/*
 * Copyright Amazon.com, Inc. or its affiliates. All Rights Reserved.
 *
 * Licensed under the Apache License, Version 2.0 (the "License").
 * You may not use this file except in compliance with the License.
 * A copy of the License is located at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * or in the "license" file accompanying this file. This file 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 software.aws.neptune.gremlin.resultset;

import software.aws.neptune.gremlin.GremlinTypeMapping;
import software.aws.neptune.jdbc.ResultSetMetaData;
import java.sql.SQLException;
import java.util.List;

/**
 * Gremlin implementation of ResultSetMetadata.
 */
public class GremlinResultSetMetadata extends ResultSetMetaData
        implements java.sql.ResultSetMetaData {
    private final List<Class<?>> columnTypes;

    /**
     * GremlinResultSetMetadata constructor.
     *
     * @param columns     List of column names.
     * @param columnTypes List of column types.
     */
    public GremlinResultSetMetadata(final List<String> columns, final List<Class<?>> columnTypes) {
        super(columns);
        this.columnTypes = columnTypes;
    }

    /**
     * Get Gremlin type of a given column.
     *
     * @param column the 1-based column index.
     * @return Bolt Type Object for column.
     */
    protected Class<?> getColumnGremlinType(final int column) {
        // TODO: Loop rows to find common type and cache it.
        return columnTypes.get(column - 1);
    }

    @Override
    public int getColumnType(final int column) throws SQLException {
        verifyColumnIndex(column);
        return GremlinTypeMapping.getJDBCType(getColumnGremlinType(column)).getJdbcCode();
    }

    @Override
    public String getColumnTypeName(final int column) throws SQLException {
        verifyColumnIndex(column);
        return getColumnGremlinType(column).getName();
    }

    @Override
    public String getColumnClassName(final int column) throws SQLException {
        verifyColumnIndex(column);
        return getColumnGremlinType(column).getName();
    }
}