/**
 * Created by RalpAlves on 30/10/2015.
 */
shortcut = {
    'all_shortcuts': {}, 'add': function (shortcut_combination, callback, opt) {
        var default_options = {'type': 'keydown', 'propagate': false, 'disable_in_input': false, 'target': document, 'keycode': false}
        if (!opt)opt = default_options; else {
            for (var dfo in default_options) {
                if (typeof opt[dfo] == 'undefined')opt[dfo] = default_options[dfo];
            }
        }
        var ele = opt.target;
        if (typeof opt.target == 'string')ele = document.getElementById(opt.target);
        var ths = this;
        shortcut_combination = shortcut_combination.toLowerCase();
        var func = function (e) {
            e = e || window.event;
            if (opt['disable_in_input']) {
                var element;
                if (e.target)element = e.target; else if (e.srcElement)element = e.srcElement;
                if (element.nodeType == 3)element = element.parentNode;
                if (element.tagName == 'INPUT' || element.tagName == 'TEXTAREA')return;
            }
            if (e.keyCode)code = e.keyCode; else if (e.which)code = e.which;
            var character = String.fromCharCode(code).toLowerCase();
            if (code == 188)character = ",";
            if (code == 190)character = ".";
            var keys = shortcut_combination.split("+");
            var kp = 0;
            var shift_nums = {
                "`": "~",
                "1": "!",
                "2": "@",
                "3": "#",
                "4": "$",
                "5": "%",
                "6": "^",
                "7": "&",
                "8": "*",
                "9": "(",
                "0": ")",
                "-": "_",
                "=": "+",
                ";": ":",
                "'": "\"",
                ",": "<",
                ".": ">",
                "/": "?",
                "\\": "|"
            }
            var special_keys = {
                'esc': 27,
                'escape': 27,
                'tab': 9,
                'space': 32,
                'return': 13,
                'enter': 13,
                'backspace': 8,
                'scrolllock': 145,
                'scroll_lock': 145,
                'scroll': 145,
                'capslock': 20,
                'caps_lock': 20,
                'caps': 20,
                'numlock': 144,
                'num_lock': 144,
                'num': 144,
                'pause': 19,
                'break': 19,
                'insert': 45,
                'home': 36,
                'delete': 46,
                'end': 35,
                'pageup': 33,
                'page_up': 33,
                'pu': 33,
                'pagedown': 34,
                'page_down': 34,
                'pd': 34,
                'left': 37,
                'up': 38,
                'right': 39,
                'down': 40,
                'f1': 112,
                'f2': 113,
                'f3': 114,
                'f4': 115,
                'f5': 116,
                'f6': 117,
                'f7': 118,
                'f8': 119,
                'f9': 120,
                'f10': 121,
                'f11': 122,
                'f12': 123
            }
            var modifiers = {
                shift: {wanted: false, pressed: false},
                ctrl: {wanted: false, pressed: false},
                alt: {wanted: false, pressed: false},
                meta: {wanted: false, pressed: false}
            };
            if (e.ctrlKey)modifiers.ctrl.pressed = true;
            if (e.shiftKey)modifiers.shift.pressed = true;
            if (e.altKey)modifiers.alt.pressed = true;
            if (e.metaKey)modifiers.meta.pressed = true;
            for (var i = 0; k = keys[i], i < keys.length; i++) {
                if (k == 'ctrl' || k == 'control') {
                    kp++;
                    modifiers.ctrl.wanted = true;
                } else if (k == 'shift') {
                    kp++;
                    modifiers.shift.wanted = true;
                } else if (k == 'alt') {
                    kp++;
                    modifiers.alt.wanted = true;
                } else if (k == 'meta') {
                    kp++;
                    modifiers.meta.wanted = true;
                } else if (k.length > 1) {
                    if (special_keys[k] == code)kp++;
                } else if (opt['keycode']) {
                    if (opt['keycode'] == code)kp++;
                } else {
                    if (character == k)kp++; else {
                        if (shift_nums[character] && e.shiftKey) {
                            character = shift_nums[character];
                            if (character == k)kp++;
                        }
                    }
                }
            }
            if (kp == keys.length && modifiers.ctrl.pressed == modifiers.ctrl.wanted && modifiers.shift.pressed == modifiers.shift.wanted && modifiers.alt.pressed == modifiers.alt.wanted && modifiers.meta.pressed == modifiers.meta.wanted) {
                callback(e);
                if (!opt['propagate']) {
                    e.cancelBubble = true;
                    e.returnValue = false;
                    if (e.stopPropagation) {
                        e.stopPropagation();
                        e.preventDefault();
                    }
                    return false;
                }
            }
        }
        this.all_shortcuts[shortcut_combination] = {'callback': func, 'target': ele, 'event': opt['type']};
        if (ele.addEventListener)ele.addEventListener(opt['type'], func, false); else if (ele.attachEvent)ele.attachEvent('on' + opt['type'], func); else ele['on' + opt['type']] = func;
    }, 'remove': function (shortcut_combination) {
        shortcut_combination = shortcut_combination.toLowerCase();
        var binding = this.all_shortcuts[shortcut_combination];
        delete(this.all_shortcuts[shortcut_combination])
        if (!binding)return;
        var type = binding['event'];
        var ele = binding['target'];
        var callback = binding['callback'];
        if (ele.detachEvent)ele.detachEvent('on' + type, callback); else if (ele.removeEventListener)ele.removeEventListener(type, callback, false); else ele['on' + type] = false;
    }
}