/*
Copyright (c) 2006, Yahoo! Inc. All rights reserved.
Code licensed under the BSD License:
http://developer.yahoo.net/yui/license.txt
version: 0.11.0
*/

/****************************************************************************/

/****************************************************************************/

/****************************************************************************/

/**

 * Singleton providing core logging functionality. Saves logs written through the

 * global YAHOO.log function or written by LogWriter. Provides access to logs

 * for reading by LogReader. Log messages are automatically output to Firebug,

 * if present.

 *

 * requires YAHOO.util.Event Event utility

 */

YAHOO.widget.Logger = {

    // Initialize members

    loggerEnabled: true,

    _firebugEnabled: true,

    categories: ["info","warn","error","time","window"],

    sources: ["global"],

    _stack: [], // holds all log msgs

    _startTime: new Date().getTime(), // static start timestamp

    _lastTime: null // timestamp of last logged message

};



/***************************************************************************

 * Events

 ***************************************************************************/

/**

 * Fired when a new category has been created. Subscribers receive the following

 * array:<br>

 *     - args[0] The category name

 */

YAHOO.widget.Logger.categoryCreateEvent = new YAHOO.util.CustomEvent("categoryCreate", this, true);



/**

 * Fired when a new source has been named. Subscribers receive the following

 * array:<br>

 *     - args[0] The source name

 */

YAHOO.widget.Logger.sourceCreateEvent = new YAHOO.util.CustomEvent("sourceCreate", this, true);



/**

 * Fired when a new log message has been created. Subscribers receive the

 * following array:<br>

 *     - args[0] The log message

 */

YAHOO.widget.Logger.newLogEvent = new YAHOO.util.CustomEvent("newLog", this, true);



/**

 * Fired when the Logger has been reset has been created.

 */

YAHOO.widget.Logger.logResetEvent = new YAHOO.util.CustomEvent("logReset", this, true);



/***************************************************************************

 * Public methods

 ***************************************************************************/

/**

 * Saves a log message to the stack and fires newLogEvent. If the log message is

 * assigned to an unknown category, creates a new category. If the log message is

 * from an unknown source, creates a new source.  If Firebug is enabled,

 * outputs the log message to Firebug.

 *

 * @param {string} sMsg The log message

 * @param {string} sCategory Category of log message, or null

 * @param {string} sSource Source of LogWriter, or null if global

 */

YAHOO.widget.Logger.log = function(sMsg, sCategory, sSource) {

    if(this.loggerEnabled) {

        if(!sCategory) {

            sCategory = "info"; // default category

        }

        else if(this._isNewCategory(sCategory)) {

            this._createNewCategory(sCategory);

        }

        var sClass = "global"; // default source

        var sDetail = null;

        if(sSource) {

            var spaceIndex = sSource.indexOf(" ");

            if(spaceIndex > 0) {

                sClass = sSource.substring(0,spaceIndex);// substring until first space

                sDetail = sSource.substring(spaceIndex,sSource.length);// the rest of the source

            }

            else {

                sClass = sSource;

            }

            if(this._isNewSource(sClass)) {

                this._createNewSource(sClass);

            }

        }



        var timestamp = new Date();

        var logEntry = {

            time: timestamp,

            category: sCategory,

            source: sClass,

            sourceDetail: sDetail,

            msg: sMsg

        };



        this._stack.push(logEntry);

        this.newLogEvent.fire(logEntry);



        if(this._firebugEnabled) {

            this._printToFirebug(logEntry);

        }

        return true;

    }

    else {

        return false;

    }

};



/**

 * Resets internal stack and startTime, enables Logger, and fires logResetEvent.

 *

 */

YAHOO.widget.Logger.reset = function() {

    this._stack = [];

    this._startTime = new Date().getTime();

    this.loggerEnabled = true;

    this.log(null, "Logger reset");

    this.logResetEvent.fire();

};



/**

 * Public accessor to internal stack of log messages.

 *

 * @return {array} Array of log messages.

 */

YAHOO.widget.Logger.getStack = function() {

    return this._stack;

};



/**

 * Public accessor to internal start time.

 *

 * @return {date} Internal date of when Logger singleton was initialized.

 */

YAHOO.widget.Logger.getStartTime = function() {

    return this._startTime;

};



/**

 * Disables output to the Firebug Firefox extension.

