/***
    Ox.Keyboard
***/

(function() {

    var buffer = '',
        bufferTime = 0,
        bufferTimeout = 1000,
        // wrapped in function so it can be collapsed in text editor
        keyNames = (function() {
            return {
                0: 'section',
                8: 'backspace',
                9: 'tab',
                12: 'clear',
                13: 'enter',
                16: 'shift',
                17: 'control',
                18: 'alt',
                20: 'capslock',
                27: 'escape',
                32: 'space',
                33: 'pageup',
                34: 'pagedown',
                35: 'end',
                36: 'home',
                37: 'left',
                38: 'up',
                39: 'right',
                40: 'down',
                45: 'insert',
                46: 'delete',
                47: 'help',
                48: '0',
                49: '1',
                50: '2',
                51: '3',
                52: '4',
                53: '5',
                54: '6',
                55: '7',
                56: '8',
                57: '9',
                65: 'a',
                66: 'b',
                67: 'c',
                68: 'd',
                69: 'e',
                70: 'f',
                71: 'g',
                72: 'h',
                73: 'i',
                74: 'j',
                75: 'k',
                76: 'l',
                77: 'm',
                78: 'n',
                79: 'o',
                80: 'p',
                81: 'q',
                82: 'r',
                83: 's',
                84: 't',
                85: 'u',
                86: 'v',
                87: 'w',
                88: 'x',
                89: 'y',
                90: 'z',
                //91: 'meta.left',
                //92: 'meta.right',
                91: 'meta',
                //92: 'meta',
                93: 'meta',
                96: '0.numpad',
                97: '1.numpad',
                98: '2.numpad',
                99: '3.numpad',
                100: '4.numpad',
                101: '5.numpad',
                102: '6.numpad',
                103: '7.numpad',
                104: '8.numpad',
                105: '9.numpad',
                106: 'asterisk.numpad',
                107: 'plus.numpad',
                109: 'minus.numpad',
                108: 'enter.numpad',
                110: 'dot.numpad',
                111: 'slash.numpad',
                112: 'f1',
                113: 'f2',
                114: 'f3',
                115: 'f4',
                116: 'f5',
                117: 'f6',
                118: 'f7',
                119: 'f8',
                120: 'f9',
                121: 'f10',
                122: 'f11',
                123: 'f12',
                124: 'f13',
                125: 'f14',
                126: 'f15',
                127: 'f16',
                144: 'numlock',
                145: 'scrolllock',
                186: 'semicolon',
                187: 'equal',
                188: 'comma',
                189: 'minus',
                190: 'dot',
                191: 'slash',
                192: 'backtick',
                219: 'openbracket',
                220: 'backslash',
                221: 'closebracket',
                222: 'quote'
                // see dojo, for ex.
            };
        })(),
        modifierNames = {
            altKey: 'alt', // mac: option
            ctrlKey: 'control',
            // metaKey: 'meta', // mac: command
            shiftKey: 'shift'
        };

    Ox.UI.ready(function() {
        // fixme: how to do this better?
        // in firefox on mac, keypress doesn't fire for up/down
        // if the cursor is at the start/end of an input element
        // on linux, it doesn't seem to fire if the input element has focus
        if ($.browser.mozilla) {
            Ox.UI.$document.keypress(keypress);
            Ox.UI.$document.keydown(function(event) {
                var $element = $('input:focus');
                if ($element.length) {
                    if (
                        (
                            keyNames[event.keyCode] == 'up' &&
                            $element[0].selectionStart + $element[0].selectionEnd == 0
                        ) || (
                            keyNames[event.keyCode] == 'down' &&
                            $element[0].selectionStart == $element.val().length &&
                            $element[0].selectionEnd == $element.val().length
                        )
                    ) {
                        keypress(event);
                    }
                }
            });
        } else {
            Ox.UI.$document.keydown(keypress);
        }
    });

    function keypress(event) {
        var focused = Ox.Focus.focused(),
            key,
            keys = [],
            //ret = true,
            time;
        Ox.forEach(modifierNames, function(v, k) {
            event[k] && keys.push(v);
        });
        // avoid pushing modifier twice
        if (keyNames[event.keyCode] && keys.indexOf(keyNames[event.keyCode]) == -1) {
            keys.push(keyNames[event.keyCode]);
        }
        key = keys.join('_');
        if (key.match(/^[\w\d\-]$|SPACE/)) {
            time = Ox.getTime();
            if (time - bufferTime > bufferTimeout) {
                buffer = '';
            }
            buffer += key == 'SPACE' ? ' ' : key;
            bufferTime = time;
        }
        focused !== null && Ox.UI.elements[focused].triggerEvent('key_' + key);
        if (['down', 'space', 'up'].indexOf(key) > -1 && !Ox.UI.elements[focused].hasClass('OxInput')) {
            // prevent chrome from scrolling
            return false;
        }
        /*
        stack.forEach(function(v) {
            // fixme: we dont get the return value!
            ret = Ox.event.trigger(keyboard + Ox.toCamelCase(key) + '.' + v);
            return ret;
        });
        */
    }

})();