// 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.developer.bridge;

// Covers the FFX Daemon Fastboot protocol. For information about how the fastboot
// protocol works, see:
// https://android.googlesource.com/platform/system/core/+/HEAD/fastboot/
// for the most up-to-date information.

/// The maximum size of a fastboot response is 256 bytes, minus
/// four bytes for the header defining the type of message.
const MAX_FASTBOOT_MESSAGE_SIZE uint32 = 252;

type FastbootError = strict enum {
    PROTOCOL_ERROR = 1;
    COMMUNICATION_ERROR = 2;
    REDISCOVERED_ERROR = 3;
    @deprecated
    TARGET_ERROR = 4;
    @deprecated
    NON_FASTBOOT_DEVICE = 5;
    REBOOT_FAILED = 6;
};

/// Callback event listener for upload progress.
protocol UploadProgressListener {
    OnError(struct {
        error string:MAX;
    });
    OnStarted(struct {
        size uint64;
    });
    OnProgress(struct {
        bytes_written uint64;
    });
    OnFinished();
};

/// Callback event listener for when the device reboots to the
/// bootloader.
protocol RebootListener {
    OnReboot();
};


/// Callback event listener for listing all variables.
protocol VariableListener {
    OnVariable(struct {
        name string:64;
        value string:64;
    });
};


@discoverable
protocol Fastboot {
    Prepare(resource struct {
        listener client_end:RebootListener;
    }) -> (struct {}) error FastbootError;
    GetVar(struct {
        name string:64;
    }) -> (struct {
        value string:64;
    }) error FastbootError;
    GetAllVars(resource struct {
        listener client_end:VariableListener;
    }) -> (struct {}) error FastbootError;
    Flash(resource struct {
        partition_name string:64;
        path string:256;
        listener client_end:UploadProgressListener;
    }) -> (struct {}) error FastbootError;
    Erase(struct {
        partition_name string:64;
    }) -> (struct {}) error FastbootError;
    Reboot() -> (struct {}) error FastbootError;
    RebootBootloader(resource struct {
        listener client_end:RebootListener;
    }) -> (struct {}) error FastbootError;
    ContinueBoot() -> (struct {}) error FastbootError;
    GetStaged(resource struct {
        path string:256;
    }) -> (struct {}) error FastbootError;
    Stage(resource struct {
        path string:256;
        listener client_end:UploadProgressListener;
    }) -> (struct {}) error FastbootError;
    SetActive(struct {
        slot string:64;
    }) -> (struct {}) error FastbootError;
    Oem(struct {
        command string:64;
    }) -> (struct {}) error FastbootError;
};

type FastbootTarget = table {
    /// The fastboot serial number of the target.
    1: serial string:MAX_FASTBOOT_MESSAGE_SIZE;
};

@discoverable
protocol FastbootTargetStream {
    /// Gets the next target from the protocol. Intended to be used as a hanging get
    /// on the client side.
    GetNext() -> (struct {
        target FastbootTarget;
    });
};