# Copyright (C) 2017 The Android Open Source Project
#
# 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.

import itertools
import subprocess


def CheckChange(input, output):
  # There apparently is no way to wrap strings in blueprints, so ignore long
  # lines in them.
  def long_line_sources(x): return input.FilterSourceFile(
      x, white_list=".*",
      black_list=['Android[.]bp', '.*[.]json$', '.*[.]sql$', '.*[.]out$',
                  'test/trace_processor/index$', 'BUILD$', 'protos/BUILD$'])
  results = []
  results += input.canned_checks.CheckDoNotSubmit(input, output)
  results += input.canned_checks.CheckChangeHasNoTabs(input, output)
  results += input.canned_checks.CheckLongLines(
      input, output, 80, source_file_filter=long_line_sources)
  results += input.canned_checks.CheckPatchFormatted(
      input, output, check_js=True)
  results += input.canned_checks.CheckGNFormatted(input, output)
  results += CheckIncludeGuards(input, output)
  results += CheckIncludeViolations(input, output)
  results += CheckBuild(input, output)
  results += CheckAndroidBlueprint(input, output)
  results += CheckBinaryDescriptors(input, output)
  results += CheckMergedTraceConfigProto(input, output)
  results += CheckWhitelist(input, output)
  return results


def CheckChangeOnUpload(input_api, output_api):
  return CheckChange(input_api, output_api)


def CheckChangeOnCommit(input_api, output_api):
  return CheckChange(input_api, output_api)


def CheckBuild(input_api, output_api):
  # If no GN files were modified, bail out.
  def build_file_filter(x): return input_api.FilterSourceFile(
      x,
      white_list=('.*BUILD[.]gn$', '.*[.]gni$', 'tools/gen_bazel'))
  if not input_api.AffectedSourceFiles(build_file_filter):
    return []

  with open('BUILD') as f:
    current_build = f.read()

  new_build = subprocess.check_output(
      ['tools/gen_bazel', '--output', '/dev/stdout', '--output-proto',
       '/dev/null'])

  with open('protos/BUILD') as f:
    current_proto_build = f.read()

  new_proto_build = subprocess.check_output(
      ['tools/gen_bazel', '--output', '/dev/null', '--output-proto',
       '/dev/stdout'])

  if current_build != new_build or current_proto_build != new_proto_build:
    return [
        output_api.PresubmitError(
            'BUILD and/or protos/BUILD is out of date. ' +
            'Please run tools/gen_bazel to update it.')
    ]
  return []


def CheckAndroidBlueprint(input_api, output_api):
  # If no GN files were modified, bail out.
  def build_file_filter(x): return input_api.FilterSourceFile(
      x,
      white_list=('.*BUILD[.]gn$', '.*[.]gni$', 'tools/gen_android_bp'))
  if not input_api.AffectedSourceFiles(build_file_filter):
    return []

  with open('Android.bp') as f:
    current_blueprint = f.read()

  new_blueprint = subprocess.check_output(
      ['tools/gen_android_bp', '--output', '/dev/stdout'])

  if current_blueprint != new_blueprint:
    return [
        output_api.PresubmitError(
            'Android.bp is out of date. Please run tools/gen_android_bp '
            'to update it.')
    ]
  return []


def CheckIncludeGuards(input_api, output_api):
  tool = 'tools/fix_include_guards'

  def file_filter(x): return input_api.FilterSourceFile(
      x,
      white_list=['.*[.]cc$', '.*[.]h$', tool])
  if not input_api.AffectedSourceFiles(file_filter):
    return []
  if subprocess.call([tool, '--check-only']):
    return [
        output_api.PresubmitError(
            'Please run ' + tool + ' to fix include guards.')
    ]
  return []


def CheckIncludeViolations(input_api, output_api):
  tool = 'tools/check_include_violations'

  def file_filter(x): return input_api.FilterSourceFile(
      x,
      white_list=['include/.*[.]h$', tool])
  if not input_api.AffectedSourceFiles(file_filter):
    return []
  if subprocess.call([tool]):
    return [output_api.PresubmitError(tool + ' failed.')]
  return []


def CheckBinaryDescriptors(input_api, output_api):
  tool = 'tools/gen_binary_descriptors'

  def file_filter(x): return input_api.FilterSourceFile(
      x,
      white_list=['protos/perfetto/.*[.]proto$', '.*[.]h', tool])
  if not input_api.AffectedSourceFiles(file_filter):
    return []
  if subprocess.call([tool, '--check-only']):
    return [
        output_api.PresubmitError(
            'Please run ' + tool + ' to update binary descriptors.')
    ]
  return []


def CheckMergedTraceConfigProto(input_api, output_api):
  tool = 'tools/gen_merged_protos'

  def build_file_filter(x): return input_api.FilterSourceFile(
      x,
      white_list=['protos/perfetto/.*[.]proto$', tool])
  if not input_api.AffectedSourceFiles(build_file_filter):
    return []
  if subprocess.call([tool, '--check-only']):
    return [
        output_api.PresubmitError(
            'perfetto_config.proto or perfetto_trace.proto is out of ' +
            'date. Please run ' + tool + ' to update it.')
    ]
  return []


# Prevent removing or changing lines in event_whitelist.
def CheckWhitelist(input_api, output_api):
  for f in input_api.AffectedFiles():
    if f.LocalPath() != 'tools/ftrace_proto_gen/event_whitelist':
      continue
    if any((not new_line.startswith('removed'))
            and new_line != old_line for old_line, new_line
           in itertools.izip(f.OldContents(), f.NewContents())):
      return [
          output_api.PresubmitError(
              'event_whitelist only has two supported changes: '
              'appending a new line, and replacing a line with removed.'
          )
      ]
  return []