/**
Select2 input. Based on amazing work of Igor Vaynberg https://github.com/ivaynberg/select2.  
Please see [original select2 docs](http://ivaynberg.github.com/select2) for detailed description and options.  
 
You should manually download and include select2 distributive:  

    <link href="select2/select2.css" rel="stylesheet" type="text/css"></link>  
    <script src="select2/select2.js"></script>  
    
To make it **bootstrap-styled** you can use css from [here](https://github.com/t0m/select2-bootstrap-css): 

    <link href="select2-bootstrap.css" rel="stylesheet" type="text/css"></link>    
    
**Note:** currently `autotext` feature does not work for select2 with `ajax` remote source.    
You need initially put both `data-value` and element's text youself:    

    <a href="#" data-type="select2" data-value="1">Text1</a>
    
    
@class select2
@extends abstractinput
@since 1.4.1
@final
@example
<a href="#" id="country" data-type="select2" data-pk="1" data-value="ru" data-url="/post" data-title="Select country"></a>
<script>
$(function(){
    //local source
    $('#country').editable({
        source: [
              {id: 'gb', text: 'Great Britain'},
              {id: 'us', text: 'United States'},
              {id: 'ru', text: 'Russia'}
           ],
        select2: {
           multiple: true
        }
    });
    //remote source (simple)
    $('#country').editable({
        source: '/getCountries',
        select2: {
            placeholder: 'Select Country',
            minimumInputLength: 1
        }
    });
    //remote source (advanced)
    $('#country').editable({
        select2: {
            placeholder: 'Select Country',
            allowClear: true,
            minimumInputLength: 3,
            id: function (item) {
                return item.CountryId;
            },
            ajax: {
                url: '/getCountries',
                dataType: 'json',
                data: function (term, page) {
                    return { query: term };
                },
                results: function (data, page) {
                    return { results: data };
                }
            },
            formatResult: function (item) {
                return item.CountryName;
            },
            formatSelection: function (item) {
                return item.CountryName;
            },
            initSelection: function (element, callback) {
                return $.get('/getCountryById', { query: element.val() }, function (data) {
                    callback(data);
                });
            } 
        }  
    });
});
</script>
**/
(function ($) {
    "use strict";
    
    var Constructor = function (options) {
        this.init('select2', options, Constructor.defaults);

        options.select2 = options.select2 || {};

        this.sourceData = null;
        
        //placeholder
        if(options.placeholder) {
            options.select2.placeholder = options.placeholder;
        }
       
        //if not `tags` mode, use source
        if(!options.select2.tags && options.source) {
            var source = options.source;
            //if source is function, call it (once!)
            if ($.isFunction(options.source)) {
                source = options.source.call(options.scope);
            }               

            if (typeof source === 'string') {
                options.select2.ajax = options.select2.ajax || {};
                //some default ajax params
                if(!options.select2.ajax.data) {
                    options.select2.ajax.data = function(term) {return { query:term };};
                }
                if(!options.select2.ajax.results) {
                    options.select2.ajax.results = function(data) { return {results:data };};
                }
                options.select2.ajax.url = source;
            } else {
                //check format and convert x-editable format to select2 format (if needed)
                this.sourceData = this.convertSource(source);
                options.select2.data = this.sourceData;
            }
        } 

        //overriding objects in config (as by default jQuery extend() is not recursive)
        this.options.select2 = $.extend({}, Constructor.defaults.select2, options.select2);

        //detect whether it is multi-valued
        this.isMultiple = this.options.select2.tags || this.options.select2.multiple;
        this.isRemote = ('ajax' in this.options.select2);

        //store function returning ID of item
        //should be here as used inautotext for local source
        this.idFunc = this.options.select2.id;
        if (typeof(this.idFunc) !== "function") {
            var idKey = this.idFunc || 'id';
            this.idFunc = function (e) { return e[idKey]; };
        }

        //store function that renders text in select2
        this.formatSelection = this.options.select2.formatSelection;
        if (typeof(this.formatSelection) !== "function") {
            this.formatSelection = function (e) { return e.text; };
        }
    };

    $.fn.editableutils.inherit(Constructor, $.fn.editabletypes.abstractinput);

    $.extend(Constructor.prototype, {
        render: function() {
            this.setClass();

            //can not apply select2 here as it calls initSelection 
            //over input that does not have correct value yet.
            //apply select2 only in value2input
            //this.$input.select2(this.options.select2);

            //when data is loaded via ajax, we need to know when it's done to populate listData
            if(this.isRemote) {
                //listen to loaded event to populate data
                this.$input.on('select2-loaded', $.proxy(function(e) {
                    this.sourceData = e.items.results;
                }, this));
            }

