# This file is part of the Trezor project.
#
# Copyright (C) 2012-2022 SatoshiLabs and contributors
#
# This library is free software: you can redistribute it and/or modify
# it under the terms of the GNU Lesser General Public License version 3
# as published by the Free Software Foundation.
#
# This library is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
# GNU Lesser General Public License for more details.
#
# You should have received a copy of the License along with this library.
# If not, see <https://www.gnu.org/licenses/lgpl-3.0.html>.

import secrets
import sys
from typing import TYPE_CHECKING, Optional, Sequence, Tuple

import click

from .. import debuglink, device, exceptions, messages, ui
from . import ChoiceType, with_client

if TYPE_CHECKING:
    from ..client import TrezorClient
    from ..protobuf import MessageType
    from . import TrezorConnection

RECOVERY_DEVICE_INPUT_METHOD = {
    "scrambled": messages.RecoveryDeviceInputMethod.ScrambledWords,
    "matrix": messages.RecoveryDeviceInputMethod.Matrix,
}

BACKUP_TYPE = {
    "bip39": messages.BackupType.Bip39,
    "single": messages.BackupType.Slip39_Single_Extendable,
    "shamir": messages.BackupType.Slip39_Basic,
    "advanced": messages.BackupType.Slip39_Advanced,
}

SD_PROTECT_OPERATIONS = {
    "on": messages.SdProtectOperationType.ENABLE,
    "off": messages.SdProtectOperationType.DISABLE,
    "refresh": messages.SdProtectOperationType.REFRESH,
}


@click.group(name="device")
def cli() -> None:
    """Device management commands - setup, recover seed, wipe, etc."""


@cli.command()
@click.option(
    "-b",
    "--bootloader",
    help="Wipe device in bootloader mode. This also erases the firmware.",
    is_flag=True,
)
@with_client
def wipe(client: "TrezorClient", bootloader: bool) -> str:
    """Reset device to factory defaults and remove all private data."""
    if bootloader:
        if not client.features.bootloader_mode:
            click.echo("Please switch your device to bootloader mode.")
            sys.exit(1)
        else:
            click.echo("Wiping user data and firmware!")
    else:
        if client.features.bootloader_mode:
            click.echo(
                "Your device is in bootloader mode. This operation would also erase firmware."
            )
            click.echo(
                'Specify "--bootloader" if that is what you want, or disconnect and reconnect device in normal mode.'
            )
            click.echo("Aborting.")
            sys.exit(1)
        else:
            click.echo("Wiping user data!")

    try:
        return device.wipe(client)
    except exceptions.TrezorFailure as e:
        click.echo("Action failed: {} {}".format(*e.args))
        sys.exit(3)


@cli.command()
@click.option("-m", "--mnemonic", multiple=True)
@click.option("-p", "--pin", default="")
@click.option("-r", "--passphrase-protection", is_flag=True)
@click.option("-l", "--label", default="")
@click.option("-i", "--ignore-checksum", is_flag=True)
@click.option("-s", "--slip0014", is_flag=True)
@click.option("-b", "--needs-backup", is_flag=True)
@click.option("-n", "--no-backup", is_flag=True)
@with_client
def load(
    client: "TrezorClient",
    mnemonic: Sequence[str],
    pin: str,
    passphrase_protection: bool,
    label: str,
    ignore_checksum: bool,
    slip0014: bool,
    needs_backup: bool,
    no_backup: bool,
) -> str:
    """Upload seed and custom configuration to the device.

    This functionality is only available in debug mode.
    """
    if slip0014 and mnemonic:
        raise click.ClickException("Cannot use -s and -m together.")

    if slip0014:
        mnemonic = [" ".join(["all"] * 12)]
        if not label:
            label = "SLIP-0014"

    try:
        return debuglink.load_device(
            client,
            mnemonic=list(mnemonic),
            pin=pin,
            passphrase_protection=passphrase_protection,
            label=label,
            skip_checksum=ignore_checksum,
            needs_backup=needs_backup,
            no_backup=no_backup,
        )
    except exceptions.TrezorFailure as e:
        if e.code == messages.FailureType.UnexpectedMessage:
            raise click.ClickException(
                "Unrecognized message. Make sure your Trezor is using debug firmware."
            )
        else:
            raise


@cli.command()
@click.option("-w", "--words", type=click.Choice(["12", "18", "24"]), default="24")
@click.option("-e", "--expand", is_flag=True)
@click.option("-p", "--pin-protection", is_flag=True)
@click.option("-r", "--passphrase-protection", is_flag=True)
@click.option("-l", "--label")
@click.option("-u", "--u2f-counter", default=None, type=int)
@click.option(
    "-i",
    "--input_method",
    "-t",
    "--type",
    type=ChoiceType(RECOVERY_DEVICE_INPUT_METHOD),
    default="scrambled",
)
@click.option("-d", "--dry-run", is_flag=True)
@click.option("-b", "--unlock-repeated-backup", is_flag=True)
@with_client
def recover(
    client: "TrezorClient",
    words: str,
    expand: bool,
    pin_protection: bool,
    passphrase_protection: bool,
    label: Optional[str],
    u2f_counter: int,
    input_method: messages.RecoveryDeviceInputMethod,
    dry_run: bool,
    unlock_repeated_backup: bool,
) -> "MessageType":
    """Start safe recovery workflow."""
    if input_method == messages.RecoveryDeviceInputMethod.ScrambledWords:
        input_callback = ui.mnemonic_words(expand)
    else:
        input_callback = ui.matrix_words
        click.echo(ui.RECOVERY_MATRIX_DESCRIPTION)

    if dry_run and unlock_repeated_backup:
        raise click.ClickException("Cannot use -d and -b together.")

