/*
    * 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.maven.index.reader;
  
  import java.io.File;
  import java.io.IOException;
  import java.nio.file.Files;
  import java.util.ArrayList;
  import java.util.HashMap;
  import java.util.List;
  import java.util.Map;
  
  import org.apache.maven.index.reader.Record.Type;
  import org.junit.After;
  import org.junit.Before;
  import org.junit.Rule;
  import org.junit.rules.TestName;
  
  import static org.hamcrest.MatcherAssert.assertThat;
  import static org.hamcrest.Matchers.equalTo;
  
  /**
   * Test support.
   */
  public class TestSupport {
      @Rule
      public TestName testName = new TestName();
  
      private File tempDir;
  
      private List<DirectoryResourceHandler> directoryResourceHandlers;
  
      /**
       * Creates the temp directory and list for resource handlers.
       */
      @Before
      public void setup() throws IOException {
          this.tempDir =
                  Files.createTempDirectory(getClass().getSimpleName() + ".temp").toFile();
          this.directoryResourceHandlers = new ArrayList<>();
      }
  
      /**
       * Closes all the registered resources handlers and deletes the temp directory.
       */
      @After
      public void cleanup() throws IOException {
          for (DirectoryResourceHandler directoryResourceHandler : directoryResourceHandlers) {
              directoryResourceHandler.close();
          }
          // delete(tempDir);
      }
  
      /**
       * Creates a temp file within {@link #tempDir} with given name.
       */
      protected File createTempFile(final String name) throws IOException {
          File file = new File(tempDir, name);
          file.deleteOnExit();
          return file;
      }
  
      /**
       * Creates a temp directory within {@link #tempDir}.
       */
      protected File createTempDirectory() throws IOException {
          return Files.createTempDirectory(tempDir.toPath(), testName.getMethodName() + "-dir")
                  .toFile();
      }
  
      /**
       * Creates an empty {@link DirectoryResourceHandler}.
       */
      protected WritableResourceHandler createWritableResourceHandler() throws IOException {
          DirectoryResourceHandler result = new DirectoryResourceHandler(createTempDirectory());
          directoryResourceHandlers.add(result);
          return result;
      }
  
      /**
       * Creates a "test" {@link ResourceHandler} that contains predefined files, is mapped to test resources under given
       * name.
       */
     protected DirectoryResourceHandler testResourceHandler(final String name) throws IOException {
         DirectoryResourceHandler result = new DirectoryResourceHandler(new File("src/test/resources/" + name));
         directoryResourceHandlers.add(result);
         return result;
     }
 
     /**
      * Consumes {@link ChunkReader} and creates a map "by type" with records.
      */
     protected Map<Type, List<Record>> loadRecordsByType(final ChunkReader chunkReader) throws IOException {
         HashMap<Type, List<Record>> stat = new HashMap<>();
         try (chunkReader) {
             assertThat(chunkReader.getVersion(), equalTo(1));
             final RecordExpander recordExpander = new RecordExpander();
             for (Map<String, String> rec : chunkReader) {
                 final Record record = recordExpander.apply(rec);
                 if (!stat.containsKey(record.getType())) {
                     stat.put(record.getType(), new ArrayList<>());
                 }
                 stat.get(record.getType()).add(record);
             }
         }
         return stat;
     }
 
     /**
      * Consumes {@link ChunkReader} and creates a map "by type" with record type counts.
      */
     protected Map<Type, Integer> countRecordsByType(final ChunkReader chunkReader) throws IOException {
         HashMap<Type, Integer> stat = new HashMap<>();
         try (chunkReader) {
             assertThat(chunkReader.getVersion(), equalTo(1));
             final RecordExpander recordExpander = new RecordExpander();
             for (Map<String, String> rec : chunkReader) {
                 final Record record = recordExpander.apply(rec);
                 if (!stat.containsKey(record.getType())) {
                     stat.put(record.getType(), 0);
                 }
                 stat.put(record.getType(), stat.get(record.getType()) + 1);
             }
         }
         return stat;
     }
 }