public async Task AddExperienceFromMonster(List <User> users, Monster monster, string channel)
{
var levels = users.ToDictionary(user => user.Id, user => user.Level);
var userIds = users.Select(user => user.Id).ToList();
_statsRepository.AddMonsterExperienceToUsers(userIds, monster);
var expGainMessageTasks = users.Select(user => _slack.SendEphemeralMessage(string.Format(DougMessages.GainedExp, user.CalculateExperienceGainedFromMonster(monster, users.Count)), user.Id, channel));
var levelUpUsers = users.Where(user => levels.GetValueOrDefault(user.Id) < user.Level).ToList();
LevelUpUsers(levelUpUsers);
var levelUpMessageTasks = levelUpUsers.Select(user => _slack.BroadcastMessage(string.Format(DougMessages.LevelUp, Mention(user), user.Level), channel));
await Task.WhenAll(levelUpMessageTasks.Concat(expGainMessageTasks));
}
