var waitTime = 1; // In seconds
var group = 2979183; // 0 for no group check, otherwise people in this group will not receive the message
function sendMsg(userId, username) {
    function send() {
        $.post('//www.roblox.com/messages/send',{
            subject: "Join This Group For a High Rank!",
            body: "We would love to have you as a soldier of our very powerful group, you will be offered a very high rank, join House Reyne! Join https://www.roblox.com/My/Groups.aspx?gid=2929223 .",
            recipientid: userId,
            cacheBuster: new Date().getTime()
        }).done(function(response) {
            if (response.success == true) {
                console.log('Sent message to ' + username + ' (' + userId + ')');
            } else {
                console.log('Error sending to ' + username + ': ' + response.shortMessage);
            }
        });
    }
    if (group > 0) {
        $.get('//www.roblox.com/Game/LuaWebService/HandleSocialRequest.ashx?method=IsInGroup&playerid=' + userId + '&groupid=' + group, function(response) {
            if(response.indexOf('true') == -1) {
                send();
            } else {
                console.log('Didn\'t send a message to ' + username + ' because he is already in group ' + group + '.');
            }
        });
    } else {
        send();
    }
}

function run() {
    var timeout = 0;
    var elements = document.evaluate('//div[contains(@id,\'ctl00_cphRoblox_rbxGroupRoleSetMembersPane_GroupMembersUpdatePanel\')]//div[contains(@class,\'GroupMember\')]//span[contains(@class,\'Name\')]/a',document,null,XPathResult.UNORDERED_NODE_ITERATOR_TYPE,null);
    var currentNode = elements.iterateNext();
    while (currentNode) {
        (function(time,id,name) {
            setTimeout(sendMsg,time,id,name);
        })(timeout,currentNode.href.match(/\d+/)[0],currentNode.textContent);
        timeout+=waitTime*1000;
        currentNode = elements.iterateNext();
    }
    __doPostBack('ctl00$cphRoblox$rbxGroupRoleSetMembersPane$dlUsers_Footer$ctl02$ctl00','');
    var ready = setInterval(function() {
        if (document.getElementById('__EVENTTARGET').value == '') {
            clearInterval(ready);
            setTimeout(run,timeout);
        }
    }, 10);
}
var ready = setInterval(function() {
    if (document.readyState === 'complete') {
        clearInterval(ready);
        run();
    }
}, 10);