// vim: et:ts=4:sw=4:sts=4:ft=javascript
/*@
Ox.Focus <o> Basic focus handler
@*/

Ox.Focus = (function() {
    var stack = [];
    return {
        _print: function() {
            Ox.print(stack);
        },
        _reset: function() {
            $('.OxFocus').removeClass('OxFocus');
            stack = [];
        },
        /*@
        blur <f> blur element
            (id) -> <u> blur element by id
        @*/
        blur: function(id) {
            var index = stack.indexOf(id);
            if (index > -1 && index == stack.length - 1) {
                stack.length == 1 ? stack.pop() :
                        stack.splice(stack.length - 2, 0, stack.pop());
                //$elements[id].removeClass('OxFocus');
                $('.OxFocus').removeClass('OxFocus'); // fixme: the above is better, and should work
                stack.length && Ox.UI.elements[stack[stack.length - 1]].addClass('OxFocus');
                Ox.print('blur', id, stack);
            }
        },
        /*@
        focus <f> focus element
            (id) -> <u> focus element by id
        @*/
        focus: function(id) {
            var index = stack.indexOf(id);
            if (index == -1 || index < stack.length - 1) {
                index > -1 && stack.splice(index, 1);
                stack.push(id);
                $('.OxFocus').removeClass('OxFocus'); // fixme: see above
                Ox.print('focus', id, stack);
                Ox.UI.elements[id].addClass('OxFocus');
            }
        },
        /*@
        focused <f> return id of focused element, or null
            () -> <s> get id of currently focused element
        @*/
        focused: function() {
            return stack.length ? stack[stack.length - 1] : null;
        }
    };
}());