/*
 * 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.accumulo.core.iterators.system;

import static java.nio.charset.StandardCharsets.UTF_8;
import static org.junit.jupiter.api.Assertions.assertEquals;
import static org.junit.jupiter.api.Assertions.assertFalse;
import static org.junit.jupiter.api.Assertions.assertSame;
import static org.junit.jupiter.api.Assertions.assertTrue;

import java.util.Collections;
import java.util.HashSet;
import java.util.TreeMap;

import org.apache.accumulo.core.data.Column;
import org.apache.accumulo.core.data.Key;
import org.apache.accumulo.core.data.Range;
import org.apache.accumulo.core.data.Value;
import org.apache.accumulo.core.iterators.SortedKeyValueIterator;
import org.apache.accumulo.core.iteratorsImpl.system.ColumnQualifierFilter;
import org.apache.accumulo.core.iteratorsImpl.system.SortedMapIterator;
import org.apache.hadoop.io.Text;
import org.junit.jupiter.api.Test;

public class ColumnFilterTest {

  Key newKey(String row, String cf, String cq) {
    return new Key(new Text(row), new Text(cf), new Text(cq));
  }

  Column newColumn(String cf) {
    return new Column(cf.getBytes(UTF_8), null, null);
  }

  Column newColumn(String cf, String cq) {
    return new Column(cf.getBytes(UTF_8), cq.getBytes(UTF_8), null);
  }

  @Test
  public void test1() {
    TreeMap<Key,Value> data = new TreeMap<>();
    data.put(newKey("r1", "cf1", "cq1"), new Value(""));
    data.put(newKey("r1", "cf2", "cq1"), new Value(""));

    HashSet<Column> columns = new HashSet<>();
    columns.add(newColumn("cf1"));

    SortedMapIterator smi = new SortedMapIterator(data);
    SortedKeyValueIterator<Key,Value> cf = ColumnQualifierFilter.wrap(smi, columns);

    assertSame(smi, cf);
  }

  @Test
  public void test2() throws Exception {

    TreeMap<Key,Value> data = new TreeMap<>();
    data.put(newKey("r1", "cf1", "cq1"), new Value(""));
    data.put(newKey("r1", "cf2", "cq1"), new Value(""));
    data.put(newKey("r1", "cf2", "cq2"), new Value(""));

    HashSet<Column> columns = new HashSet<>();

    columns.add(newColumn("cf1"));
    columns.add(newColumn("cf2", "cq1"));

    SortedKeyValueIterator<Key,Value> cf =
        ColumnQualifierFilter.wrap(new SortedMapIterator(data), columns);
    cf.seek(new Range(), Collections.emptySet(), false);

    assertTrue(cf.hasTop());
    assertEquals(newKey("r1", "cf1", "cq1"), cf.getTopKey());
    cf.next();
    assertTrue(cf.hasTop());
    assertEquals(newKey("r1", "cf2", "cq1"), cf.getTopKey());
    cf.next();
    assertFalse(cf.hasTop());
  }

  @Test
  public void test3() throws Exception {

    TreeMap<Key,Value> data = new TreeMap<>();
    data.put(newKey("r1", "cf1", "cq1"), new Value(""));
    data.put(newKey("r1", "cf2", "cq1"), new Value(""));
    data.put(newKey("r1", "cf2", "cq2"), new Value(""));

    HashSet<Column> columns = new HashSet<>();

    columns.add(newColumn("cf2", "cq1"));

    SortedKeyValueIterator<Key,Value> cf =
        ColumnQualifierFilter.wrap(new SortedMapIterator(data), columns);
    cf.seek(new Range(), Collections.emptySet(), false);

    assertTrue(cf.hasTop());
    assertEquals(newKey("r1", "cf2", "cq1"), cf.getTopKey());
    cf.next();
    assertFalse(cf.hasTop());
  }
}
