/*
 * (c) Copyright Ascensio System SIA 2010-2015
 *
 * This program is a free software product. You can redistribute it and/or 
 * modify it under the terms of the GNU Affero General Public License (AGPL) 
 * version 3 as published by the Free Software Foundation. In accordance with 
 * Section 7(a) of the GNU AGPL its Section 15 shall be amended to the effect 
 * that Ascensio System SIA expressly excludes the warranty of non-infringement
 * of any third-party rights.
 *
 * This program is distributed WITHOUT ANY WARRANTY; without even the implied 
 * warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR  PURPOSE. For 
 * details, see the GNU AGPL at: http://www.gnu.org/licenses/agpl-3.0.html
 *
 * You can contact Ascensio System SIA at Lubanas st. 125a-25, Riga, Latvia,
 * EU, LV-1021.
 *
 * The  interactive user interfaces in modified source and object code versions
 * of the Program must display Appropriate Legal Notices, as required under 
 * Section 5 of the GNU AGPL version 3.
 *
 * Pursuant to Section 7(b) of the License you must retain the original Product
 * logo when distributing the program. Pursuant to Section 7(e) we decline to
 * grant you any rights under trademark law for use of our trademarks.
 *
 * All the Product's GUI elements, including illustrations and icon sets, as
 * well as technical writing content are licensed under the terms of the
 * Creative Commons Attribution-ShareAlike 4.0 International. See the License
 * terms at http://creativecommons.org/licenses/by-sa/4.0/legalcode
 *
 */
 var sqlDataBaseType = {
    mySql: "mysql",
    postgreSql: "postgres"
};
var config = require("./config.json");
var configSql = config["sql"];
var baseConnector = (sqlDataBaseType.mySql === configSql["type"]) ? require("./mySqlBaseConnector") : require("./postgreSqlBaseConnector");
var tableChanges = configSql["tableChanges"],
tableCallbacks = configSql["tableCallbacks"],
tableResult = configSql["tableResult"],
tablePucker = configSql["tablePucker"];
var g_oCriticalSection = {};
var maxPacketSize = configSql["max_allowed_packet"];
function getDataFromTable(tableId, data, getCondition, callback) {
    var table = getTableById(tableId);
    var sqlCommand = "SELECT " + data + " FROM " + table + " WHERE " + getCondition + ";";
    baseConnector.sqlQuery(sqlCommand, callback);
}
function deleteFromTable(tableId, deleteCondition) {
    var table = getTableById(tableId);
    var sqlCommand = "DELETE FROM " + table + " WHERE " + deleteCondition + ";";
    baseConnector.sqlQuery(sqlCommand);
}
var c_oTableId = {
    pucker: 1,
    callbacks: 2,
    changes: 3
};
function getTableById(id) {
    var res;
    switch (id) {
    case c_oTableId.pucker:
        res = tablePucker;
        break;
    case c_oTableId.callbacks:
        res = tableCallbacks;
        break;
    case c_oTableId.changes:
        res = tableChanges;
        break;
    }
    return res;
}
exports.tableId = c_oTableId;
exports.loadTable = function (tableId, callbackFunction) {
    var table = getTableById(tableId);
    var sqlCommand = "SELECT * FROM " + table + ";";
    baseConnector.sqlQuery(sqlCommand, callbackFunction);
};
exports.insertInTable = function (tableId) {
    var table = getTableById(tableId);
    var sqlCommand = "INSERT INTO " + table + " VALUES (";
    for (var i = 1, l = arguments.length; i < l; ++i) {
        sqlCommand += "'" + arguments[i] + "'";
        if (i !== l - 1) {
            sqlCommand += ",";
        }
    }
    sqlCommand += ");";
    baseConnector.sqlQuery(sqlCommand);
};
exports.insertChanges = function (objChanges, docId, index, user) {
    lockCriticalSection(docId, function () {
        _insertChanges(0, objChanges, docId, index, user);
    });
};
function _lengthInUtf8Bytes(s) {
    return~ - encodeURI(s).split(/%..|./).length;
}
function _getDateTime(nTime) {
    var oDate = new Date(nTime);
