public async Task <IReadOnlyDictionary <TaskType, int> > GetTaskTypeFilterOptionsAsync(EnglishLevel?level)
{
IReadOnlyList <TaskItem> items;
if (level.HasValue)
{
items = await _taskItemRepository.FindAllAsync(x => x.EnglishLevel == level.Value);
}
else
{
items = await _taskItemRepository.GetAllAsync();
}
return(items
.ToLookup(x => x.TaskType)
.ToDictionary(l => l.Key, l => l.Count()));
}