/**

 * First created between November and December 2003

 *

 * 1994-2003 Digitalis Informatica. All rights reserved.

 * 

 * Distribuicao e Gestao de Informatica, Lda.

 * Estrada de Paco de Arcos num.9 - Piso -1

 * 2780-666 Paco de Arcos

 * Telefone: (351) 21 4408990

 * Fax: (351) 21 4408999

 * http://www.digitalis.pt 

 * 

 *

 * @author Daniel Alexandre Campelo <dcampelo@digitalis.pt>

 * Created : 27/May/2005

 *

 *

 * Class that generats a form dinamicly  and submits the request.

 *

 * NOTE : This JS file is automaticly added to the page by the dif:document tag.

 *

 *

 * Contructors

 *    DIFForm(<baseURL>) -> Constructor(1), receives the base URL.

 *                          The base URL may contain the query string of the request, in that case the query must be processed and taken in account.

 *

 * Methods 

 *    addParameter(<key>, <value>) -> adds a new parameter to be send on the request

 *    addQuery(<query>) -> adds a set of parameters to be sent in the request.

 *                         The format of the 'String' must be '?<name>=<value>&<name>=<value>&'

 *    submit() -> Submits the form. Responsable for generating theform dinamicly.

 *    setMethod(<methodName>) -> Sets the method to be used for the form.

 *    <String> stripURLOfQuery(<String>) -> Removes the query string from a URL.

 */



var VALUE_INDEX = 1;

var KEY_INDEX   = 0;



/**

 * Contructor.

 * Checks if the baseURL defines a query. If so, adds the parameters to the form request and strips it out from the URL

 */

function DIFForm( baseURL){

	// Attributes

	this.baseURL = baseURL;

	this.parameters = new Array();

	this.method = 'POST';



	// Methods	

	this.addParameter = addDIFFormParameter;

	this.addQuery = addDIFFormQuery;

	this.setMethod = setDIFFormMethod;

	this.submit = submitDIFForm;

	this.debug = debugDIFForm;

	this.removeQueryFromURL = stripURLOfQuery;



	// Checks if the baseURL has a query defined

	this.addQuery( this.baseURL);

	this.baseURL = this.removeQueryFromURL( this.baseURL);

}



/**

 * Adds a parameter to the parameter list

 */

function addDIFFormParameter(key, value){

	this.parameters[ this.parameters.length] = [key, value];

}



/**

 * Adds the parameters from a query string into the parameter list.

 */

function addDIFFormQuery( query){	

	var QUERY_SPLITER = "&|\\?";

	var NAME_VALUE_SPLIT = "=";



	var regExpQuery = new RegExp( QUERY_SPLITER);

	var u;  



	// Splits the query string

  var paramMatchs = query.split( regExpQuery);



  // Checks if there was any match

  if (paramMatchs != null) {

		var regExpAttrib = new RegExp( NAME_VALUE_SPLIT, "g");



  	// Runs over all matchs (over the query)

    for (i = 0; i < paramMatchs.length; i++) {

			try{

	    	// Gets the key and the value

	 			var attribMatchs = paramMatchs[i].split( regExpAttrib);

				// Adds the parameter to the list

				var value = attribMatchs[ 1];

				if (value==u || value == 'undefined'){

					value = '';

				}

	 			this.addParameter( attribMatchs[ 0], value);

	 		} catch(err){

	 			 // Traps any error ocurred due to the regular expression

	 		}

    }

  }

	// Get each of the parameters and add it to the list

}



/**

 * Set the submit method.

 * Only accepts "POST" and "GET"

 */

function setDIFFormMethod( method){

	var methAux = method.toLowerCase();

	if( methAux=='post' || methAux == 'get'){

		this.method = method;

	}

}



/**

 * Generats the form and submits it

 */

function submitDIFForm(){
	// Write the form element
	var myform=document.createElement("form");
	myform.name = 'difformform';
	myform.id = 'difformform';
	myform.method = this.method;
	myform.action = this.baseURL;

	var i = 0;

	// write all parameters
	for( ; i<this.parameters.length ; i++){
		var myInput = document.createElement("input");
		myInput.type = "hidden";
		myInput.name = this.parameters[i][KEY_INDEX];
		myInput.value = this.parameters[i][VALUE_INDEX];
		myform.appendChild(myInput);
	}

	document.body.appendChild(myform);
	// getting and submiting the form
	myform.submit();
}



function debugDIFForm(){



	// Write the form element

	var str = "<form name='difformform' id='difformform' method='"+this.method+"' action='"+this.baseURL+"'>";



	var i = 0;

	// write all parameters

	for( ; i<this.parameters.length ; i++){

		str = str+"<input type='hidden' name='"+this.parameters[i][KEY_INDEX]+"' value='"+this.parameters[i][VALUE_INDEX]+"'/>";

	}



	// write end form

	str = str+"</form>";



	alert(str);

}



function stripURLOfQuery( url){

	var regExp = new RegExp( ".[^\\?]*");

	// Splits the query string

  return regExp.exec( url)[0];

}