/**
 * $RCSfile$
 * $Revision: $
 * $Date: $
 *
 * Copyright (C) 2005-2008 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.openfire.sip.calllog;

import java.sql.Connection;
import java.sql.PreparedStatement;
import java.sql.ResultSet;
import java.sql.SQLException;
import java.util.ArrayList;
import java.util.Collection;
import java.util.Date;
import java.util.List;

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

/**
 * Database persistence for CallLog class and database methods for call log store
 *
 * @author Thiago Rocha Camargo
 */
public class CallLogDAO {

	private static final Logger Log = LoggerFactory.getLogger(CallLogDAO.class);

    final static CallFilter emptyFilter = new CallFilter("", new ArrayList<String>());

    /**
     * Return every stored calls that matches to the SQLCondition in the interval between startIndex and endIndex
     *
     * @param filter     the content of a SQL "Where" clause.
     * @param startIndex start index of results
     * @param numResults number of resultes to return
     * @return Collection<CallLog>;
     */
    public static Collection<CallLog> getCalls(CallFilter filter,
                                               int startIndex, int numResults) {

        String sql = "SELECT * FROM ofSipPhoneLog";

        sql = filter != null && !filter.getSQL().equals("") ? sql
                + " WHERE " + filter.getSQL() : sql;

        sql += " ORDER BY datetime DESC";

        List<CallLog> calls = new ArrayList<CallLog>(numResults);
        Connection con = null;
        PreparedStatement pstmt = null;
        try {
            con = DbConnectionManager.getConnection();
            pstmt = DbConnectionManager.createScrollablePreparedStatement(con,
                    sql);

            int i = 1;
            for (String value : filter.getValues()) {
                pstmt.setString(i++, value);
            }

            ResultSet rs = pstmt.executeQuery();
            DbConnectionManager.setFetchSize(rs, startIndex + numResults);
            DbConnectionManager.scrollResultSet(rs, startIndex);
            int count = 0;
            while (rs.next() && count < numResults) {
                calls.add(read(rs));
                count++;
            }
            rs.close();
        } catch (SQLException e) {
            Log.error(e.getMessage(), e);
        } finally {
            try {
                if (pstmt != null) {
                    pstmt.close();
                }
            } catch (Exception e) {
                Log.error(e.getMessage(), e);
            }
            try {
                if (con != null) {
                    con.close();
                }
            } catch (Exception e) {
                Log.error(e.getMessage(), e);
            }
        }
        return calls;
    }


    /**
     * Read a callLog result set and return a CallLog instance with the information of the resultSet
     *
     * @param rs ResultSet
     * @return CallLog
     */
    private static CallLog read(ResultSet rs) {
        CallLog callLog = null;
        try {

            String username = rs.getString("username");
            String numA = rs.getString("addressFrom");
            String numB = rs.getString("addressTo");
            long dateTime = rs.getLong("datetime");
            int duration = rs.getInt("duration");
            String callType = rs.getString("calltype");
            if ("loss".equals(callType)) {
                // Backwards compatibility change
                callType = "missed";
            }
            CallLog.Type type = CallLog.Type.valueOf(callType);

            callLog = new CallLog(username);

            callLog.setNumA(numA);
            callLog.setNumB(numB);
            callLog.setDateTime(dateTime);
            callLog.setDuration(duration);
            callLog.setType(type);

        } catch (SQLException e) {
            Log.error(e.getMessage(), e);
        }
        return callLog;
    }

    /**
     * Insert a new CallLog into the database
     *
     * @param callLog call logging
     * @throws SQLException
     */
    public static void insert(CallLog callLog) throws SQLException {

        String sql = "INSERT INTO ofSipPhoneLog (username, addressFrom, addressTo, datetime, duration, calltype) "
                + " values  (?, ?, ?, ?, ?, ?)";

