/**
 * Copyright (C) 2004-2006 Jive Software. 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.jivesoftware.xmpp.workgroup.utils;

import java.sql.Connection;
import java.sql.PreparedStatement;
import java.util.Date;

import org.jivesoftware.database.DbConnectionManager;
import org.jivesoftware.util.StringUtils;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

/**
 * Handles basic DB Operations.
 */
public class DbWorkgroup {

	private static final Logger Log = LoggerFactory.getLogger(DbWorkgroup.class);
	
    private static final String UPDATE_TRANSCRIPT =
            "UPDATE fpSession SET transcript=?, endTime=? WHERE sessionID=?";
    private static final String INSERT_AGENT_SESSION =
            "INSERT INTO fpAgentSession(sessionID, agentJID, joinTime, leftTime) VALUES(?,?,?,?)";
    private static final String UPDATE_AGENT_SESSION =
            "UPDATE fpAgentSession SET leftTime=? WHERE sessionID=? AND agentJID=?";

    private DbWorkgroup() {
        // Empty Private Constructor for Utility class.
    }

    /**
     * Updates a chat transcript.
     *
     * @param sessionID  the sessionID belonging to the chat transcript.
     * @param transcript the chat transcript (XML)
     * @param endTime    the time the chat ended.
     */
    public static void updateTranscript(String sessionID, String transcript, Date endTime) {
        Connection con = null;
        PreparedStatement pstmt = null;
        try {
            con = DbConnectionManager.getConnection();
            pstmt = con.prepareStatement(UPDATE_TRANSCRIPT);

            DbConnectionManager.setLargeTextField(pstmt, 1, transcript);
            pstmt.setString(2, StringUtils.dateToMillis(endTime));
            pstmt.setString(3, sessionID);
            pstmt.executeUpdate();
        }
        catch (Exception e) {
            Log.error(e.getMessage(), e);
        }
        finally {
            DbConnectionManager.closeConnection(pstmt, con);
        }
    }

    /**
     * Updates the Joined Session.
     *
     * @param sessionID the sessionID.
     * @param agent the agent who joined.
     * @param joining true if they are joining, false if leaving.
     */
    public static void updateJoinedSession(String sessionID, String agent, boolean joining) {
        Connection con = null;
        PreparedStatement pstmt = null;
        try {
            Date time = new Date();
            con = DbConnectionManager.getConnection();

            if (joining) {
                pstmt = con.prepareStatement(INSERT_AGENT_SESSION);
                pstmt.setString(1, sessionID);
                pstmt.setString(2, agent);
                pstmt.setString(3, StringUtils.dateToMillis(time));
                pstmt.setString(4, "");
            }
            else {
                pstmt = con.prepareStatement(UPDATE_AGENT_SESSION);
                pstmt.setString(1, StringUtils.dateToMillis(time));
                pstmt.setString(2, sessionID);
                pstmt.setString(3, agent);
            }
            pstmt.executeUpdate();
        }
        catch (Exception ex) {
            Log.error(ex.getMessage(), ex);
        }
        finally {
           DbConnectionManager.closeConnection(pstmt, con);
        }
    }
}