/// <summary>
/// Adds a new food item to a users diary entry for a given date.
/// If the user has no diary entry for that date, then one will be created.
/// Updates the total calories for the diary entry.
/// </summary>
/// <param name="resource"></param>
/// <returns>
/// Unsuccessful FoodItemResponse if the user does not exist;
/// Unsuccessful FoodItemResponse if the string date is not in the format dd-mm-yyyy;
/// Unsuccessful FoodItemResponse if the date is in the future;
/// Unsuccessful FoodItemResponse if there was an issue adding a new diary entry;
/// Unsuccessful FoodItemResponse if there was an issue adding the food item to the diary entry;
/// Successful FoodItemResponse with the food item
/// </returns>
public async Task <FoodItemResponse> AddFoodItemAsync(AddFoodItemResource resource)
{
// validate userId
var userResult = await _userService.GetUserByNameAsync(resource.Username);
if (!userResult.Success)
{
return(new FoodItemResponse(userResult.Message));
}
// validate and convert stringDate to DateTime
DateTime date;
try
{
date = StringDateHelper.ConverStringDateToDate(resource.StringDate);
}
catch (ArgumentException e)
{
return(new FoodItemResponse(e.Message));
}
DiaryEntry diaryEntry;
// check if user has a diary entry for the day
var existingDiaryResult = await _diaryEntryService.GetUsersDiaryEntryForDateAsync(userResult.User.Id, date);
if (!existingDiaryResult.Success)
{ // no diary entry for that day, create one
var diaryEntryResult = await _diaryEntryService.AddDiaryEntryAsync(userResult.User.Id, date);
if (!diaryEntryResult.Success)
{
return(new FoodItemResponse($"Failed to add a new food item: {diaryEntryResult.Message}"));
}
diaryEntry = diaryEntryResult.DiaryEntry;
}
else
{ // user has a diary entry for that day
diaryEntry = existingDiaryResult.DiaryEntry;
}
// create food item
FoodItem foodItem = new FoodItem
{
Name = resource.Name,
Calories = resource.Calories,
DiaryEntry = diaryEntry,
User = userResult.User
};
// update the total calories for the diary entry
diaryEntry.TotalCalories += resource.Calories;
// save the new food item and the changes to the diary entry
try
{
await _foodItemRepository.AddAsync(foodItem);
await _unitOfWork.CompleteAsync();
}
catch (Exception e)
{
return(new FoodItemResponse($"An error occurred when saving the food item: {e}"));
}
return(new FoodItemResponse(foodItem));
}