    type = None
    if dry_run:
        type = messages.RecoveryType.DryRun
    if unlock_repeated_backup:
        type = messages.RecoveryType.UnlockRepeatedBackup

    return device.recover(
        client,
        word_count=int(words),
        passphrase_protection=passphrase_protection,
        pin_protection=pin_protection,
        label=label,
        u2f_counter=u2f_counter,
        input_callback=input_callback,
        input_method=input_method,
        type=type,
    )


@cli.command()
@click.option("-e", "--show-entropy", is_flag=True)
@click.option("-t", "--strength", type=click.Choice(["128", "192", "256"]))
@click.option("-r", "--passphrase-protection", is_flag=True)
@click.option("-p", "--pin-protection", is_flag=True)
@click.option("-l", "--label")
@click.option("-u", "--u2f-counter", default=0)
@click.option("-s", "--skip-backup", is_flag=True)
@click.option("-n", "--no-backup", is_flag=True)
@click.option("-b", "--backup-type", type=ChoiceType(BACKUP_TYPE), default="single")
@with_client
def setup(
    client: "TrezorClient",
    show_entropy: bool,
    strength: Optional[int],
    passphrase_protection: bool,
    pin_protection: bool,
    label: Optional[str],
    u2f_counter: int,
    skip_backup: bool,
    no_backup: bool,
    backup_type: messages.BackupType,
) -> str:
    """Perform device setup and generate new seed."""
    if strength:
        strength = int(strength)

    if (
        backup_type == messages.BackupType.Slip39_Basic
        and messages.Capability.Shamir not in client.features.capabilities
    ) or (
        backup_type == messages.BackupType.Slip39_Advanced
        and messages.Capability.ShamirGroups not in client.features.capabilities
    ):
        click.echo(
            "WARNING: Your Trezor device does not indicate support for the requested\n"
            "backup type. Traditional single-seed backup may be generated instead."
        )

    return device.reset(
        client,
        display_random=show_entropy,
        strength=strength,
        passphrase_protection=passphrase_protection,
        pin_protection=pin_protection,
        label=label,
        u2f_counter=u2f_counter,
        skip_backup=skip_backup,
        no_backup=no_backup,
        backup_type=backup_type,
    )


@cli.command()
@click.option("-t", "--group-threshold", type=int)
@click.option("-g", "--group", "groups", type=(int, int), multiple=True, metavar="T N")
@with_client
def backup(
    client: "TrezorClient",
    group_threshold: Optional[int] = None,
    groups: Sequence[Tuple[int, int]] = (),
) -> str:
    """Perform device seed backup."""

    return device.backup(client, group_threshold, groups)


@cli.command()
@click.argument("operation", type=ChoiceType(SD_PROTECT_OPERATIONS))
@with_client
def sd_protect(
    client: "TrezorClient", operation: messages.SdProtectOperationType
) -> str:
    """Secure the device with SD card protection.

    When SD card protection is enabled, a randomly generated secret is stored
    on the SD card. During every PIN checking and unlocking operation this
    secret is combined with the entered PIN value to decrypt data stored on
    the device. The SD card will thus be needed every time you unlock the
    device. The options are:

    \b
    on - Generate SD card secret and use it to protect the PIN and storage.
    off - Remove SD card secret protection.
    refresh - Replace the current SD card secret with a new one.
    """
    if client.features.model == "1":
        raise click.ClickException("Trezor One does not support SD card protection.")
    return device.sd_protect(client, operation)


@cli.command()
@click.pass_obj
def reboot_to_bootloader(obj: "TrezorConnection") -> str:
    """Reboot device into bootloader mode.

    Currently only supported on Trezor Model One.
    """
    # avoid using @with_client because it closes the session afterwards,
    # which triggers double prompt on device
    with obj.client_context() as client:
        return device.reboot_to_bootloader(client)


@cli.command()
@with_client
def tutorial(client: "TrezorClient") -> str:
    """Show on-device tutorial."""
    return device.show_device_tutorial(client)


@cli.command()
@with_client
def unlock_bootloader(client: "TrezorClient") -> str:
    """Unlocks bootloader. Irreversible."""
    return device.unlock_bootloader(client)


@cli.command()
@click.argument("enable", type=ChoiceType({"on": True, "off": False}), required=False)
@click.option(
    "-e",
    "--expiry",
    type=int,
    help="Dialog expiry in seconds.",
)
@with_client
def set_busy(
    client: "TrezorClient", enable: Optional[bool], expiry: Optional[int]
) -> str:
    """Show a "Do not disconnect" dialog."""
    if enable is False:
        return device.set_busy(client, None)

    if expiry is None:
        raise click.ClickException("Missing option '-e' / '--expiry'.")

    if expiry <= 0:
        raise click.ClickException(
            f"Invalid value for '-e' / '--expiry': '{expiry}' is not a positive integer."
        )

    return device.set_busy(client, expiry * 1000)


@cli.command()
@click.argument("hex_challenge", required=False)
@with_client
def authenticate(client: "TrezorClient", hex_challenge: Optional[str]) -> None:
    """Get information to verify the authenticity of the device."""
    if hex_challenge is None:
        hex_challenge = secrets.token_hex(32)
    click.echo(f"Challenge: {hex_challenge}")
    challenge = bytes.fromhex(hex_challenge)
    msg = device.authenticate(client, challenge)
    click.echo(f"Signature of challenge: {msg.signature.hex()}")
    click.echo(f"Device certificate: {msg.certificates[0].hex()}")
    for cert in msg.certificates[1:]:
        click.echo(f"CA certificate: {cert.hex()}")