/**
 * 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.
 *
 * @author Maxim Vasiliev
 * 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 '.'
         */
        window.form2object = function(rootNode, delimiter)
        {
                rootNode = typeof rootNode == 'string' ? document.getElementById(rootNode) : rootNode;
                delimiter = delimiter || '.';
                var formValues = getFormValues(rootNode);
                var result = {};
                var arrays = {};

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

                        var name = formValues[i].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 = [];
                var currentNode = rootNode.firstChild;

                while (currentNode)
                {
                        if (currentNode.nodeName.match(/INPUT|SELECT|TEXTAREA|FIELDSET/i))
                        {
                        	
                                result.push({ name: currentNode.name, value: getFieldValue(currentNode)});
                        }
                        else
                        {
                                var subresult = getFormValues(currentNode);
                                result = result.concat(subresult);
                        }

                        currentNode = currentNode.nextSibling;
                }

                return result;
        }

        function getFieldValue(fieldNode)
        {
        	
                if (fieldNode.nodeName == 'INPUT')
                {
                        if (fieldNode.type.toLowerCase() == 'radio' || fieldNode.type.toLowerCase() == 'checkbox')
                        {
                               
                            return fieldNode.checked;
                                
                        }
                        else
                        {
                                if (!fieldNode.type.toLowerCase().match(/button|reset|submit|image/i))
                                {
                                        return getFormattedOptionValue(fieldNode.value);
                                }
                        }
                }
                else
                {
                        if (fieldNode.nodeName == 'TEXTAREA')
                        {
                                return getFormattedOptionValue(fieldNode.innerHTML);
                        }
                        else
                        {
                                if (fieldNode.nodeName == 'SELECT')
                                {
                                        return getFormattedOptionValue(getSelectedOptionValue(fieldNode));
                                }
                        }
                }

                return '';
        }
        
        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++)
                {
                        if (options[i].selected) result.push(options[i].value);
                }

                return result;
        }
        /**
         * 
         * Function added by Dmitry Semenov
         */
        function getFormattedOptionValue(value) {
        	if(value == "true") {
        		return true;
        	} else if(value == "false") {
        		return false;
        	} else if(!isNaN(value)) {
        		return parseFloat(value);
        	} else {
        		return value;
        	}
        }
        
        /**
         * @deprecated Use form2object() instead
         * @param rootNode
         * @param delimiter
         */
        window.form2json = window.form2object;

})();