cambrient.fragments = {}; // cache for fragments

// private function to set fragments
cambrient._setFragment = function(element, fragment, chainFunction, appendFragment) {
    // unescape text areas
   fragment = fragment.replace(/text_area/gi, "textarea");

   if (element != null) {
      if (appendFragment) element.innerHTML += fragment;
      else element.innerHTML = fragment;
   }
   
   if (chainFunction != null && isFunction(chainFunction)) {
      if (element == null) chainFunction(fragment);
      else chainFunction(element, fragment); 
   }
}

/**
 * Load a fragment using Ajax. A chainFunction can be passed, which will get called after the fragment loads successfully.
 * The fragments must be stored in a "/fragments" sub-directory
 */
cambrient.loadFragment = function(elementId, fragment, chainFunction, appendFragment) {
   var element = null;
   if (!isObject(elementId)) {
      element = document.getElementById(elementId);
   }

   if (cambrient.fragments[fragment] == null) {
      cambrient.ajax.request(
         fragment + '.html',  
         function(reply) {
            cambrient.fragments[fragment] = reply.responseText;
            cambrient._setFragment(element, cambrient.fragments[fragment], chainFunction, appendFragment);
         }
      );
   } else {
      cambrient._setFragment(element, cambrient.fragments[fragment], chainFunction, appendFragment);
   }

}

// Loads a fragment into a variable rather than an element
cambrient.loadFragmentVar = function(fragment, chainFunction, appendFragment) {
    return cambrient.loadFragment(null, fragment, chainFunction, appendFragment);
}

/**
 * Append a fragment using Ajax. A chainFunction can be passed, which will get called after the fragment loads successfully.
 * The fragments must be stored in a "/fragments" sub-directory
 */
cambrient.appendFragment = function(elementId, fragment, chainFunction){
   cambrient.loadFragment(elementId, fragment, chainFunction, true);
}

/**
 * Takes a string template and processes it using the provided data, with the Trimpath Template engine.
 */
cambrient.processTemplate = function(templateString, data) {
   try {
      var tpl = TrimPath.parseTemplate(templateString);
      return tpl.process(data);
   } catch (e) {
      cambrient.userMessaging.error(e);
   }
}

/**
 * Converts the ajax reply to a data object, and checks for errors.
 * @param {Object} ajaxReply
 */
cambrient.getData = function(ajaxReply) {
   try {
      var data = ajaxReply.responseText.evalJSON() ;
      if (data.error) {
         throw data.message;
      }
      
      return data;
   } catch (e) {
      cambrient.userMessaging.error(e);
   }
   
   return null;
}

cambrient.unescapeHTML = function(html) {
    if (navigator.userAgent.toLowerCase().indexOf("chrome") == -1) {
        var htmlNode = document.createElement("DIV");
        htmlNode.innerHTML = html;
        if (htmlNode.innerText) return htmlNode.innerText; // IE
        return htmlNode.textContent;
        // FF
    } else {
        return html;
        //Chrome
    }
}