Linking Firebase Authenticated user with 'users' collection in Flutter - flutter

Question

New to flutter, and first post here!
I am building a mobile app with flutter, using Firebase and Cloud Firestore. Each user, when authenticated (by email and password), is also currently then added to a 'users' collection in Firestore - like this:
sign up method:
Future signUp() async {
if (passwordConfirmed()) {
await FirebaseAuth.instance.createUserWithEmailAndPassword(
email: _emailController.text.trim(),
password: _passwordController.text.trim(),
);
// add user details
addUserDetails(
_firstNameController.text.trim(),
_lastNameController.text.trim(),
_emailController.text.trim(),
_baseStationController.text.trim(),
);
}
}
Future addUserDetails(String firstName, String lastName, String email,
String baseStation) async {
await FirebaseFirestore.instance.collection('users').add({
'first name': firstName,
'last name': lastName,
'email': email,
'base station': baseStation,
});
}
The signup() method is called when they input their information into text fields within a form, and click a button. This works successfully, and my user collection receives the data, and sign in/out works as it should.
Those users have a 'base station' (which is stored as a field within that users document in Firestore) which is their place of work. I want to show a welcome screen when they log in, so that the current users 'base station' is displayed.
I can access their email address using:
final thisUser = FirebaseAuth.instance.currentUser!;
and then for example to show this when they log in:
Text('Hello, ${thisUser.email!}')
this works no problem, however...
I can't work out how their authentication then links to the collection, so I want to show the 'base station' for the 'currentUser' for example when they log in (I don't want them to have to select their base station every time from a picker when they've already provided the information on sign up.
As an aside - I can also (separately) successfully read the data from the collection and (for example) create a listView builder with the users collection information, but this is for all users, and not specifically the 'currentUser' that is logged in.
All help gratefully received, apologies if I have missed anything.

Answer 1

update addUserDetails as follows
Future addUserDetails(String firstName, String lastName, String email,
String baseStation) async {
await FirebaseFirestore.instance.collection('users').doc(FirebaseAuth.instance.currentUser!.uid).set({
'first name': firstName,
'last name': lastName,
'email': email,
'base station': baseStation,
});
if you then want to get specific user detail then use the code as follows
final user = await FirebaseFirestore.instance.collection('users').doc(FirebaseAuth.instance.currentUser!.uid).get();