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/*
 * 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.hudi.hadoop.realtime;

import org.apache.hadoop.mapred.FileSplit;

import java.io.DataInput;
import java.io.DataOutput;
import java.io.IOException;
import java.nio.charset.StandardCharsets;
import java.util.ArrayList;
import java.util.List;

/**
 * Filesplit that wraps the base split and a list of log files to merge deltas from.
 */
public class HoodieRealtimeFileSplit extends FileSplit {

  private List deltaLogPaths;

  private String maxCommitTime;

  private String basePath;

  public HoodieRealtimeFileSplit() {
    super();
  }

  public HoodieRealtimeFileSplit(FileSplit baseSplit, String basePath, List deltaLogPaths, String maxCommitTime)
      throws IOException {
    super(baseSplit.getPath(), baseSplit.getStart(), baseSplit.getLength(), baseSplit.getLocations());
    this.deltaLogPaths = deltaLogPaths;
    this.maxCommitTime = maxCommitTime;
    this.basePath = basePath;
  }

  public List getDeltaLogPaths() {
    return deltaLogPaths;
  }

  public String getMaxCommitTime() {
    return maxCommitTime;
  }

  public String getBasePath() {
    return basePath;
  }

  private static void writeString(String str, DataOutput out) throws IOException {
    byte[] bytes = str.getBytes(StandardCharsets.UTF_8);
    out.writeInt(bytes.length);
    out.write(bytes);
  }

  private static String readString(DataInput in) throws IOException {
    byte[] bytes = new byte[in.readInt()];
    in.readFully(bytes);
    return new String(bytes, StandardCharsets.UTF_8);
  }

  @Override
  public void write(DataOutput out) throws IOException {
    super.write(out);
    writeString(basePath, out);
    writeString(maxCommitTime, out);
    out.writeInt(deltaLogPaths.size());
    for (String logFilePath : deltaLogPaths) {
      writeString(logFilePath, out);
    }
  }

  @Override
  public void readFields(DataInput in) throws IOException {
    super.readFields(in);
    basePath = readString(in);
    maxCommitTime = readString(in);
    int totalLogFiles = in.readInt();
    deltaLogPaths = new ArrayList<>(totalLogFiles);
    for (int i = 0; i < totalLogFiles; i++) {
      deltaLogPaths.add(readString(in));
    }
  }

  @Override
  public String toString() {
    return "HoodieRealtimeFileSplit{DataPath=" + getPath() + ", deltaLogPaths=" + deltaLogPaths
        + ", maxCommitTime='" + maxCommitTime + '\'' + ", basePath='" + basePath + '\'' + '}';
  }
}