/* http://www.kryogenix.org/code/browser/searchhi/ */
/* Modified 20021006 to fix query string parsing and add case insensitivity */
/* Modified 20070316 to stop highlighting inside nosearchhi nodes */
function highlightWord(node,word) {
	// Iterate into this nodes childNodes
	if (node.hasChildNodes) {
		var hi_cn;
		for (hi_cn=0;hi_cn<node.childNodes.length;hi_cn++) {
			highlightWord(node.childNodes[hi_cn],word);
		}
	}
	
	// And do this node itself
	if (node.nodeType == 3) { // text node
		tempNodeVal = node.nodeValue.toLowerCase();
		tempWordVal = word.toLowerCase();
		if (tempNodeVal.indexOf(tempWordVal) != -1) {
			pn = node.parentNode;
			// check if we're inside a "nosearchhi" zone
			checkn = pn;
			while (checkn.nodeType != 9 && 
			checkn.nodeName.toLowerCase() != 'body') { 
			// 9 = top of doc
				if (checkn.className.match(/\bnosearchhi\b/)) { return; }
				checkn = checkn.parentNode;
			}
			if (pn.className != "searchword") {
				// word has not already been highlighted!
				nv = node.nodeValue;
				ni = tempNodeVal.indexOf(tempWordVal);
				// Create a load of replacement nodes
				before = document.createTextNode(nv.substr(0,ni));
				docWordVal = nv.substr(ni,word.length);
				after = document.createTextNode(nv.substr(ni+word.length));
				hiwordtext = document.createTextNode(docWordVal);
				hiword = document.createElement("span");
				hiword.className = "searchword";
				hiword.appendChild(hiwordtext);
				pn.insertBefore(before,node);
				pn.insertBefore(hiword,node);
				pn.insertBefore(after,node);
				pn.removeChild(node);
			}
		}
	}
}

function getSearchCookie() {
  var allCookies = document.cookie;
  var pos = allCookies.indexOf('fsq=');
  
  if (pos == -1) {
    return null;
  } else {
    var start = pos + 4;
    var end = allCookies.indexOf(';', start);
    if (end == -1) end = allCookies.length;
    var value = allCookies.substring(start, end);
    value = decodeURIComponent(value);
    return value;
  }
}

function searchHighlightNode(node, q) {
  if (q != null) {
    var words = q.split(/\s+/);
    for (var w=0;w<words.length;w++) {
      highlightWord(node, words[w]);
    }
  }
}

function searchHighlightBody(q) {
  searchHighlightNode(document.getElementsByTagName("body")[0], q);
}


function googleSearchHighlight() {
	if (!document.createElement) return;
	ref = document.referrer;
  
  var searchTerm = null;
  
  if (ref.search(/\/go\/collections\/online\/?(?:\?.+)?/) != -1
   || ref.search(/\/go\/about\/memory-book\/view\/?(?:\?.+)?/) != -1
   || ref.search(/\/go\/collections\/oral-histories\/interviews-by-topic\/?(?:\?.+)?/) != -1) {
    var cookieValue = getSearchCookie();
    if (cookieValue != null) {
      //search term present in cookie AND we came from ajax search page
      searchTerm = cookieValue;
    }
  }
  
  if (searchTerm == null) {
	  if (ref.indexOf('?') == -1) return;
	  qs = ref.substr(ref.indexOf('?')+1);
	  qsa = qs.split('&');
    
    for (i=0;i<qsa.length;i++) {
      qsip = qsa[i].split('=');
      if (qsip.length == 1) {
        continue;
      }
      
      if (qsip[0] == 'q' || qsip[0] == 'p') { // q= for Google, p= for Yahoo
        searchTerm = unescape(qsip[1].replace(/\+/g,' '));
      }
    }
  }
  
  searchHighlightBody(searchTerm);
  
}

var searchhiInitialOnloaded = false;

var searchhiOldOnload = window.onload;
window.onload = function() {
  if (!searchhiInitialOnloaded) {
    searchhiInitialOnloaded = true;
    googleSearchHighlight();
  }
  
  if (searchhiOldOnload) {
    searchhiOldOnload();
  }
};