/*!
 * jQuery Selectbox plugin 0.1.2
 *
 * EXTENDED BY MICHAEL WOLTHERS, careful when upgrading!
 * 
 * Added speed setting, 
 * 
 * Copyright 2011, Dimitar Ivanov (http://www.bulgaria-web-developers.com/projects/javascript/selectbox/)
 * Licensed under the MIT (http://www.opensource.org/licenses/mit-license.php) license.
 * 
 * Date: Fri Mar 18 22:28:49 2011 +0200
 * 
 * 
 */
(function ($, undefined) {
    var PROP_NAME = 'selectbox',
        FALSE = false,
        TRUE = true,
        DEFAULT_Z = 10000;
    /**
     * Selectbox manager.
     * Use the singleton instance of this class, $.selectbox, to interact with the select box.
     * Settings for (groups of) select boxes are maintained in an instance object,
     * allowing multiple different settings on the same page
     */
    function Selectbox() {
        this._state = [];
        this._defaults = { // Global defaults for all the select box instances
            classHolder: "sbHolder",
            classHolderDisabled: "sbHolderDisabled",
            classSelector: "sbSelector",
            classOptions: "sbOptions",
            classToggleOpen: "sbToggleOpen",
            classToggle: "sbToggle",
            effect: "slide", // "slide" or "fade"
            onChange: null, //Define a callback function when the selectbox is changed
            onOpen: null, //Define a callback function when the selectbox is open
            onClose: null, //Define a callback function when the selectbox is closed
            speed: 250
        };
    }
    
    $.extend(Selectbox.prototype, {
        /**
         * Is the first field in a jQuery collection open as a selectbox
         * 
         * @param {Object} target
         * @return {Boolean}
         */
        _isOpenSelectbox: function (target) {
            if (!target) {
                return FALSE;
            }
            var inst = this._getInst(target);
            return inst.isOpen;
        },
        /**
         * Is the first field in a jQuery collection disabled as a selectbox
         * 
         * @param {HTMLElement} target
         * @return {Boolean}
         */
        _isDisabledSelectbox: function (target) {
            if (!target) {
                return FALSE;
            }
            var inst = this._getInst(target);
            return inst.isDisabled;
        },
        /**
         * Attach the select box to a jQuery selection.
         * 
         * @param {HTMLElement} target
         * @param {Object} settings
         */
        _attachSelectbox: function (target, settings) {
            if (this._getInst(target)) {
                return FALSE;
            }
            var $target = $(target),
                self = this,
                inst = self._newInst($target),
                sbHolder, sbSelector, sbToggle, sbOptions,
                s = FALSE, opts = $target.find("option"), olen = opts.length;
                
            $target.attr("sb", inst.uid);
                
            $.extend(inst.settings, self._defaults, settings);
            self._state[inst.uid] = FALSE;
            $target.hide();
            
            function closeOthers() {
                var key, uid = this.attr("id").split("_")[1];
                for (key in self._state) {
                    if (key !== uid) {
                        if (self._state.hasOwnProperty(key)) {
                            if ($(":input[sb='" + key + "']")[0]) {
                                self._closeSelectbox($(":input[sb='" + key + "']")[0]);
                            }
                        }
                    }
                }
            }
            
            sbHolder = $("<div>", {
                "id": "sbHolder_" + inst.uid,
                "class": inst.settings.classHolder
            });
            
            sbSelector = $("<a>", {
                "id": "sbSelector_" + inst.uid,
                "href": "#",
                "class": inst.settings.classSelector,
                "click": function (e) {
                    e.preventDefault();
                    closeOthers.apply($(this), []);
                    var uid = $(this).attr("id").split("_")[1];
                    if (self._state[uid]) {
                        self._closeSelectbox(target);
                    } else {
                        self._openSelectbox(target);
                    }
                }
            });
            
            sbToggle = $("<a>", {
                "id": "sbToggle_" + inst.uid,
                "href": "#",
                "class": inst.settings.classToggle,
                "click": function (e) {
                    e.preventDefault();
                    closeOthers.apply($(this), []);
                    var uid = $(this).attr("id").split("_")[1];
                    if (self._state[uid]) {
                        self._closeSelectbox(target);
                    } else {
                        self._openSelectbox(target);
                    }
                }
            });
            sbToggle.appendTo(sbHolder);

