part of "authentication_service.dart";

/// An abstract class that defines the authentication interface.
///
/// This interface provides methods for various authentication operations, including
/// signing in, signing up, resetting passwords, and managing tokens.
abstract class ArcaneAuthInterface {
  /// Returns `true` if the user is currently signed in.
  ///
  /// This is a getter that asynchronously checks if the user has an active session.
  Future<bool> get isSignedIn;

  /// Returns the access token if available.
  ///
  /// This is used to retrieve the current session's access token for authenticated
  /// API requests. Returns `null` if the user is not signed in or the token is unavailable.
  Future<String?>? get accessToken;

  /// Returns the refresh token if available.
  ///
  /// The refresh token is used to renew access tokens when they expire. Returns `null` if
  /// the user is not signed in or the token is unavailable.
  Future<String?>? get refreshToken;

  /// Initializes the authentication interface.
  ///
  /// This method sets up any necessary configurations or initializations required for
  /// the authentication process. It must be called before any other methods in the interface.
  Future<void> init();

  /// Logs the user out of the session.
  ///
  /// This method terminates the current session and removes any stored tokens.
  /// Returns a `Result` that either contains a `void` on success or an error message.
  Future<Result<void, String>> logout();

  /// Logs the user in using an optional, generic `T` type of input.
  /// This login method is a generic method that can be used to login with any
  /// type of input. It is useful for login methods that do not require an email
  /// and password. Any type of input can be passed in, and it will be handled
  /// by the implementation of the method wihin the specific authentication
  /// service.
  ///
  /// Example:
  /// ```dart
  /// await authInterface.login<Map<String, String>>(
  ///   input: {
  ///     "username": "hello@world.com",
  ///     "password": "password",
  ///   },
  /// );
  /// ```
  Future<Result<void, String>> login<T>({
    T? input,
    Future<void> Function()? onLoggedIn,
  });

  /// Re-sends a verification code to the user's email address.
  ///
  /// This method is typically used when the user hasn't received or has lost their initial
  /// verification code. Returns a `Result` that contains the verification code on success
  /// or an error message.
  Future<Result<String, String>>? resendVerificationCode<T>({T? input});

  /// Registers a new account using user-supplied input.
  ///
  /// This method registers a new user in the system. Returns a `Result` that contains
  /// the next [SignUpStep] in the process on success or an error message.
  ///
  /// Example:
  /// ```dart
  /// await authInterface.register(
  ///   email: "user@example.com",
  ///   password: "password123",
  /// );
  /// ```
  Future<Result<SignUpStep, String>>? register<T>({T? input});

  /// Confirms a user's signup using a username and a confirmation code.
  ///
  /// This method completes the sign-up process by verifying the user's confirmation code.
  /// Returns a `Result` that contains `true` on success or an error message.
  Future<Result<bool, String>>? confirmSignup({
    String? username,
    String? confirmationCode,
  });

  /// Resets a user's password using an email address and a code.
  ///
  /// This method is used when a user requests to reset their password. The reset code
  /// they receive via email is used to verify the request. Optionally, a new password can
  /// be provided. Returns a `Result` that contains `true` on success or an error message.
  ///
  /// This method may be called twice. In the first instance, the `email` is provided, which
  /// triggers a password reset confirmation email to be sent, containing a password reset
  /// code or pin. The second call should include the `email`, the user's new password
  /// (`newPassword`), and the `code` they received in their email.
  Future<Result<bool, String>>? resetPassword({
    String? email,
    String? newPassword,
    String? code,
  });
}