/*
(c) Copyrights 2007 - 2008

Original idea by by Binny V A, http://www.openjs.com/scripts/events/keyboard_shortcuts/
 
jQuery Plugin by Tzury Bar Yochay 
tzury.by@gmail.com
http://evalinux.wordpress.com
http://facebook.com/profile.php?id=513676303

Project's sites: 
http://code.google.com/p/js-hotkeys/
http://github.com/tzuryby/hotkeys/tree/master

License: same as jQuery license. 

USAGE:
// simple usage
$(document).bind('keydown', 'Ctrl+c', function(){ alert('copy anyone?');});
    
// special options such as disableInIput
$(document).bind('keydown', {combi:'Ctrl+x', disableInInput: true} , function() {});
    
Note:
This plugin wraps the following jQuery methods: $.fn.find, $.fn.bind and $.fn.unbind
    
*/


(function(jQuery) {
    // keep reference to the original $.fn.bind and $.fn.unbind
    jQuery.fn.__bind__ = jQuery.fn.bind;
    jQuery.fn.__unbind__ = jQuery.fn.unbind;
    jQuery.fn.__find__ = jQuery.fn.find;

    var hotkeys = {
        version: '0.7.8',
        override: /keydown|keypress|keyup/g,
        triggersMap: {},

        specialKeys: { 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'
        },

        shiftNums: { "`": "~", "1": "!", "2": "@", "3": "#", "4": "$", "5": "%", "6": "^", "7": "&",
            "8": "*", "9": "(", "0": ")", "-": "_", "=": "+", ";": ":", "'": "\"", ",": "<",
            ".": ">", "/": "?", "\\": "|"
        },

        newTrigger: function(type, combi, callback) {
            // i.e. {'keyup': {'ctrl': {cb: callback, disableInInput: false}}}
            var result = {};
            result[type] = {};
            result[type][combi] = { cb: callback, disableInInput: false };
            return result;
        }
    };
    // add firefox num pad char codes
    if (jQuery.browser.mozilla) {
        hotkeys.specialKeys = jQuery.extend(hotkeys.specialKeys, { 96: '0', 97: '1', 98: '2', 99:
            '3', 100: '4', 101: '5', 102: '6', 103: '7', 104: '8', 105: '9'
        });
    }

    // a wrapper around of $.fn.find 
    // see more at: http://groups.google.com/group/jquery-en/browse_thread/thread/18f9825e8d22f18d
    jQuery.fn.find = function(selector) {
        this.query = selector;
        return jQuery.fn.__find__.apply(this, arguments);
    };

    jQuery.fn.unbind = function(type, combi, fn) {
        if (jQuery.isFunction(combi)) {
            fn = combi;
            combi = null;
        }
        if (combi && typeof combi === 'string') {
            var selectorId = ((this.prevObject && this.prevObject.query) || (this[0].id && this[0].id) || this[0]).toString();
            var hkTypes = type.split(' ');
            for (var x = 0; x < hkTypes.length; x++) {
                delete hotkeys.triggersMap[selectorId][hkTypes[x]][combi];
            }
        }
        // call jQuery original unbind
        return this.__unbind__(type, fn);
    };

    jQuery.fn.bind = function(type, data, fn) {
        // grab keyup,keydown,keypress
        var handle = type.match(hotkeys.override);

        if (jQuery.isFunction(data) || !handle) {
            // call jQuery.bind only
            return this.__bind__(type, data, fn);
        }
        else {
            // split the job
            var result = null,
            // pass the rest to the original $.fn.bind
            pass2jq = jQuery.trim(type.replace(hotkeys.override, ''));

            // see if there are other types, pass them to the original $.fn.bind
            if (pass2jq) {
                // call original jQuery.bind()
                result = this.__bind__(pass2jq, data, fn);
            }

            if (typeof data === "string") {
                data = { 'combi': data };
            }
            if (data.combi) {
                for (var x = 0; x < handle.length; x++) {
                    var eventType = handle[x];
                    var combi = data.combi.toLowerCase(),
                        trigger = hotkeys.newTrigger(eventType, combi, fn),
                        selectorId = ((this.prevObject && this.prevObject.query) || (this[0].id && this[0].id) || this[0]).toString();

                    //trigger[eventType][combi].propagate = data.propagate;
                    trigger[eventType][combi].disableInInput = data.disableInInput;

