#!/usr/bin/env vpython3
# Copyright (c) 2022 The WebRTC project authors. All Rights Reserved.
#
# Use of this source code is governed by a BSD-style license
# that can be found in the LICENSE file in the root of the source
# tree. An additional intellectual property rights grant can be found
# in the file PATENTS.  All contributing project authors may
# be found in the AUTHORS file in the root of the source tree.
"""Script to generate the test spec JSON files and the mixins.pyl file from the
ADDITIONAL_MIXINS dictonary. Calls Chromium's generate_buildbot_json.
"""

import ast
import os
import subprocess
import sys

_SCRIPT_DIR = os.path.dirname(os.path.realpath(__file__))
_SRC_DIR = os.path.dirname(os.path.dirname(_SCRIPT_DIR))
sys.path.insert(0, _SRC_DIR)
sys.path.insert(0, os.path.join(_SRC_DIR, 'testing', 'buildbot'))

from testing.buildbot import generate_buildbot_json

# Add custom mixins here.
WEBRTC_MIXIN_FILE_NAME = os.path.join(_SCRIPT_DIR, 'mixins_webrtc.pyl')
MIXIN_FILE_NAME = os.path.join(_SCRIPT_DIR, 'mixins.pyl')
MIXINS_PYL_TEMPLATE = """\
# GENERATED FILE - DO NOT EDIT.
# Generated by {script_name} using data from
# {data_source}
#
# Copyright (c) 2022 The WebRTC project authors. All Rights Reserved.
#
# Use of this source code is governed by a BSD-style license
# that can be found in the LICENSE file in the root of the source
# tree. An additional intellectual property rights grant can be found
# in the file PATENTS.  All contributing project authors may
# be found in the AUTHORS file in the root of the source tree.

{mixin_data}
"""


def generate_mixins_file_from_used_mixins(generator):
  chromium_args = generate_buildbot_json.BBJSONGenerator.parse_args(argv=None)
  chromium_generator = generate_buildbot_json.BBJSONGenerator(chromium_args)
  chromium_generator.load_configuration_files()

  seen_mixins = set()
  for waterfall in generator.waterfalls:
    seen_mixins = seen_mixins.union(waterfall.get('mixins', set()))
    for bot_name, tester in waterfall['machines'].items():
      del bot_name
      seen_mixins = seen_mixins.union(tester.get('mixins', set()))
  for suite in generator.test_suites.values():
    for test in suite.values():
      if isinstance(test, list):
        # This is for mixins defined in variants.pyl.
        for variant in test:
          seen_mixins = seen_mixins.union(variant.get('mixins', set()))
      else:
        seen_mixins = seen_mixins.union(test.get('mixins', set()))

  found_mixins = ast.literal_eval(open(WEBRTC_MIXIN_FILE_NAME).read())
  for mixin in seen_mixins:
    if mixin not in found_mixins:
      found_mixins[mixin] = chromium_generator.mixins[mixin]
    elif mixin in chromium_generator.mixins:
      assert False, '"%s" is already defined in Chromium\'s mixins.pyl' % mixin

  format_data = {
      'script_name': os.path.basename(__file__),
      'data_source': 'mixins_webrtc.pyl and Chromium\'s mixins.pyl',
      'mixin_data': dict(sorted(found_mixins.items())),
  }
  with open(MIXIN_FILE_NAME, 'w') as f:
    f.write(MIXINS_PYL_TEMPLATE.format(**format_data))

  return subprocess.call(['yapf', '-i', MIXIN_FILE_NAME])


def main():
  override_args = ['--pyl-files-dir', _SCRIPT_DIR]
  webrtc_args = generate_buildbot_json.BBJSONGenerator.parse_args(override_args)
  webrtc_generator = generate_buildbot_json.BBJSONGenerator(webrtc_args)
  webrtc_generator.load_configuration_files()
  webrtc_generator.resolve_configuration_files()

  generate_mixins_file_from_used_mixins(webrtc_generator)
  return webrtc_generator.main()


if __name__ == '__main__':  # pragma: no cover
  sys.exit(main())