/*
*    Copyright [2011] [wisemapping]
*
*   Licensed under WiseMapping Public License, Version 1.0 (the "License").
*   It is basically the Apache License, Version 2.0 (the "License") plus the
*   "powered by wisemapping" text requirement on every single page;
*   you may not use this file except in compliance with the License.
*   You may obtain a copy of the license at
*
*       http://www.wisemapping.org/license
*
*   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.
*/

core.Monitor = function(fadeElement, logContentElem)
{
    $assert(fadeElement, "fadeElement can not be null");
    $assert(logContentElem, "logContentElem can not be null");

    this.pendingMessages = [];
    this.inProgress = false;
    this._container = fadeElement;
    this._currentMessage = null;
    this._logContentElem = logContentElem;

    this._fxOpacity = fadeElement.effect('opacity', { duration: 6000 });

};

core.Monitor.prototype._logMessage = function(msg, msgKind)
{
    this._fxOpacity.clearTimer();
    if (msgKind == core.Monitor.MsgKind.ERROR)
    {
        msg = "<div id='small_error_icon'>" + msg + "</div>";
    }
    this._currentMessage = msg;
    this._fxOpacity.start(1, 0);
    this._logContentElem.innerHTML = msg;

};

core.Monitor.prototype.logError = function(userMsg)
{
    this.logMessage(userMsg, core.Monitor.MsgKind.ERROR);
};

core.Monitor.prototype.logFatal = function(userMsg)
{
    this.logMessage(userMsg, core.Monitor.MsgKind.FATAL);
};

core.Monitor.prototype.logMessage = function(msg, msgKind)
{
    if (!msgKind)
    {
        msgKind = core.Monitor.MsgKind.INFO;
    }

    if (msgKind == core.Monitor.MsgKind.FATAL)
    {
        // In this case, a modal dialog must be shown... No recovery is possible.
        new Windoo.Alert(msg,
        {
            'window': {  theme:Windoo.Themes.aero,
                title:"Outch!!. An unexpected error.",
                'onClose':function() {
                }
            }
        });
    } else
    {
        var messages = this.pendingMessages;
        var monitor = this;

        if (!this.executer)
        {
            // Log current message ...
            monitor._logMessage(msg, msgKind);

            // Start worker thread ...
            var disptacher = function()
            {
                if (messages.length > 0)
                {
                    var msgToDisplay = messages.shift();
                    monitor._logMessage(msgToDisplay);
                }

                // Stop thread?
                if (messages.length == 0)
                {
                    $clear(monitor.executer);
                    monitor.executer = null;
                    monitor._fxOpacity.hide();
                    this._currentMessage = null;
                }
            };
            this.executer = disptacher.periodical(600);
        } else
        {
            if (this._currentMessage != msg)
            {
                messages.push(msg);
            }
        }
    }
};

core.Monitor.setInstance = function(monitor)
{
    this.monitor = monitor;
};

core.Monitor.getInstance = function()
{
    var result = this.monitor;
    if (result == null)
    {
        result = {
            logError: function() {
            },
            logMessage: function() {
            }
        };
    }
    return result;
};


core.Monitor.MsgKind =
{
    INFO:1,
    WARNING:2,
    ERROR:3,
    FATAL:4
};