 */

YAHOO.widget.Logger.disableFirebug = function() {

    YAHOO.log("YAHOO.Logger output to Firebug has been disabled.");

    this._firebugEnabled = false;

};



/**

 * Enables output to the Firebug Firefox extension.

 */

YAHOO.widget.Logger.enableFirebug = function() {

    this._firebugEnabled = true;

    YAHOO.log("YAHOO.Logger output to Firebug has been enabled.");

};



/***************************************************************************

 * Private methods

 ***************************************************************************/

/**

 * Creates a new category of log messages and fires categoryCreateEvent.

 *

 * @param {string} category Category name

 * @private

 */

YAHOO.widget.Logger._createNewCategory = function(category) {

    this.categories.push(category);

    this.categoryCreateEvent.fire(category);

};



/**

 * Checks to see if a category has already been created.

 *

 * @param {string} category Category name

 * @return {boolean} Returns true if category is unknown, else returns false

 * @private

 */

YAHOO.widget.Logger._isNewCategory = function(category) {

    for(var i=0; i < this.categories.length; i++) {

        if(category == this.categories[i]) {

            return false;

        }

    }

    return true;

};



/**

 * Creates a new source of log messages and fires sourceCreateEvent.

 *

 * @param {string} source Source name

 * @private

 */

YAHOO.widget.Logger._createNewSource = function(source) {

    this.sources.push(source);

    this.sourceCreateEvent.fire(source);

};



/**

 * Checks to see if a source has already been created.

 *

 * @param {string} source Source name

 * @return {boolean} Returns true if source is unknown, else returns false

 * @private

 */

YAHOO.widget.Logger._isNewSource = function(source) {

    if(source) {

        for(var i=0; i < this.sources.length; i++) {

            if(source == this.sources[i]) {

                return false;

            }

        }

        return true;

    }

};



/**

 * Outputs a log message to Firebug.

 *

 * @param {object} entry Log entry object

 * @private

 */

YAHOO.widget.Logger._printToFirebug = function(entry) {

    if(window.console && console.log) {

        var category = entry.category;

        var label = entry.category.substring(0,4).toUpperCase();



        var time = entry.time;

        if (time.toLocaleTimeString) {

            var localTime  = time.toLocaleTimeString();

        }

        else {

            localTime = time.toString();

        }



        var msecs = time.getTime();

        var elapsedTime = (YAHOO.widget.Logger._lastTime) ?

            (msecs - YAHOO.widget.Logger._lastTime) : 0;

        YAHOO.widget.Logger._lastTime = msecs;



        var output = //Firebug doesn't support HTML "<span class='"+category+"'>"+label+"</span> " +

            localTime + " (" +

            elapsedTime + "ms): " +

            entry.source + ": " +

            entry.msg;



        

        console.log(output);

    }

};



/***************************************************************************

 * Private event handlers

 ***************************************************************************/

/**

 * Handles logging of messages due to window error events.

 *

 * @param {string} msg The error message

 * @param {string} url URL of the error

 * @param {string} line Line number of the error

 * @private

 */

YAHOO.widget.Logger._onWindowError = function(msg,url,line) {

    // Logger is not in scope of this event handler

    try {

        YAHOO.widget.Logger.log(msg+' ('+url+', line '+line+')', "window");

        if(YAHOO.widget.Logger._origOnWindowError) {

            YAHOO.widget.Logger._origOnWindowError();

        }

    }

    catch(e) {

        return false;

    }

};



/**

 * Handle native JavaScript errors

 */

//NB: Not all browsers support the window.onerror event

if(window.onerror) {

    // Save any previously defined handler to call

    YAHOO.widget.Logger._origOnWindowError = window.onerror;

}

window.onerror = YAHOO.widget.Logger._onWindowError;



/**

 * First log

 */

YAHOO.widget.Logger.log("Logger initialized");



/****************************************************************************/

/****************************************************************************/

/****************************************************************************/

/**

 * Class providing ability to log messages through YAHOO.widget.Logger from a

 * named source.

