// vim: et:ts=4:sw=4:sts=4:ft=javascript
/*@
Ox.ButtonGroup <f:Ox.Element> ButtonGroup Object
    () ->              <f> ButtonGroup Object
    (options) ->       <f> ButtonGroup Object
    (options, self) -> <f> ButtonGroup Object
    options <o> Options object
        buttons     <a> array of buttons
        max         <n> integer, maximum number of selected buttons, 0 for all
        min         <n> integer, minimum number of selected buttons, 0 for none
        selectable  <b> if true, buttons are selectable
        type        <s> string, 'image' or 'text'
    self <o>    Shared private variable
    change <!>    {id, value}     selection within a group changed
@*/

Ox.ButtonGroup = function(options, self) {

    self = self || {};
    var that = Ox.Element({}, self)
            .defaults({
                buttons: [],
                max: 1,
                min: 1,
                selectable: false,
                size: 'medium',
                style: '',
                type: 'text',
            })
            .options(options || {})
            .addClass('OxButtonGroup');

    if (self.options.selectable) {
        self.optionGroup = new Ox.OptionGroup(
            self.options.buttons,
            self.options.min,
            self.options.max,
            'selected'
        );
        self.options.buttons = self.optionGroup.init();
    }

    self.$buttons = [];
    self.options.buttons.forEach(function(button, position) {
        var id = self.options.id + Ox.toTitleCase(button.id)
        self.$buttons[position] = Ox.Button({
                disabled: button.disabled,
                group: true,
                id: id,
                selectable: self.options.selectable,
                selected: button.selected,
                size: self.options.size,
                style: self.options.style,
                title: button.title,
                type: self.options.type
            })
            .bindEvent('select', function() {
                selectButton(position);
            })
            .appendTo(that);
    });

    function selectButton(pos) {
        var toggled = self.optionGroup.toggle(pos);
        if (toggled.length) {
            toggled.forEach(function(pos, i) {
                self.$buttons[pos].toggleSelected();
            });
            that.triggerEvent('change', {
                selected: self.optionGroup.selected().map(function(i) {
                    return self.options.buttons[v].id;
                })
            });
        }
    }

    return that;
};