/* globals Bloodhound */   // typeahead.js

/* exported Autocomplete */
var Autocomplete = (function() {

    var autocomplete;

    var init = function() {
        autocomplete = new Bloodhound({
            datumTokenizer: Bloodhound.tokenizers.whitespace,
            queryTokenizer: Bloodhound.tokenizers.whitespace,
            remote: {
                url: "autocomplete.json?term=%QUERY",
                wildcard: "%QUERY",
                rateLimitBy: "throttle",
                rateLimitWait: 300
            },
            sufficient: 12
        });
    };

    var reset = function() {
        autocomplete.clear();
    };

    var getAutocomplete = function() {
        return autocomplete;
    };

    // this is used to generate quick filters for label modal
    var generateHints = function(label_key, label_val) {
      var hints = [];
      if (label_key == "@silenced") {
        // static list of hints for @silenced label
        hints.push("@silenced=true");
        hints.push("@silenced=false");
      } else if (label_key == "@inhibited") {
        // static list of hints for @inhibited label
        hints.push("@inhibited=true");
        hints.push("@inhibited=false");
      } else {
        // equal and non-equal hints for everything else
        hints.push(label_key + "=" + label_val);
        hints.push(label_key + "!=" + label_val);

        // if there's space in the label generate regexp hints for partials
        if (label_val.toString().indexOf(" ") >= 0) {
          $.each(label_val.toString().split(" "), function(l, label_part){
              hints.push(label_key + "=~" + label_part);
              hints.push(label_key + "!~" + label_part);
          });
        }

        // if value is an int generate  less / more hints
        if ($.isNumeric(label_val)) {
          var valAsNumber = parseInt(label_val);
          if (!isNaN(valAsNumber)) {
            hints.push(label_key + ">" + label_val);
            hints.push(label_key + "<" + label_val);
          }
        }
      }
      return hints;
    };

    return {
        Init: init,
        Reset: reset,
        Autocomplete: getAutocomplete,
        GenerateHints: generateHints
    };

}());