 *

 * @constructor

 * @param {string} sSource Source of LogWriter instance

 */

YAHOO.widget.LogWriter = function(sSource) {

    if(!sSource) {

        YAHOO.log("Could not instantiate LogWriter due to invalid source.", "error", "LogWriter");

        return;

    }

    this._source = sSource;

 };



/***************************************************************************

 * Public methods

 ***************************************************************************/

 /**

 * Public accessor to the unique name of the LogWriter instance.

 *

 * @return {string} Unique name of the LogWriter instance

 */

YAHOO.widget.LogWriter.prototype.toString = function() {

    return "LogWriter " + this._sSource;

};



/**

 * Logs a message attached to the source of the LogWriter.

 *

 * @param {string} sMsg The log message

 * @param {string} sCategory Category name

 */

YAHOO.widget.LogWriter.prototype.log = function(sMsg, sCategory) {

    YAHOO.widget.Logger.log(sMsg, sCategory, this._source);

};



/**

 * Public accessor to get the source name.

 *

 * @return {string} The LogWriter source

 */

YAHOO.widget.LogWriter.prototype.getSource = function() {

    return this._sSource;

};



/**

 * Public accessor to set the source name.

 *

 * @param {string} sSource Source of LogWriter instance

 */

YAHOO.widget.LogWriter.prototype.setSource = function(sSource) {

    if(!sSource) {

        YAHOO.log("Could not set source due to invalid source.", "error", this.toString());

        return;

    }

    else {

        this._sSource = sSource;

    }

};

/***************************************************************************

 * Private members

 ***************************************************************************/

/**

 * Source of the log writer instance.

 *

 * @type string

 * @private

 */

YAHOO.widget.LogWriter.prototype._source = null;







/****************************************************************************/

/****************************************************************************/

/****************************************************************************/



/**

 * Class providing UI to read messages logged to YAHOO.widget.Logger.

 *

 * requires YAHOO.util.Dom DOM utility

 * requires YAHOO.util.Event Event utility

 * optional YAHOO.util.DragDrop Drag and drop utility

 *

 * @constructor

 * @param {el or ID} containerEl DOM element object or ID of container to wrap reader UI

 * @param {object} oConfig Optional object literal of configuration params

 */

YAHOO.widget.LogReader = function(containerEl, oConfig) {

    var oSelf = this;



    // Parse config vars here

    if (typeof oConfig == "object") {

        for(var param in oConfig) {

            this[param] = oConfig[param];

        }

    }



    // Attach container...

    if(containerEl) {

        if(typeof containerEl == "string") {

            this._containerEl = document.getElementById(containerEl);

        }

        else if(containerEl.tagName) {

            this._containerEl = containerEl;

        }

        this._containerEl.className = "yui-log";

    }

    // ...or create container from scratch

    if(!this._containerEl) {

        if(YAHOO.widget.LogReader._defaultContainerEl) {

            this._containerEl =  YAHOO.widget.LogReader._defaultContainerEl;

        }

        else {

            this._containerEl = document.body.appendChild(document.createElement("div"));

            this._containerEl.id = "yui-log";

            this._containerEl.className = "yui-log";



            YAHOO.widget.LogReader._defaultContainerEl = this._containerEl;

        }



        // If implementer has provided container values, trust and set those

        var containerStyle = this._containerEl.style;

        if(this.width) {

            containerStyle.width = this.width;

        }

        if(this.left) {

            containerStyle.left = this.left;

        }

        if(this.right) {

            containerStyle.right = this.right;

        }

        if(this.bottom) {

            containerStyle.bottom = this.bottom;

        }

        if(this.top) {

            containerStyle.top = this.top;

        }

        if(this.fontSize) {

            containerStyle.fontSize = this.fontSize;

        }

    }



    if(this._containerEl) {

        // Create header

        if(!this._hdEl) {

            this._hdEl = this._containerEl.appendChild(document.createElement("div"));

            this._hdEl.id = "yui-log-hd" + YAHOO.widget.LogReader._index;

            this._hdEl.className = "yui-log-hd";



            this._collapseEl = this._hdEl.appendChild(document.createElement("div"));

            this._collapseEl.className = "yui-log-btns";



            this._collapseBtn = document.createElement("input");

            this._collapseBtn.type = "button";

            this._collapseBtn.style.fontSize = YAHOO.util.Dom.getStyle(this._containerEl,"fontSize");

            this._collapseBtn.className = "yui-log-button";

            this._collapseBtn.value = "Collapse";

            this._collapseBtn = this._collapseEl.appendChild(this._collapseBtn);

            YAHOO.util.Event.addListener(oSelf._collapseBtn,'click',oSelf._onClickCollapseBtn,oSelf);



            this._title = this._hdEl.appendChild(document.createElement("h4"));

            this._title.innerHTML = "Logger Console";



            // If Drag and Drop utility is available...

