/*
Written by: Adam Crownoble (adam@bryan.edu)
Date: April 3 2006
License: LGPL (http://www.gnu.org/copyleft/lesser.html)
*/

var LiveSearch = Class.create();
LiveSearch.prototype = {

 initialize: function(searchBox, results) {

  this.form = searchBox.form;
  this.searchBox = searchBox;
  this.results = results;
  this.url = this.form.action;
  this.method = this.form.method;
  this.stopSubmit = true;
  this.searchString = this.searchBox.value;
  this.starterText = this.searchString;
  this.searchingMessage = 'Searching...';
  this.minLength = 3;
  this.timeoutID = 0;
  this.delay = 500;
  
  Event.observe(this.form, 'submit', this.submit.bind(this));
  Event.observe(this.searchBox, 'keyup', this.update.bind(this));
  Event.observe(this.searchBox, 'focus', this.handleStarterText.bind(this));
  Event.observe(this.searchBox, 'blur', this.handleStarterText.bind(this));

  this.form.reset();

 },

 handleStarterText: function(event) {

  switch(event.type) {
   case 'focus':
    if(this.searchBox.value == this.starterText) {
     Field.clear(this.searchBox);
    }
    break;
   
   case 'blur':
    if(this.searchBox.value == '') {
     this.searchBox.value = this.starterText;
    }
    break;

  }
  
 },

 update: function() {

  if(this.searchString != this.searchBox.value && this.searchBox.value != this.starterText) {

   this.searchString = this.searchBox.value;
   clearTimeout(this.timeoutID);
   
   if(this.searchString.length >= this.minLength) {
    this.results.innerHTML = this.searchingMessage;
    this.timeoutID = setTimeout(this.search.bind(this), this.delay);
   } else {
    this.results.innerHTML = '';
   }
   
  }
  
 },

 search: function() {
  var parameters = Form.serialize(this.form);
  var ajax = new Ajax.Updater(this.results, this.url, { method: this.method, parameters: parameters });
 },

 submit: function(event) {
  if(this.stopSubmit) { Event.stop(event); }
 }

};