/**
Author: Jhan Mateo
Date Started: 7/29/2015
Date Ended: 7/30/2015
Description: Using native javascript (no js framework), this application will serializes from form data to Json format.
The MIT License (MIT)

Copyright (c) 2015 Jhan Mateo

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.
**/

'use strict';

function formToJson(form){

	if('form'!==form.nodeName.toLowerCase() && 1!==form.nodeType){
		console.log('Form error');
		return false;
	}

	var json_data = {}, new_arr_obj=null, index=null, key=null, input_name=null, new_obj=null;

	for(var i=0,n=form.length; i<n; i++){

		if(form[i].type!=='submit' || form[i].nodeName.toLowerCase()!=='fieldset' || form[i].nodeName.toLowerCase()!=='reset'){

			if(
				(form[i]!==undefined && form[i]!==null) &&
				(form[i].type==='checkbox' && form[i].checked) ||
				(form[i].type==='radio' && form[i].checked) ||
				(form[i].type==='text' && form[i].value.length>0) ||
				(form[i].type==='range' && form[i].value.length>0) ||
				(form[i].type==='select-one' && form[i].options[form[i].selectedIndex].value.length>0) ||
				(form[i].type==='select-multiple' && form[i].selectedOptions.length>0) ||
				(form[i].type==='textarea' && form[i].value.length>0) ||
				(form[i].type==='number' && form[i].value.length>0) ||
				(form[i].type==='date' && form[i].value.length>0) ||
				(form[i].type==='color' && form[i].value.length>0) ||
				(form[i].type==='month' && form[i].value.length>0) ||
				(form[i].type==='week' && form[i].value.length>0) ||
				(form[i].type==='time' && form[i].value.length>0) ||
				(form[i].type==='datetime' && form[i].value.length>0) ||
				(form[i].type==='datetime-local' && form[i].value.length>0) ||
				(form[i].type==='email' && form[i].value.length>0) ||
				(form[i].type==='search' && form[i].value.length>0) ||
				(form[i].type==='tel' && form[i].value.length>0) ||
				(form[i].type==='url' && form[i].value.length>0) ||
				(form[i].type==='image' && form[i].value.length>0) ||
				(form[i].type==='file' && form[i].value.length>0)
			){

				/*get the name of the current input*/
				input_name = form[i].name;

				/*array/object*/
				if(input_name.match(/\[.*\]/g)){

					if(input_name.match(/\[.+\]/g)){

						/*array object,  Object[][name]*/
						if(input_name.match(/\[.+\]/g)[0].match(/\[[0-9]\]/)!==null){

							new_arr_obj = input_name.replace(/\[.+\]/g,''); //get object name
							index = input_name.match(/[0-9]/g)[0]; //get index group
							key = input_name.match(/\[.+\]/g)[0].replace(/(\[|\]|[0-9])/g,'');

							/*create an array in an object*/
							if(typeof json_data[new_arr_obj]==='undefined'){
							 	json_data[new_arr_obj] = [];
							}

							/*create an object inside array*/
							if(typeof json_data[new_arr_obj][index]==='undefined'){
								json_data[new_arr_obj][index] = {};
							}

							json_data[new_arr_obj][index][key] = form[i].value;

						}else if(input_name.match(/\[.+\]/g)!==null){
							//to object
							//Object[name]

							/*get object name*/
							new_obj = input_name.replace(/\[.+\]/g,'');

							/*set new object*/
							if(typeof json_data[new_obj]==='undefined'){
								json_data[new_obj] = {};
							}
							/*assign a key name*/
							key = input_name.match(/\[.+\]/g)[0].replace(/(\[|\])/g,'');

							/*set key and form value*/
							json_data[new_obj][key] = form[i].value;
						}else{}
					}else{

						/*to array, Object[]*/
						key = input_name.replace(/\[.*\]/g, '');

						if(form[i].type==='select-multiple'){
							for(var j=0, m=form[i].selectedOptions.length; j<m; j++){
								if(form[i].selectedOptions[j].value.length>0){
									if(typeof json_data[key]==='undefined'){
										json_data[key] = [];
									}
									json_data[key].push(form[i].selectedOptions[j].value);
								}
							}

						}else{
							if(typeof json_data[key]==='undefined'){
								json_data[key] = [];
							}
							json_data[key].push(form[i].value);
						}

					}
				}else{
					/*basic info*/
					key = form[i].name.replace(/\[.*\]/g, '');
					json_data[key] = form[i].value;

				}
			}
		}
	}//endfor

	document.getElementById('json_result').innerHTML = JSON.stringify(json_data);
	console.log("Result: ",json_data);
	return false;
}//endfunc