#!/usr/bin/env python3
# Copyright (C) 2024 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 argparse
import os
import sys
import subprocess

UI_DIR = os.path.abspath(os.path.dirname(__file__))
ROOT_DIR = os.path.dirname(UI_DIR)
PRETTIER_PATH = os.path.join(ROOT_DIR, 'ui/node_modules/.bin/prettier')
ESLINT_PATH = os.path.join(ROOT_DIR, 'ui/node_modules/.bin/eslint')


def main():
  parser = argparse.ArgumentParser()
  parser.add_argument('--check-only', action='store_true')
  parser.add_argument('--no-prettier', action='store_true')
  parser.add_argument('--no-eslint', action='store_true')
  parser.add_argument(
      '--all',
      action='store_true',
      help='Prettify all .ts sources, not just the changed ones')
  parser.add_argument('filelist', nargs='*')
  args = parser.parse_args()

  # We want to execute all the commands relative to UI_DIR, because eslint looks
  # for eslintrc in cwd. However, the user might pass paths that are relative to
  # the current cwd, which might be != UI_DIR.
  # So before running chdir relativize all the passed paths to UI_DIR
  filelist = [
      os.path.relpath(os.path.abspath(x), UI_DIR) for x in args.filelist
  ]
  os.chdir(UI_DIR)

  # Need to add 'node' to the search path.
  os.environ['PATH'] += os.pathsep + os.path.join(ROOT_DIR, 'tools')

  if not os.path.exists(PRETTIER_PATH):
    print('Cannot find %s' % PRETTIER_PATH)
    print('Run tools/install-build-deps --ui')
    return 1

  with open('.prettierignore', 'r') as f:
    ignorelist = set(f.read().strip().split('\n'))

  all_files = set()
  for root, _dirs, files in os.walk('src'):
    if root in ignorelist:
      continue
    for file in files:
      file_path = os.path.join(root, file)
      if os.path.splitext(file)[1].lower() in ['.ts', '.js', '.scss']:
        all_files.add(file_path)

  files_to_check = []
  git_cmd = []
  if args.all:
    files_to_check = list(all_files)
  elif filelist:
    files_to_check = filelist
  else:
    upstream_branch = get_upstream_branch()
    git_cmd = ['git', 'diff', '--name-only', upstream_branch]
    git_output = subprocess.check_output(git_cmd, text=True).strip()
    changed_files = set(git_output.split('\n') if git_output else [])
    changed_files = [os.path.relpath(x, 'ui') for x in changed_files]
    files_to_check = all_files.intersection(changed_files)

  prettier_args = ['--log-level=warn']
  eslint_args = []
  if args.check_only:
    prettier_args += ['--check']
  else:
    eslint_args += ['--fix']
    prettier_args += ['--write']

  if len(files_to_check) == 0:
    if not args.check_only:
      # Be quiet when invoked by git cl presubmit.
      print('No changed files detected by `%s`' % ' '.join(git_cmd))
      print('Pass --all to prettify all ts/js/scss files in the repo')
    return 0

  # Run prettier first
  if not args.no_prettier:
    print('Running prettier on %d files' % len(files_to_check))
    call_or_die([PRETTIER_PATH] + prettier_args + list(files_to_check))

  # Then run eslint (but not on .scss)
  if not args.no_eslint:
    ts_js_only = lambda f: f.endswith('.ts') or f.endswith('.js')
    files_to_check = list(filter(ts_js_only, files_to_check))
    if len(files_to_check) > 0:
      print('Running eslint on %d files' % len(files_to_check))
      call_or_die([ESLINT_PATH] + eslint_args + files_to_check)


# Like subprocess.check_call, but in case of errors dies without printing a
# useless stacktrace that just muddies the stdout.
def call_or_die(cmd):
  try:
    subprocess.check_call(cmd)
  except subprocess.CalledProcessError as ex:
    print('`%s` returned %d' % (' '.join(cmd)[:128], ex.returncode))
    sys.exit(ex.returncode)


def get_upstream_branch():
  try:
    cmd = ['git', 'rev-parse', '--abbrev-ref', '--symbolic-full-name', '@{u}']
    res = subprocess.check_output(cmd, text=True, stderr=subprocess.DEVNULL)
    return res.strip()
  except subprocess.CalledProcessError:
    return 'origin/main'


if __name__ == '__main__':
  sys.exit(main())