relatica/lib/utils/active_profile_selector.dart

import 'package:flutter/foundation.dart';
import 'package:relatica/services/auth_service.dart';
import 'package:result_monad/result_monad.dart';

import '../globals.dart';
import '../models/auth/profile.dart';
import '../models/exec_error.dart';

class ActiveProfileSelector<T extends ChangeNotifier> extends ChangeNotifier {
  final _entries = <Profile, T>{};

  final T Function(Profile p) _entryBuilder;

  ActiveProfileSelector(T Function(Profile p) entryBuilder)
      : _entryBuilder = entryBuilder;

  Result<T, ExecError> get activeEntry {
    final service = getIt<AccountsService>();
    if (!service.loggedIn) {
      return buildErrorResult(
        type: ErrorType.localError,
        message: 'No Logged In User',
      );
    }

    final p = service.currentProfile;
    return runCatching(() {
      final entry = _entries.putIfAbsent(p, () => _buildNewEntry(p));
      return Result.ok(entry).execErrorCast();
    }).execErrorCast();
  }

  T _buildNewEntry(Profile p) {
    final newEntry = _entryBuilder(p);
    newEntry.addListener(() => notifyListeners());
    return newEntry;
  }
}