#!/usr/bin/env python
# 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 argparse
import hashlib
import logging
import os
import shutil
import subprocess
import sys
import urllib
import zipfile

from collections import namedtuple

# When adding a new git dependency here please also add a corresponding entry in
# .travis.yml under the "cache:" section.

# The format for the deps below is the following:
# (target_folder, source_url, sha1, target_platform)
# |source_url| can be either a git repo or a http url.
# If a git repo, |sha1| is the committish that will be checked out.
# If a http url, |sha1| is the shasum of the original file.
# If the url is a .zip or .tgz file it will be automatically deflated under
# |target_folder|, taking care of stripping the root folder if it's a single
# root (to avoid ending up with buildtools/protobuf/protobuf-1.2.3/... and have
# instead just buildtools/protobuf).
# |target_platform| is either 'darwin', 'linux2' or 'all' and applies the dep
# only on the given platform (ask python why linux2 and not just linux).

# Dependencies required to build code on the host or when targeting desktop OS.
BUILD_DEPS_HOST = [
  # GN
  ('buildtools/mac/gn',
   'https://storage.googleapis.com/chromium-gn/c2c934d4dda1f470a6511b1015dda9a9fb1ce50b',
   'c2c934d4dda1f470a6511b1015dda9a9fb1ce50b',
   'darwin'
  ),
  ('buildtools/linux64/gn',
   'https://storage.googleapis.com/chromium-gn/b53fa13e950948c6f9a062189b76b34a9610281f',
   'b53fa13e950948c6f9a062189b76b34a9610281f',
   'linux2'
  ),

  # clang-format
  ('buildtools/mac/clang-format',
   'https://storage.googleapis.com/chromium-clang-format/0679b295e2ce2fce7919d1e8d003e497475f24a3',
   '0679b295e2ce2fce7919d1e8d003e497475f24a3',
   'darwin'
  ),
  ('buildtools/linux64/clang-format',
   'https://storage.googleapis.com/chromium-clang-format/5349d1954e17f6ccafb6e6663b0f13cdb2bb33c8',
   '5349d1954e17f6ccafb6e6663b0f13cdb2bb33c8',
   'linux2'
  ),
  # Keep the SHA1 in sync with |clang_format_rev| in chromium //buildtools/DEPS.
  ('buildtools/clang_format/script',
   'https://chromium.googlesource.com/chromium/llvm-project/cfe/tools/clang-format.git',
   '0653eee0c81ea04715c635dd0885e8096ff6ba6d',
   'all'
  ),

  # Ninja
  ('buildtools/mac/ninja',
   'https://storage.googleapis.com/fuchsia-build/fuchsia/ninja/mac/a1db595e824c50cf565fbf0af2437fd91b7babf4',
   'a1db595e824c50cf565fbf0af2437fd91b7babf4',
   'darwin'
  ),
  ('buildtools/linux64/ninja',
   'https://storage.googleapis.com/fuchsia-build/fuchsia/ninja/linux64/d35b36c84a09f7e38b25947cafada10e8bf835bc',
   'd35b36c84a09f7e38b25947cafada10e8bf835bc',
   'linux2'
  ),

  # Keep in sync with Android's //external/googletest/README.version.
  ('buildtools/googletest.zip',
   'https://github.com/google/googletest/archive/ff07a5de0e81580547f1685e101194ed1a4fcd56.zip',
   'c7edec7d7e6db1fc37a20710de9c4d89e3a3893b',
   'all'
  ),

  # Keep in sync with Android's //external/protobuf/README.version.
  ('buildtools/protobuf.zip',
   'https://github.com/google/protobuf/releases/download/v3.0.0-beta-3/protobuf-cpp-3.0.0-beta-3.zip',
   '3caec60aa9d8eefc8c3c3201b6b8ca19935edb89',
   'all'
  ),

