/*
Copyright (c) 2009 Justin Donato (http://www.justindonato.com)

Permission is hereby granted, free of charge, to any person obtaining a copy
of this software and associated documentation files (the "Software"), to deal
in the Software without restriction, including without limitation the rights
to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
copies of the Software, and to permit persons to whom the Software is
furnished to do so, subject to the following conditions:

The above copyright notice and this permission notice shall be included in
all copies or substantial portions of the Software.

THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
THE SOFTWARE.

MTMultiSelect: An widget to make more user friendly interfaces
for a multiselect box, using Mootools    

Usage:

Link to this file, then add 

window.addEvent('domready', function (){
     $$('.multiselect').each(function(multiselect){
        new MTMultiWidget({'datasrc': multiselect});
    });
        
});

to your page, where '.multiselect' is a selector that picks out a class of
<select MULTIPLE> elements. This element acts as the data source for the
widget. Then create a css file and style the widget however you'd like. 

Options: add these to the object you pass to the MTMultiWidget constructor.
Only datasrc is required.

widgetcls:
The css class applied to your final widget.
Default is 'mtmultiselect'

datasrc:
A select multiple dom object

selectedcls:
The css class of the selected list item.
Default is  'selected'

paginator_on_bottom:
Determines placement of paginator, true or false.
Default is true

items_per_page:
Determines how many items to show on a single page.
Default is 10.

case_sensitive:
Determines if the filter form is case_sensitive or not
Default is False
   
*/

var MTMultiWidget = new Class({
    
    Implements: [Options],
            
    options: {
        'widgetcls': 'mtmultiselect', // the class for your final widget
        'datasrc': null  // a select multiple dom object
    },
    
    handleDisplayEvent: function(numselected){
        this.filterform.update(numselected);
    },
    
    handleFilterEvent: function(list){
        this.curlist = list;
        this.paginator.setpagenum(1);
        var page = this.paginator.getpage(list);
        this.displaylist.build(page);
    },

    handlePaginatorEvent: function(){
        var page = this.paginator.getpage(this.curlist);
        this.displaylist.build(page);
    },
    
    initialize: function(options){            
        this.setOptions(options);
        // Hide the original data source and create a new div for the widget
        // and inect this new widget into the Dom.
        options.datasrc.setStyles({'display': 'None'});
        var view = new Element('div', {'class': this.options.widgetcls});
        view.injectAfter(options.datasrc);
        //options.datasrc.getParent().grab(view);
        // Add the widget to the options. Pass them into a new DisplayList
        options.view = view;
        
        this.displaylist = new DisplayList(options);
        options.numselected = this.displaylist.numselected();
        this.filterform = new FilterForm(options);
        this.paginator = new Paginator(options);
        
        this.curlist = this.options.datasrc.getChildren();
        
        this.displaylist.addEvent('rebuild', this.handleDisplayEvent.bind(this));
        this.filterform.addEvent('rebuild', this.handleFilterEvent.bind(this));
        this.paginator.addEvent('rebuild', this.handlePaginatorEvent.bind(this));            
        
        var page = this.paginator.getpage(this.curlist);
        this.filterform.build();            
        this.displaylist.build(page);
    }
});

/*
    DisplayList
*/    

var DisplayList = new Class({
    
    Implements: [Options, Events],
    
    options: {
        selectedcls: 'selected', // class of the item when its selected
        datasrc: null, // a multiple select dom elemenet
        view: null, // A parent or wrapper dom element where this element lives
        paginator_on_bottom: true
    },
    
    initialize: function(options){            
        this.setOptions(options);
    },
    
    build: function(opts){
        
        // If there's already an ol, remove it.
        var old = this.options.view.getElement('ol');
        if(old !== null) old.destroy();
        
        // create the list to hold the visible elements
        list = new Element('ol');
        place = this.options.paginator_on_bottom ? 'before' : 'after';
        list.inject(this.options.view.getLast(), place);
        //this.options.view.grab(list);
        
        opts.each(function(item){ 
                var li = new Element('li',{
                    'class': item.selected ? this.options.selectedcls : null,
                    'text': item.get('text')
                });
                li.store('select', item);                    
                list.grab(li);     
                
                li.addEvent('click', function(evt){
                    evt.target.toggleClass('selected');
                    evt.target.retrieve('select').selected = evt.target.hasClass('selected');                        
                    this.fireEvent('rebuild', this.numselected());
                }.bind(this));
            }.bind(this));
    },
    
    total: function(){
        return this.options.datasrc.getChildren().length;
    },
    
    numselected: function(){
        var numselected = 0;            
        this.options.datasrc.getChildren().each(function(item){
            if(item.selected) numselected++;
        });
        return numselected;
    }        
    
});
    
/*
    Paginator
*/    

var Paginator = new Class({
    Implements: [Options, Events],
    
    /* Paginator might have to look at weather an item is hidden or not */
    
    options: {
        'items_per_page': 10,
        'list': [], // the list the paginator will use
        'displaylist': null // the view element for the results
    },
    
    initialize: function(options){
        this.setOptions(options);
        this.items_per_page = this.options.items_per_page;
        this.page = 1;
        // create the view element
        this.controls = new Element('div', {'class':'mtms_paginator'});
        this.options.view.grab(this.controls);
    },
    
    numpages: function(list){
        return Math.ceil(list.length / this.items_per_page );
    },
    
    getpage: function(list){
        var start = ((this.page - 1) * this.items_per_page);
        var end = start + this.items_per_page;
        this.updateControls(list);
        return list.slice(start, end); 
    },
    
    pageup: function(){
        this.page++;
    },
    
    pagedown: function(){
        this.page--;
    },
    
    updateControls: function(list){
        
        var numpages = this.numpages(list);
        this.controls.empty();
        
