# -*- coding: utf-8 -*-
# Copyright 2019 The Chromium OS Authors. All rights reserved.
# Use of this source code is governed by a BSD-style license that can be
# found in the LICENSE file.

"""SDK chroot operations."""

from __future__ import print_function

import os
import sys

from chromite.api import controller
from chromite.api import faux
from chromite.api import validate
from chromite.api.controller import controller_util
from chromite.lib import cros_build_lib
from chromite.service import sdk


assert sys.version_info >= (3, 6), 'This module requires Python 3.6+'


def _ChrootVersionResponse(_input_proto, output_proto, _config):
  """Add a fake chroot version to a successful response."""
  output_proto.version.version = 168


@faux.success(_ChrootVersionResponse)
@faux.empty_error
def Create(input_proto, output_proto, config):
  """Chroot creation, includes support for replacing an existing chroot.

  Args:
    input_proto (CreateRequest): The input proto.
    output_proto (CreateResponse): The output proto.
    config (api_config.ApiConfig): The API call config.
  """
  replace = not input_proto.flags.no_replace
  bootstrap = input_proto.flags.bootstrap
  use_image = not input_proto.flags.no_use_image

  chroot_path = input_proto.chroot.path
  cache_dir = input_proto.chroot.cache_dir

  if chroot_path and not os.path.isabs(chroot_path):
    cros_build_lib.Die('The chroot path must be absolute.')

  if config.validate_only:
    return controller.RETURN_CODE_VALID_INPUT

  args = sdk.CreateArguments(
      replace=replace,
      bootstrap=bootstrap,
      use_image=use_image,
      cache_dir=cache_dir,
      chroot_path=chroot_path)

  version = sdk.Create(args)

  if version:
    output_proto.version.version = version
  else:
    # This should be very rare, if ever used, but worth noting.
    cros_build_lib.Die('No chroot version could be found. There was likely an'
                       'error creating the chroot that was not detected.')


@faux.success(_ChrootVersionResponse)
@faux.empty_error
@validate.validation_complete
def Update(input_proto, output_proto, _config):
  """Update the chroot.

  Args:
    input_proto (UpdateRequest): The input proto.
    output_proto (UpdateResponse): The output proto.
    _config (api_config.ApiConfig): The API call config.
  """
  build_source = input_proto.flags.build_source
  targets = [target.name for target in input_proto.toolchain_targets]
  toolchain_changed = input_proto.flags.toolchain_changed

  args = sdk.UpdateArguments(
      build_source=build_source,
      toolchain_targets=targets,
      toolchain_changed=toolchain_changed)

  version = sdk.Update(args)

  if version:
    output_proto.version.version = version
  else:
    # This should be very rare, if ever used, but worth noting.
    cros_build_lib.Die('No chroot version could be found. There was likely an'
                       'error creating the chroot that was not detected.')


@faux.all_empty
@validate.validation_complete
def Delete(input_proto, _output_proto, _config):
  """Delete a chroot."""
  chroot = controller_util.ParseChroot(input_proto.chroot)
  sdk.Delete(chroot)


@faux.all_empty
@validate.validation_complete
def Unmount(input_proto, _output_proto, _config):
  """Unmount a chroot"""
  chroot = controller_util.ParseChroot(input_proto.chroot)
  sdk.Unmount(chroot)


@faux.all_empty
@validate.validation_complete
def Clean(input_proto, _output_proto, _config):
  """Clean unneeded files from a chroot."""
  chroot = controller_util.ParseChroot(input_proto.chroot)
  sdk.Clean(chroot, images=True, sysroots=True, tmp=True)


@faux.all_empty
@validate.validation_complete
def CreateSnapshot(input_proto, output_proto, _config):
  """Create a chroot snapshot and return a corresponding opaque snapshot key."""
  chroot = controller_util.ParseChroot(input_proto.chroot)
  token = sdk.CreateSnapshot(chroot, replace_if_needed=True)
  output_proto.snapshot_token.value = token


@faux.all_empty
@validate.validation_complete
def RestoreSnapshot(input_proto, _output_proto, _config):
  """Restore a chroot snapshot from a snapshot key."""
  chroot = controller_util.ParseChroot(input_proto.chroot)
  token = input_proto.snapshot_token.value
  sdk.RestoreSnapshot(token, chroot)