/*
 * 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.iceberg;

import org.apache.iceberg.types.Types;
import org.mockito.Mockito;

class StatsTestUtil {
  private StatsTestUtil() {}

  /**
   * Mocks a {@link FieldStats} for a stats struct type, stubbing the bounds and only the counts
   * that are present. A null count leaves the matching {@code has*Count()} reporting false, so a
   * column that does not track a metric can be modeled without constructing an invalid struct.
   */
  @SuppressWarnings("unchecked")
  static FieldStats<Object> mockFieldStats(
      Types.StructType type,
      int id,
      Object lower,
      Object upper,
      Long valueCount,
      Long nullCount,
      Long nanCount) {
    FieldStats<Object> stats = Mockito.mock(FieldStats.class);
    Mockito.when(stats.fieldId()).thenReturn(id);
    Mockito.when(stats.type()).thenReturn(type);
    Mockito.when(stats.lowerBound()).thenReturn(lower);
    Mockito.when(stats.upperBound()).thenReturn(upper);
    Mockito.when(stats.hasValueCount()).thenReturn(valueCount != null);
    Mockito.when(stats.hasNullValueCount()).thenReturn(nullCount != null);
    Mockito.when(stats.hasNanValueCount()).thenReturn(nanCount != null);
    if (valueCount != null) {
      Mockito.when(stats.valueCount()).thenReturn(valueCount);
    }

    if (nullCount != null) {
      Mockito.when(stats.nullValueCount()).thenReturn(nullCount);
    }

    if (nanCount != null) {
      Mockito.when(stats.nanValueCount()).thenReturn(nanCount);
    }

    return stats;
  }
}