  # libc++, libc++abi and libunwind for Linux where we need to rebuild the C++
  # lib from sources. Keep the SHA1s in sync with Chrome's src/buildtools/DEPS.
  ('buildtools/libcxx',
   'https://chromium.googlesource.com/chromium/llvm-project/libcxx.git',
   '3a07dd740be63878167a0ea19fe81869954badd7',
   'all'
  ),
  ('buildtools/libcxxabi',
   'https://chromium.googlesource.com/chromium/llvm-project/libcxxabi.git',
   '4072e8fd76febee37f60aeda76d6d9f5e3791daa',
   'all'
  ),
  ('buildtools/libunwind',
   'https://chromium.googlesource.com/external/llvm.org/libunwind.git',
   '41f982e5887185b904a456e20dfcd58e6be6cc19',
   'all'
  ),

  # Keep the revision in sync with Chrome's CLANG_REVISION in
  # tools/clang/scripts/update.py.
  ('buildtools/clang.tgz',
   'https://commondatastorage.googleapis.com/chromium-browser-clang/Linux_x64/clang-321529-1.tgz',
   '7ca04034ac7e4a956b0084a8bc604bacab94af26',
   'linux2'
  ),

  # Benchmarking tool.
  ('buildtools/benchmark.zip',
   'https://github.com/google/benchmark/archive/v1.2.0.zip',
   '553b6bfa59c63f15c54cfd8c5122b0f7f84469af',
   'all'
  ),
]

# Dependencies required to build Android code.
# URLs and SHA1s taken from:
# - https://dl.google.com/android/repository/repository-11.xml
# - https://dl.google.com/android/repository/sys-img/android/sys-img.xml
BUILD_DEPS_ANDROID = [
  # Android NDK
  ('buildtools/ndk.zip',
   'https://dl.google.com/android/repository/android-ndk-r15c-darwin-x86_64.zip',
   'ea4b5d76475db84745aa8828000d009625fc1f98',
   'darwin'
  ),
  ('buildtools/ndk.zip',
   'https://dl.google.com/android/repository/android-ndk-r15c-linux-x86_64.zip',
   '0bf02d4e8b85fd770fd7b9b2cdec57f9441f27a2',
   'linux2'
  ),
]

# Dependencies required to run Android tests.
TEST_DEPS_ANDROID = [
  # Android emulator images.
  ('buildtools/aosp-arm.zip',
   'https://storage.googleapis.com/perfetto/aosp-02022018-arm.zip',
   'a480d5e7d3ca888b0a58fe15ce76b1791537429a',
   'linux2'
  ),

  # platform-tools.zip contains adb binaries.
  ('buildtools/android_sdk/platform-tools.zip',
   'https://dl.google.com/android/repository/platform-tools_r26.0.0-darwin.zip',
   'e75b6137dc444f777eb02f44a6d9819b3aabff82',
   'darwin'
  ),
  ('buildtools/android_sdk/platform-tools.zip',
   'https://dl.google.com/android/repository/platform-tools_r26.0.0-linux.zip',
   '00de8a6631405b617c10f68cd11ff2e1cd528e23',
   'linux2'
  ),

  # Android emulator binaries.
  ('buildtools/emulator',
   'https://android.googlesource.com/platform/prebuilts/android-emulator.git',
   '4b260028dc27bc92c39bee9129cb2ba839970956',
   'all'
  ),
]

ROOT_DIR = os.path.dirname(os.path.dirname(os.path.abspath(__file__)))


def ReadFile(path):
  if not os.path.exists(path):
    return None
  with open(path) as f:
      return f.read().strip()


def MkdirRecursive(path):
  # Works with both relative and absolute paths
  cwd = '/' if path.startswith('/') else ROOT_DIR
  for part in path.split('/'):
    cwd = os.path.join(cwd, part)
    if not os.path.exists(cwd):
      os.makedirs(cwd)
    else:
      assert(os.path.isdir(cwd))


def HashLocalFile(path):
  if not os.path.exists(path):
    return None
  with open(path, 'rb') as f:
    return hashlib.sha1(f.read()).hexdigest()


def ExtractZipfilePreservePermissions(zf, info, path):
  zf.extract(info.filename, path=path)
  target_path = os.path.join(path, info.filename)
  min_acls = 0o755 if info.filename.endswith('/') else 0o644
  os.chmod(target_path, (info.external_attr >> 16L) | min_acls)