            sbOptions = $("<ul>", {
                "id": "sbOptions_" + inst.uid,
                "class": inst.settings.classOptions,
                "css": {
                    "display": "none"
                }
            });
            
            opts.each(function (i) {
                var that = $(this),
                    li = $("<li>");
                if (that.is(":selected")) {
                    sbSelector.text(that.text());
                    s = TRUE;
                }
                if (i === olen - 1) {
                    li.addClass("last");
                }
                $("<a>", {
                    "href": "#" + that.val(),
                    "rel": that.val(), 
                    "text": that.text(),
                    "click": function (e) {
                        e.preventDefault();
                        var t = sbToggle,
                            uid = t.attr("id").split("_")[1];
                        self._changeSelectbox(target, $(this).attr("rel"), $(this).text());
                        self._closeSelectbox(target);
                    }
                }).appendTo(li);
                li.appendTo(sbOptions);
            });
            if (!s) {
                sbSelector.text(opts.first().text());
            }
            
            $.data(target, PROP_NAME, inst);
            
            sbSelector.appendTo(sbHolder);
            sbOptions.appendTo(sbHolder);           
            sbHolder.insertAfter($target);
        },
        /**
         * Remove the selectbox functionality completely. This will return the element back to its pre-init state.
         * 
         * @param {HTMLElement} target
         */
        _detachSelectbox: function (target) {
            var inst = this._getInst(target);
            if (!inst) {
                return FALSE;
            }
            $("#sbHolder_" + inst.uid).remove();
            $.data(target, PROP_NAME, null);
            $(target).show();           
        },
        /**
         * Change selected attribute of the selectbox.
         * 
         * @param {HTMLElement} target
         * @param {String} value
         * @param {String} text
         */
        _changeSelectbox: function (target, value, text) {
            var inst = this._getInst(target),
                onChange = this._get(inst, 'onChange');
            $("#sbSelector_" + inst.uid).text(text);
            $(target).children("option[value='" + value + "']").attr("selected", TRUE);
            if (onChange) {
                onChange.apply((inst.input ? inst.input[0] : null), [value, inst]);
            } else if (inst.input) {
                inst.input.trigger('change');
            }
        },
        /**
         * Enable the selectbox.
         * 
         * @param {HTMLElement} target
         */
        _enableSelectbox: function (target) {
            var inst = this._getInst(target);
            if (!inst || !inst.isDisabled) {
                return FALSE;
            }
            $("#sbHolder_" + inst.uid).removeClass(inst.settings.classHolderDisabled);
            inst.isDisabled = FALSE;
            $.data(target, PROP_NAME, inst);
        },
        /**
         * Disable the selectbox.
         * 
         * @param {HTMLElement} target
         */
        _disableSelectbox: function (target) {
            var inst = this._getInst(target);
            if (!inst || inst.isDisabled) {
                return FALSE;
            }
            $("#sbHolder_" + inst.uid).addClass(inst.settings.classHolderDisabled);
            inst.isDisabled = TRUE;
            $.data(target, PROP_NAME, inst);
        },
        /**
         * Get or set any selectbox option. If no value is specified, will act as a getter.
         * 
         * @param {HTMLElement} target
         * @param {String} name
         * @param {Object} value
         */
        _optionSelectbox: function (target, name, value) {
            var inst = this._getInst(target);
            if (!inst) {
                return FALSE;
            }
            //TODO check name
            inst[name] = value;
            $.data(target, PROP_NAME, inst);
        },
        /**
         * Call up attached selectbox
         * 
         * @param {HTMLElement} target
         */
        _openSelectbox: function (target) {
            var inst = this._getInst(target);
            //if (!inst || this._state[inst.uid] || inst.isDisabled) {
            if (!inst || inst.isOpen || inst.isDisabled) {
                return;
            }
            var el = $("#sbOptions_" + inst.uid),
                viewportHeight = parseInt($(window).height(), 10),
                offset = $("#sbHolder_" + inst.uid).offset(),
                scrollTop = $(window).scrollTop(),
                height = el.prev().height(),
                diff = viewportHeight - (offset.top - scrollTop) - height / 2,
                onOpen = this._get(inst, 'onOpen');
            
