var Stars = Class.create();
Stars.prototype = {
    /**
    * Mouse X position
    * @var {Number} options
    */
    _x: 0,
    /**
    * Mouse X position
    * @var {Number} options
    */
    _y: 0,
    /**
    * Constructor
    * @param {Object} options
    */
    initialize: function(options) {

        /**
        * Initialized?
        * @var (Boolean)
        */
        this._initialized = false;

        /**
        * Base option values
        * @var (Object)
        */
        this.options = {
            bindField: null, 		// Form Field to bind the value to
            maxRating: 5, 			// Maximum rating, determines number of stars
            container: null, 		// Container of stars
            imagePath: 'images/', 	// Path to star images
            callback: null, 			// Callback function, fires when the stars are clicked
            actionURL: null, 		// URL to call when clicked. The rating will be appended to the end of the URL (eg: /rate.php?id=5&rating=)
            value: 0, 				// Initial Value
            locked: false
        };
        Object.extend(this.options, options);
        this.locked = this.options.locked ? true : false;
        /**
        * Image sources for hover and user-set state ratings
        */
        this._starSrc = {
            empty: this.options.imagePath + "star-empty.gif",
            full: this.options.imagePath + "star.gif",
            half: this.options.imagePath + "star-half.gif"
        };
        /**
        * Preload images
        */
        for (var x in this._starSrc) {
            var y = new Image();
            y.src = this._starSrc[x];
        }

        document.getElem

        /**
        * Images to show for pre-set values, changes when hovered, if not locked.
        */
        this._setStarSrc = {
            empty: this.options.imagePath + "star-ps-empty.gif",
            full: this.options.imagePath + "star-ps.gif",
            half: this.options.imagePath + "star-ps-half.gif"
        };

        /**
        * Preload images
        */
        for (var x in this._setStarSrc) {
            var y = new Image();
            y.src = this._setStarSrc[x];
        }

        this.value = -1;
        this.stars = [];
        this._clicked = false;


        if (this.options.container) {
            this._container = $(this.options.container);
            this.id = this._container.id;
        }
        else {
            this.id = 'starsContainer.' + Math.random(0, 100000);
            document.write('<span id="' + this.id + '"></span>');
            this._container = $(this.id);
        }
        this._display();
        this.setValue(this.options.value);
        this._initialized = true;
    },
    _display: function() {
        for (var i = 0; i < this.options.maxRating; i++) {
            var star = new Image();
            star.src = this.locked ? this._starSrc.empty : this._setStarSrc.empty;
            star.style.cursor = 'pointer';
            star.title = 'Rate as ' + (i + 1);
            !this.locked && Event.observe(star, 'mouseover', this._starHover.bind(this));
            !this.locked && Event.observe(star, 'click', this._starClick.bind(this));
            !this.locked && Event.observe(star, 'mouseout', this._starClear.bind(this));
            this.stars.push(star);
            this._container.appendChild(star);
        }
    },
    _starHover: function(e) {
        if (this.locked) return;
        if (!e) e = window.event;
        var star = Event.element(e);

        var greater = false;
        for (var i = 0; i < this.stars.length; i++) {
            this.stars[i].src = greater ? this._starSrc.empty : this._starSrc.full;
            if (this.stars[i] == star) greater = true;
        }
    },
    _starClick: function(e) {
        if (this.locked) return;
        if (!e) e = window.event;
        var star = Event.element(e);
        this._clicked = true;
        for (var i = 0; i < this.stars.length; i++) {
            if (this.stars[i] == star) {
                this.setValue(i + 1);
                break;
            }
        }
    },
    _starClear: function(e) {
        if (this.locked && this._initialized) return;
        var greater = false;
        for (var i = 0; i < this.stars.length; i++) {
            if (i > this.value) greater = true;
            if ((this._initialized && this._clicked) || this.value == -1)
                this.stars[i].src = greater ? (this.value + .5 == i) ? this._starSrc.half : this._starSrc.empty : this._starSrc.full;
            else
                this.stars[i].src = greater ? (this.value + .5 == i) ? this._setStarSrc.half : this._setStarSrc.empty : this._setStarSrc.full;
        }
    },
    /**
    * Sets the value of the star object, redraws the UI
    * @param {Number} value to set
    * @param {Boolean} optional, do the callback function, default true
    */
    setValue: function(val) {
        var doCallBack = arguments.length > 1 ? !!arguments[1] : true;
        if (this.locked && this._initialized) return;
        this.value = val - 1; //0-based
        if (this.options.bindField)
            $(this.options.bindField).value = val;
        if (this._initialized && doCallBack) {
            if (this.options.actionURL)
                new Ajax.Request(this.options.actionURL + val, { onComplete: this.options['callback'], method: 'get' });
            else
                if (this.options.callback)
                this.options['callback'](val);
        }
        this._starClear();
    }
};