/*
    * 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.IOException;
  import java.io.PrintWriter;
  import java.net.URI;
  import java.nio.file.Path;
  import java.util.Date;
  import java.util.List;
  import java.util.Map;
  import java.util.stream.StreamSupport;
  
  import org.apache.maven.index.reader.Record.Type;
  import org.junit.Ignore;
  import org.junit.Test;
  
  import static org.apache.maven.index.reader.TestUtils.expandFunction;
  import static org.hamcrest.MatcherAssert.assertThat;
  import static org.hamcrest.core.IsEqual.equalTo;
  import static org.hamcrest.core.IsNot.not;
  import static org.hamcrest.core.IsNull.nullValue;
  
  /**
   * UT for {@link IndexReader}
   */
  public class IndexReaderTest extends TestSupport {
      @Test
      public void simple() throws IOException {
          try (IndexReader indexReader = new IndexReader(null, testResourceHandler("simple"))) {
              assertThat(indexReader.getIndexId(), equalTo("apache-snapshots-local"));
              assertThat(indexReader.getPublishedTimestamp().getTime(), equalTo(1243533418015L));
              assertThat(indexReader.isIncremental(), equalTo(false));
              assertThat(indexReader.getChunkNames(), equalTo(List.of("nexus-maven-repository-index.gz")));
              int chunks = 0;
              int records = 0;
              for (ChunkReader chunkReader : indexReader) {
                  try (chunkReader) {
                      chunks++;
                      assertThat(chunkReader.getName(), equalTo("nexus-maven-repository-index.gz"));
                      assertThat(chunkReader.getVersion(), equalTo(1));
                      assertThat(chunkReader.getTimestamp().getTime(), equalTo(1243533418015L));
                      records = (int) StreamSupport.stream(chunkReader.spliterator(), false)
                              .map(expandFunction)
                              .count();
                  }
              }
  
              assertThat(chunks, equalTo(1));
              assertThat(records, equalTo(5));
          }
      }
  
      @Test
      public void simpleWithLocal() throws IOException {
          try (WritableResourceHandler writableResourceHandler = createWritableResourceHandler()) {
              try (IndexReader indexReader = new IndexReader(writableResourceHandler, testResourceHandler("simple"))) {
                  assertThat(indexReader.getIndexId(), equalTo("apache-snapshots-local"));
                  assertThat(indexReader.getPublishedTimestamp().getTime(), equalTo(1243533418015L));
                  assertThat(indexReader.isIncremental(), equalTo(false));
                  assertThat(indexReader.getChunkNames(), equalTo(List.of("nexus-maven-repository-index.gz")));
                  int chunks = 0;
                  int records = 0;
                  for (ChunkReader chunkReader : indexReader) {
                      try (chunkReader) {
                          chunks++;
                          assertThat(chunkReader.getName(), equalTo("nexus-maven-repository-index.gz"));
                          assertThat(chunkReader.getVersion(), equalTo(1));
                          assertThat(chunkReader.getTimestamp().getTime(), equalTo(1243533418015L));
                          records = (int) StreamSupport.stream(chunkReader.spliterator(), false)
                                  .map(expandFunction)
                                  .count();
                      }
                  }
  
                  assertThat(chunks, equalTo(1));
                  assertThat(records, equalTo(5));
              }
  
              assertThat(
                      writableResourceHandler
                              .locate("nexus-maven-repository-index.properties")
                              .read(),
                     not(nullValue()));
         }
     }
 
     @Test
     public void roundtrip() throws IOException {
         try (WritableResourceHandler writableResourceHandler = createWritableResourceHandler()) {
             Date published;
             IndexWriter iw; // TODO: fix this, IW close will set timestamp but ref to it is lost from try-with-res
             {
                 try (IndexReader indexReader = new IndexReader(null, testResourceHandler("simple"));
                         IndexWriter indexWriter =
                                 iw = new IndexWriter(writableResourceHandler, indexReader.getIndexId(), false)) {
                     for (ChunkReader chunkReader : indexReader) {
                         try (chunkReader) {
                             indexWriter.writeChunk(chunkReader.iterator());
                         }
                     }
                 }
                 published = iw.getPublishedTimestamp();
             }
 
             try (IndexReader indexReader = new IndexReader(null, writableResourceHandler)) {
                 assertThat(indexReader.getIndexId(), equalTo("apache-snapshots-local"));
                 assertThat(indexReader.getPublishedTimestamp().getTime(), equalTo(published.getTime()));
                 assertThat(indexReader.isIncremental(), equalTo(false));
                 assertThat(indexReader.getChunkNames(), equalTo(List.of("nexus-maven-repository-index.gz")));
                 int chunks = 0;
                 int records = 0;
                 for (ChunkReader chunkReader : indexReader) {
                     try (chunkReader) {
                         chunks++;
                         assertThat(chunkReader.getName(), equalTo("nexus-maven-repository-index.gz"));
                         assertThat(chunkReader.getVersion(), equalTo(1));
                         // assertThat(chunkReader.getTimestamp().getTime(), equalTo(1243533418015L));
                         records = (int) StreamSupport.stream(chunkReader.spliterator(), false)
                                 .map(expandFunction)
                                 .count();
                     }
                 }
 
                 assertThat(chunks, equalTo(1));
                 assertThat(records, equalTo(5));
             }
         }
     }
 
     /**
      * This UT is here for demonstration purposes only. Bashing Central is not something you want to do, and risk your
      * IP address being banned. You were warned!
      */
     @Test
     @Ignore("For eyes only")
     public void central() throws Exception {
         // local index location, against which we perform incremental updates
         final Path indexDir = createTempDirectory();
         // cache of remote, to not rely on HTTP transport possible failures, or, to detect them early
         final Path cacheDir = createTempDirectory();
 
         final PrintWriter writer = new PrintWriter(System.out, true);
 
         try (WritableResourceHandler local = new DirectoryResourceHandler(indexDir);
                 CachingResourceHandler remote = new CachingResourceHandler(
                         new DirectoryResourceHandler(cacheDir),
                         new HttpResourceHandler(URI.create("https://repo1.maven.org/maven2/.index/")));
                 IndexReader indexReader = new IndexReader(local, remote)) {
             writer.println("indexRepoId=" + indexReader.getIndexId());
             writer.println("indexLastPublished=" + indexReader.getPublishedTimestamp());
             writer.println("isIncremental=" + indexReader.isIncremental());
             writer.println("indexRequiredChunkNames=" + indexReader.getChunkNames());
             for (ChunkReader chunkReader : indexReader) {
                 writer.println("chunkName=" + chunkReader.getName());
                 writer.println("chunkVersion=" + chunkReader.getVersion());
                 writer.println("chunkPublished=" + chunkReader.getTimestamp());
                 writer.println("Chunk stats:");
                 Map<Type, Integer> stats = countRecordsByType(chunkReader);
                 for (Map.Entry<Type, Integer> entry : stats.entrySet()) {
                     writer.println(entry.getKey() + " = " + entry.getValue());
                 }
                 writer.println("= = = = = =");
             }
         }
     }
 }