#!/usr/bin/env python3

# Copyright 2023 Google Inc.
#
# Use of this source code is governed by a BSD-style license that can be
# found in the LICENSE file.

import hashlib
import json
import os
import platform
import re
import stat
import sys
import tempfile
import zipfile

from urllib.request import urlopen

TESTDATA_REL_DIR = 'third_party/externals/googlefonts_testdata'
ZIP_ARCHIVE_NAME = 'googlefonts_testdata.zip'
VERSION_FILE = 'googlefonts_testdata.version'

def sha256sum(path):
  try:
    with open(path, 'rb') as f:
      return hashlib.sha256(f.read()).hexdigest()
  except OSError:
    return ''


os.chdir(os.path.join(os.path.dirname(__file__), os.pardir))

with open('DEPS', 'rb') as f:
  deps = f.read().decode()
found = re.findall(r"'googlefonts_testdata_version':\s*'(\S+)'", deps)
if len(found) != 1:
  print('Unable to find desired revision in DEPS', file=sys.stderr)
  exit(1)
desired_version = found[0]

# Determine which version (if any) we currently have.
zip_archive_path = os.path.join(TESTDATA_REL_DIR, ZIP_ARCHIVE_NAME)
current_sha256 = sha256sum(zip_archive_path)
archive_version_path = os.path.join(TESTDATA_REL_DIR, VERSION_FILE)

current_version = {
  'version': '',
  'sha256': '',
}
try:
  with open(archive_version_path, 'r', encoding='utf8') as f:
    current_version = json.load(f)
except OSError:
  pass

if desired_version != current_version['version']:
  print('Version "%s" requested by DEPS differs from current version "%s"' % (
      desired_version, current_version['version']))
elif current_sha256 != current_version['sha256']:
  print('sha256 sum "%s" does not match last-downloaded version "%s"' % (
      current_sha256, current_version['sha256']))
else:
  print('Already up to date.')
  exit(0)

print('Fetching %s at %s.' % (ZIP_ARCHIVE_NAME, desired_version))

os.makedirs(os.path.dirname(zip_archive_path), exist_ok=True)
with open(zip_archive_path, 'wb') as f:
  url = f'https://chrome-infra-packages.appspot.com/dl/chromium/third_party/googlefonts_testdata/+/{desired_version}'
  f.write(urlopen(url).read())

with zipfile.ZipFile(zip_archive_path, 'r') as f:
  f.extractall(TESTDATA_REL_DIR)

# Write the downloaded version info to a file.
current_version['version'] = desired_version
current_version['sha256'] = sha256sum(zip_archive_path)
with open(archive_version_path, 'w', encoding='utf8') as f:
  json.dump(current_version, f, sort_keys=True, indent=2)