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

 * @ Original idea by by Binny V A, Original version: 2.00.A 

 * @ http://www.openjs.com/scripts/events/keyboard_shortcuts/

 * @ Original License : BSD

 * @ jQuery Plugin by Tzury Bar Yochay 

        mail: tzury.by@gmail.com

        blog: evalinux.wordpress.com

        face: facebook.com/profile.php?id=513676303

        (c) Copyrights 2007

 * @ jQuery Plugin version Beta (0.0.2)

 * @ License: jQuery-License.

TODO:

    add queue support (as in gmail) e.g. 'x' then 'y', etc.

    add mouse + mouse wheel events.

USAGE:

    $.hotkeys.add('Ctrl+c', function(){ alert('copy anyone?');});

    $.hotkeys.add('Ctrl+c', {target:'div#editor', type:'keyup', propagate: true},function(){ alert('copy anyone?');});>

    $.hotkeys.remove('Ctrl+c'); 

    $.hotkeys.remove('Ctrl+c', {target:'div#editor', type:'keypress'}); 

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

(function (jQuery){

    this.version = '(beta)(0.0.3)';

	this.all = {};

    this.special_keys = {

        27: 'esc', 9: 'tab', 32:'space', 13: 'return', 8:'backspace', 145: 'scroll', 20: 'capslock', 

        144: 'numlock', 19:'pause', 45:'insert', 36:'home', 46:'del',35:'end', 33: 'pageup', 

        34:'pagedown', 37:'left', 38:'up', 39:'right',40:'down', 112:'f1',113:'f2', 114:'f3', 

        115:'f4', 116:'f5', 117:'f6', 118:'f7', 119:'f8', 120:'f9', 121:'f10', 122:'f11', 123:'f12'};

    this.shift_nums = { "`":"~", "1":"!", "2":"@", "3":"#", "4":"$", "5":"%", "6":"^", "7":"&", 

        "8":"*", "9":"(", "0":")", "-":"_", "=":"+", ";":":", "'":"\"", ",":"<", 

        ".":">",  "/":"?",  "\\":"|" };

    this.add = function(combi, options, callback) {

        if (jQuery.isFunction(options)){

            callback = options;

            options = {};

        }

        var opt = {},

            defaults = {type: 'keydown', propagate: false, disableInInput: false, target: jQuery('html')[0]},

            that = this;

        opt = jQuery.extend( opt , defaults, options || {} );

        combi = combi.toLowerCase();        

        // inspect if keystroke matches

        var inspector = function(event) {

            event = jQuery.event.fix(event); // jQuery event normalization.

            var element = event.target;

            // @ TextNode -> nodeType == 3

            element = (element.nodeType==3) ? element.parentNode : element;

            if(opt['disableInInput']) { // Disable shortcut keys in Input, Textarea fields

                var target = jQuery(element);

                if( target.is("input") || target.is("textarea")){

                    return;

                }

            }

            var code = event.which,

                type = event.type,

                character = String.fromCharCode(code).toLowerCase(),

                special = that.special_keys[code],

                shift = event.shiftKey,

                ctrl = event.ctrlKey,

                alt= event.altKey,

                meta = event.metaKey,

                propagate = true, // default behaivour

                mapPoint = null;

            // in opera + safari, the event.target is unpredictable.

            // for example: 'keydown' might be associated with HtmlBodyElement 

            // or the element where you last clicked with your mouse.

            if (jQuery.browser.opera || jQuery.browser.safari){

                while (!that.all[element] && element.parentNode){

                    element = element.parentNode;

                }

            }

            var cbMap = that.all[element].events[type].callbackMap;

            if(!shift && !ctrl && !alt && !meta) { // No Modifiers

                mapPoint = cbMap[special] ||  cbMap[character]

			}

            // deals with combinaitons (alt|ctrl|shift+anything)

            else{

                var modif = '';

                if(alt) modif +='alt+';

                if(ctrl) modif+= 'ctrl+';

                if(shift) modif += 'shift+';

                if(meta) modif += 'meta+';

                // modifiers + special keys or modifiers + characters or modifiers + shift characters

                mapPoint = cbMap[modif+special] || cbMap[modif+character] || cbMap[modif+that.shift_nums[character]]

            }

            if (mapPoint){

                mapPoint.cb(event);

                if(!mapPoint.propagate) {

                    event.stopPropagation();

                    event.preventDefault();

                    return false;

                }

            }

		};        

        // first hook for this element

        if (!this.all[opt.target]){

            this.all[opt.target] = {events:{}};

        }

        if (!this.all[opt.target].events[opt.type]){

            this.all[opt.target].events[opt.type] = {callbackMap: {}}

            jQuery.event.add(opt.target, opt.type, inspector);

        }        

        this.all[opt.target].events[opt.type].callbackMap[combi] =  {cb: callback, propagate:opt.propagate};                

        return jQuery;

	};    

    this.remove = function(exp, opt) {

        opt = opt || {};

        target = opt.target || jQuery('html')[0];

        type = opt.type || 'keydown';

		exp = exp.toLowerCase();        

        delete this.all[target].events[type].callbackMap[exp]        

        return jQuery;

	};

    jQuery.hotkeys = this;

    return jQuery;