/*
 * MIT License
 *
 * Copyright (c) 2020-present Cloudogu GmbH and Contributors
 *
 * Permission is hereby granted, free of charge, to any person obtaining a copy
 * of this software and associated documentation files (the "Software"), to deal
 * in the Software without restriction, including without limitation the rights
 * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
 * copies of the Software, and to permit persons to whom the Software is
 * furnished to do so, subject to the following conditions:
 *
 * The above copyright notice and this permission notice shall be included in all
 * copies or substantial portions of the Software.
 *
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
 * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
 * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
 * SOFTWARE.
 */

package sonia.scm.search;

import com.google.common.base.Strings;
import org.apache.lucene.index.IndexableField;

import java.lang.reflect.Field;
import java.lang.reflect.InvocationTargetException;
import java.lang.reflect.Method;

import static java.util.Collections.emptySet;

final class FieldConverter {

  private final Method getter;
  private final IndexableFieldFactory fieldFactory;
  private final String name;

  FieldConverter(Field field, Method getter, Indexed indexed, IndexableFieldFactory fieldFactory) {
    this.getter = getter;
    this.fieldFactory = fieldFactory;
    this.name = createName(field, indexed);
  }

  private String createName(Field field, Indexed indexed) {
    String nameFromAnnotation = indexed.name();
    if (Strings.isNullOrEmpty(nameFromAnnotation)) {
      return field.getName();
    }
    return nameFromAnnotation;
  }

  Iterable<IndexableField> convert(Object object) throws IllegalAccessException, InvocationTargetException {
    Object value = getter.invoke(object);
    if (value != null) {
      return fieldFactory.create(name, value);
    }
    return emptySet();
  }

}
