/* 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(labelKey, labelVal) {
        var hints = [];
        if (labelKey == "@state") {
            // static list of hints for @silenced label
            hints.push("@state=active");
            hints.push("@state=suppressed");
            hints.push("@state=unprocessed");
            hints.push("@state!=active");
            hints.push("@state!=suppressed");
            hints.push("@state!=unprocessed");
        } else {
            // equal and non-equal hints for everything else
            hints.push(labelKey + "=" + labelVal);
            hints.push(labelKey + "!=" + labelVal);

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

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

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

}());