/*
 * ============LICENSE_START==========================================
 * org.onap.music
 * ===================================================================
 *  Copyright (c) 2017 AT&T Intellectual Property
 *  Modifications Copyright (C) 2019 IBM.
 * ===================================================================
 *  Modifications Copyright (c) 2019 Samsung
 * ===================================================================
 *  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.
 *
 * ============LICENSE_END=============================================
 * ====================================================================
 */

package org.onap.music.datastore;

import java.util.HashMap;
import java.util.Map;

import org.onap.music.eelf.logging.EELFLoggerDelegate;
import org.onap.music.exceptions.MusicServiceException;
import org.onap.music.main.MusicUtil;

import com.datastax.driver.core.KeyspaceMetadata;
import com.datastax.driver.core.ResultSet;
import com.datastax.driver.core.TableMetadata;

public class MusicDataStoreHandle {

    private static MusicDataStore mDstoreHandle = null;
    private static EELFLoggerDelegate logger = EELFLoggerDelegate.getLogger(MusicDataStoreHandle.class);

    private MusicDataStoreHandle(){
        throw new IllegalStateException("Utility class");
    }

    /**
    *
    * @param remoteIp
    * @return
    */
    public static MusicDataStore getDSHandle(String remoteIp) {
        logger.info(EELFLoggerDelegate.metricsLogger,"Acquiring data store handle");
        long start = System.currentTimeMillis();
        if (mDstoreHandle == null) {
            mDstoreHandle = new MusicDataStore(remoteIp);
        }
        long end = System.currentTimeMillis();
        logger.info(EELFLoggerDelegate.metricsLogger,"Time taken to acquire data store handle:" + (end - start) + " ms");
        return mDstoreHandle;
    }

   /**
    *
    * @return
    * @throws MusicServiceException
    */
    public static MusicDataStore getDSHandle() throws MusicServiceException {
        logger.info(EELFLoggerDelegate.metricsLogger,"Acquiring data store handle");
        long start = System.currentTimeMillis();
        if (mDstoreHandle == null) {
            // Quick Fix - Best to put this into every call to getDSHandle?
           if (!"localhost".equals(MusicUtil.getMyCassaHost())) {
                mDstoreHandle = new MusicDataStore(MusicUtil.getMyCassaHost());
            } else {
                mDstoreHandle = new MusicDataStore();
            }
        }
        if(mDstoreHandle.getSession() == null) {
            String message = "Connection to Cassandra has not been enstablished."
                + " Please check connection properites and reboot.";
            logger.info(EELFLoggerDelegate.applicationLogger, message);
            throw new MusicServiceException(message);
        }
        long end = System.currentTimeMillis();
        logger.info(EELFLoggerDelegate.metricsLogger,"Time taken to acquire data store handle:" + (end - start) + " ms");
        return mDstoreHandle;
    }

    public static void setMDstoreHandle(MusicDataStore dsHandle) {
        mDstoreHandle = dsHandle;
    }

   /**
   *
   * @param keyspace
   * @param tablename
   * @return
   * @throws MusicServiceException
   */
    public static TableMetadata returnColumnMetadata(String keyspace, String tablename) throws MusicServiceException {
        return getDSHandle().returnColumnMetadata(keyspace, tablename);
    }
    
    /**
    *
    * @param keyspace
    * @param tablename
    * @return
    * @throws MusicServiceException
    */
     public static KeyspaceMetadata returnkeyspaceMetadata(String keyspace) throws MusicServiceException {
         return getDSHandle().returnKeyspaceMetadata(keyspace);
     }

  /**
  *
  * @param results
  * @return
  * @throws MusicServiceException
  */
    public static Map<String, HashMap<String, Object>> marshallResults(ResultSet results) throws MusicServiceException {
        return getDSHandle().marshalData(results);
    }

}