            // ...and this container was created from scratch...

            // ...then make the header draggable

            if(YAHOO.util.DD &&

            (YAHOO.widget.LogReader._defaultContainerEl == this._containerEl)) {

                var ylog_dd = new YAHOO.util.DD(this._containerEl.id);

                ylog_dd.setHandleElId(this._hdEl.id);

                this._hdEl.style.cursor = "move";

            }

        }

        // Ceate console

        if(!this._consoleEl) {

            this._consoleEl = this._containerEl.appendChild(document.createElement("div"));

            this._consoleEl.className = "yui-log-bd";

            

            // If implementer has provided console, trust and set those

            if(this.height) {

                this._consoleEl.style.height = this.height;

            }

        }

        // Don't create footer if disabled

        if(!this._ftEl && this.footerEnabled) {

            this._ftEl = this._containerEl.appendChild(document.createElement("div"));

            this._ftEl.className = "yui-log-ft";



            this._btnsEl = this._ftEl.appendChild(document.createElement("div"));

            this._btnsEl.className = "yui-log-btns";



            this._pauseBtn = document.createElement("input");

            this._pauseBtn.type = "button";

            this._pauseBtn.style.fontSize = YAHOO.util.Dom.getStyle(this._containerEl,"fontSize");

            this._pauseBtn.className = "yui-log-button";

            this._pauseBtn.value = "Pause";

            this._pauseBtn = this._btnsEl.appendChild(this._pauseBtn);

            YAHOO.util.Event.addListener(oSelf._pauseBtn,'click',oSelf._onClickPauseBtn,oSelf);



            this._clearBtn = document.createElement("input");

            this._clearBtn.type = "button";

            this._clearBtn.style.fontSize = YAHOO.util.Dom.getStyle(this._containerEl,"fontSize");

            this._clearBtn.className = "yui-log-button";

            this._clearBtn.value = "Clear";

            this._clearBtn = this._btnsEl.appendChild(this._clearBtn);

            YAHOO.util.Event.addListener(oSelf._clearBtn,'click',oSelf._onClickClearBtn,oSelf);



            this._categoryFiltersEl = this._ftEl.appendChild(document.createElement("div"));

            this._categoryFiltersEl.className = "yui-log-categoryfilters";

            this._sourceFiltersEl = this._ftEl.appendChild(document.createElement("div"));

            this._sourceFiltersEl.className = "yui-log-sourcefilters";

        }

    }



    // Initialize buffer

    if(!this._buffer) {

        this._buffer = []; // output buffer

    }

    YAHOO.widget.Logger.newLogEvent.subscribe(this._onNewLog, this);

    this._lastTime = YAHOO.widget.Logger.getStartTime(); // timestamp of last log message to console



    // Initialize category filters

    this._categoryFilters = [];

    var catsLen = YAHOO.widget.Logger.categories.length;

    if(this._categoryFiltersEl) {

        for(var i=0; i < catsLen; i++) {

            this._createCategoryCheckbox(YAHOO.widget.Logger.categories[i]);

        }

    }

    // Initialize source filters

    this._sourceFilters = [];

    var sourcesLen = YAHOO.widget.Logger.sources.length;

    if(this._sourceFiltersEl) {

        for(var j=0; j < sourcesLen; j++) {

            this._createSourceCheckbox(YAHOO.widget.Logger.sources[j]);

        }

    }

    YAHOO.widget.Logger.categoryCreateEvent.subscribe(this._onCategoryCreate, this);

    YAHOO.widget.Logger.sourceCreateEvent.subscribe(this._onSourceCreate, this);



    YAHOO.widget.LogReader._index++;

    this._filterLogs();

};



/***************************************************************************

 * Public members

 ***************************************************************************/

/**

 * Whether or not the log reader is enabled to output log messages. Default:

 * true.

