/**
 * Copyright (c) 2010 Maxim Vasiliev
 *
 * 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.
 *
 *  
 * Date: 09.09.2010
 * Time: 19:02:33
 */

(function()
{
        /**
         * Returns form values represented as Javascript object
         * "name" attribute defines structure of resulting object
         *
         * @param rootNode {Element|String} root form element (or it's id)
         * @param delimiter {String} structure parts delimiter defaults to '.'
         * @param skipEmpty {Boolean} should skip empty text values, defaults to true
         */
        window.form2object = function(rootNode, delimiter, skipEmpty)
        {
                if (typeof skipEmpty == 'undefined' || skipEmpty == null) skipEmpty = true;
                if (typeof delimiter == 'undefined' || delimiter == null) delimiter = '.';
                rootNode = typeof rootNode == 'string' ? document.getElementById(rootNode) : rootNode;

                var formValues = getFormValues(rootNode);
                var result = {};
                var arrays = {};

                for (var i = 0; i < formValues.length; i++)
                {
                        var value = formValues[i].value;
                        if (skipEmpty && value === '') continue;

                        var name = formValues[i].name;
                        
                        if (name){
                        
	                        var nameParts = name.split(delimiter);
	
	                        var currResult = result;
	
	                        for (var j = 0; j < nameParts.length; j++)
	                        {
	                                var namePart = nameParts[j];
	
	                                var arrName;
	
	                                if (namePart.indexOf('[]') > -1 && j == nameParts.length - 1)
	                                {
	                                        arrName = namePart.substr(0, namePart.indexOf('['));
	
	                                        if (!currResult[arrName]) currResult[arrName] = [];
	                                        currResult[arrName].push(value);
	                                }
	                                else
	                                {
	                                        if (namePart.indexOf('[') > -1)
	                                        {
	                                                arrName = namePart.substr(0, namePart.indexOf('['));
	                                                var arrIdx = namePart.replace(/^[a-z]+\[|\]$/gi, '');
	
	                                                /*
	                                                 * Because arrIdx in field name can be not zero-based and step can be
	                                                 * other than 1, we can't use them in target array directly.
	                                                 * Instead we're making a hash where key is arrIdx and value is a reference to
	                                                 * added array element
	                                                 */
	
	                                                if (!arrays[arrName]) arrays[arrName] = {};
	                                                if (!currResult[arrName]) currResult[arrName] = [];
	
	                                                if (j == nameParts.length - 1)
	                                                {
	                                                        currResult[arrName].push(value);
	                                                }
	                                                else
	                                                {
	                                                        if (!arrays[arrName][arrIdx])
	                                                        {
	                                                                currResult[arrName].push({});
	                                                                arrays[arrName][arrIdx] = currResult[arrName][currResult[arrName].length - 1];
	                                                        }
	                                                }
	
	                                                currResult = arrays[arrName][arrIdx];
	                                        }
	                                        else
	                                        {
	                                                if (j < nameParts.length - 1) /* Not the last part of name - means object */
	                                                {
	                                                        if (!currResult[namePart]) currResult[namePart] = {};
	                                                        currResult = currResult[namePart];
	                                                }
	                                                else
	                                                {
	                                                        currResult[namePart] = value;
	                                                }
	                                        }
	                                }
	                        }
                        }
                }

                return result;
        };

        function getFormValues(rootNode)
        {
                var result = [], name;
                var currentNode = rootNode.firstChild;
                
                while (currentNode)
                {
                        if (currentNode.nodeName.match(/INPUT|SELECT|TEXTAREA|HIDDEN/i))
                        {
                                var fieldValue = getFieldValue(currentNode);
                                
                                if (jQuery(currentNode).is("select") && currentNode.multiple){
                            		var nameParts = jQuery(currentNode).attr("name").split(".");
                            		name = nameParts.length>1?nameParts[nameParts.length-2]:nameParts[0];
                            	}else{
                            		name = jQuery(currentNode).attr("name");
                            	}
                                if (fieldValue !== null){
                               		result.push({ name: name, value: fieldValue});
                                }
                        }
                        else
                        {
                                var subresult = getFormValues(currentNode);
                                result = result.concat(subresult);
                        }

                        currentNode = currentNode.nextSibling;
                }

                return result;
        }

        function getFieldValue(fieldNode)
        {
        		var ruptype = jQuery(fieldNode).attr("ruptype");
        		if (ruptype){
        			return jQuery(fieldNode)["rup_"+ruptype]("getRupValue");
        		}else{
	                switch (fieldNode.nodeName) {
	                		case 'HIDDEN':
	                        case 'INPUT':
	                        case 'TEXTAREA':
	                                switch (fieldNode.type.toLowerCase()) {
	                                        case 'radio':
	                                        case 'checkbox':
	                                                if (fieldNode.checked) return fieldNode.value;
	                                                break;
	
	                                        case 'button':
	                                        case 'reset':
	                                        case 'submit':
	                                        case 'image':
	                                                return '';
	                                                break;
	
	                                        default:
	                                                return fieldNode.value;
	                                                break;
	                                }
	                                break;
	
	                        case 'SELECT':
	                                return getSelectedOptionValue(fieldNode);
	                                break;
	
	                        default:
	                                break;
	                }
        		}

                return null;
        }

        function getSelectedOptionValue(selectNode)
        {
                var multiple = selectNode.multiple;
                if (!multiple) return selectNode.value;

                var result = [];
                for (var options = selectNode.getElementsByTagName("option"), i = 0, l = options.length; i < l; i++)
                {
                		var nameParts = selectNode.name.split(".");
                		nameParts[nameParts.length-1];
//                        if (options[i].selected) result.push(options[i].value);
                		if (options[i].selected){
                			var jsonObj = {};
                			jsonObj[nameParts[nameParts.length-1]] = options[i].value;
                			result.push(jsonObj);
                		}
                }

                return result;
        }

        /**
         * @deprecated Use form2object() instead
         * @param rootNode
         * @param delimiter
         */
        window.form2json = window.form2object;

})();
