/*
 * 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.accumulo.examples.filedata;

import static org.junit.jupiter.api.Assertions.assertEquals;
import static org.junit.jupiter.api.Assertions.assertFalse;

import java.io.IOException;
import java.util.ArrayList;
import java.util.List;
import java.util.Map.Entry;

import org.apache.accumulo.core.client.Accumulo;
import org.apache.accumulo.core.client.AccumuloClient;
import org.apache.accumulo.core.client.AccumuloException;
import org.apache.accumulo.core.client.AccumuloSecurityException;
import org.apache.accumulo.core.client.BatchWriter;
import org.apache.accumulo.core.client.BatchWriterConfig;
import org.apache.accumulo.core.client.Scanner;
import org.apache.accumulo.core.client.TableExistsException;
import org.apache.accumulo.core.client.TableNotFoundException;
import org.apache.accumulo.core.conf.Property;
import org.apache.accumulo.core.data.Key;
import org.apache.accumulo.core.data.KeyValue;
import org.apache.accumulo.core.data.Mutation;
import org.apache.accumulo.core.data.Value;
import org.apache.accumulo.core.security.Authorizations;
import org.apache.accumulo.core.security.ColumnVisibility;
import org.apache.accumulo.harness.AccumuloClusterHarness;
import org.apache.accumulo.miniclusterImpl.MiniAccumuloConfigImpl;
import org.apache.hadoop.conf.Configuration;
import org.apache.hadoop.io.Text;
import org.junit.jupiter.api.AfterEach;
import org.junit.jupiter.api.BeforeEach;
import org.junit.jupiter.api.Test;

import com.google.common.collect.Iterators;
import com.google.common.collect.PeekingIterator;

public class ChunkInputStreamIT extends AccumuloClusterHarness {

  @Override
  public void configureMiniCluster(MiniAccumuloConfigImpl cfg, Configuration hadoopCoreSite) {
    cfg.setProperty(Property.TSERV_NATIVEMAP_ENABLED, "false");
  }

  private static final Authorizations AUTHS = new Authorizations("A", "B", "C", "D");

  private AccumuloClient client;
  private String tableName;
  private List<Entry<Key,Value>> data;

  @BeforeEach
  public void setupInstance() throws Exception {
    client = Accumulo.newClient().from(getClientProps()).build();
    tableName = getUniqueNames(1)[0];
    client.securityOperations().changeUserAuthorizations(client.whoami(), AUTHS);
  }

  @AfterEach
  public void teardown() {
    client.close();
  }

  @BeforeEach
  public void setupData() {
    data = new ArrayList<>();
    addData(data, "a", "refs", "id\0ext", "A&B", "ext");
    addData(data, "a", "refs", "id\0name", "A&B", "name");
    addData(data, "a", "~chunk", 100, 0, "A&B", "asdfjkl;");
    addData(data, "a", "~chunk", 100, 1, "A&B", "");
    addData(data, "b", "refs", "id\0ext", "A&B", "ext");
    addData(data, "b", "refs", "id\0name", "A&B", "name");
    addData(data, "b", "~chunk", 100, 0, "A&B", "qwertyuiop");
    addData(data, "b", "~chunk", 100, 0, "B&C", "qwertyuiop");
    addData(data, "b", "~chunk", 100, 1, "A&B", "");
    addData(data, "b", "~chunk", 100, 1, "B&C", "");
    addData(data, "b", "~chunk", 100, 1, "D", "");
    addData(data, "c", "~chunk", 100, 0, "A&B", "asdfjkl;");
    addData(data, "c", "~chunk", 100, 1, "A&B", "asdfjkl;");
    addData(data, "c", "~chunk", 100, 2, "A&B", "");
    addData(data, "d", "~chunk", 100, 0, "A&B", "");
    addData(data, "e", "~chunk", 100, 0, "A&B", "asdfjkl;");
    addData(data, "e", "~chunk", 100, 1, "A&B", "");
    List<Entry<Key,Value>> baddata = new ArrayList<>();
    addData(baddata, "a", "~chunk", 100, 0, "A", "asdfjkl;");
    addData(baddata, "b", "~chunk", 100, 0, "B", "asdfjkl;");
    addData(baddata, "b", "~chunk", 100, 2, "C", "");
    addData(baddata, "c", "~chunk", 100, 0, "D", "asdfjkl;");
    addData(baddata, "c", "~chunk", 100, 2, "E", "");
    addData(baddata, "d", "~chunk", 100, 0, "F", "asdfjkl;");
    addData(baddata, "d", "~chunk", 100, 1, "G", "");
    addData(baddata, "d", "~zzzzz", "colq", "H", "");
    addData(baddata, "e", "~chunk", 100, 0, "I", "asdfjkl;");
    addData(baddata, "e", "~chunk", 100, 1, "J", "");
    addData(baddata, "e", "~chunk", 100, 2, "I", "asdfjkl;");
    addData(baddata, "f", "~chunk", 100, 2, "K", "asdfjkl;");
    addData(baddata, "g", "~chunk", 100, 0, "L", "");
    List<Entry<Key,Value>> multidata = new ArrayList<>();
    addData(multidata, "a", "~chunk", 100, 0, "A&B", "asdfjkl;");
    addData(multidata, "a", "~chunk", 100, 1, "A&B", "");
    addData(multidata, "a", "~chunk", 200, 0, "B&C", "asdfjkl;");
    addData(multidata, "b", "~chunk", 100, 0, "A&B", "asdfjkl;");
    addData(multidata, "b", "~chunk", 200, 0, "B&C", "asdfjkl;");
    addData(multidata, "b", "~chunk", 200, 1, "B&C", "asdfjkl;");
    addData(multidata, "c", "~chunk", 100, 0, "A&B", "asdfjkl;");
    addData(multidata, "c", "~chunk", 100, 1, "B&C", "");
  }

