# Copyright 2020 The Chromium Authors
# Use of this source code is governed by a BSD-style license that can be
# found in the LICENSE file.

"""Chromium presubmit script for src/components/autofill.

See http://dev.chromium.org/developers/how-tos/depottools/presubmit-scripts
for more details on the presubmit API built into depot_tools.
"""

USE_PYTHON3 = True

def _CheckNoBaseTimeCalls(input_api, output_api):
  """Checks that no files call base::Time::Now() or base::TimeTicks::Now()."""
  pattern = input_api.re.compile(
      r'(base::(Time|TimeTicks)::Now)\(\)',
      input_api.re.MULTILINE)
  files = []
  for f in input_api.AffectedSourceFiles(input_api.FilterSourceFile):
    if (f.LocalPath().startswith('components/autofill/') and
        not f.LocalPath().endswith("PRESUBMIT.py")):
      contents = input_api.ReadFile(f)
      if pattern.search(contents):
        files.append(f)

  if len(files):
    return [ output_api.PresubmitPromptWarning(
        'Consider to not call base::Time::Now() or base::TimeTicks::Now() ' +
        'directly but use AutofillClock::Now() and '+
        'Autofill::TickClock::NowTicks(), respectively. These clocks can be ' +
        'manipulated through TestAutofillClock and TestAutofillTickClock '+
        'for testing purposes, and using AutofillClock and AutofillTickClock '+
        'throughout Autofill code makes sure Autofill tests refers to the '+
        'same (potentially manipulated) clock.',
        files) ]
  return []

def _CheckNoServerFieldTypeCasts(input_api, output_api):
  """Checks that no files cast (e.g., raw integers to) ServerFieldTypes."""
  pattern = input_api.re.compile(
      r'_cast<\s*ServerFieldType\b',
      input_api.re.MULTILINE)
  files = []
  for f in input_api.AffectedSourceFiles(input_api.FilterSourceFile):
    if (f.LocalPath().startswith('components/autofill/') and
        not f.LocalPath().endswith("PRESUBMIT.py")):
      contents = input_api.ReadFile(f)
      if pattern.search(contents):
        files.append(f)

  if len(files):
    return [ output_api.PresubmitPromptWarning(
        'Do not cast raw integers to ServerFieldType to prevent values that ' +
        'have no corresponding enum constant or are deprecated. Use '+
        'ToSafeServerFieldType() instead.',
        files) ]
  return []

def _CheckFeatureNames(input_api, output_api):
  """Checks that no features are enabled."""

  pattern = input_api.re.compile(
          r'\bBASE_FEATURE\s*\(\s*k(\w*)\s*,\s*"(\w*)"',
          input_api.re.MULTILINE)
  warnings = []

  def exception(constant, feature):
    if constant == "AutofillAddressEnhancementVotes" and \
       feature == "kAutofillAddressEnhancementVotes":
      return True
    return False

  for f in input_api.AffectedSourceFiles(input_api.FilterSourceFile):
    if (f.LocalPath().startswith('components/autofill/') and
        f.LocalPath().endswith('features.cc')):
      contents = input_api.ReadFile(f)
      mismatches = [(constant, feature)
              for (constant, feature) in pattern.findall(contents)
              if constant != feature and not exception(constant, feature)]
      if mismatches:
        mismatch_strings = ['\t{} -- {}'.format(*m) for m in mismatches]
        mismatch_string = format('\n').join(mismatch_strings)
        warnings += [ output_api.PresubmitPromptWarning(
            'Feature names should be identical to variable names:\n{}'
                .format(mismatch_string),
            [f]) ]

  return warnings

def _CheckWebViewExposedExperiments(input_api, output_api):
  """Checks that changes to autofill features are exposed to webview."""

  _PRODUCTION_SUPPORT_FILE = ('android_webview/java/src/org/chromium/' +
      'android_webview/common/ProductionSupportedFlagList.java')
  _GENERATE_FLAG_LABELS_PY = 'android_webview/tools/generate_flag_labels.py'

  def is_autofill_features_file(f):
    return (f.LocalPath().startswith('components/autofill/') and
        f.LocalPath().endswith('features.cc'))

  def is_webview_features_file(f):
    return f.LocalPath() == _PRODUCTION_SUPPORT_FILE

  def any_file_matches(matcher):
    return any(matcher(f) for f in input_api.change.AffectedTestableFiles())

  warnings = []
  if (any_file_matches(is_autofill_features_file)
      and not any_file_matches(is_webview_features_file)):
    warnings += [
        output_api.PresubmitPromptWarning((
            'You may need to modify {} and run {} and follow its '+
            'instructions if your feature affects WebView.'
        ).format(_PRODUCTION_SUPPORT_FILE, _GENERATE_FLAG_LABELS_PY))
    ]

  return warnings

def _CommonChecks(input_api, output_api):
  """Checks common to both upload and commit."""
  results = []
  results.extend(_CheckNoBaseTimeCalls(input_api, output_api))
  results.extend(_CheckNoServerFieldTypeCasts(input_api, output_api))
  results.extend(_CheckFeatureNames(input_api, output_api))
  results.extend(_CheckWebViewExposedExperiments(input_api, output_api))
  return results

def CheckChangeOnUpload(input_api, output_api):
  results = []
  results.extend(_CommonChecks(input_api, output_api))
  return results

def CheckChangeOnCommit(input_api, output_api):
  results = []
  results.extend(_CommonChecks(input_api, output_api))
  return results