
        TSDataType.INT64,
        TSEncoding.PLAIN,
        TSFileDescriptor.getInstance().getConfig().getCompressor(),
        Collections.emptyMap());
    schema.registerTimeseries(
        new Path(("root.sg.device99"), ("sensor2")),
        new MeasurementSchema("sensor2", TSDataType.INT64, TSEncoding.PLAIN));
    IoTDB.metaManager.createTimeseries(
        new PartialPath("root.sg.device99.sensor2"),
        TSDataType.INT64,
        TSEncoding.PLAIN,
        TSFileDescriptor.getInstance().getConfig().getCompressor(),
        Collections.emptyMap());
    schema.registerTimeseries(
        new Path(("root.sg.device99"), ("sensor1")),
        new MeasurementSchema("sensor1", TSDataType.INT64, TSEncoding.PLAIN));
    IoTDB.metaManager.createTimeseries(
        new PartialPath("root.sg.device99.sensor1"),
        TSDataType.INT64,
        TSEncoding.PLAIN,
        TSFileDescriptor.getInstance().getConfig().getCompressor(),
        Collections.emptyMap());
    writer = new TsFileWriter(tsF, schema);

    TSRecord tsRecord = new TSRecord(100, "root.sg.device99");
    tsRecord.addTuple(DataPoint.getDataPoint(TSDataType.INT64, "sensor4", String.valueOf(0)));
    writer.write(tsRecord);
    tsRecord = new TSRecord(2, "root.sg.device99");
    tsRecord.addTuple(DataPoint.getDataPoint(TSDataType.INT64, "sensor1", String.valueOf(0)));
    writer.write(tsRecord);

    for (int i = 0; i < 10; i++) {
      for (int j = 0; j < 10; j++) {
        tsRecord = new TSRecord(i, "root.sg.device" + j);
        for (int k = 0; k < 10; k++) {
          tsRecord.addTuple(
              DataPoint.getDataPoint(TSDataType.INT64, "sensor" + k, String.valueOf(k)));
        }
        writer.write(tsRecord);
      }
    }

    writer.flushAllChunkGroups();
    writer.getIOWriter().close();

    node =
        MultiFileLogNodeManager.getInstance()
            .getNode(
                logNodePrefix + tsF.getName(),
                () -> {
                  ByteBuffer[] buffers = new ByteBuffer[2];
                  buffers[0] =
                      ByteBuffer.allocateDirect(
                          IoTDBDescriptor.getInstance().getConfig().getWalBufferSize() / 2);
                  buffers[1] =
                      ByteBuffer.allocateDirect(
                          IoTDBDescriptor.getInstance().getConfig().getWalBufferSize() / 2);
                  return buffers;
                });
    for (int i = 0; i < 10; i++) {
      for (int j = 0; j < 10; j++) {
        String[] measurements = new String[10];
        TSDataType[] types = new TSDataType[10];
        String[] values = new String[10];
        for (int k = 0; k < 10; k++) {
          measurements[k] = "sensor" + k;
          types[k] = TSDataType.INT64;
          values[k] = String.valueOf(k + 10);
        }
        InsertRowPlan insertRowPlan =
            new InsertRowPlan(
                new PartialPath("root.sg.device" + j), i, measurements, types, values);
        node.write(insertRowPlan);
      }
      node.notifyStartFlush();
    }
    InsertRowPlan insertRowPlan =
        new InsertRowPlan(new PartialPath("root.sg.device99"), 1, "sensor4", TSDataType.INT64, "4");
    node.write(insertRowPlan);
    insertRowPlan =
        new InsertRowPlan(
            new PartialPath("root.sg.device99"), 300, "sensor2", TSDataType.INT64, "2");
    node.write(insertRowPlan);
    node.close();

    resource = new TsFileResource(tsF);
  }

  @After
  public void tearDown() throws IOException, StorageEngineException {
    FileUtils.deleteDirectory(tsF.getParentFile());
    resource.close();
    ByteBuffer[] array = node.delete();
    for (ByteBuffer byteBuffer : array) {
      MmapUtil.clean((MappedByteBuffer) byteBuffer);
    }
    EnvironmentUtils.cleanEnv();
  }

  @Test
  public void test() throws StorageGroupProcessorException, IOException {
    TsFileRecoverPerformer performer =
        new TsFileRecoverPerformer(logNodePrefix, resource, false, false);
    performer
        .recover(
            true,
            () -> {
              ByteBuffer[] buffers = new ByteBuffer[2];
              buffers[0] =
                  ByteBuffer.allocateDirect(
                      IoTDBDescriptor.getInstance().getConfig().getWalBufferSize() / 2);
              buffers[1] =
                  ByteBuffer.allocateDirect(
                      IoTDBDescriptor.getInstance().getConfig().getWalBufferSize() / 2);
              return buffers;
            },
            (ByteBuffer[] array) -> {
              for (ByteBuffer byteBuffer : array) {
                MmapUtil.clean((MappedByteBuffer) byteBuffer);
              }
            })
        .close();

    assertEquals(1, resource.getStartTime("root.sg.device99"));
    assertEquals(300, resource.getEndTime("root.sg.device99"));
    for (int i = 0; i < 10; i++) {
      assertEquals(0, resource.getStartTime("root.sg.device" + i));
      assertEquals(9, resource.getEndTime("root.sg.device" + i));
    }

    TsFileSequenceReader fileReader = new TsFileSequenceReader(tsF.getPath(), true);
    IMetadataQuerier metadataQuerier = new MetadataQuerierByFileImpl(fileReader);
    IChunkLoader chunkLoader = new CachedChunkLoaderImpl(fileReader);

    Path path = new Path("root.sg.device1", "sensor1");

    PriorityMergeReader unSeqMergeReader = new PriorityMergeReader();
    int priorityValue = 1;
    for (IChunkMetadata chunkMetaData : metadataQuerier.getChunkMetaDataList(path)) {
      Chunk chunk = chunkLoader.loadChunk((ChunkMetadata) chunkMetaData);
      ChunkReader chunkReader = new ChunkReader(chunk, null);
      unSeqMergeReader.addReader(new ChunkDataIterator(chunkReader), priorityValue++);
    }

    for (int i = 0; i < 10; i++) {
      TimeValuePair timeValuePair = unSeqMergeReader.currentTimeValuePair();
      assertEquals(i, timeValuePair.getTimestamp());
      assertEquals(11, (long) timeValuePair.getValue().getValue());
      unSeqMergeReader.nextTimeValuePair();
    }
    unSeqMergeReader.close();
    fileReader.close();
  }
}