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
   *
   *   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.asterix.column.common.test;
  
  import java.io.BufferedReader;
  import java.io.File;
  import java.io.FileInputStream;
  import java.io.FileNotFoundException;
  import java.io.FileReader;
  import java.io.IOException;
  import java.nio.file.Files;
  import java.nio.file.Path;
  import java.nio.file.Paths;
  import java.util.ArrayList;
  import java.util.Collection;
  import java.util.Collections;
  import java.util.HashMap;
  import java.util.List;
  import java.util.Map;
  import java.util.Objects;
  import java.util.Set;
  import java.util.function.Predicate;
  import java.util.stream.Collectors;
  
  import org.apache.asterix.external.parser.JSONDataParser;
  import org.apache.asterix.om.pointables.base.DefaultOpenFieldType;
  import org.apache.hyracks.api.exceptions.HyracksDataException;
  import org.apache.hyracks.api.util.IoUtil;
  
  import com.fasterxml.jackson.core.JsonFactory;
  
  public abstract class TestBase {
      public static final File OUTPUT_PATH;
      public static final File DATA_PATH;
  
      private static final File TESTS;
      private static final File RESULT_PATH;
      private static final Map<Class<?>, TestPath> TEST_PATH_MAP;
  
      protected final TestCase testCase;
      protected final JSONDataParser parser;
  
      static {
          TEST_PATH_MAP = new HashMap<>();
  
          ClassLoader classLoader = TestBase.class.getClassLoader();
          OUTPUT_PATH = new File("target", "result");
          TESTS = new File(Objects.requireNonNull(classLoader.getResource("only.txt")).getPath());
          DATA_PATH = new File(Objects.requireNonNull(classLoader.getResource("data")).getPath());
          RESULT_PATH = new File(Objects.requireNonNull(classLoader.getResource("result")).getPath());
      }
  
      protected TestBase(TestCase testCase) throws HyracksDataException {
          this.testCase = testCase;
          JsonFactory jsonFactory = new JsonFactory();
          parser = new JSONDataParser(DefaultOpenFieldType.NESTED_OPEN_RECORD_TYPE, jsonFactory);
      }
  
      protected void prepareParser(File testFile) throws IOException {
          //Prepare parser
          FileInputStream inputStream = new FileInputStream(testFile);
          parser.reset(inputStream);
      }
  
      protected static void setup(Class<?> clazz) throws IOException {
          TestPath path = TEST_PATH_MAP.get(clazz);
          if (!OUTPUT_PATH.exists()) {
              Files.createDirectory(Paths.get(OUTPUT_PATH.toURI()));
          }
          if (path.outputPath.exists()) {
              IoUtil.delete(path.outputPath);
          }
          Files.createDirectory(Paths.get(path.outputPath.toURI()));
      }
  
      protected static Collection<Object[]> initTests(Class<?> clazz, String testName) throws Exception {
          TestPath path = TEST_PATH_MAP.computeIfAbsent(clazz,
                  k -> new TestPath(new File(OUTPUT_PATH, testName), new File(RESULT_PATH, testName)));
          Set<String> only = getOnly();
          List<File> testFiles = listFiles(DATA_PATH, only);
          List<File> resultFiles = listFiles(path.resultPath, only);
  
          List<Object[]> testCases = new ArrayList<>();
          for (int i = 0; i < testFiles.size(); i++) {
              Object[] testCase = { new TestCase(testFiles.get(i), resultFiles.get(i), path.outputPath) };
              testCases.add(testCase);
          }
          return testCases;
      }
  
      public static List<File> listFiles(File path) throws IOException {
          return listFiles(path, Collections.emptySet());
      }
  
      private static List<File> listFiles(File path, Set<String> only) throws IOException {
          Predicate<File> predicate = f -> only.isEmpty() || only.contains(f.getName().split("\\.")[0]);
          return Files.list(Paths.get(path.toURI())).map(Path::toFile).filter(predicate).sorted(File::compareTo)
                  .collect(Collectors.toList());
      }
  
      private static Set<String> getOnly() throws FileNotFoundException {
          BufferedReader reader = new BufferedReader(new FileReader(TESTS));
          return reader.lines().filter(l -> !l.trim().isEmpty() && l.charAt(0) != '#').collect(Collectors.toSet());
      }
  
      private static class TestPath {
          private final File outputPath;
          private final File resultPath;
  
          TestPath(File outputPath, File resultPath) {
              this.outputPath = outputPath;
              this.resultPath = resultPath;
          }
      }
  }
  