  static void addData(List<Entry<Key,Value>> data, String row, String cf, String cq, String vis,
      String value) {
    data.add(new KeyValue(new Key(row, cf, cq, vis), value.getBytes()));
  }

  static void addData(List<Entry<Key,Value>> data, String row, String cf, int chunkSize,
      int chunkCount, String vis, String value) {
    Text chunkCQ = new Text(FileDataIngest.intToBytes(chunkSize));
    chunkCQ.append(FileDataIngest.intToBytes(chunkCount), 0, 4);
    data.add(new KeyValue(new Key(new Text(row), new Text(cf), chunkCQ, new Text(vis)),
        value.getBytes()));
  }

  @Test
  public void testWithAccumulo() throws AccumuloException, AccumuloSecurityException,
      TableExistsException, TableNotFoundException, IOException {
    client.tableOperations().create(tableName);
    try (BatchWriter bw = client.createBatchWriter(tableName, new BatchWriterConfig())) {
      for (Entry<Key,Value> e : data) {
        Key k = e.getKey();
        Mutation m = new Mutation(k.getRow());
        m.put(k.getColumnFamily(), k.getColumnQualifier(),
            new ColumnVisibility(k.getColumnVisibility()), e.getValue());
        bw.addMutation(m);
      }
    }

    try (Scanner scan = client.createScanner(tableName, AUTHS)) {

      byte[] b = new byte[20];
      int read;
      PeekingIterator<Entry<Key,Value>> pi = Iterators.peekingIterator(scan.iterator());

      try (ChunkInputStream cis = new ChunkInputStream(pi)) {
        assertEquals(8, read = cis.read(b));
        assertEquals("asdfjkl;", new String(b, 0, read));
        assertEquals(-1, cis.read(b));
      }

      try (ChunkInputStream cis = new ChunkInputStream(pi)) {
        assertEquals(10, read = cis.read(b));
        assertEquals("qwertyuiop", new String(b, 0, read));
        assertEquals(-1, cis.read(b));
        assertEquals("[A&B, B&C, D]", cis.getVisibilities().toString());
      }

      try (ChunkInputStream cis = new ChunkInputStream(pi)) {
        assertEquals(16, read = cis.read(b));
        assertEquals("asdfjkl;asdfjkl;", new String(b, 0, read));
        assertEquals(-1, cis.read(b));
        assertEquals("[A&B]", cis.getVisibilities().toString());
      }

      try (ChunkInputStream cis = new ChunkInputStream(pi)) {
        assertEquals(-1, cis.read(b));
      }

      try (ChunkInputStream cis = new ChunkInputStream(pi)) {
        assertEquals(8, read = cis.read(b));
        assertEquals("asdfjkl;", new String(b, 0, read));
        assertEquals(-1, cis.read(b));
      }

      assertFalse(pi.hasNext());
    }
  }

}