    return oDate.getUTCFullYear() + "-" + ("0" + (oDate.getUTCMonth() + 1)).slice(-2) + "-" + ("0" + oDate.getUTCDate()).slice(-2) + " " + ("0" + oDate.getUTCHours()).slice(-2) + ":" + ("0" + oDate.getUTCMinutes()).slice(-2) + ":" + ("0" + oDate.getUTCSeconds()).slice(-2);
}
function _insertChanges(startIndex, objChanges, docId, index, user) {
    var sqlCommand = "INSERT INTO " + tableChanges + " VALUES";
    var i = startIndex,
    l = objChanges.length,
    sqlNextRow = "",
    lengthUtf8Current = 0,
    lengthUtf8Row = 0;
    if (i === l) {
        return;
    }
    for (; i < l; ++i, ++index) {
        sqlNextRow = "('" + docId + "','" + index + "','" + user.id + "','" + user.idOriginal + "'," + baseConnector.sqlEscape(user.name) + ",'" + objChanges[i].change + "','" + _getDateTime(objChanges[i].time) + "')";
        lengthUtf8Row = _lengthInUtf8Bytes(sqlNextRow) + 1;
        if (i === startIndex) {
            lengthUtf8Current = _lengthInUtf8Bytes(sqlCommand);
            sqlCommand += sqlNextRow;
        } else {
            if (lengthUtf8Row + lengthUtf8Current >= maxPacketSize) {
                sqlCommand += ";";
                (function (tmpStart, tmpIndex) {
                    baseConnector.sqlQuery(sqlCommand, function () {
                        _insertChanges(tmpStart, objChanges, docId, tmpIndex, user);
                    });
                })(i, index);
                return;
            } else {
                sqlCommand += ",";
                sqlCommand += sqlNextRow;
            }
        }
        lengthUtf8Current += lengthUtf8Row;
    }
    sqlCommand += ";";
    baseConnector.sqlQuery(sqlCommand, function () {
        unLockCriticalSection(docId);
    });
}
exports.deleteChanges = function (docId, deleteIndex) {
    lockCriticalSection(docId, function () {
        _deleteChanges(docId, deleteIndex);
    });
};
function _deleteChanges(docId, deleteIndex) {
    var sqlCommand = "DELETE FROM " + tableChanges + " WHERE dc_key='" + docId + "'";
    if (null !== deleteIndex) {
        sqlCommand += " AND dc_change_id >= " + deleteIndex;
    }
    sqlCommand += ";";
    baseConnector.sqlQuery(sqlCommand, function () {
        unLockCriticalSection(docId);
    });
}
exports.deleteCallback = function (docId) {
    deleteFromTable(c_oTableId.callbacks, "dc_key='" + docId + "'");
};
exports.deletePucker = function (docId) {
    deleteFromTable(c_oTableId.pucker, "dp_key='" + docId + "'");
};
exports.getChanges = function (docId, callback) {
    lockCriticalSection(docId, function () {
        _getChanges(docId, callback);
    });
};
function _getChanges(docId, callback) {
    getDataFromTable(c_oTableId.changes, "*", "dc_key='" + docId + "'", function (error, result) {
        unLockCriticalSection(docId);
        if (callback) {
            callback(error, result);
        }
    });
}
exports.checkStatusFile = function (docId, callbackFunction) {
    var sqlCommand = "SELECT tr_status FROM " + tableResult + " WHERE tr_key='" + docId + "';";
    baseConnector.sqlQuery(sqlCommand, callbackFunction);
};
exports.updateStatusFile = function (docId) {
    var sqlCommand = "UPDATE " + tableResult + " SET tr_status=1 WHERE tr_key='" + docId + "';";
    baseConnector.sqlQuery(sqlCommand);
};
exports.updateIndexUser = function (docId, indexUser) {
    var sqlCommand = "UPDATE " + tablePucker + " SET dp_indexUser=" + indexUser + " WHERE dp_key='" + docId + "' AND dp_indexUser<" + indexUser + ";";
    baseConnector.sqlQuery(sqlCommand);
};
exports.isLockCriticalSection = function (id) {
    return !! (g_oCriticalSection[id]);
};
function lockCriticalSection(id, callback) {
    if (g_oCriticalSection[id]) {
        g_oCriticalSection[id].push(callback);
        return;
    }
    g_oCriticalSection[id] = [];
    g_oCriticalSection[id].push(callback);
    callback();
}
function unLockCriticalSection(id) {
    var arrCallbacks = g_oCriticalSection[id];
    arrCallbacks.shift();
    if (0 < arrCallbacks.length) {
        arrCallbacks[0]();
    } else {
        delete g_oCriticalSection[id];
    }
}