            /* Edit by Michael Wolthers */
            DEFAULT_Z += 1;
            
            el.css({
                "top": height + "px",
                //"max-height": (diff - height) + "px",
                "z-index": DEFAULT_Z + 1
            }).parent().css({
                "z-index": DEFAULT_Z
            });
            /* End edit by Wolthers */
            
            
            inst.settings.effect === "fade" ? el.fadeIn(inst.settings.speed) : el.slideDown(inst.settings.speed);
            $("#sbToggle_" + inst.uid).addClass(inst.settings.classToggleOpen);
            this._state[inst.uid] = TRUE;
            inst.isOpen = TRUE;
            if (onOpen) {
                onOpen.apply((inst.input ? inst.input[0] : null), [inst]);
            }
            $.data(target, PROP_NAME, inst);
        },
        /**
         * Close opened selectbox
         * 
         * @param {HTMLElement} target
         */
        _closeSelectbox: function (target) {
            var inst = this._getInst(target),
                el = $("#sbOptions_" + inst.uid);
            //if (!inst || !this._state[inst.uid]) {
            if (!inst || !inst.isOpen) {
                return;
            }
            
            var onClose = this._get(inst, 'onClose');
            
            inst.settings.effect === "fade" ? el.fadeOut(inst.settings.speed) : el.slideUp(inst.settings.speed);
            
            $("#sbToggle_" + inst.uid).removeClass(inst.settings.classToggleOpen);
            this._state[inst.uid] = FALSE;
            inst.isOpen = FALSE;
            if (onClose) {
                onClose.apply((inst.input ? inst.input[0] : null), [inst]);
            }
            $.data(target, PROP_NAME, inst);
        },
        /**
         * Create a new instance object
         * 
         * @param {HTMLElement} target
         * @return {Object}
         */
        _newInst: function(target) {
            var id = target[0].id.replace(/([^A-Za-z0-9_-])/g, '\\\\$1');
            return {
                id: id, 
                input: target, 
                uid: Math.floor(Math.random() * 99999999),
                isOpen: FALSE,
                isDisabled: FALSE,
                settings: {}
            }; 
        },
        /**
         * Retrieve the instance data for the target control.
         * 
         * @param {HTMLElement} target
         * @return {Object} - the associated instance data
         * @throws error if a jQuery problem getting data
         */
        _getInst: function(target) {
            try {
                return $.data(target, PROP_NAME);
            }
            catch (err) {
                throw 'Missing instance data for this selectbox';
            }
        },
        /**
         * Get a setting value, defaulting if necessary
         * 
         * @param {Object} inst
         * @param {String} name
         * @return {Mixed}
         */
        _get: function(inst, name) {
            return inst.settings[name] !== undefined ? inst.settings[name] : this._defaults[name];
        }
    });

    /**
     * Invoke the selectbox functionality.
     * 
     * @param {Object|String} options
     * @return {Object}
     */
    $.fn.selectbox = function (options) {
        
        var otherArgs = Array.prototype.slice.call(arguments, 1);
        if (typeof options == 'string' && options == 'isDisabled') {
            return $.selectbox['_' + options + 'Selectbox'].apply($.selectbox, [this[0]].concat(otherArgs));
        }
        
        if (options == 'option' && arguments.length == 2 && typeof arguments[1] == 'string') {
            return $.selectbox['_' + options + 'Selectbox'].apply($.selectbox, [this[0]].concat(otherArgs));
        }
        
        return this.each(function() {
            typeof options == 'string' ?
                $.selectbox['_' + options + 'Selectbox'].apply($.selectbox, [this].concat(otherArgs)) :
                $.selectbox._attachSelectbox(this, options);
        });
    };
    
    $.selectbox = new Selectbox(); // singleton instance
    $.selectbox.version = "0.1.2";
})(jQuery);