        Connection con = null;
        PreparedStatement psmt = null;
        ResultSet rs = null;

        try {
            con = DbConnectionManager.getConnection();
            psmt = con.prepareStatement(sql);
            psmt.setString(1, callLog.getUsername());
            psmt.setString(2, callLog.getNumA());
            psmt.setString(3, callLog.getNumB());
            psmt.setLong(4, callLog.getDateTime());
            psmt.setInt(5, callLog.getDuration());
            psmt.setString(6, callLog.getType().name());

            psmt.executeUpdate();

        } catch (SQLException e) {
            Log.error(e.getMessage(), e);
            throw new SQLException(e.getMessage());
        } finally {
            DbConnectionManager.closeConnection(rs, psmt, con);
        }

    }

    /**
     * Gets all calls in database for the given range
     *
     * @param startIndex
     * @param numResults
     * @return Collection<CallLog>
     */
    public static Collection<CallLog> getCalls(int startIndex, int numResults) {
        return getCalls(emptyFilter, startIndex, numResults);
    }

    /**
     * Return the number of callLog stored
     *
     * @return int number
     */
    public static int getLogCount() {
        return getLogCount(emptyFilter);
    }

    /**
     * Return the number of store callLogs for the given SQLCondition
     *
     * @param filter call filter
     * @return int number
     */
    public static int getLogCount(CallFilter filter) {
        int count = 0;

        String sql = "SELECT count(*) FROM ofSipPhoneLog";

        sql = filter != null && !filter.getSQL().equals("") ? sql + " WHERE " + filter.getSQL()
                : sql;

        Connection con = null;
        PreparedStatement pstmt = null;
        try {
            con = DbConnectionManager.getConnection();
            pstmt = con.prepareStatement(sql);

            int i = 1;
            for (String value : filter.getValues()) {
                pstmt.setString(i++, value);
            }

            ResultSet rs = pstmt.executeQuery();
            if (rs.next()) {
                count = rs.getInt(1);
            }
            rs.close();
        } catch (SQLException e) {
            Log.error(e.getMessage(), e);
        } finally {
            try {
                if (pstmt != null) {
                    pstmt.close();
                }
            } catch (Exception e) {
                Log.error(e.getMessage(), e);
            }
            try {
                if (con != null) {
                    con.close();
                }
            } catch (Exception e) {
                Log.error(e.getMessage(), e);
            }
        }
        return count;
    }

    /**
     * Create a SQLFilter ( SQL Condition ) for CallLog entries
     *
     * @param username
     * @param numa
     * @param numb
     * @param callType
     * @param fromDate
     * @param uptoDate
     * @return String
     */
    public static CallFilter createSQLFilter(String username, String numa, String numb,
                                             String callType, Date fromDate, Date uptoDate) {

        ArrayList<String> conditions = new ArrayList<String>(10);
        ArrayList<String> values = new ArrayList<String>(10);

        if (username != null && !username.trim().equals("")) {
            conditions.add(" username = ? ");
            values.add(username.trim());
        }

        if (numa != null && !numa.trim().equals("")) {
            conditions.add(" addressFrom = ? ");
            values.add(numa.trim());
        }

        if (numb != null && !numb.trim().equals("")) {
            conditions.add(" addressTo = ? ");
            values.add(numb.trim());
        }

        if (fromDate != null) {
            conditions.add(" datetime >= ? ");
            values.add(String.valueOf(fromDate.getTime()));
        }

        if (uptoDate != null) {
            conditions.add(" datetime <= ? ");
            values.add(String.valueOf(uptoDate.getTime()));
        }

        if (callType != null && !callType.trim().equals("") && !callType.trim().equals("all")) {
            conditions.add(" calltype = ? ");
            values.add(callType.trim());
        }

        StringBuilder str = new StringBuilder();
        for (String aux : conditions) {
            if (str.length() > 0)
                str.append("AND");
            str.append(aux);
        }

        return new CallFilter(str.toString(), values);
    }

}