public async Task <CategoryViewModel> GetCategoriesAsync(long?categoryId = null, int levels = 1)
{
CategoryViewModel result;
if (categoryId.HasValue)
{
var category = await _catalogApi.GetCategoryAsync(_catalogApi.GetCategoryUri(categoryId.Value)).ConfigureAwait(false);
if (category == null)
{
result = null;
}
else
{
var parent = CreateCategoryViewModel(category, category.Id);
await GenerateChildCategoryViewModels(parent, category.Categories, levels).ConfigureAwait(false);
result = parent;
}
}
else
{
var categories = await _catalogApi.GetCategoriesAsync().ConfigureAwait(false);
var categoryViewModel = new CategoryViewModel
{
CategoryId = 0,
DisplayName = "Root",
Image = string.Empty
};
await GenerateChildCategoryViewModels(categoryViewModel, categories, levels).ConfigureAwait(false);
result = categoryViewModel;
}
return(result);
}