var gHrefRecommender="http://recommender.bibtip.de/service/bibtip4.php";

init_bibtip();

function init_bibtip()
{
  var isxn=getBibtipISXN();
  var shortTitle=getBibtipShortTitle();
  var nd=getBibtipNd();

  checkForRecs(isxn,shortTitle,nd);
}



function getBibtipShortTitle(){
	var element = document.getElementById('bibtip_shorttitle');
    if (element) {
        return getContent(element);
    }
	return "";
}

function getContent(element)
{
  var text_concat = '';

  if(element.nodeType==3) {
    // text node
    str = element.data
    return str;
  }
  else {
    // element node
    var children=element.childNodes;
    var numChildren=children.length;
    for(var i=0;i<children.length;i++) {
        text_chunk = getContent(children[i]);
        if (text_chunk.length > 0) {
            text_concat = text_concat + text_chunk;
        }
    }
  }

  return text_concat;
}


function getBibtipISXN(){
	var element = document.getElementById('bibtip_isxn');
    if (element) {
        if (element.lastChild) {
            if (element.lastChild.nodeValue) {
                return element.lastChild.nodeValue;
            }
        }
    }
	return "";
}

function getBibtipNd(){
	var element = document.getElementById('bibtip_id');
    if (element) {
        if (element.lastChild) {
            if (element.lastChild.nodeValue) {
                return element.lastChild.nodeValue;
            }
        }
    }
	return "";
};


function getFbt(){
    var result = document.URL.match(/&fbt=[0-9]{7}/);
    if (result != null) {
        return result[0];
    }
    return "";
};



function checkForRecs(isxn,shortTitle,nd)
{
     
  var catalog='ub_bt';

  var params="?isxns="+isxn+"&catalog="+catalog;
  params+="&title="+encodeURIComponent(shortTitle);
  params+="&nd="+nd;
  //params+="&test=";
  params +=getFbt();
  params+="&url="+encodeURIComponent(document.URL);
  params+="&referer="+encodeURIComponent(document.referrer);
  if (nd.length > 3) {
    insertScriptSrc(gHrefRecommender+params);
  }
     
}



function insertScriptSrc(src)
{
  var scriptElement=document.createElement("script");
  scriptElement.setAttribute("src",src);
  var bodyElement=document.getElementsByTagName("body")[0];
  bodyElement.appendChild(scriptElement);
  setTimeout("checkResponse()",5000);
}



function showCompleteList()
{
    document.getElementById('short_list').style.display = 'none';
    document.getElementById('long_list').style.display = 'block';
    document.getElementById('more_button').style.display = 'none';
}

function showRecs(recs)
{
  if(recs.length > 0) {
      var recDiv = document.getElementById("bibtip_reclist");
      if (recDiv) {
          var newHeader = createHeader();
          recDiv.appendChild(newHeader);
          var LIST_LENGTH = 15;

          var shortList = createList(recs,'short_list',LIST_LENGTH);
          var longList = createList(recs,'long_list',100);
          longList.style.display='none';
          recDiv.appendChild(shortList);
          recDiv.appendChild(longList);

          if (recs.length > LIST_LENGTH) {
            var newButton = document.createElement("div");
            newButton.setAttribute('id','more_button');
            var newAnchor = document.createElement("a");
            newAnchor.setAttribute("href","javascript:showCompleteList()");
            newAnchor.appendChild(document.createTextNode('mehr ...'));
            newButton.appendChild(newAnchor);
            recDiv.appendChild(newButton);
          }
          recDiv.style.display='block';
      }

  }

}

function createHeader() 
{
      var newHeader = document.createElement("div");
      newHeader.setAttribute('id','bibtip_header');
      var newImage=document.createElement("img");
      newImage.setAttribute("src",'http://recommender.bibtip.de/service/Bibtip_Logo_Final_ohne_Subt_52x16.gif');
      newImage.setAttribute("border",'0');
      var newAnchor = document.createElement("a");
      newAnchor.setAttribute("href","http://www.bibtip.com");
      newAnchor.setAttribute("target","blank");
      newAnchor.appendChild(newImage);
      newHeader.appendChild(newAnchor);
      var newTitle = document.createElement("span");
      newTitle.setAttribute('id','bibtip_title');
      newTitle.appendChild(document.createTextNode(' Was vielleicht auch interessant ist ...'));
      newHeader.appendChild(newTitle);
      return newHeader;
}

function createList(recs,id,lengthLimit) 
{
      var newDiv= document.createElement("div");
      newDiv.setAttribute("id",id);
      var newList = document.createElement("ul");
      newDiv.appendChild(newList);

      for (var i = 0; (i < recs.length) && (i < lengthLimit); i++) {
          var newLi = document.createElement("li");
          var newAnchor = document.createElement("a");
          var entry = recs[i];
          newAnchor.setAttribute("href",entry[1]);
          newAnchor.appendChild(document.createTextNode(entry[0]));
          newLi.appendChild(newAnchor);
          newList.appendChild(newLi);
      }
      
      return newDiv;
}




function checkResponse()
{
  if (!document.getElementById('bibtip_header')) {
    //window.stop();
  }

}