        var prevbtn = new Element('a', {'html':'Zur&uuml;ck',
                                        'href':'#cpcspswdnbd'});
        this.controls.grab(prevbtn, 'top');
        prevbtn.addClass('disabled');
        
        if(this.page > 1){
            prevbtn.removeClass('disabled');
            prevbtn.addEvent('click', function(evt){
                this.pagedown();
                this.fireEvent('rebuild', list);                     
            }.bind(this));
        }
        
        for(var i = 1; i <= numpages; i++){
            this.controls.grab(new Element('a', {'text': i,
                                                 'href': '#cpcspswdnbd',
                                                 'class': (i  == this.page) ? 'selected' : '',
                                                 'events': {
                                                    'click': function(evt){
                                                        this.setpagenum(evt.target.innerHTML);
                                                        this.fireEvent('rebuild', [list]); // wrapped list
                                                    }.bind(this)}
                                           }), 'bottom');
        }

        var nextbtn = new Element('a', {'text':'Weiter',
                                        'href':'#cpcspswdnbd'});
        this.controls.grab(nextbtn);
        nextbtn.addClass('disabled');
            
        if(this.page < numpages){
            nextbtn.removeClass('disabled');
            nextbtn.addEvent('click', function(evt){
                this.pageup();
                this.fireEvent('rebuild');
            }.bind(this));
        }            
        

    },
    
    setpagenum: function(pagenum){
        this.page = Number(pagenum);
    }
});

/*
    FilterForm
*/

var FilterForm = new Class({
    
    RESETINPUT: true,
    
    Implements: [Options, Events],        
    
    options: {
        view: null,
        case_sensitive: false,
        displaylist: null,
        inputpos: 'top',            
        labels: {'total': 'Gesamt',
                 'selected': 'Ausgew&auml;hlt',
                 'unselected': 'Nicht ausgew&auml;hlt',
                 'filter': 'filter',
                 'in': 'in',
                 'out': 'out',
                 'page': 'Seite'
                },
        classes: {
            'total': 'mttotal',
            'selected': 'mtselected'
        }
    },
    
    initialize: function(options){
        this.setOptions(options);
        this.numselected = options.numselected;
    },
    
    build: function(){
        // infofilter bar is made out of a u list
        var ul = new Element('ul', {'class': 'mtms_filtercontrols'});
        this.options.view.grab(ul, this.options.inputpos);
        
        this.totalbtn = this.makebtn(this.options.labels.total,
                     this.showtotal,
                     this.options.datasrc.getChildren().length);
        ul.grab(this.totalbtn);
        
        this.selectedbtn = this.makebtn(this.options.labels.selected,
                                this.showselected,
                                this.numselected);
        ul.grab(this.selectedbtn);
        
        this.unselectedbtn = this.makebtn(this.options.labels.unselected,
                                this.showunselected,
                                this.options.datasrc.getChildren().length - this.numselected);
        ul.grab(this.unselectedbtn);
        
        // Make text field for filter
        // On keyup, the displaylist.filter is called with a function
        // that filters based on what's been entered in the textfield
        filterbox_container = new Element('div', {'class': 'mtms_filterbox'});            
        this.filterbox = new Element('input', {
            'events': {
                'keyup': function(evt){                        
                    if(this.options.case_sensitive){
                        filter_by_text = function(item){ return item.text.contains(evt.target.value)};
                    } else {
                        filter_by_text = function(item){ return item.text.toLowerCase().contains(evt.target.value.toLowerCase()) };
                    }
                    this.filter(this.options.datasrc.getChildren(), filter_by_text);
                }.bind(this)
            }
        });
        filterbox_container.grab(this.filterbox);
        
        this.options.view.grab(filterbox_container, this.options.inputpos);
    },                       

    /*
       label: clickable link text
       func: the function that is called when clicked
       prefix: some bit of text that precedes the label. (Used to show
       counts here.)
       
    */
    makebtn: function(label, func, prefix){
        var li = new Element('li');  
        if(label != "Gesamt") {
        	//var border = new Element('span', {'text': " |"});
        	//li.grab(border);
        }
        var btn = new Element('a', {'html': label,
                                    'href': '#cpcspswdnbd',
                                    'events': {
                                         // You might have to bind this differently
                                        'click': func.bind(this)
                                    }
                                });
        li.grab(btn);
        if(prefix !== undefined){
            prefix = new Element('span', {'text': prefix});
            li.grab(prefix);                
        }
        return li;
    },
    
    showtotal: function(){
        ('show total called');
        // return true for every item in the datasrc
        this.filter(this.options.datasrc.getChildren(),
            function(item){
                return true;
            },
            this.RESETINPUT    
        );
    },
    showselected: function(){
        this.filter(this.options.datasrc.getChildren(),
            function(item){
                return (item.selected === true);
            },
            this.RESETINPUT                
        );
    },
    showunselected:function(){
        this.filter(this.options.datasrc.getChildren(),
            function(item){
                return (item.selected !== true);
            },
            this.RESETINPUT                
        );
    },
    // list is the list of option dom elements from the select elem
    // test is a function that gets used in the filter
    filter: function(list, test, reset){
        results = list.filter(function(item, index){
            return test(item);
        });
        
        if(reset){
            this.filterbox.value = "";
        }
        this.fireEvent('rebuild', [results]);
    },
    update: function(numselected){
        var total = this.options.datasrc.getChildren().length;
        this.totalbtn.getElement('span').set('text', total);
        this.selectedbtn.getElement('span').set('text', numselected);
        this.unselectedbtn.getElement('span').set('text', total - numselected);            
    }
});

Element.Events.rebuild = {
    'base': 'change',
    'condition': function(evt){
        return;
    }
};