/**
 *  Copyright (c) 2008, WSO2 Inc. (http://www.wso2.org) 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.
 *  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.mediator.dbreport;

import java.rmi.RemoteException;
import java.util.ArrayList;
import java.util.Iterator;
import java.util.List;

import javax.servlet.ServletConfig;
import javax.servlet.http.HttpSession;
import javax.xml.namespace.QName;

import org.apache.axiom.om.OMElement;
import org.apache.axis2.AxisFault;
import org.apache.axis2.client.Options;
import org.apache.axis2.client.ServiceClient;
import org.apache.axis2.context.ConfigurationContext;
import org.wso2.carbon.CarbonConstants;
import org.wso2.carbon.ndatasource.ui.stub.*;
import org.wso2.carbon.ndatasource.ui.stub.core.services.xsd.WSDataSourceInfo;
import org.wso2.carbon.ui.CarbonUIUtil;
import org.wso2.carbon.utils.ServerConstants;

/**
 * This class is used to get defined carbon datasources. It uses
 * 'DataSourceAdminStub' to do backend call.
 *
 */
public class DBReportMediatorClient {
    private NDataSourceAdminStub stub;

    public DBReportMediatorClient(String cookie, String backendServerURL,
                                  ConfigurationContext configCtx)throws AxisFault {
        String serviceURL = backendServerURL + "NDataSourceAdmin";
        stub = new NDataSourceAdminStub(configCtx, serviceURL);
        ServiceClient client = stub._getServiceClient();
        Options option = client.getOptions();
        option.setManageSession(true);
        option.setProperty(org.apache.axis2.transport.http.HTTPConstants.COOKIE_STRING, cookie);
    }

    public static DBReportMediatorClient getInstance(ServletConfig config, HttpSession session)
            throws AxisFault {

        String backendServerURL = CarbonUIUtil.getServerURL(config.getServletContext(), session);
        ConfigurationContext configContext =
                (ConfigurationContext) config.getServletContext()
                        .getAttribute(CarbonConstants.CONFIGURATION_CONTEXT);

        String cookie = (String) session.getAttribute(ServerConstants.ADMIN_SERVICE_COOKIE);
        return new DBReportMediatorClient(cookie, backendServerURL, configContext);
    }

    public List<String> getAllDataSourceInformations() throws RemoteException,
            NDataSourceAdminDataSourceException {

        WSDataSourceInfo wsDataSourceInfo[] = stub.getAllDataSources();

        List<String> sourceList = new ArrayList<String>();
        if (wsDataSourceInfo == null || wsDataSourceInfo.length == 0) {
            return sourceList;
        }

        for(WSDataSourceInfo info : wsDataSourceInfo) {
            if (info.getDsMetaInfo().getJndiConfig() != null) {
                sourceList.add(info.getDsMetaInfo().getJndiConfig().getName());
            }
        }

        return sourceList;
    }
}
