// Copyright 2019 The Fuchsia Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.

library fuchsia.settings;

/// Settings related to the general system.
///
/// Supported SettingsEpitaph enums:
/// REQUEST_NOT_SUPPORTED, INTERNAL_SERVICE_ERROR, PERSISTENT_STORAGE_ERROR
[Discoverable]
protocol System {
    /// DEPRECATED: new watches should use Watch2.
    [Transitional = "Deprecated in favor of Watch2"]
    Watch() -> (SystemSettings settings) error Error;

    /// Gets the current [SystemSettings]. Returns immediately on first call;
    /// subsequent calls return when the value changes.
    ///
    /// If this call fails, it is considered a fatal error and the channel
    /// will be closed.
    [Transitional = "Replacement for Watch"]
    Watch2() -> (SystemSettings settings);

    /// Changes the settings specified in [SystemSettings]. Any field not set in the table will
    /// not perform any system operation.
    Set(SystemSettings settings) -> () error Error;
};

/// Settings related to the general system.
table SystemSettings {
    /// If set, indicates a login behavior specified at runtime.
    1: LoginOverride mode;
};

/// What preferred login behavior has been set.
enum LoginOverride {
    /// No override has been set.
    NONE = 1;
    /// Do not require an account and login always as guest.
    AUTOLOGIN_GUEST = 2;
    /// Requires a provisioned account through auth provider.
    AUTH_PROVIDER = 3;
};