def IsGitRepoCheckoutOutAtRevision(path, revision):
  return ReadFile(os.path.join(path, '.git', 'HEAD')) == revision


def CheckoutGitRepo(path, git_url, revision):
  if IsGitRepoCheckoutOutAtRevision(path, revision):
    return
  if os.path.exists(path):
    shutil.rmtree(path)
  MkdirRecursive(path)
  logging.info('Fetching %s @ %s into %s', git_url, revision, path)
  subprocess.check_call(['git', 'init', path], cwd=path)
  subprocess.check_call(
    ['git', 'fetch', '--depth', '1', git_url, revision], cwd=path)
  subprocess.check_call(['git', 'checkout', revision, '--quiet'], cwd=path)
  assert(IsGitRepoCheckoutOutAtRevision(path, revision))


def Main():
  parser = argparse.ArgumentParser()
  parser.add_argument('--no-android', action='store_true')
  args = parser.parse_args()
  deps = BUILD_DEPS_HOST
  if not args.no_android:
    deps += BUILD_DEPS_ANDROID + TEST_DEPS_ANDROID
  for rel_path, url, expected_sha1, platform in deps:
    if (platform != 'all' and platform != sys.platform):
      continue
    local_path = os.path.join(ROOT_DIR, rel_path)
    if url.endswith('.git'):
      CheckoutGitRepo(local_path, url, expected_sha1)
      continue
    is_zip = local_path.endswith('.zip') or local_path.endswith('.tgz')
    zip_target_dir = local_path[:-4] if is_zip else None
    zip_dir_stamp = os.path.join(zip_target_dir, '.stamp') if is_zip else None

    if ((not is_zip and HashLocalFile(local_path) == expected_sha1) or
        (is_zip and ReadFile(zip_dir_stamp) == expected_sha1)):
      continue
    MkdirRecursive(os.path.dirname(rel_path))
    if HashLocalFile(local_path) != expected_sha1:
      download_path = local_path + '.tmp'
      logging.info('Downloading %s from %s', local_path, url)
      urllib.urlretrieve(url, download_path)
      os.chmod(download_path, 0o755)
      if (HashLocalFile(download_path) != expected_sha1):
        os.remove(download_path)
        logging.fatal('SHA1 mismatch for %s', download_path)
        return 1
      os.rename(download_path, local_path)
    assert(HashLocalFile(local_path) == expected_sha1)

    if is_zip:
      logging.info('Extracting %s into %s' % (local_path, zip_target_dir))
      assert(os.path.commonprefix((ROOT_DIR, zip_target_dir)) == ROOT_DIR)
      if os.path.exists(zip_target_dir):
        logging.info('Deleting stale dir %s' % zip_target_dir)
        shutil.rmtree(zip_target_dir)

      # Decompress the archive.
      if local_path.endswith('.tgz'):
        MkdirRecursive(zip_target_dir)
        subprocess.check_call(['tar', '-zxf', local_path], cwd=zip_target_dir)
      elif local_path.endswith('.zip'):
        with zipfile.ZipFile(local_path, 'r') as zf:
          for info in zf.infolist():
            ExtractZipfilePreservePermissions(zf, info, zip_target_dir)

      # If the zip contains one root folder, rebase one level up moving all
      # its sub files and folders inside |target_dir|.
      subdir = os.listdir(zip_target_dir)
      if len(subdir) == 1:
        subdir = os.path.join(zip_target_dir, subdir[0])
        if os.path.isdir(subdir):
          for subf in os.listdir(subdir):
            shutil.move(os.path.join(subdir,subf), zip_target_dir)
          os.rmdir(subdir)

      # Create stamp and remove the archive.
      with open(zip_dir_stamp, 'w') as stamp_file:
        stamp_file.write(expected_sha1)
      os.remove(local_path)


if __name__ == '__main__':
  logging.basicConfig(level=logging.INFO)
  sys.exit(Main())