var autocompleteMatchGroups = function (sQuery, myGroups) {

    // Case insensitive matching

    var query = sQuery.toLowerCase();

    var i = 0;

    var l = myGroups.length;

    var matches = [];

    // Match against each name of each group

    for (; i < l; i++) {

        var matched_group = myGroups[i];

        if (matched_group.grname.toLowerCase().indexOf(query) > -1) {

            matches[matches.length] = matched_group;

        }

    }

    return matches;

};

// Highlight the snippet if it is found in the full text.

// Snippet must be lowercased already.

var autocompleteHighlightMatch = function (full, snippet) {

    var matchindex = full.toLowerCase().indexOf(snippet);

    if (matchindex <0)

        return full;

    return full.substring(0, matchindex)

        + full.substr(matchindex, snippet.length)

};

// Return html snippet for showing the provided gravatar url

var gravatar = function(gravatar_lnk, size, cssclass) {

    if (!gravatar_lnk) {

        return '';

    }

    if (gravatar_lnk == 'default') {

        return '<i class="icon-user {1}" style="font-size: {0}px;"></i>'.format(size, cssclass);

    }

    return '<img alt="" class="{2}" style="width: {0}px; height: {0}px" src="{1}"/>'.format(size, gravatar_lnk, cssclass);

}

var autocompleteGravatar = function(res, gravatar_lnk, size, group) {

    var elem;

    if (group !== undefined) {

        elem = '<i class="perm-gravatar-ac icon-users"></i>';

    } else {

        elem = gravatar(gravatar_lnk, size, "perm-gravatar-ac");

    }

    return '<div class="ac-container-wrap">{0}{1}</div>'.format(elem, res);

}

// Custom formatter to highlight the matching letters