content: /*
   * 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
   *
   *     https://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.avro.tool;
  
  import static java.util.Arrays.asList;
  import static org.junit.jupiter.api.Assertions.assertEquals;
  import static org.junit.jupiter.api.Assertions.assertThrows;
  import static org.junit.jupiter.api.Assertions.assertTrue;
  
  import java.io.ByteArrayOutputStream;
  import java.io.File;
  import java.io.FileInputStream;
  import java.io.IOException;
  import java.io.PrintStream;
  import java.util.Collections;
  import java.util.HashMap;
  import java.util.Iterator;
  import java.util.List;
  import java.util.Map;
  import java.util.Map.Entry;
  
  import org.apache.avro.Schema;
  import org.apache.avro.Schema.Type;
  import org.apache.avro.file.CodecFactory;
  import org.apache.avro.file.DataFileStream;
  import org.apache.avro.file.DataFileWriter;
  import org.apache.avro.generic.GenericData;
  import org.apache.avro.generic.GenericDatumReader;
  import org.apache.avro.generic.GenericDatumWriter;
  import org.apache.avro.generic.GenericRecord;
  import org.junit.Rule;
  import org.junit.jupiter.api.Test;
  import org.junit.jupiter.api.io.TempDir;
  import org.junit.rules.TestName;
  
  public class TestCatTool {
  
    @Rule
    public TestName name = new TestName();
  
    @TempDir
    public File DIR;
  
    private static final int ROWS_IN_INPUT_FILES = 100000;
    private static final int OFFSET = 1000;
    private static final int LIMIT_WITHIN_INPUT_BOUNDS = 100;
    private static final int LIMIT_OUT_OF_INPUT_BOUNDS = 100001;
    private static final double SAMPLERATE = .01;
    private static final double SAMPLERATE_TOO_SMALL = .00000001;
  
    private final Schema INTSCHEMA = new Schema.Parser().parse("{\"type\":\"record\", " + "\"name\":\"myRecord\", "
        + "\"fields\":[ " + "{\"name\":\"value\",\"type\":\"int\"} " + "]}");
    private final Schema STRINGSCHEMA = new Schema.Parser().parse("{\"type\":\"record\", " + "\"name\":\"myRecord\", "
        + "\"fields\":[ {\"name\":\"value\",\"type\":\"string\"} " + "]}");
    private static final CodecFactory DEFLATE = CodecFactory.deflateCodec(9);
    private static final CodecFactory SNAPPY = CodecFactory.snappyCodec();
  
    private GenericRecord aDatum(Type ofType, int forRow) {
      GenericRecord record;
      switch (ofType) {
      case STRING:
        record = new GenericData.Record(STRINGSCHEMA);
        record.put("value", String.valueOf(forRow % 100));
        return record;
      case INT:
        record = new GenericData.Record(INTSCHEMA);
        record.put("value", forRow);
        return record;
      default:
        throw new AssertionError("I can't generate data for this type");
      }
    }
  
    private File generateData(String file, Type type, Map<String, String> metadata, CodecFactory codec) throws Exception {
      File inputFile = new File(DIR, file);
      inputFile.deleteOnExit();
  
      Schema schema = null;
      if (type.equals(Schema.Type.INT)) {
        schema = INTSCHEMA;
      }
      if (type.equals(Schema.Type.STRING)) {
        schema = STRINGSCHEMA;
      }
  
      DataFileWriter<Object> writer = new DataFileWriter<>(new GenericDatumWriter<>(schema));
      for (Entry<String, String> metadatum : metadata.entrySet()) {
        writer.setMeta(metadatum.getKey(), metadatum.getValue());
      }
      writer.setCodec(codec);
      writer.create(schema, inputFile);
  
      for (int i = 0; i < ROWS_IN_INPUT_FILES; i++) {
        writer.append(aDatum(type, i));
      }
      writer.close();
  
      return inputFile;
    }
  
    private int getFirstIntDatum(File file) throws Exception {
      DataFileStream<GenericRecord> reader = new DataFileStream<>(new FileInputStream(file), new GenericDatumReader<>());
  
      int result = (Integer) reader.next().get(0);
      System.out.println(result);
      reader.close();
      return result;
    }
  
    private int numRowsInFile(File output) throws Exception {
      DataFileStream<GenericRecord> reader = new DataFileStream<>(new FileInputStream(output),
          new GenericDatumReader<>());
      Iterator<GenericRecord> rows = reader.iterator();
      int rowcount = 0;
      while (rows.hasNext()) {
        ++rowcount;
        rows.next();
      }
      reader.close();
      return rowcount;
    }
  
