# -*- coding: utf-8 -*- #
# Copyright 2017 Google LLC. All Rights Reserved.
#
# Licensed under the Apache License, Version 2.0 (the "License");
# you may not use this file except in compliance with the License.
# You may obtain a copy of the License at
#
#    http://www.apache.org/licenses/LICENSE-2.0
#
# Unless required by applicable law or agreed to in writing, software
# distributed under the License is distributed on an "AS IS" BASIS,
# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
# See the License for the specific language governing permissions and
# limitations under the License.

"""Support library for execution with the container builds submit command."""

from __future__ import absolute_import
from __future__ import division
from __future__ import unicode_literals

import threading

from googlecloudsdk.core import log
from googlecloudsdk.core.util import keyboard_interrupt
import six


class MashHandler(object):
  """MashHandler only invokes its base handler once.

  On the third attempt, the execution is hard-killed.
  """

  def __init__(self, base_handler):
    self._interrupts = 0
    self._base_handler = base_handler
    self._lock = threading.Lock()

  def __call__(self, signal_number, stack_frame):
    with self._lock:
      self._interrupts += 1
      # Copy the interrupts count and perform the handler outside of this
      # lock context. The handler can take a long time and we want to make
      # sure that future interrupts don't wait for it.
      interrupts = self._interrupts
    if interrupts == 1:
      # Only do the base handler once.
      self._base_handler(signal_number, stack_frame)
    elif interrupts == 3:
      # If we detect mashing, fallback to gcloud's original handler.
      keyboard_interrupt.HandleInterrupt(signal_number, stack_frame)


def GetCancelBuildHandler(client, messages, build_ref):
  """Returns a handler to cancel a build.

  Args:
    client: base_api.BaseApiClient, An instance of the Cloud Build client.
    messages: Module containing the definitions of messages for Cloud Build.
    build_ref: Build reference. Expects a cloudbuild.projects.locations.builds
      but also supports cloudbuild.projects.builds.
  """
  def _CancelBuildHandler(unused_signal_number, unused_stack_frame):
    """Cancels the build_ref build.

    Args:
      unused_signal_number: The signal caught.
      unused_stack_frame: The interrupt stack frame.

    Raises:
      InvalidUserInputError: if project ID or build ID is not specified.
    """
    log.status.Print('Cancelling...')

    # accepting both build_refs and legacy build_refs
    project_id = None
    if hasattr(build_ref, 'projectId'):
      project_id = build_ref.projectId
    elif hasattr(build_ref, 'projectsId'):
      project_id = build_ref.projectsId

    build_id = None
    if hasattr(build_ref, 'id'):
      build_id = build_ref.id
    elif hasattr(build_ref, 'buildsId'):
      build_id = build_ref.buildsId

    location = None
    if hasattr(build_ref, 'locationsId'):
      location = build_ref.locationsId

    if location is not None:
      cancel_name = 'projects/{project}/locations/{location}/builds/{buildId}'
      name = cancel_name.format(
          project=project_id, location=location, buildId=build_id)
      client.projects_locations_builds.Cancel(
          messages.CancelBuildRequest(
              name=name))
    else:
      client.projects_builds.Cancel(
          messages.CloudbuildProjectsBuildsCancelRequest(
              projectId=project_id, id=build_id))

    log.status.Print('Cancelled [{r}].'.format(r=six.text_type(build_ref)))
  return _CancelBuildHandler