/*
 * Copyright 2022-2024 the original author or authors.
 *
 * 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
 *
 *      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 xyz.zhouxy.jdbc;

import java.sql.ResultSet;
import java.sql.ResultSetMetaData;
import java.sql.SQLException;
import java.util.HashMap;
import java.util.Map;

/**
 * RowMapper
 *
 * <p>
 * {@link ResultSet} 中每一行数据的处理逻辑。
 * </p>
 *
 * @author <a href="http://zhouxy.xyz:3000/ZhouXY108">ZhouXY</a>
 * @since 1.0.0
 */
@FunctionalInterface
public interface RowMapper<T> {
    T mapRow(ResultSet rs, int rowNumber) throws SQLException;

    /** 每一行数据转换为 {@link HashMap} */
    public static final RowMapper<Map<String, Object>> HASH_MAP_MAPPER = (rs, rowNumber) -> {
        Map<String, Object> result = new HashMap<>();
        ResultSetMetaData metaData = rs.getMetaData();
        int columnCount = metaData.getColumnCount();
        for (int i = 1; i <= columnCount; i++) {
            String colName = metaData.getColumnName(i);
            result.put(colName, rs.getObject(colName));
        }
        return result;
    };

    /** 每一行数据转换为 {@link DbRecord} */
    public static final RowMapper<DbRecord> RECORD_MAPPER =
            (rs, rowNumber) -> new DbRecord(HASH_MAP_MAPPER.mapRow(rs, rowNumber));

    /** 默认实现的将 {@link ResultSet} 转换为 Java Bean 的 {@link RowMapper}。 */
    public static <T> RowMapper<T> beanRowMapper(Class<T> beanType) throws SQLException {
        return DefaultBeanRowMapper.of(beanType);
    }

    /** 默认实现的将 {@link ResultSet} 转换为 Java Bean 的 {@link RowMapper}。 */
    public static <T> RowMapper<T> beanRowMapper(Class<T> beanType, Map<String, String> propertyColMap)
            throws SQLException {
        return DefaultBeanRowMapper.of(beanType, propertyColMap);
    }
}