            //trigger resize of editableform to re-position container in multi-valued mode
            if(this.isMultiple) {
               this.$input.on('change', function() {
                   $(this).closest('form').parent().triggerHandler('resize');
               });
            }
       },

       value2html: function(value, element) {
           var text = '', data,
               that = this;

           if(this.options.select2.tags) { //in tags mode just assign value
              data = value; 
              //data = $.fn.editableutils.itemsByValue(value, this.options.select2.tags, this.idFunc);
           } else if(this.sourceData) {
              data = $.fn.editableutils.itemsByValue(value, this.sourceData, this.idFunc); 
           } else {
              //can not get list of possible values 
              //(e.g. autotext for select2 with ajax source)
           }

           //data may be array (when multiple values allowed)
           if($.isArray(data)) {
               //collect selected data and show with separator
               text = [];
               $.each(data, function(k, v){
                   text.push(v && typeof v === 'object' ? that.formatSelection(v) : v);
               });
           } else if(data) {
               text = that.formatSelection(data);
           }

           text = $.isArray(text) ? text.join(this.options.viewseparator) : text;

           //$(element).text(text);
           Constructor.superclass.value2html.call(this, text, element); 
       },

       html2value: function(html) {
           return this.options.select2.tags ? this.str2value(html, this.options.viewseparator) : null;
       },

       value2input: function(value) {
           // if value array => join it anyway
           if($.isArray(value)) {
              value = value.join(this.getSeparator());
           }

           //for remote source just set value, text is updated by initSelection
           if(!this.$input.data('select2')) {
               this.$input.val(value);
               this.$input.select2(this.options.select2);
           } else {
               //second argument needed to separate initial change from user's click (for autosubmit)   
               this.$input.val(value).trigger('change', true); 

               //Uncaught Error: cannot call val() if initSelection() is not defined
               //this.$input.select2('val', value);
           }

           // if defined remote source AND no multiple mode AND no user's initSelection provided --> 
           // we should somehow get text for provided id.
           // The solution is to use element's text as text for that id (exclude empty)
           if(this.isRemote && !this.isMultiple && !this.options.select2.initSelection) {
               // customId and customText are methods to extract `id` and `text` from data object
               // we can use this workaround only if user did not define these methods
               // otherwise we cant construct data object
               var customId = this.options.select2.id,
                   customText = this.options.select2.formatSelection;

               if(!customId && !customText) {
                   var $el = $(this.options.scope);
                   if (!$el.data('editable').isEmpty) {
                       var data = {id: value, text: $el.text()};
                       this.$input.select2('data', data); 
                   }
               }
           }
       },
       
       input2value: function() { 
           return this.$input.select2('val');
       },

       str2value: function(str, separator) {
            if(typeof str !== 'string' || !this.isMultiple) {
                return str;
            }

            separator = separator || this.getSeparator();

            var val, i, l;

            if (str === null || str.length < 1) {
                return null;
            }
            val = str.split(separator);
            for (i = 0, l = val.length; i < l; i = i + 1) {
                val[i] = $.trim(val[i]);
            }

            return val;
       },

        autosubmit: function() {
            this.$input.on('change', function(e, isInitial){
                if(!isInitial) {
                  $(this).closest('form').submit();
                }
            });
        },

        getSeparator: function() {
            return this.options.select2.separator || $.fn.select2.defaults.separator;
        },

        /*
        Converts source from x-editable format: {value: 1, text: "1"} to
        select2 format: {id: 1, text: "1"}
        */
        convertSource: function(source) {
            if($.isArray(source) && source.length && source[0].value !== undefined) {
                for(var i = 0; i<source.length; i++) {
                    if(source[i].value !== undefined) {
                        source[i].id = source[i].value;
                        delete source[i].value;
                    }
                }
            }
            return source;
        },
        
        destroy: function() {
            if(this.$input.data('select2')) {
                this.$input.select2('destroy');
            }
        }
        
    });

    Constructor.defaults = $.extend({}, $.fn.editabletypes.abstractinput.defaults, {
        /**
        @property tpl 
        @default <input type="hidden">
        **/
        tpl:'<input type="hidden">',
        /**
        Configuration of select2. [Full list of options](http://ivaynberg.github.com/select2).

        @property select2 
        @type object
        @default null
        **/
        select2: null,
        /**
        Placeholder attribute of select

        @property placeholder 
        @type string
        @default null
        **/
        placeholder: null,
        /**
        Source data for select. It will be assigned to select2 `data` property and kept here just for convenience.
        Please note, that format is different from simple `select` input: use 'id' instead of 'value'.
        E.g. `[{id: 1, text: "text1"}, {id: 2, text: "text2"}, ...]`.

        @property source 
        @type array|string|function
        @default null        
        **/
        source: null,
        /**
        Separator used to display tags.

        @property viewseparator 
        @type string
        @default ', '        
        **/
        viewseparator: ', '
    });

    $.fn.editabletypes.select2 = Constructor;

}(window.jQuery));