                    // first time selector is bounded
                    if (!hotkeys.triggersMap[selectorId]) {
                        hotkeys.triggersMap[selectorId] = trigger;
                    }
                    // first time selector is bounded with this type
                    else if (!hotkeys.triggersMap[selectorId][eventType]) {
                        hotkeys.triggersMap[selectorId][eventType] = trigger[eventType];
                    }
                    // make trigger point as array so more than one handler can be bound
                    var mapPoint = hotkeys.triggersMap[selectorId][eventType][combi];
                    if (!mapPoint) {
                        hotkeys.triggersMap[selectorId][eventType][combi] = [trigger[eventType][combi]];
                    }
                    else if (mapPoint.constructor !== Array) {
                        hotkeys.triggersMap[selectorId][eventType][combi] = [mapPoint];
                    }
                    else {
                        hotkeys.triggersMap[selectorId][eventType][combi][mapPoint.length] = trigger[eventType][combi];
                    }

                    // add attribute and call $.event.add per matched element
                    this.each(function() {
                        // jQuery wrapper for the current element
                        var jqElem = jQuery(this);

                        // element already associated with another collection
                        if (jqElem.attr('hkId') && jqElem.attr('hkId') !== selectorId) {
                            selectorId = jqElem.attr('hkId') + ";" + selectorId;
                        }
                        jqElem.attr('hkId', selectorId);
                    });
                    result = this.__bind__(handle.join(' '), data, hotkeys.handler)
                }
            }
            return result;
        }
    };
    // work-around for opera and safari where (sometimes) the target is the element which was last 
    // clicked with the mouse and not the document event it would make sense to get the document
    hotkeys.findElement = function(elem) {
        if (!jQuery(elem).attr('hkId')) {
            if (jQuery.browser.opera || jQuery.browser.safari) {
                while (!jQuery(elem).attr('hkId') && elem.parentNode) {
                    elem = elem.parentNode;
                }
            }
        }
        return elem;
    };
    // the event handler
    hotkeys.handler = function(event) {
        var target = hotkeys.findElement(event.currentTarget),
            jTarget = jQuery(target),
            ids = jTarget.attr('hkId');

        if (ids) {
            ids = ids.split(';');
            var code = event.which,
                type = event.type,
                special = hotkeys.specialKeys[code],
            // prevent f5 overlapping with 't' (or f4 with 's', etc.)
                character = !special && String.fromCharCode(code).toLowerCase(),
                shift = event.shiftKey,
                ctrl = event.ctrlKey,
            // patch for jquery 1.2.5 && 1.2.6 see more at:  
            // http://groups.google.com/group/jquery-en/browse_thread/thread/83e10b3bb1f1c32b
                alt = event.altKey || event.originalEvent.altKey,
                mapPoint = null;

            for (var x = 0; x < ids.length; x++) {
                if (hotkeys.triggersMap[ids[x]][type]) {
                    mapPoint = hotkeys.triggersMap[ids[x]][type];
                    break;
                }
            }

            //find by: id.type.combi.options            
            if (mapPoint) {
                var trigger;
                // event type is associated with the hkId
                if (!shift && !ctrl && !alt) { // No Modifiers
                    trigger = mapPoint[special] || (character && mapPoint[character]);
                }
                else {
                    // check combinations (alt|ctrl|shift+anything)
                    var modif = '';
                    if (alt) modif += 'alt+';
                    if (ctrl) modif += 'ctrl+';
                    if (shift) modif += 'shift+';

                    // modifiers + special keys or modifiers + character or modifiers + shift character or just shift character
                    trigger = mapPoint[modif + special];
                    if (!trigger) {
                        if (character) {
                            trigger = mapPoint[modif + character]
                                || mapPoint[modif + hotkeys.shiftNums[character]]
                            // '$' can be triggered as 'Shift+4' or 'Shift+$' or just '$'
                                || (modif === 'shift+' && mapPoint[hotkeys.shiftNums[character]]);
                        }
                    }
                }
                if (trigger) {
                    var result = false;
                    for (var x = 0; x < trigger.length; x++) {
                        if (trigger[x].disableInInput) {
                            // double check event.currentTarget and event.target
                            var elem = jQuery(event.target);
                            if (jTarget.is("input") || jTarget.is("textarea")
                                || elem.is("input") || elem.is("textarea")) {
                                return true;
                            }
                        }
                        // call the registered callback function
                        result = result || trigger[x].cb.apply(this, [event]);
                    }
                    return result;
                }
            }
        }
    };
    // place it under window so it can be extended and overridden by others
    window.hotkeys = hotkeys;
    return jQuery;
})(jQuery);