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/*******************************************************************************
 * Copyright 2012 Anteros Tecnologia
 * 
 * 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 br.com.anteros.persistence.handler;

import java.sql.ResultSet;
import java.util.LinkedHashMap;
import java.util.Map;

import br.com.anteros.core.utils.ObjectUtils;
import br.com.anteros.core.utils.ReflectionUtils;
import br.com.anteros.persistence.metadata.EntityCacheException;
import br.com.anteros.persistence.metadata.descriptor.DescriptionColumn;
import br.com.anteros.persistence.metadata.descriptor.DescriptionField;

public class ElementMapHandler implements ResultSetHandler {

	private DescriptionField descriptionField;

	public ElementMapHandler(DescriptionField descriptionField) {
		this.descriptionField = descriptionField;
	}

	@SuppressWarnings({ "rawtypes", "unchecked" })
	public Object handle(ResultSet rs) throws Exception {
		Map mapResult = null;
		Object keyValue = null;
		Object value = null;
		if (rs.next()) {
			mapResult = new LinkedHashMap();
			do {
				for (DescriptionColumn descriptionColumn : descriptionField.getDescriptionColumns()) {
					if (!descriptionColumn.isPrimaryKey()) {
						/*
						 * Obtém a chave do map e aplica um convert se existir
						 */
						keyValue = descriptionField.getMapKeyColumn().convertToEntityAttribute(
								rs.getObject(descriptionField.getMapKeyColumn().getColumnName()));

						/*
						 * Obtém o valor do map e aplica um convert se existir
						 */
						value = descriptionField.getElementColumn().convertToEntityAttribute(
								rs.getObject(descriptionField.getElementColumn().getColumnName()));

						/*
						 * Se for um Enum e o mesmo foi configurado com EnumValues faz o a conversão conforme
						 * configurado
						 */
						if (descriptionColumn.getEnumType() != null) {
							if (!"".equals(value) && (value != null)) {
								String enumValue = descriptionColumn.getEnumValue((String) value);
								if ((enumValue == null) || (enumValue.equals(""))) {
									throw new EntityCacheException("Valor "
											+ value
											+ " não encontrado na lista do Enum do campo "
											+ descriptionField.getName()
											+ (descriptionField.getEntityCache() == null ? "" : " da classe "
													+ descriptionField.getEntityCache().getEntityClass().getName()) + ". Verifique se o tipo enum "
											+ descriptionField.getField().getType()
											+ "  foi customizado e se foi adicionado na lista de classes anotadas.");
								}
								/*
								 * Realiza o de/para do valor obtito no banco de dados para o Enum usando o valor
								 * configurado no EnumValue.
								 */
								keyValue = Enum.valueOf((Class) ReflectionUtils.getEnumKeyTypedMap(descriptionField.getField()),
										enumValue);
								/*
								 * Adiciona a chave/valor no map
								 */
								mapResult.put(keyValue, value);
							}
						} else {
							/*
							 * Adiciona a chave/valor no map
							 */
							mapResult.put(ObjectUtils.convert(keyValue, ReflectionUtils.getEnumKeyTypedMap(descriptionField.getField())), value);
						}
					}
				}

			} while (rs.next());
		}
		return mapResult;
	}

}