/*
 * 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.facebook.presto.plugin.postgresql;

import com.facebook.presto.plugin.jdbc.BaseJdbcClient;
import com.facebook.presto.plugin.jdbc.BaseJdbcConfig;
import com.facebook.presto.plugin.jdbc.JdbcConnectorId;
import com.facebook.presto.plugin.jdbc.JdbcOutputTableHandle;
import com.google.common.base.Throwables;
import org.postgresql.Driver;

import javax.inject.Inject;

import java.sql.Connection;
import java.sql.DatabaseMetaData;
import java.sql.PreparedStatement;
import java.sql.ResultSet;
import java.sql.SQLException;

public class PostgreSqlClient
        extends BaseJdbcClient
{
    @Inject
    public PostgreSqlClient(JdbcConnectorId connectorId, BaseJdbcConfig config)
            throws SQLException
    {
        super(connectorId, config, "\"", new Driver());
    }

    @Override
    public void commitCreateTable(JdbcOutputTableHandle handle)
    {
        // PostgreSQL does not allow qualifying the target of a rename
        StringBuilder sql = new StringBuilder()
                .append("ALTER TABLE ")
                .append(quoted(handle.getCatalogName(), handle.getSchemaName(), handle.getTemporaryTableName()))
                .append(" RENAME TO ")
                .append(quoted(handle.getTableName()));

        try (Connection connection = getConnection(handle)) {
            execute(connection, sql.toString());
        }
        catch (SQLException e) {
            throw Throwables.propagate(e);
        }
    }

    @Override
    public PreparedStatement getPreparedStatement(Connection connection, String sql)
            throws SQLException
    {
        connection.setAutoCommit(false);
        PreparedStatement statement = connection.prepareStatement(sql);
        statement.setFetchSize(1000);
        return statement;
    }

    @Override
    protected ResultSet getTables(Connection connection, String schemaName, String tableName)
            throws SQLException
    {
        DatabaseMetaData metadata = connection.getMetaData();
        String escape = metadata.getSearchStringEscape();
        return metadata.getTables(
                connection.getCatalog(),
                escapeNamePattern(schemaName, escape),
                escapeNamePattern(tableName, escape),
                new String[] {"TABLE", "VIEW", "MATERIALIZED VIEW"});
    }
}