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/*
 * Copyright 2015, The Querydsl Team (http://www.querydsl.com/team)
 *
 * Licensed 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 com.querydsl.sql.dml;

import com.querydsl.core.QueryException;
import com.querydsl.core.types.Path;
import com.querydsl.core.util.ReflectionUtils;
import com.querydsl.sql.RelationalPath;
import com.querydsl.sql.types.Null;
import java.lang.reflect.Field;
import java.lang.reflect.Modifier;
import java.util.LinkedHashMap;
import java.util.Map;

/**
 * Creates the mapping by inspecting the RelationalPath and Object via reflection. Given bean
 * doesn't need to have @Column metadata, but the fields need to have the same name as in the given
 * relational path.
 *
 * @author tiwe
 */
public class DefaultMapper extends AbstractMapper {

  public static final DefaultMapper DEFAULT = new DefaultMapper(false);

  public static final DefaultMapper WITH_NULL_BINDINGS = new DefaultMapper(true);

  private final boolean withNullBindings;

  public DefaultMapper() {
    this(false);
  }

  public DefaultMapper(boolean withNullBindings) {
    this.withNullBindings = withNullBindings;
  }

  @Override
  public Map, Object> createMap(RelationalPath entity, Object bean) {
    try {
      Map, Object> values = new LinkedHashMap<>();
      Class beanClass = bean.getClass();
      var columns = getColumns(entity);
      // populate in column order
      for (Map.Entry> entry : columns.entrySet()) {
        Path path = entry.getValue();
        Field beanField = ReflectionUtils.getFieldOrNull(beanClass, entry.getKey());
        if (beanField != null && !Modifier.isStatic(beanField.getModifiers())) {
          beanField.setAccessible(true);
          var propertyValue = beanField.get(bean);
          if (propertyValue != null) {
            values.put(path, propertyValue);
          } else if (withNullBindings && !isPrimaryKeyColumn(entity, path)) {
            values.put(path, Null.DEFAULT);
          }
        }
      }
      return values;
    } catch (IllegalAccessException e) {
      throw new QueryException(e);
    }
  }
}