/*
 * Copyright (c) 2016, 2018, Oracle and/or its affiliates. All rights reserved.
 *
 * This program is free software; you can redistribute it and/or modify it under
 * the terms of the GNU General Public License, version 2.0, as published by the
 * Free Software Foundation.
 *
 * This program is also distributed with certain software (including but not
 * limited to OpenSSL) that is licensed under separate terms, as designated in a
 * particular file or component or in included license documentation. The
 * authors of MySQL hereby grant you an additional permission to link the
 * program and your derivative works with the separately licensed software that
 * they have included with MySQL.
 *
 * Without limiting anything contained in the foregoing, this file, which is
 * part of MySQL Connector/J, is also subject to the Universal FOSS Exception,
 * version 1.0, a copy of which can be found at
 * http://oss.oracle.com/licenses/universal-foss-exception.
 *
 * This program is distributed in the hope that it will be useful, but WITHOUT
 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
 * FOR A PARTICULAR PURPOSE. See the GNU General Public License, version 2.0,
 * for more details.
 *
 * You should have received a copy of the GNU General Public License along with
 * this program; if not, write to the Free Software Foundation, Inc.,
 * 51 Franklin St, Fifth Floor, Boston, MA 02110-1301  USA
 */

package com.mysql.cj.jdbc.result;

import java.sql.SQLException;

import com.mysql.cj.exceptions.ExceptionFactory;
import com.mysql.cj.exceptions.WrongArgumentException;
import com.mysql.cj.jdbc.JdbcConnection;
import com.mysql.cj.jdbc.StatementImpl;
import com.mysql.cj.protocol.ProtocolEntity;
import com.mysql.cj.protocol.ProtocolEntityFactory;
import com.mysql.cj.protocol.Resultset;
import com.mysql.cj.protocol.Resultset.Concurrency;
import com.mysql.cj.protocol.Resultset.Type;
import com.mysql.cj.protocol.ResultsetRows;
import com.mysql.cj.protocol.a.NativePacketPayload;
import com.mysql.cj.protocol.a.result.OkPacket;
import com.mysql.cj.protocol.a.result.ResultsetRowsCursor;

public class ResultSetFactory implements ProtocolEntityFactory<ResultSetImpl, NativePacketPayload> {

    private JdbcConnection conn;
    private StatementImpl stmt;

    private Type type = Type.FORWARD_ONLY;
    private Concurrency concurrency = Concurrency.READ_ONLY;

    public ResultSetFactory(JdbcConnection connection, StatementImpl creatorStmt) throws SQLException {
        this.conn = connection;
        this.stmt = creatorStmt;

        if (creatorStmt != null) {
            this.type = Type.fromValue(creatorStmt.getResultSetType(), Type.FORWARD_ONLY);
            this.concurrency = Concurrency.fromValue(creatorStmt.getResultSetConcurrency(), Concurrency.READ_ONLY);
        }
    }

    @Override
    public Resultset.Type getResultSetType() {
        return this.type;
    }

    @Override
    public Resultset.Concurrency getResultSetConcurrency() {
        return this.concurrency;
    }

    @Override
    public int getFetchSize() {
        try {
            return this.stmt.getFetchSize();
        } catch (SQLException ex) {
            throw ExceptionFactory.createException(ex.getMessage(), ex);
        }
    }

    @Override
    public ResultSetImpl createFromProtocolEntity(ProtocolEntity protocolEntity) {
        try {
            if (protocolEntity instanceof OkPacket) {
                return new ResultSetImpl((OkPacket) protocolEntity, this.conn, this.stmt);

            } else if (protocolEntity instanceof ResultsetRows) {
                int resultSetConcurrency = getResultSetConcurrency().getIntValue();
                int resultSetType = getResultSetType().getIntValue();

                return createFromResultsetRows(resultSetConcurrency, resultSetType, (ResultsetRows) protocolEntity);

            }
            throw ExceptionFactory.createException(WrongArgumentException.class, "Unknown ProtocolEntity class " + protocolEntity);

        } catch (SQLException ex) {
            throw ExceptionFactory.createException(ex.getMessage(), ex);
        }
    }

    /**
     * Build ResultSet from ResultsetRows
     * 
     * @param resultSetType
     *            scrollability (TYPE_FORWARD_ONLY, TYPE_SCROLL_????)
     * @param resultSetConcurrency
     *            the type of result set (CONCUR_UPDATABLE or READ_ONLY)
     * @param rows
     *            {@link ResultsetRows}
     * @return ResultSetImpl
     * @throws SQLException
     *             if an error occurs
     */
    public ResultSetImpl createFromResultsetRows(int resultSetConcurrency, int resultSetType, ResultsetRows rows) throws SQLException {

        ResultSetImpl rs;

        StatementImpl st = this.stmt;

        if (rows.getOwner() != null) {
            st = ((ResultSetImpl) rows.getOwner()).getOwningStatement();
        }

        switch (resultSetConcurrency) {
            case java.sql.ResultSet.CONCUR_UPDATABLE:
                rs = new UpdatableResultSet(rows, this.conn, st);
                break;

            default:
                // CONCUR_READ_ONLY
                rs = new ResultSetImpl(rows, this.conn, st);
                break;
        }

        rs.setResultSetType(resultSetType);
        rs.setResultSetConcurrency(resultSetConcurrency);

        if (rows instanceof ResultsetRowsCursor && st != null) {
            rs.setFetchSize(st.getFetchSize());
        }
        return rs;
    }

}