    @Test
    void cat() throws Exception {
      Map<String, String> metadata = new HashMap<>();
      metadata.put("myMetaKey", "myMetaValue");
  
      File input1 = generateData("input1.avro", Type.INT, metadata, DEFLATE);
      File input2 = generateData("input2.avro", Type.INT, metadata, SNAPPY);
      File input3 = generateData("input3.avro", Type.INT, metadata, DEFLATE);
  
      File output = new File(DIR, name.getMethodName() + ".avro");
      output.deleteOnExit();
  
  //    file input
      List<String> args = asList(input1.getAbsolutePath(), input2.getAbsolutePath(), input3.getAbsolutePath(), "--offset",
          String.valueOf(OFFSET), "--limit", String.valueOf(LIMIT_WITHIN_INPUT_BOUNDS), "--samplerate",
          String.valueOf(SAMPLERATE), output.getAbsolutePath());
      int returnCode = new CatTool().run(System.in, System.out, System.err, args);
      assertEquals(0, returnCode);
  
      assertEquals(LIMIT_WITHIN_INPUT_BOUNDS, numRowsInFile(output));
  
  //    folder input
      args = asList(input1.getParentFile().getAbsolutePath(), output.getAbsolutePath(), "--offset",
          String.valueOf(OFFSET), "--limit", String.valueOf(LIMIT_WITHIN_INPUT_BOUNDS));
      returnCode = new CatTool().run(System.in, System.out, System.err, args);
      assertEquals(0, returnCode);
      assertEquals(LIMIT_WITHIN_INPUT_BOUNDS, numRowsInFile(output));
  
  //    glob input
      args = asList(new File(input1.getParentFile(), "/*").getAbsolutePath(), output.getAbsolutePath(), "--offset",
          String.valueOf(OFFSET), "--limit", String.valueOf(LIMIT_WITHIN_INPUT_BOUNDS));
      returnCode = new CatTool().run(System.in, System.out, System.err, args);
      assertEquals(0, returnCode);
      assertEquals(LIMIT_WITHIN_INPUT_BOUNDS, numRowsInFile(output));
    }
  
    @Test
    void limitOutOfBounds() throws Exception {
      Map<String, String> metadata = new HashMap<>();
      metadata.put("myMetaKey", "myMetaValue");
  
      File input1 = generateData("input1.avro", Type.INT, metadata, DEFLATE);
      File output = new File(DIR, name.getMethodName() + ".avro");
      output.deleteOnExit();
  
      List<String> args = asList(input1.getAbsolutePath(), "--offset=" + String.valueOf(OFFSET),
          "--limit=" + String.valueOf(LIMIT_OUT_OF_INPUT_BOUNDS), output.getAbsolutePath());
      int returnCode = new CatTool().run(System.in, System.out, System.err, args);
      assertEquals(0, returnCode);
      assertEquals(ROWS_IN_INPUT_FILES - OFFSET, numRowsInFile(output));
    }
  
    @Test
    void samplerateAccuracy() throws Exception {
      Map<String, String> metadata = new HashMap<>();
      metadata.put("myMetaKey", "myMetaValue");
  
      File input1 = generateData("input1.avro", Type.INT, metadata, DEFLATE);
      File output = new File(DIR, name.getMethodName() + ".avro");
      output.deleteOnExit();
  
