/*
 * NeoAjax - NeoBiz Asynchronous JavaScript And XML
 * Marcio Ghiraldelli / André Cupini
 * 20/04/2006
 */
var debug=0;
var banner=1;

// Tenta criar objeto xmlHTTP
try {
  xmlhttp = new XMLHttpRequest();
} catch(e) {
  try {
    xmlhttp = new ActiveXObject("Msxml2.XMLHTTP");
  } catch(e) {
    try {
      xmlhttp = new ActiveXObject("Microsoft.XMLHTTP");
    } catch(e) {
      xmlhttp = false;
    }
  }
}

// Pilha de conexões
pilha=[];
ipilha=0;


function ajaxSendRequest(idObj, url, form, newStyle) {
	banner = 0 ;
  if (debug > 0)
	  alert("ajaxSendRequest('" + idObj + "', '" + url + "', '" + form + "', '"+ newStyle + "')");

  // DivLoading
  if (document.getElementById('divLoading')) {
	  document.getElementById('divLoading').style.display = 'block';
	  document.getElementById('divLoading').innerHTML = '<b>Carregando, aguarde...</b><br><img src="/imagens/loading.gif" />';
  }

  // Adiciona variavel randomica para matar o cache do navegador
  if (url != null) {
	  var delimiter;
	  if (url.indexOf("?") > 0) {
	    delimiter = "&";
	  } else {
	    delimiter = "?";
	  }
	  url = url + delimiter + "rand=" + Math.floor(Math.random()*9999);
  }

  // Empilha
  if (debug > 0)
	  alert("Empilhando " + idObj + ", " + url + ", " + form + ", " + newStyle);
  pilha[pilha.length] = [idObj, url, form, newStyle];

  // Se não há conexões pendentes, executa
  if ( (ipilha + 1) == pilha.length)
    ajaxRun();

}


function ajaxRun(){

  // Recupera dados da pilha
  var idObj = pilha[ipilha][0];
  var url = pilha[ipilha][1];
  var form = pilha[ipilha][2];
  var newStyle = pilha[ipilha][3];

  // Opta pelo método
  var method = "GET";
  if (form != null) {
    method = "POST";
  }

  if (url != null) {
	  // Se veio a URL, faz requisicao e so desempilha no retorno
	  xmlhttp.open(method, url, true);

	  // Se veio o form, manda os dados por POST, multipar/form-data
	  var formData = "";
	  var boundary;
	  if (form != null) {
		boundary = "---------------------------"+ Math.floor(Math.random()*99999999999999);
		formData = generateMultiPart(form, boundary);
		xmlhttp.setRequestHeader('Content-Type', 'multipart/form-data; boundary=' + boundary);
	  }
	  xmlhttp.send(formData);

  } else {
	  // Se a URL veio null, so muda o
	  // CSS se passado no ajaxSendRequest
	  if (newStyle != null)
	      document.getElementById(idObj).className = newStyle;
	  if (debug > 0)
		  alert("URL nula, apenas alterando CSS da div " + idObj + " para: " + newStyle);
      // Desempilhando
      ipilha++
      if (ipilha < pilha.length) {
        setTimeout('ajaxRun()', 20);
      }
  }

  // Tratamento do retorno
  xmlhttp.onreadystatechange = function() {
    if (xmlhttp.readyState == 4){
	  if (document.getElementById('divLoading'))
	      document.getElementById('divLoading').style.display = 'none';
	  // CSS se passado no ajaxSendRequest
	  if (newStyle != null)
	      document.getElementById(idObj).className = newStyle;
      // Mostra o HTML recebido
      retorno=unescape(xmlhttp.responseText.replace(/\+/g, " "));
      window.scrollTo(0, 0);
      document.getElementById(idObj).innerHTML = retorno;
      // Desempilhando
      ipilha++
      if (ipilha < pilha.length) {
        setTimeout('ajaxRun()',20);
      }
    }
  }
}


// Gera multipart/form-data dos dados do formulário, conforme RFC 2388
// RFC 2388 --> http://www.faqs.org/rfcs/rfc2388.html
function generateMultiPart(theForm, boundary) {

  var formData = "";
  var cDisposition = 'Content-Disposition: form-data; name="';
  // Percorre todos os elementos do formulário
  for(i = 0; i < theForm.elements.length; i++){

    if (theForm.elements[i].name) {

	  if (
		  theForm.elements[i].type == "text" ||
		  theForm.elements[i].type == "textarea" ||
		  theForm.elements[i].type == "button" ||
		  theForm.elements[i].type == "hidden"
	  ) {
          formData += '--' + boundary + '\r\n';
          formData += cDisposition + theForm.elements[i].name +'"\r\n\r\n';
          formData += theForm.elements[i].value + "\r\n";
	  }

	  if (theForm.elements[i].type == "select-one") {
          formData += '--' + boundary + '\r\n';
          formData += cDisposition + theForm.elements[i].name +'"\r\n\r\n';
          formData += theForm.elements[i].options[theForm.elements[i].selectedIndex].value + "\r\n";
	  }

	  if (theForm.elements[i].type == "radio") {
          if (theForm.elements[i].checked == true) {
            formData += '--' + boundary + '\r\n';
            formData += cDisposition + theForm.elements[i].name +'"\r\n\r\n';
            formData += theForm.elements[i].value + "\r\n";
          }
	  }

	  if (theForm.elements[i].type == "select-multiple") {
          for  (j = 0; j < theForm.elements[i].length; j++) {
            if (theForm.elements[i][j].selected) {
              formData += '--' + boundary + '\r\n';
              formData += cDisposition + theForm.elements[i].name +'"\r\n\r\n';
              formData += theForm.elements[i][j].value + "\r\n";
            }
          }
	  }

	  if (theForm.elements[i].type == "checkbox") {
          if (theForm.elements[i].checked) {
            formData += '--' + boundary + '\r\n';
            formData += cDisposition + theForm.elements[i].name +'"\r\n\r\n';
            formData += theForm.elements[i].value + "\r\n";
          }
	  }
    }
  }
  formData += "--" + boundary + "--\r\n";
  return formData;
}


function initAjax() {
	// Inicializacao automatica
	var divConteudo = "conteudo";
	var query=this.location.search.substring(1);
	if (query.length > 0){
		var params=query.substring(query.indexOf("=") + 1);
		var url = divConteudo + ".php?pagina=" + params;
		ajaxSendRequest(divConteudo, url, null);
	} else
		ajaxSendRequest(divConteudo, 'principal.htm', null);
}