/*
 * Copyright (c) 2015, WSO2 Inc. (http://www.wso2.org) All Rights Reserved.
 *
 * WSO2 Inc. 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.wso2.carbon.device.mgt.mobile.android.impl.dao.util;

import org.apache.commons.logging.Log;
import org.apache.commons.logging.LogFactory;

import javax.naming.InitialContext;
import javax.sql.DataSource;
import java.sql.Connection;
import java.sql.PreparedStatement;
import java.sql.ResultSet;
import java.sql.SQLException;
import java.util.Hashtable;
import java.util.List;

/**
 * Utility method required by MobileDeviceManagement DAO classes.
 */
public class MobileDeviceManagementDAOUtil {

    private static final Log log = LogFactory.getLog(MobileDeviceManagementDAOUtil.class);

    public static DataSource lookupDataSource(String dataSourceName,
                                              final Hashtable<Object, Object> jndiProperties){

        try {
            if (jndiProperties == null || jndiProperties.isEmpty()) {
                return (DataSource) InitialContext.doLookup(dataSourceName);
            }
            final InitialContext context = new InitialContext(jndiProperties);
            return (DataSource) context.lookup(dataSourceName);
        } catch (Exception e) {
            String msg = "Error in looking up data source: " + e.getMessage();
            log.error(msg, e);
            throw new RuntimeException(msg + e.getMessage(), e);
        }
    }

    public static void cleanupResources(Connection conn, PreparedStatement stmt, ResultSet rs) {
        if (rs != null) {
            try {
                rs.close();
            } catch (SQLException e) {
                log.warn("Error occurred while closing result set", e);
            }
        }
        if (stmt != null) {
            try {
                stmt.close();
            } catch (SQLException e) {
                log.warn("Error occurred while closing prepared statement", e);
            }
        }
        if (conn != null) {
            try {
                conn.close();
            } catch (SQLException e) {
                log.warn("Error occurred while closing database connection", e);
            }
        }
    }

    public static void cleanupResources(PreparedStatement stmt, ResultSet rs) {
        cleanupResources(null, stmt, rs);
    }

//    /**
//     * Creates the mobile device management schema.
//     *
//     * @param dataSource Mobile data source
//     */
//    public static void setupMobileDeviceManagementSchema(DataSource dataSource, String pluginType) throws MobileDeviceMgtPluginException {
//        MobileDeviceManagementSchemaInitializer initializer =
//                new MobileDeviceManagementSchemaInitializer(dataSource, pluginType);
//        String checkSql = "select * from ";
//        if (pluginType.equalsIgnoreCase("android")) {
//            checkSql += "AD_DEVICE";
//        } else if (pluginType.equalsIgnoreCase("windows")) {
//            checkSql += "WIN_DEVICE";
//        } else {
//            checkSql += "IOS_DEVICE";
//        }
//        try {
//            if (!initializer.isDatabaseStructureCreated(checkSql)) {
//                log.info("Initializing mobile device management repository database schema for : " + pluginType);
//                initializer.createRegistryDatabase();
//            } else {
//                log.info("Mobile device management repository database for " + pluginType
//                        + " already exists. Not creating a new database.");
//            }
//        } catch (Exception e) {
//            throw new MobileDeviceMgtPluginException("Error occurred while initializing Mobile Device " +
//                                                "Management database schema", e);
//        }
//    }
//
//
//    /**
//     * Resolve data source from the data source definition
//     *
//     * @param config data source configuration
//     * @return data source resolved from the data source definition
//     */
//    private static DataSource resolveDataSource(MobileDataSourceConfig config) {
//        DataSource dataSource = null;
//        if (config == null) {
//            throw new RuntimeException(
//                    "data source configuration " + "is null and " +
//                            "thus, is not initialized");
//        }
//        JNDILookupDefinition jndiConfig = config.getJndiLookupDefinition();
//        if (jndiConfig != null) {
//            if (log.isDebugEnabled()) {
//                log.debug("Initializing data source using the JNDI " +
//                        "Lookup Definition");
//            }
//            List<JNDILookupDefinition.JNDIProperty> jndiPropertyList =
//                    jndiConfig.getJndiProperties();
//            if (jndiPropertyList != null) {
//                Hashtable<Object, Object> jndiProperties = new Hashtable<Object, Object>();
//                for (JNDILookupDefinition.JNDIProperty prop : jndiPropertyList) {
//                    jndiProperties.put(prop.getName(), prop.getValue());
//                }
//                dataSource = MobileDeviceManagementDAOUtil.lookupDataSource(jndiConfig.getJndiName(), jndiProperties);
//            } else {
//                dataSource = MobileDeviceManagementDAOUtil.lookupDataSource(jndiConfig.getJndiName(), null);
//            }
//        }
//        return dataSource;
//    }
}
