public static string ImportUsers(InstagraphContext context, string jsonString)
{
UserDTO[] UsersFromJSON = JsonConvert.DeserializeObject <UserDTO[]>(jsonString);
StringBuilder sb = new StringBuilder();
HashSet <string> usedUsernames = new HashSet <string>();
Dictionary <string, Picture> pictures = context.Pictures.ToDictionary(k => k.Path);
foreach (UserDTO userDTO in UsersFromJSON)
{
bool usernameIsNullOrEmpty = string.IsNullOrWhiteSpace(userDTO.Username);
bool passwordIsNullOrEmpty = string.IsNullOrWhiteSpace(userDTO.Password);
bool profilePictureIsNullEmpty = string.IsNullOrWhiteSpace(userDTO.ProfilePicture);
bool usernameIsNotUnique = true;
if (!usernameIsNullOrEmpty)
{
usernameIsNotUnique = usedUsernames.Contains(userDTO.Username);
}
bool noSuchProfilePicture = true;
if (!profilePictureIsNullEmpty)
{
noSuchProfilePicture = !pictures.ContainsKey(userDTO.ProfilePicture);
}
if (!usernameIsNullOrEmpty && !passwordIsNullOrEmpty && !profilePictureIsNullEmpty && !usernameIsNotUnique && !noSuchProfilePicture)
{
User newUser = new User()
{
Username = userDTO.Username,
Password = userDTO.Password,
ProfilePictureId = pictures[userDTO.ProfilePicture].Id,
ProfilePicture = pictures[userDTO.ProfilePicture]
};
context.Add(newUser);
sb.AppendLine($"Successfully imported User {newUser.Username}.");
usedUsernames.Add(newUser.Username);
}
else
{
sb.AppendLine("Error: Invalid data.");
}
}
context.SaveChanges();
string result = sb.ToString();
return(result);
}