      List<String> args = asList(input1.getAbsolutePath(), output.getAbsolutePath(), "--offset", String.valueOf(OFFSET),
          "--samplerate", String.valueOf(SAMPLERATE));
      int returnCode = new CatTool().run(System.in, System.out, System.err, args);
      assertEquals(0, returnCode);
  
      assertTrue((ROWS_IN_INPUT_FILES - OFFSET) * SAMPLERATE - numRowsInFile(output) < 2,
          "Outputsize is not roughly (Inputsize - Offset) * samplerate");
      assertTrue((ROWS_IN_INPUT_FILES - OFFSET) * SAMPLERATE - numRowsInFile(output) > -2, "");
    }
  
    @Test
    void offSetAccuracy() throws Exception {
      Map<String, String> metadata = new HashMap<>();
      metadata.put("myMetaKey", "myMetaValue");
  
      File input1 = generateData("input1.avro", Type.INT, metadata, DEFLATE);
      File output = new File(DIR, name.getMethodName() + ".avro");
      output.deleteOnExit();
  
      List<String> args = asList(input1.getAbsolutePath(), "--offset", String.valueOf(OFFSET), "--limit",
          String.valueOf(LIMIT_WITHIN_INPUT_BOUNDS), "--samplerate", String.valueOf(SAMPLERATE),
          output.getAbsolutePath());
      int returnCode = new CatTool().run(System.in, System.out, System.err, args);
      assertEquals(0, returnCode);
      assertEquals(OFFSET, getFirstIntDatum(output), "output does not start at offset");
    }
  
    @Test
    void offsetBiggerThanInput() throws Exception {
      Map<String, String> metadata = new HashMap<>();
      metadata.put("myMetaKey", "myMetaValue");
  
      File input1 = generateData("input1.avro", Type.INT, metadata, DEFLATE);
      File output = new File(DIR, name.getMethodName() + ".avro");
      output.deleteOnExit();
  
      List<String> args = asList(input1.getAbsolutePath(), "--offset", String.valueOf(ROWS_IN_INPUT_FILES + 1),
          output.getAbsolutePath());
      int returnCode = new CatTool().run(System.in, System.out, System.err, args);
      assertEquals(0, returnCode);
      assertEquals(0, numRowsInFile(output), "output is not empty");
    }
  
    @Test
    void samplerateSmallerThanInput() throws Exception {
      Map<String, String> metadata = new HashMap<>();
      metadata.put("myMetaKey", "myMetaValue");
  
      File input1 = generateData("input1.avro", Type.INT, metadata, DEFLATE);
      File output = new File(DIR, name.getMethodName() + ".avro");
      output.deleteOnExit();
  
      List<String> args = asList(input1.getAbsolutePath(), output.getAbsolutePath(),
          "--offset=" + Integer.toString(OFFSET), "--samplerate=" + Double.toString(SAMPLERATE_TOO_SMALL));
      int returnCode = new CatTool().run(System.in, System.out, System.err, args);
      assertEquals(0, returnCode);
  
      assertEquals(OFFSET, getFirstIntDatum(output), "output should only contain the record at offset");
    }
  
    @Test
    void differentSchemasFail() throws Exception {
      assertThrows(IOException.class, () -> {
        Map<String, String> metadata = new HashMap<>();
        metadata.put("myMetaKey", "myMetaValue");
  
        File input1 = generateData("input1.avro", Type.STRING, metadata, DEFLATE);
        File input2 = generateData("input2.avro", Type.INT, metadata, DEFLATE);
  
        File output = new File(DIR, name.getMethodName() + ".avro");
        output.deleteOnExit();
  
        List<String> args = asList(input1.getAbsolutePath(), input2.getAbsolutePath(), output.getAbsolutePath());
        new CatTool().run(System.in, System.out, System.err, args);
      });
    }
  
    @Test
    void helpfulMessageWhenNoArgsGiven() throws Exception {
      ByteArrayOutputStream buffer = new ByteArrayOutputStream(1024);
      int returnCode;
      try (PrintStream out = new PrintStream(buffer)) {
        returnCode = new CatTool().run(System.in, out, System.err, Collections.emptyList());
      }
  
      assertEquals(0, returnCode);
      assertTrue(buffer.toString().trim().length() > 200, "should have lots of help");
    }
  }
  