 *

 * @type boolean

 */

YAHOO.widget.LogReader.prototype.logReaderEnabled = true;



/**

 * Public member to access CSS width of the log reader container.

 *

 * @type string

 */

YAHOO.widget.LogReader.prototype.width = null;



/**

 * Public member to access CSS height of the log reader container.

 *

 * @type string

 */

YAHOO.widget.LogReader.prototype.height = null;



/**

 * Public member to access CSS top position of the log reader container.

 *

 * @type string

 */

YAHOO.widget.LogReader.prototype.top = null;



/**

 * Public member to access CSS left position of the log reader container.

 *

 * @type string

 */

YAHOO.widget.LogReader.prototype.left = null;



/**

 * Public member to access CSS right position of the log reader container.

 *

 * @type string

 */

YAHOO.widget.LogReader.prototype.right = null;



/**

 * Public member to access CSS bottom position of the log reader container.

 *

 * @type string

 */

YAHOO.widget.LogReader.prototype.bottom = null;



/**

 * Public member to access CSS font size of the log reader container.

 *

 * @type string

 */

YAHOO.widget.LogReader.prototype.fontSize = null;



/**

 * Whether or not the footer UI is enabled for the log reader. Default: true.

 *

 * @type boolean

 */

YAHOO.widget.LogReader.prototype.footerEnabled = true;



/**

 * Whether or not output is verbose (more readable). Setting to true will make

 * output more compact (less readable). Default: true.

 *

 * @type boolean

 */

YAHOO.widget.LogReader.prototype.verboseOutput = true;



/**

 * Whether or not newest message is printed on top. Default: true.

 *

 * @type boolean

 */

YAHOO.widget.LogReader.prototype.newestOnTop = true;



/***************************************************************************

 * Public methods

 ***************************************************************************/

/**

 * Pauses output of log messages. While paused, log messages are not lost, but

 * get saved to a buffer and then output upon resume of log reader.

 */

YAHOO.widget.LogReader.prototype.pause = function() {

    this._timeout = null;

    this.logReaderEnabled = false;

};



/**

 * Resumes output of log messages, including outputting any log messages that

 * have been saved to buffer while paused.

 */

YAHOO.widget.LogReader.prototype.resume = function() {

    this.logReaderEnabled = true;

    this._printBuffer();

};



/**

 * Hides UI of log reader. Logging functionality is not disrupted.

 */

YAHOO.widget.LogReader.prototype.hide = function() {

    this._containerEl.style.display = "none";

};



/**

 * Shows UI of log reader. Logging functionality is not disrupted.

 */

YAHOO.widget.LogReader.prototype.show = function() {

    this._containerEl.style.display = "block";

};



/**

 * Updates title to given string.

 *

 * @param {string} sTitle String to display in log reader's title bar.

 */

YAHOO.widget.LogReader.prototype.setTitle = function(sTitle) {

    var regEx = />/g;

    sTitle = sTitle.replace(regEx,"&gt;");

    regEx = /</g;

    sTitle = sTitle.replace(regEx,"&lt;");

    this._title.innerHTML = (sTitle);

};

 /***************************************************************************

 * Private members

 ***************************************************************************/

/**

 * Internal class member to index multiple log reader instances.

 *

 * @type number

 * @private

 */

YAHOO.widget.LogReader._index = 0;



/**

 * A class member shared by all log readers if a container needs to be

 * created during instantiation. Will be null if a container element never needs to

 * be created on the fly, such as when the implementer passes in their own element.

 *

 * @type HTMLElement

 * @private

 */

YAHOO.widget.LogReader._defaultContainerEl = null;



/**

 * Buffer of log messages for batch output.

 *

 * @type array

 * @private

 */

YAHOO.widget.LogReader.prototype._buffer = null;



/**

 * Date of last output log message.

 *

 * @type date

 * @private

 */

YAHOO.widget.LogReader.prototype._lastTime = null;



/**

 * Batched output timeout ID.

 *

 * @type number

 * @private

 */

YAHOO.widget.LogReader.prototype._timeout = null;



/**

 * Array of filters for log message categories.

 *

 * @type array

 * @private

 */

YAHOO.widget.LogReader.prototype._categoryFilters = null;



/**

 * Array of filters for log message sources.

 *

 * @type array

 * @private

 */

YAHOO.widget.LogReader.prototype._sourceFilters = null;



/**

 * Log reader container element.

