/**
    Project: CheckTree jQuery Plugin
    Version: 0.2
    Project Website: http://static.geewax.org/checktree/
    Author: JJ Geewax <jj@geewax.org>
    
    License:
        The CheckTree jQuery plugin is currently available for use in all personal or 
        commercial projects under both MIT and GPL licenses. This means that you can choose 
        the license that best suits your project, and use it accordingly.
*/
(function(jQuery) {
jQuery.fn.checkTree = function(settings) {

    settings = jQuery.extend({
        /* Callbacks
            The callbacks should be functions that take one argument. The checkbox tree
            will return the jQuery wrapped LI element of the item that was expanded.
        */
        onExpand: null,
        onCollapse: null,
        onLabelHoverOver: null,
        onLabelHoverOut: null,
        
        /* Valid choices: 'expand' */
        labelAction: "expand",
        
        // Debug (currently does nothing)
        debug: false
    }, settings);

    var $tree = this;

    $tree.find("li")
        // Hide all of the sub-trees
        .find("ul")
            .hide()
        .end()
        
        
        .find("label")
            // Clicking the labels should expand the children
            .click(function() {
                var action = settings.labelAction;
                switch(settings.labelAction) {
                    case 'expand':
                        jQuery(this).siblings(".arrow").click();
                        break;
                }
            })
            
            // Add a hover class to the labels when hovering
            .hover(
                function() { 
                    jQuery(this).addClass("hover");
                    if (settings.onLabelHoverOver) settings.onLabelHoverOver(jQuery(this).parent());
                },
                function() {
                    jQuery(this).removeClass("hover");
                    if (settings.onLabelHoverOut) settings.onLabelHoverOut(jQuery(this).parent());
                }
            )
        .end()
        
        .each(function() {
            // Create the image for the arrow (to expand and collapse the hidden trees)
            var $arrow = jQuery('<div class="arrow"></div>');
            
            // If it has children:
            if (jQuery(this).is(":has(ul)")) {
                $arrow.addClass("collapsed"); // Should start collapsed
                
                // When you click the image, toggle the child list
                $arrow.click(function() {
                    jQuery(this).siblings("ul").toggle();
                    
                    if (jQuery(this).hasClass("collapsed")) {
                        //toggled = settings.expandedarrow;
                        jQuery(this)
                            .addClass("expanded")
                            .removeClass("collapsed")
                        ;
                        if (settings.onExpand) settings.onExpand(jQuery(this).parent());
                    }
                    else {
                        //toggled = settings.collapsedarrow;
                        jQuery(this)
                            .addClass("collapsed")
                            .removeClass("expanded")
                        ;
                        if (settings.onCollapse) settings.onCollapse(jQuery(this).parent());
                    }
                });
            }
            
            // Prepend the arrow and checkbox images to the front of the LI
            jQuery(this)
                .prepend($arrow)
            ;
        })
    ;

    return $tree;
};
})(jQuery);