// vim: et:ts=4:sw=4:sts=4:ft=javascript
'use strict';
/*@
Ox.Checkbox <f:Ox.Element> Checkbox Element
    () ->              <f> Checkbox Element
    (options) ->       <f> Checkbox Element
    (options, self) -> <f> Checkbox Element
    options <o> Options object
        disabled <b> if true, checkbox is disabled
        group <b> if true, checkbox is part of a group
        id <s> element id
        label <s> Label (on the left side)
        labelWidth <n|64> Label width
        title <s> Title (on the right side)
        value <b> if true, checkbox is checked
        width <n> width in px
    self <o>    Shared private variable
    change <!> triggered when value changes
@*/

Ox.Checkbox = function(options, self) {

    self = self || {};
    var that = Ox.Element({}, self)
            .defaults({
                disabled: false,
                group: false,
                id: '',
                label: '',
                labelWidth: 64,
                overlap: 'none',
                title: '',
                value: false,
                width: 'auto'
            })
            .options(options || {})
            .addClass('OxCheckbox' + (
                self.options.overlap == 'none'
                ? '' : ' OxOverlap' + Ox.toTitleCase(self.options.overlap)
            ))
            .attr({
                disabled: self.options.disabled
            });

    if (self.options.title) {
        self.options.width != 'auto' && that.css({
            width: self.options.width + 'px'
        });
        self.$title = Ox.Label({
                disabled: self.options.disabled,
                id: self.options.id + 'Label',
                overlap: 'left',
                title: self.options.title,
                width: getTitleWidth()
            })
            .css({float: 'right'})
            .click(clickTitle)
            .appendTo(that);
    }

    if (self.options.label) {
        self.$label = Ox.Label({
                overlap: 'right',
                textAlign: 'right',
                title: self.options.label,
                width: self.options.labelWidth
            })
            .css({float: 'left'})
            .appendTo(that);
    }

    self.$button = Ox.Button({
            disabled: self.options.disabled,
            id: self.options.id + 'Button',
            title: ['none', 'check'],
            type: 'image',
            value: self.options.value ? 'check' : 'none'
        })
        .addClass('OxCheckbox')
        .bindEvent({
            change: clickButton
        })
        .appendTo(that);

    function clickButton() {
        self.options.value = !self.options.value;
        that.triggerEvent('change', {
            value: self.options.value
        });
    }

    function clickTitle() {
        !self.options.disabled && self.$button.trigger('click');
    }

    function getTitleWidth() {
        return self.options.width - 16
            - !!self.options.label * self.options.labelWidth;
    }

    self.setOption = function(key, value) {
        if (key == 'disabled') {
            that.attr({disabled: value});
            self.$button.options({disabled: value});
            self.$title && self.$title.options({disabled: value});
        } else if (key == 'title') {
            self.$title.options({title: value});
        } else if (key == 'value') {
            self.$button.toggleTitle();
        } else if (key == 'width') {
            that.css({width: value + 'px'});
            self.$title && self.$title.options({width: getTitleWidth()});
        }
    };

    // fixme: added for forms, duplicated, checked() shouldn't be neccessary
    that.value = function() {
        return self.options.checked;
    }

    return that;

};