 *

 * @type HTMLElement

 * @private

 */

YAHOO.widget.LogReader.prototype._containerEl = null;



/**

 * Log reader header element.

 *

 * @type HTMLElement

 * @private

 */

YAHOO.widget.LogReader.prototype._hdEl = null;



/**

 * Log reader collapse element.

 *

 * @type HTMLElement

 * @private

 */

YAHOO.widget.LogReader.prototype._collapseEl = null;



/**

 * Log reader collapse button element.

 *

 * @type HTMLElement

 * @private

 */

YAHOO.widget.LogReader.prototype._collapseBtn = null;



/**

 * Log reader title header element.

 *

 * @type HTMLElement

 * @private

 */

YAHOO.widget.LogReader.prototype._title = null;



/**

 * Log reader console element.

 *

 * @type HTMLElement

 * @private

 */

YAHOO.widget.LogReader.prototype._consoleEl = null;



/**

 * Log reader footer element.

 *

 * @type HTMLElement

 * @private

 */

YAHOO.widget.LogReader.prototype._ftEl = null;



/**

 * Log reader buttons container element.

 *

 * @type HTMLElement

 * @private

 */

YAHOO.widget.LogReader.prototype._btnsEl = null;



/**

 * Container element for log reader category filter checkboxes.

 *

 * @type HTMLElement

 * @private

 */

YAHOO.widget.LogReader.prototype._categoryFiltersEl = null;



/**

 * Container element for log reader source filter checkboxes.

 *

 * @type HTMLElement

 * @private

 */

YAHOO.widget.LogReader.prototype._sourceFiltersEl = null;



/**

 * Log reader pause button element.

 *

 * @type HTMLElement

 * @private

 */

YAHOO.widget.LogReader.prototype._pauseBtn = null;



/**

 * lear button element.

 *

 * @type HTMLElement

 * @private

 */

YAHOO.widget.LogReader.prototype._clearBtn = null;

/***************************************************************************

 * Private methods

 ***************************************************************************/

/**

 * Creates the UI for a category filter in the log reader footer element.

 *

 * @param {string} category Category name

 * @private

 */

YAHOO.widget.LogReader.prototype._createCategoryCheckbox = function(category) {

    var oSelf = this;

    

    if(this._ftEl) {

        var parentEl = this._categoryFiltersEl;

        var filters = this._categoryFilters;



        var filterEl = parentEl.appendChild(document.createElement("span"));

        filterEl.className = "yui-log-filtergrp";

            // Append el at the end so IE 5.5 can set "type" attribute

            // and THEN set checked property

            var categoryChk = document.createElement("input");

            categoryChk.id = "yui-log-filter-" + category + YAHOO.widget.LogReader._index;

            categoryChk.className = "yui-log-filter-" + category;

            categoryChk.type = "checkbox";

            categoryChk.category = category;

            categoryChk = filterEl.appendChild(categoryChk);

            categoryChk.checked = true;



            // Add this checked filter to the internal array of filters

            filters.push(category);

            // Subscribe to the click event

            YAHOO.util.Event.addListener(categoryChk,'click',oSelf._onCheckCategory,oSelf);



            // Create and class the text label

            var categoryChkLbl = filterEl.appendChild(document.createElement("label"));

            categoryChkLbl.htmlFor = categoryChk.id;

            categoryChkLbl.className = category;

            categoryChkLbl.innerHTML = category;

    }

};



YAHOO.widget.LogReader.prototype._createSourceCheckbox = function(source) {

    var oSelf = this;



    if(this._ftEl) {

        var parentEl = this._sourceFiltersEl;

        var filters = this._sourceFilters;



        var filterEl = parentEl.appendChild(document.createElement("span"));

        filterEl.className = "yui-log-filtergrp";



        // Append el at the end so IE 5.5 can set "type" attribute

        // and THEN set checked property

        var sourceChk = document.createElement("input");

        sourceChk.id = "yui-log-filter" + source + YAHOO.widget.LogReader._index;

        sourceChk.className = "yui-log-filter" + source;

        sourceChk.type = "checkbox";

        sourceChk.source = source;

        sourceChk = filterEl.appendChild(sourceChk);

        sourceChk.checked = true;



        // Add this checked filter to the internal array of filters

        filters.push(source);

        // Subscribe to the click event

        YAHOO.util.Event.addListener(sourceChk,'click',oSelf._onCheckSource,oSelf);



        // Create and class the text label

        var sourceChkLbl = filterEl.appendChild(document.createElement("label"));

        sourceChkLbl.htmlFor = sourceChk.id;

        sourceChkLbl.className = source;

        sourceChkLbl.innerHTML = source;

    }

};



/**

 * Reprints all log messages in the stack through filters.

