/*  Starry Widget
 *  @version 1.1 (April 27, 2007)
 *  (c) 2007 Chris Iufer <chris@duarte.com>
 *  Starry is freely distributable under the terms of an MIT-style license.
 *  See the Duarte Design web site: http://www.duarte.com/portfolio/
/*--------------------------------------------------------------------------*/

var debug = false;

var StarryDefaults = {
        sprite: "/js/starry/stars.gif",
        width: 30,
        height: 30,
        startAt: 0,
        maxLength: 5,
        multiplier: 1,
        showNull: true,
        align: 'left',
        feedback: false
};

// The Starry Class
// new Starry('id_of_element'[, {options}]);
// This is the main starry widget. Create new widgets after window load
var Starry = Class.create();
Starry.prototype = {
    initialize: function(element) {
        this.element = $(element);
        this.element.className = "starry";              
        this.options = {};
        // get our defaults
        Object.extend(this.options, StarryDefaults);
        Object.extend(this.options, arguments[1] || {});        
        this.name = this.options.name || "starry" + id.next();
        this.element.style.height = this.options.height + 'px';     
        if(debug) console.log(this.options.showNull);
        // lets build our array with an extra one for null
        this.children = new Array(this.options.maxLength + 1);
        if(debug) console.log('children length '+ this.children.length);        
        // lets make the hidden form value
        this.hidden = document.createElement("input");
        this.hidden.type = "hidden";
        this.hidden.name = this.name;
        this.hidden.id = this.options.id; // Custom code for Comments
        this.element.appendChild(this.hidden);              
        // build out each child
        for(i=0; i < this.children.length; i++) {
            this.children[i] = new SingleStar(this, i);
            this.element.appendChild(this.children[i].element);
        }
        if( this.options.feedback ) {
            this.feedback = document.createElement('div');
            this.feedback.className = "feedback";
            this.feedback.style.cssFloat = this.options.align;
            this.element.appendChild(this.feedback);
        }   
        // startup
        this.selected = this.options.startAt;
        this.reset(this.selected);
    },
    set: function(index) {
        if(debug) console.log('set index '+ index);
        // set the child
        for(var i=1; i < this.children.length; i++)
            this.children[i].element.style.backgroundPosition = (i <= index) ? "0 -" + this.options.height * 2 + "px" : "0 0";
        if(this.options.feedback) 
            this.feedback.innerHTML = this.children[index].value;
        this.selected = index;
        // set the form value
        this.hidden.value = this.children[index].value;
        if(debug) console.log('set value ' + this.hidden.value);
    },
    show: function(index) {
        if(debug) console.log('show index '+ index);        
        // show the child
        for(var i=1; i < this.children.length; i++)
            this.children[i].element.style.backgroundPosition = (i <= index) ? "0 -" + this.options.height + "px" : "0 0";
        if(this.options.feedback)
            this.feedback.innerHTML = this.children[index].value;   
    },
    reset: function() { this.set(this.selected); },
    clear: function() {
        for(var i=1; i < this.children.length; i++)
            this.children[i].element.style.backgroundPosition = "0 0";
    }
};

// Class: SingleStar(parent_object, index of that parent's children)
// Not to be called directly, inherits its options from a Starry object
var SingleStar = Class.create();
SingleStar.prototype = {
    initialize: function(parent, index) {
        this.parent = parent;
        this.index = index;
        if(debug) console.log('Creating star at index '+ this.index);
        this.value = this.index * this.parent.options.multiplier;
        if(debug) console.log('value '+ this.value);
        this.element = document.createElement("div");
        this.element.style.width = this.parent.options.width + "px";
        this.element.style.height = this.parent.options.height + "px";
        this.element.style.backgroundImage = "url(" + this.parent.options.sprite + ")";
        this.element.style.backgroundPosition = (this.index == 0) ? "0 -" + this.parent.options.height * 3  +"px" : "0 0";
        this.element.className = "standard_star";
        this.element.style.cssFloat = this.parent.options.align;
        if(!this.parent.options.showNull && this.index == 0) this.element.style.display = "none";
        this.element.onclick = function() { this.parent.set(this.index); }.bind(this);
        this.element.onmouseover = function() { this.parent.show(this.index); }.bind(this);
        this.element.onmouseout = this.parent.reset.bind(this.parent);
        if(debug) console.log('set onclick handler');
    }
};

// this function manages an auto_increment for id's
var id = { start: 0, prev: 0, next: function() { return this.start + this.prev++; } };