/**
 * @(#)$Id: openjaw.js,v 1.1 2010/08/31 14:02:17 joseramon Exp $
 *
 * Common functions for conversation management and simple HTML GET/POST.
 */
var OpenJaw = {

  requestCounter: 0,

  /**
   * Returns the browser root window.
   * This window contains the conversation ID.
   */
  getRootWindow: function() {
    return window;
  },

  /**
   * Options the current conversation ID.
   */
  getConversationID: function() {
    var w = OpenJaw.getRootWindow();
    return w.name;
  },

  /**
   * Injects the conversation ID parameter into a URL.
   */
  getConversationURL: function(url) {
    var cid = OpenJaw.getConversationID();
    if (url.indexOf('?') == -1) {
      if (url.indexOf('#') == -1) {
	return url + '?ConversationID=' + cid;
      }
      else {
	var buf = new StringBuffer();
	var x = url.split('#');
	for (var i=0; i<x.length; i++) {
	  if (i == x.length - 1) {
	    buf.append('?ConversationID=');
	    buf.append(cid);
	    buf.append('#');
	  }
	  buf.append(x[i]);
	}
	return buf.toString();
      }
    }
    else {
      if (url.indexOf('#') == -1) {
	return url + '&ConversationID=' + cid;
      }
      else {
	var buf = new StringBuffer();
	var x = url.split('#');
	for (var i=0; i<x.length; i++) {
	  if (i == x.length - 1) {
	    buf.append('&ConversationID=');
	    buf.append(cid);
	    buf.append('#');
	  }
	  buf.append(x[i]);
	}
	return buf.toString();
      }
    }
  },

  /**
   * Generates a HTTP query string (URL plus parameters) from an HTML
   * form. The query string can be used to query the server for
   * data (HTML) using the below getFromURL() function.
   */
  generateQueryString: function(form) {		
    var buf = new StringBuffer();

    buf.append(form.action);
    buf.append("?x=x");

    for (j=0; j<form.elements.length; j++) {

      var field = form.elements[j];
      var bypass = field.alt;

      if ((bypass == null) || (bypass != 'bypass')) {
	var type = field.type.toLowerCase();
	
	if ((type == "text") || (type=="hidden") || (type=="textarea") || (type=="password")) {
	  buf.append("&");
	  buf.append(field.name);
	  buf.append("=");
	  buf.append(escape(field.value));
	}
	else if (type=="checkbox") {
	  buf.append("&");
	  buf.append(field.name);
	  buf.append("=");
	  buf.append(escape(field.checked));
	}
	else if(type.substring(0,6) == "select") {
	  if (type.indexOf ("multiple") != -1) {
	    buf.append("&");
	    buf.append(field.name);
	    buf.append("=");
	    for (i =0; i < field.options.length; i++) {
	      if (field.options[i].selected == true) {
		buf.append(escape(field.options[i].value));
		buf.append("|");
	      }
	    }
	  }
	  else {
	    buf.append("&");
	    buf.append(field.name);
	    buf.append("=");
	    buf.append(escape(field.options[field.selectedIndex].value));
	  }
	}
	else if (type == "radio") {
	  if (field.checked) {
	    buf.append("&");
	    buf.append(field.name);
	    buf.append("=");
	    buf.append(escape(field.value));
	  }
	}
      }
    }
    
    return buf.toString();
  },


  /**
   * Issues an HTTP GET command.
   */
  getFromURL: function(url) {

    url = this.getConversationURL(url);

    // We add a bogus parameter to the end of the URL string to
    // ensure that the data at the given URL is reloaded (not cached).
    // The ActiveX object has no way of turning off caching.
    OpenJaw.requestCounter = OpenJaw.requestCounter + 1;

    url = url + "&RequestCounter=" + OpenJaw.requestCounter;

    var request = null;
    if (window.XMLHttpRequest) {
      request = new XMLHttpRequest();
    }
    else if (window.ActiveXObject) {
      request = new ActiveXObject("Microsoft.XMLHTTP");
    }

    if (request) {
      request.open("GET", url, false);
      request.send(null);
      if (request.status == 200) {
	//return trim(request.responseText, true, true);
	return request.responseText;
      }
      else {
	return 'Error: ' + request.status + ' ' + request.statusText;
      }
    }
    else {
      return null;
    }
  },

  /**
   * Generates an XML document from an HTML form. The XML can be
   * posted to a URL using the above postToURL() function.
   */
  generatePostXML: function(form, xml) {
    var buf = new StringBuffer();
    buf.append("<PostRequest>");

    for (j=0; j<form.elements.length; j++) {
      var field = form.elements[j];
      var type=field.type.toLowerCase();

      if ((type == "text") || (type=="hidden") || (type=="textarea")) {
	buf.append("<");
	buf.append(field.name);
	buf.append(">");
	buf.append("<![CDATA[");
	buf.append(field.value);
	buf.append("]]>");
	buf.append("</");
	buf.append(field.name);
	buf.append(">"); 
      }
      else if (type == "checkbox") {
	buf.append("<");
	buf.append(field.name);
	buf.append(">");
	buf.append(field.checked);
	buf.append("</");
	buf.append(field.name);
	buf.append(">"); 
      }
      else if (type.substring(0,6) == "select") {
	if (type.indexOf("multiple") > -1) {
	  for (i =0; i < field.options.length; i++) {
	    if (field.options[i].selected == true) {
	      buf.append("<");
	      buf.append(field.name);
	      buf.append(">");
	      buf.append("<![CDATA[");
	      buf.append(field.options[i].value);
	      buf.append("]]>");
	      buf.append("</");
	      buf.append(field.name);
	      buf.append(">"); 
	    }
	  }
	}
	else {
	  buf.append("<");
	  buf.append(field.name);
	  buf.append(">");
	  buf.append("<![CDATA[");
	  buf.append(field.options[field.selectedIndex].value);
	  buf.append("]]>");
	  buf.append("</");
	  buf.append(field.name);
	  buf.append(">"); 
	}
      }
      else if (type=="radio") {
	if (field.checked) {
	  buf.append("<");
	  buf.append(field.name);
	  buf.append(">");
	  buf.append("<![CDATA[");
	  buf.append(field.value);
	  buf.append("]]>");
	  buf.append("</");
	  buf.append(field.name);
	  buf.append(">"); 
	}
      }
    }

    if (xml != null) buf.append(xml);

    buf.append("</PostRequest>");
    return buf.toString();
  },


  /**
   * Issues an HTTP POST command.
   */
  postToURL: function(url, post, isForm) {
    url = this.getConversationURL(url);

    var request;
    if (window.XMLHttpRequest) {
      request = new XMLHttpRequest();
    }
    else if (window.ActiveXObject) {
      request = new ActiveXObject("Microsoft.XMLHTTP");
    }

    if (request) {
      request.open("POST", url, false);
      if (isForm){
	request.setRequestHeader('Content-type', 'application/x-www-form-urlencoded;charset=UTF-8');
      }
      request.send(post);
      if (request.status == 200) {
	return trim(request.responseText, true, true);
      }
      else {
	return 'Error: ' + request.status + ' ' + request.statusText;
      }
    }  			
    else {
      return null;
    }
  }

}