 *

 * @private

 */

YAHOO.widget.LogReader.prototype._filterLogs = function() {

    // Reprint stack with new filters

    if (this._consoleEl !== null) {

        this._clearConsole();

        this._printToConsole(YAHOO.widget.Logger.getStack());

    }

};



/**

 * Clears all outputted log messages from the console and resets the time of the

 * last output log message.

 *

 * @private

 */

YAHOO.widget.LogReader.prototype._clearConsole = function() {

    // Clear the buffer of any pending messages

    this._timeout = null;

    this._buffer = [];



    // Reset the rolling timer

    this._lastTime = YAHOO.widget.Logger.getStartTime();



    var consoleEl = this._consoleEl;

    while(consoleEl.hasChildNodes()) {

        consoleEl.removeChild(consoleEl.firstChild);

    }

};



/**

 * Sends buffer of log messages to output and clears buffer.

 *

 * @private

 */

YAHOO.widget.LogReader.prototype._printBuffer = function() {

    this._timeout = null;



    if (this._consoleEl !== null) {

        var entries = [];

        for (var i=0; i<this._buffer.length; i++) {

            entries[i] = this._buffer[i];

        }

        this._buffer = [];

        this._printToConsole(entries);

        if(!this.newestOnTop) {

            this._consoleEl.scrollTop = this._consoleEl.scrollHeight;

        }

    }

};



/**

 * Cycles through an array of log messages, and outputs each one to the console

 * if its category has not been filtered out.

 *

 * @param {array} aEntries

 * @private

 */

YAHOO.widget.LogReader.prototype._printToConsole = function(aEntries) {

    var entriesLen = aEntries.length;

    var sourceFiltersLen = this._sourceFilters.length;

    var categoryFiltersLen = this._categoryFilters.length;

    // Iterate through all log entries to print the ones that filter through

    for(var i=0; i<entriesLen; i++) {

        var entry = aEntries[i];

        var category = entry.category;

        var source = entry.source;

        var sourceDetail = entry.sourceDetail;

        var okToPrint = false;

        var okToFilterCats = false;



        for(var j=0; j<sourceFiltersLen; j++) {

            if(source == this._sourceFilters[j]) {

                okToFilterCats = true;

                break;

            }

        }

        if(okToFilterCats) {

            for(var k=0; k<categoryFiltersLen; k++) {

                if(category == this._categoryFilters[k]) {

                    okToPrint = true;

                    break;

                }

            }

        }

        if(okToPrint) {

            // To format for console, calculate the elapsed time

            // to be from the last item that passed through the filter,

            // not the absolute previous item in the stack

            var label = entry.category.substring(0,4).toUpperCase();



            var time = entry.time;

            if (time.toLocaleTimeString) {

                var localTime  = time.toLocaleTimeString();

            }

            else {

                localTime = time.toString();

            }



            var msecs = time.getTime();

            var startTime = YAHOO.widget.Logger.getStartTime();

            var totalTime = msecs - startTime;

            var elapsedTime = msecs - this._lastTime;

            this._lastTime = msecs;

            

            var verboseOutput = (this.verboseOutput) ? "<br>" : "";

            var sourceAndDetail = (sourceDetail) ?

                source + " " + sourceDetail : source;



            var output =  "<span class='"+category+"'>"+label+"</span> " +

                totalTime + "ms (+" +

                elapsedTime + ") " + localTime + ": " +

                sourceAndDetail + ": " +

                verboseOutput +

                entry.msg;



            var oNewElement = (this.newestOnTop) ?

                this._consoleEl.insertBefore(document.createElement("p"),this._consoleEl.firstChild):

                this._consoleEl.appendChild(document.createElement("p"));

            oNewElement.innerHTML = output;

        }

    }

};



/***************************************************************************

 * Private event handlers

 ***************************************************************************/

/**

 * Handles Logger's categoryCreateEvent.

