/*
 * Licensed to the Apache Software Foundation (ASF) under one
 * or more contributor license agreements.  See the NOTICE file
 * distributed with this work for additional information
 * regarding copyright ownership.  The ASF licenses this file
 * to you 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 org.apache.tuscany.das.rdb.impl;

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

import org.apache.log4j.Logger;
import org.apache.tuscany.das.rdb.util.LoggerFactory;

public class ConnectionImpl {

    private final Logger logger = LoggerFactory.INSTANCE.getLogger(ConnectionImpl.class);

    private Connection connection;

    private boolean managingTransaction = true;

    private final boolean useGetGeneratedKeys;

    public ConnectionImpl(Connection connection) {
        this.connection = connection;

        try {
            DatabaseMetaData dbmd = connection.getMetaData();

            if (dbmd.getDatabaseProductName().contains("Oracle")) {
                this.useGetGeneratedKeys = false;
            } else {
                this.useGetGeneratedKeys = true;
            }
            if (connection.getAutoCommit()) {
                throw new RuntimeException("AutoCommit must be off");
            }
        } catch (SQLException e) {
            throw new RuntimeException(e);
        }

    }

    public Connection getJDBCConnection() {
        return connection;
    }

    public void cleanUp() {
        try {
            if (managingTransaction) {
                if (this.logger.isDebugEnabled()) {
                    this.logger.debug("Committing Transaction");
                }
                connection.commit();
            }
        } catch (SQLException e) {
            throw new RuntimeException(e);
        }
    }

    public void errorCleanUp() {
        try {
            if (managingTransaction) {
                if (this.logger.isDebugEnabled()) {
                    this.logger.debug("Rolling back Transaction");
                }
                connection.rollback();
            }
        } catch (SQLException e) {
            throw new RuntimeException(e);
        }
    }

    public PreparedStatement prepareStatement(String queryString, String[] returnKeys) throws SQLException {
        if (this.logger.isDebugEnabled()) {
            this.logger.debug("Preparing Statement: " + queryString);
        }

        if (useGetGeneratedKeys) {
            return connection.prepareStatement(queryString, Statement.RETURN_GENERATED_KEYS);
        } else if (returnKeys.length > 0) {
            return connection.prepareStatement(queryString, returnKeys);
        }

        return connection.prepareStatement(queryString);
    }

    public PreparedStatement preparePagedStatement(String queryString) throws SQLException {
        if (this.logger.isDebugEnabled()) {
            this.logger.debug("Preparing Statement: " + queryString);
        }

        return connection.prepareStatement(queryString, ResultSet.TYPE_SCROLL_INSENSITIVE, ResultSet.CONCUR_READ_ONLY);
    }

    public void setManageTransactions(boolean manageTransactions) {
        managingTransaction = manageTransactions;

    }

    public CallableStatement prepareCall(String queryString) throws SQLException {
        return connection.prepareCall(queryString);
    }

    public boolean useGetGeneratedKeys() {
        return this.useGetGeneratedKeys;
    }
}