/**
* EditableForm utilites
*/
(function ($) {
    //utils
    $.fn.editableutils = {
        /**
        * classic JS inheritance function
        */  
        inherit: function (Child, Parent) {
            var F = function() { };
            F.prototype = Parent.prototype;
            Child.prototype = new F();
            Child.prototype.constructor = Child;
            Child.superclass = Parent.prototype;
        },

        /**
        * set caret position in input
        * see http://stackoverflow.com/questions/499126/jquery-set-cursor-position-in-text-area
        */        
        setCursorPosition: function(elem, pos) {
            if (elem.setSelectionRange) {
                elem.setSelectionRange(pos, pos);
            } else if (elem.createTextRange) {
                var range = elem.createTextRange();
                range.collapse(true);
                range.moveEnd('character', pos);
                range.moveStart('character', pos);
                range.select();
            }
        },

        /**
        * function to parse JSON in *single* quotes. (jquery automatically parse only double quotes)
        * That allows such code as: <a data-source="{'a': 'b', 'c': 'd'}">
        * safe = true --> means no exception will be thrown
        * for details see http://stackoverflow.com/questions/7410348/how-to-set-json-format-to-html5-data-attributes-in-the-jquery
        */
        tryParseJson: function(s, safe) {
            if (typeof s === 'string' && s.length && s.match(/^[\{\[].*[\}\]]$/)) {
                if (safe) {
                    try {
                        /*jslint evil: true*/
                        s = (new Function('return ' + s))();
                        /*jslint evil: false*/
                    } catch (e) {} finally {
                        return s;
                    }
                } else {
                    /*jslint evil: true*/
                    s = (new Function('return ' + s))();
                    /*jslint evil: false*/
                }
            }
            return s;
        },

        /**
        * slice object by specified keys
        */
        sliceObj: function(obj, keys, caseSensitive /* default: false */) {
            var key, keyLower, newObj = {};

            if (!$.isArray(keys) || !keys.length) {
                return newObj;
            }

            for (var i = 0; i < keys.length; i++) {
                key = keys[i];
                if (obj.hasOwnProperty(key)) {
                    newObj[key] = obj[key];
                }

                if(caseSensitive === true) {
                    continue;
                }

                //when getting data-* attributes via $.data() it's converted to lowercase.
                //details: http://stackoverflow.com/questions/7602565/using-data-attributes-with-jquery
                //workaround is code below.
                keyLower = key.toLowerCase();
                if (obj.hasOwnProperty(keyLower)) {
                    newObj[key] = obj[keyLower];
                }
            }

            return newObj;
        },

        /*
        exclude complex objects from $.data() before pass to config
        */
        getConfigData: function($element) {
            var data = {};
            $.each($element.data(), function(k, v) {
                if(typeof v !== 'object' || (v && typeof v === 'object' && (v.constructor === Object || v.constructor === Array))) {
                    data[k] = v;
                }
            });
            return data;
        },

        /*
         returns keys of object
        */
        objectKeys: function(o) {
            if (Object.keys) {
                return Object.keys(o);  
            } else {
                if (o !== Object(o)) {
                    throw new TypeError('Object.keys called on a non-object');
                }
                var k=[], p;
                for (p in o) {
                    if (Object.prototype.hasOwnProperty.call(o,p)) {
                        k.push(p);
                    }
                }
                return k;
            }

        },
        
       /**
        method to escape html.
       **/
       escape: function(str) {
           return $('<div>').text(str).html();
       },
       
       /*
        returns array items from sourceData having value property equal or inArray of 'value'
       */
       itemsByValue: function(value, sourceData, valueProp) {
           if(!sourceData || value === null) {
               return [];
           }
           
           valueProp = valueProp || 'value';
                      
           var isValArray = $.isArray(value),
           result = [], 
           that = this;

           $.each(sourceData, function(i, o) {
               if(o.children) {
                   result = result.concat(that.itemsByValue(value, o.children));
               } else {
                   /*jslint eqeq: true*/
                   if(isValArray) {
                       if($.grep(value, function(v){  return v == (o && typeof o === 'object' ? o[valueProp] : o); }).length) {
                           result.push(o); 
                       }
                   } else {
                       if(value == (o && typeof o === 'object' ? o[valueProp] : o)) {
                           result.push(o); 
                       }
                   }
                   /*jslint eqeq: false*/
               }
           });
           
           return result;
       },
       
       /*
       Returns input by options: type, mode. 
       */
       createInput: function(options) {
           var TypeConstructor, typeOptions, input,
           type = options.type;

           //`date` is some kind of virtual type that is transformed to one of exact types
           //depending on mode and core lib
           if(type === 'date') {
               //inline
               if(options.mode === 'inline') {
                   if($.fn.editabletypes.datefield) {
                       type = 'datefield';
                   } else if($.fn.editabletypes.dateuifield) {
                       type = 'dateuifield';
                   }
               //popup
               } else {
                   if($.fn.editabletypes.date) {
                       type = 'date';
                   } else if($.fn.editabletypes.dateui) {
                       type = 'dateui';
                   }
               }
               
               //if type still `date` and not exist in types, replace with `combodate` that is base input
               if(type === 'date' && !$.fn.editabletypes.date) {
                   type = 'combodate';
               } 
           }

           //change wysihtml5 to textarea for jquery UI and plain versions
           if(type === 'wysihtml5' && !$.fn.editabletypes[type]) {
               type = 'textarea';
           }

           //create input of specified type. Input will be used for converting value, not in form
           if(typeof $.fn.editabletypes[type] === 'function') {
               TypeConstructor = $.fn.editabletypes[type];
               typeOptions = this.sliceObj(options, this.objectKeys(TypeConstructor.defaults));
               input = new TypeConstructor(typeOptions);
               return input;
           } else {
               $.error('Unknown type: '+ type);
               return false; 
           }  
       }            
       
    };      
}(window.jQuery));
