/*
 * This autocompleter should be constructed with a given populator function.
 * The populator function should call the setChoices(choices) method on this autocompleter
 * where 'choices' is the array of choices to be displayed in the autocomplete div.
 */
Autocompleter.DWR = Class.create();
Autocompleter.DWR.prototype = Object.extend(new Autocompleter.Base(), {
  initialize: function(element, update, populator, options) {
    this.baseInitialize(element, update, options);
    this.options.array = new Array(0);
    this.populator = populator;
  },

  // called by the autocompleter on an event.
  getUpdatedChoices: function() {
    this.populator(this, this.getToken()); // this is the populator specified in the constructor.
  },

  // should be called by the populator (specified in the constructor)
  setChoices: function(array) {
    this.options.array = array;
    this.updateChoices(this.options.selector(this));
  },

  setOptions: function(options) {
    this.options = Object.extend({
      choices: 1000000,
      partialSearch: true,
      partialChars: 3,
      ignoreCase: true,
      fullSearch: false,
      selector: function(instance) {
        var ret       = []; // Beginning matches
        var partial   = []; // Inside matches
        var entry     = instance.getToken();
        var count     = 0;

        for (var i = 0; i < instance.options.array.length &&
          ret.length < instance.options.choices ; i++) {
          
          var city = instance.options.array[i];
          var elem = "";          
          
          var code = city.code;
          var name = city.name;
          var isIata = city.isIATA;
          var iata = city.IATA;
          var country = city.country.name;
          
          if (isIata=='1')
          	elem = name+" ("+iata+")";
          else
          	elem = name;
          	
          if (country!='')
          	elem+=", "+country;
		
          var foundPos = instance.options.ignoreCase ?
            elem.toLowerCase().indexOf(entry.toLowerCase()) :
            elem.indexOf(entry);

          while (foundPos != -1) {
          	var id = name+"$"+isIata+"$"+iata+"$"+code;
          	
            if (foundPos == 0 && elem.length != entry.length) {                           
              ret.push("<li id=\""+id+"\"><strong>" + elem.substr(0, entry.length) + "</strong>" +
                elem.substr(entry.length) + "</li>");
              break;
            } else if (entry.length >= instance.options.partialChars &&
              instance.options.partialSearch && foundPos != -1) {
              if (instance.options.fullSearch || /\s/.test(elem.substr(foundPos-1,1))) {
                partial.push("<li id='"+id+"'>" + elem.substr(0, foundPos) + "<strong>" +
                  elem.substr(foundPos, entry.length) + "</strong>" + elem.substr(
                  foundPos + entry.length) + "</li>");
                break;
              }
            }

            foundPos = instance.options.ignoreCase ?
              elem.toLowerCase().indexOf(entry.toLowerCase(), foundPos + 1) :
              elem.indexOf(entry, foundPos + 1);

          }
        }
        if (partial.length)
          ret = ret.concat(partial.slice(0, instance.options.choices - ret.length))
        return "<ul>" + ret.join('') + "</ul>";
      }
    }, options || {});
  }
});