var failure = function(o){

            alert("deleteNotification failure");

        };

    var postData = {};

    var sUrl = url.replace('__NOTIFICATION_ID__',notification_id);

    ajaxPOST(sUrl, postData, success, failure);

};

var readNotification = function(url, notification_id, callbacks){

    var success = function(o){

            var $obj = $("#notification_"+notification_id);

            $obj.removeClass('list-group-item-warning');

            $obj.find('.read-notification').remove();

            _run_callbacks(callbacks);

        };

    var failure = function(o){

            alert("readNotification failure");

        };

    var postData = {};

    var sUrl = url.replace('__NOTIFICATION_ID__',notification_id);

    ajaxPOST(sUrl, postData, success, failure);

};

/**

 * Autocomplete functionality

 */

// Custom search function for the DataSource of users

var autocompleteMatchUsers = function (sQuery, myUsers) {

    // Case insensitive matching

    var query = sQuery.toLowerCase();

    var i = 0;

    var l = myUsers.length;

    var matches = [];

    // Match against each name of each contact

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

        var contact = myUsers[i];

        if (((contact.fname+"").toLowerCase().indexOf(query) > -1) ||

             ((contact.lname+"").toLowerCase().indexOf(query) > -1) ||

             ((contact.nname) && ((contact.nname).toLowerCase().indexOf(query) > -1))) {

            matches[matches.length] = contact;

        }

    }

    return matches;

};

// Custom search function for the DataSource of userGroups

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;

};

// Helper highlight function for the formatter

var autocompleteHighlightMatch = function (full, snippet, matchindex) {

    return full.substring(0, matchindex)

        + "<span class='match'>"

        + full.substr(matchindex, snippet.length)

        + "</span>" + full.substring(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

var autocompleteFormatter = function (oResultData, sQuery, sResultMatch) {

    // group

    if (oResultData.grname != undefined) {

        var grname = oResultData.grname;

        var grmembers = oResultData.grmembers;

        var grnameMatchIndex = grname.toLowerCase().indexOf(query);

        var grprefix = "{0}: ".format(_TM['Group']);

        var grsuffix = " ({0} {1})".format(grmembers, _TM['members']);

        if (grnameMatchIndex > -1) {

            return autocompleteGravatar(grprefix + autocompleteHighlightMatch(grname, query, grnameMatchIndex) + grsuffix, null, null, true);

        }

        return autocompleteGravatar(grprefix + oResultData.grname + grsuffix, null, null, true);

    // users

    } else if (oResultData.nname != undefined) {

        var fname = oResultData.fname || "";

        var lname = oResultData.lname || "";

        var nname = oResultData.nname;

        // Guard against null value

        var fnameMatchIndex = fname.toLowerCase().indexOf(query),

            lnameMatchIndex = lname.toLowerCase().indexOf(query),

            nnameMatchIndex = nname.toLowerCase().indexOf(query),

            displayfname, displaylname, displaynname, displayname;

        if (fnameMatchIndex > -1) {

            displayfname = autocompleteHighlightMatch(fname, query, fnameMatchIndex);

        } else {

            displayfname = fname;

        }

        if (lnameMatchIndex > -1) {

            displaylname = autocompleteHighlightMatch(lname, query, lnameMatchIndex);

        } else {

            displaylname = lname;

        }

        if (nnameMatchIndex > -1) {

            displaynname = autocompleteHighlightMatch(nname, query, nnameMatchIndex);

        } else {

            displaynname = nname;

        }

        displayname = displaynname;

        if (displayfname && displaylname) {

            displayname = "{0} {1} ({2})".format(displayfname, displaylname, displayname);

        }

        return autocompleteGravatar(displayname, oResultData.gravatar_lnk, oResultData.gravatar_size);

    } else {

        return '';

    }

};

// Generate a basic autocomplete instance that can be tweaked further by the caller

var autocompleteCreate = function ($inputElement, matchFunc) {

    var $container = $('<div/>').insertAfter($inputElement);

    var datasource = new YAHOO.util.FunctionDataSource(matchFunc);

    var autocomplete = new YAHOO.widget.AutoComplete($inputElement[0], $container[0], datasource);

    autocomplete.useShadow = false;

    autocomplete.resultTypeList = false;

    autocomplete.animVert = false;

    autocomplete.animHoriz = false;

    autocomplete.animSpeed = 0.1;

    autocomplete.formatResult = autocompleteFormatter;

    return autocomplete;

}

var SimpleUserAutoComplete = function ($inputElement, users_list) {

    var matchUsers = function (sQuery) {

        return autocompleteMatchUsers(sQuery, users_list);

    }

    var userAC = autocompleteCreate($inputElement, matchUsers);

    // Handler for selection of an entry

    var itemSelectHandler = function (sType, aArgs) {

        var myAC = aArgs[0]; // reference back to the AC instance

        var elLI = aArgs[1]; // reference to the selected LI element

        var oData = aArgs[2]; // object literal of selected item's result data

        myAC.getInputEl().value = oData.nname;

    };

    userAC.itemSelectEvent.subscribe(itemSelectHandler);

}

var MembersAutoComplete = function ($inputElement, users_list, groups_list) {

    var matchAll = function (sQuery) {

        var u = autocompleteMatchUsers(sQuery, users_list);

        var g = autocompleteMatchGroups(sQuery, groups_list);

        return u.concat(g);

    };