 *

 * @param {string} type The event

 * @param {array} args Data passed from event firer

 * @param {object} oSelf The log reader instance

 * @private

 */

YAHOO.widget.LogReader.prototype._onCategoryCreate = function(type, args, oSelf) {

    var category = args[0];

    if(oSelf._ftEl) {

        oSelf._createCategoryCheckbox(category);

    }

};



/**

 * Handles Logger's sourceCreateEvent.

 *

 * @param {string} type The event

 * @param {array} args Data passed from event firer

 * @param {object} oSelf The log reader instance

 * @private

 */

YAHOO.widget.LogReader.prototype._onSourceCreate = function(type, args, oSelf) {

    var source = args[0];

    if(oSelf._ftEl) {

        oSelf._createSourceCheckbox(source);

    }

};



/**

 * Handles check events on the category filter checkboxes.

 *

 * @param {event} v The click event

 * @param {object} oSelf The log reader instance

 * @private

 */

YAHOO.widget.LogReader.prototype._onCheckCategory = function(v, oSelf) {

    var newFilter = this.category;

    var filtersArray = oSelf._categoryFilters;



    if(!this.checked) { // Remove category from filters

        for(var i=0; i<filtersArray.length; i++) {

            if(newFilter == filtersArray[i]) {

                filtersArray.splice(i, 1);

                break;

            }

        }

    }

    else { // Add category to filters

        filtersArray.push(newFilter);

    }

    oSelf._filterLogs();

};



/**

 * Handles check events on the category filter checkboxes.

 *

 * @param {event} v The click event

 * @param {object} oSelf The log reader instance

 * @private

 */

YAHOO.widget.LogReader.prototype._onCheckSource = function(v, oSelf) {

    var newFilter = this.source;

    var filtersArray = oSelf._sourceFilters;

    

    if(!this.checked) { // Remove category from filters

        for(var i=0; i<filtersArray.length; i++) {

            if(newFilter == filtersArray[i]) {

                filtersArray.splice(i, 1);

                break;

            }

        }

    }

    else { // Add category to filters

        filtersArray.push(newFilter);

    }

    oSelf._filterLogs();

};



/**

 * Handles click events on the collapse button.

 *

 * @param {event} v The click event

 * @param {object} oSelf The log reader instance

 * @private

 */

YAHOO.widget.LogReader.prototype._onClickCollapseBtn = function(v, oSelf) {

    var btn = oSelf._collapseBtn;

    if(btn.value == "Expand") {

        oSelf._consoleEl.style.display = "block";

        if(oSelf._ftEl) {

            oSelf._ftEl.style.display = "block";

        }

        btn.value = "Collapse";

    }

    else {

        oSelf._consoleEl.style.display = "none";

        if(oSelf._ftEl) {

            oSelf._ftEl.style.display = "none";

        }

        btn.value = "Expand";

    }

};



/**

 * Handles click events on the pause button.

 *

 * @param {event} v The click event

 * @param {object} oSelf The log reader instance

 * @private

 */

YAHOO.widget.LogReader.prototype._onClickPauseBtn = function(v, oSelf) {

    var btn = oSelf._pauseBtn;

    if(btn.value == "Resume") {

        oSelf.resume();

        btn.value = "Pause";

    }

    else {

        oSelf.pause();

        btn.value = "Resume";

    }

};



/**

 * Handles click events on the clear button.

 *

 * @param {event} v The click event

 * @param {object} oSelf The log reader instance

 * @private

 */

YAHOO.widget.LogReader.prototype._onClickClearBtn = function(v, oSelf) {

    oSelf._clearConsole();

};



/**

 * Handles Logger's onNewEvent.

 *

 * @param {string} type The click event

 * @param {array} args Data passed from event firer

 * @param {object} oSelf The log reader instance

 * @private

 */

YAHOO.widget.LogReader.prototype._onNewLog = function(type, args, oSelf) {

    var logEntry = args[0];

    oSelf._buffer.push(logEntry);



    if (oSelf.logReaderEnabled === true && oSelf._timeout === null) {

        oSelf._timeout = setTimeout(function(){oSelf._printBuffer();}, 100);

    }

};