// Copyright 2017 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.devicesettings;

type Status = strict enum : uint8 {
    ok = 1;
    errNotSet = 2;
    errInvalidSetting = 3;
    errRead = 4;
    errIncorrectType = 5;
    errUnknown = 6;
};

type ValueType = strict enum : uint8 {
    number = 1;
    text = 2;
};

/// Manager interface used to manage settings
@discoverable
protocol DeviceSettingsManager {
    GetInteger(struct {
        key string;
    }) -> (struct {
        val int64;
        s Status;
    });

    GetString(struct {
        key string;
    }) -> (struct {
        val string;
        s Status;
    });

    /// Returns false on database error and true on success.
    SetInteger(struct {
        key string;
        val int64;
    }) -> (struct {
        result bool;
    });

    /// Returns false on database error and true on success.
    SetString(struct {
        key string;
        val string;
    }) -> (struct {
        result bool;
    });

    /// Register a watcher to be called when a setting changes
    /// Returns Status::ok, Status::errInvalidSetting or Status::errUnknown
    Watch(resource struct {
        key string;
        watcher client_end:DeviceSettingsWatcher;
    }) -> (struct {
        s Status;
    });
};

/// A watcher for device settings changes
protocol DeviceSettingsWatcher {
    OnChangeSettings(struct {
        type ValueType;
    });
};