# Copyright 2014 The Chromium Authors. All rights reserved.
# Use of this source code is governed by a BSD-style license that can be
# found in the LICENSE file.

"""
From a system-installed copy of the toolchain, packages all the required bits
into a .zip file.

It assumes default install locations for tools, in particular:
- C:\Program Files (x86)\Microsoft Visual Studio 12.0\...
- C:\Program Files (x86)\Windows Kits\8.1\...

1. Start from a fresh Win7 VM image.
2. Install VS Pro. Deselect everything except MFC.
3. Install Windows 8 SDK. Select only the Windows SDK and Debugging Tools for
Windows.
4. Run this script, which will build a <sha1>.zip.

Express is not yet supported by this script, but patches welcome (it's not too
useful as the resulting zip can't be redistributed, and most will presumably
have a Pro license anyway).
"""

import os
import shutil
import sys
import tempfile
import zipfile

import get_toolchain_if_necessary


VS_VERSION = None


def BuildFileList():
  result = []

  # Subset of VS corresponding roughly to VC.
  paths = [
      'DIA SDK/bin',
      'DIA SDK/idl',
      'DIA SDK/include',
      'DIA SDK/lib',
      'VC/atlmfc',
      'VC/bin',
      'VC/crt',
      'VC/include',
      'VC/lib',
      'VC/redist',
  ]

  if VS_VERSION == '2013':
    paths += [
        ('VC/redist/x86/Microsoft.VC120.CRT', 'sys32'),
        ('VC/redist/x86/Microsoft.VC120.MFC', 'sys32'),
        ('VC/redist/Debug_NonRedist/x86/Microsoft.VC120.DebugCRT', 'sys32'),
        ('VC/redist/Debug_NonRedist/x86/Microsoft.VC120.DebugMFC', 'sys32'),
        ('VC/redist/x64/Microsoft.VC120.CRT', 'sys64'),
        ('VC/redist/x64/Microsoft.VC120.MFC', 'sys64'),
        ('VC/redist/Debug_NonRedist/x64/Microsoft.VC120.DebugCRT', 'sys64'),
        ('VC/redist/Debug_NonRedist/x64/Microsoft.VC120.DebugMFC', 'sys64'),
    ]
  elif VS_VERSION == '2015':
    paths += [
        ('VC/redist/x86/Microsoft.VC140.CRT', 'sys32'),
        ('VC/redist/x86/Microsoft.VC140.MFC', 'sys32'),
        ('VC/redist/debug_nonredist/x86/Microsoft.VC140.DebugCRT', 'sys32'),
        ('VC/redist/debug_nonredist/x86/Microsoft.VC140.DebugMFC', 'sys32'),
        ('VC/redist/x64/Microsoft.VC140.CRT', 'sys64'),
        ('VC/redist/x64/Microsoft.VC140.MFC', 'sys64'),
        ('VC/redist/debug_nonredist/x64/Microsoft.VC140.DebugCRT', 'sys64'),
        ('VC/redist/debug_nonredist/x64/Microsoft.VC140.DebugMFC', 'sys64'),
    ]
  else:
    raise ValueError('VS_VERSION %s' % VS_VERSION)

  if VS_VERSION == '2013':
    vs_path = r'C:\Program Files (x86)\Microsoft Visual Studio 12.0'
  else:
    vs_path = r'C:\Program Files (x86)\Microsoft Visual Studio 14.0'

  for path in paths:
    src = path[0] if isinstance(path, tuple) else path
    combined = os.path.join(vs_path, src)
    assert os.path.exists(combined) and os.path.isdir(combined)
    for root, _, files in os.walk(combined):
      for f in files:
        final_from = os.path.normpath(os.path.join(root, f))
        if isinstance(path, tuple):
          result.append(
              (final_from, os.path.normpath(os.path.join(path[1], f))))
        else:
          assert final_from.startswith(vs_path)
          dest = final_from[len(vs_path) + 1:]
          if VS_VERSION == '2013' and dest.lower().endswith('\\xtree'):
            # Patch for C4702 in xtree on VS2013. http://crbug.com/346399.
            (handle, patched) = tempfile.mkstemp()
            with open(final_from, 'rb') as unpatched_f:
              unpatched_contents = unpatched_f.read()
            os.write(handle,
                unpatched_contents.replace('warning(disable: 4127)',
                                           'warning(disable: 4127 4702)'))
            result.append((patched, dest))
          else:
            result.append((final_from, dest))

  # Just copy the whole SDK.
  sdk_path = r'C:\Program Files (x86)\Windows Kits\8.1'
  for root, _, files in os.walk(sdk_path):
    for f in files:
      combined = os.path.normpath(os.path.join(root, f))
      to = os.path.join('win_sdk', combined[len(sdk_path) + 1:])
      result.append((combined, to))

  if VS_VERSION == '2015':
    for ucrt_path in (
        (r'C:\Program Files (x86)\Windows Kits\10\Include', 'Include'),
        (r'C:\Program Files (x86)\Windows Kits\10\Lib', 'Lib'),
        (r'C:\Program Files (x86)\Windows Kits\10\Source', 'Source')):
      src, target = ucrt_path
      for root, _, files in os.walk(src):
        for f in files:
          combined = os.path.normpath(os.path.join(root, f))
          to = os.path.join('ucrt', target, combined[len(src) + 1:])
          result.append((combined, to))

  # Generically drop all arm stuff that we don't need.
  return [(f, t) for f, t in result if 'arm\\' not in f.lower() and
                                       'arm64\\' not in f.lower()]


def GenerateSetEnvCmd(target_dir):
  """Generate a batch file that gyp expects to exist to set up the compiler
  environment.

  This is normally generated by a full install of the SDK, but we
  do it here manually since we do not do a full install."""
  with open(os.path.join(
        target_dir, r'win_sdk\bin\SetEnv.cmd'), 'w') as f:
    f.write('@echo off\n'
            ':: Generated by win_toolchain\\package_from_installed.py.\n'
            # Common to x86 and x64
            'set PATH=%~dp0..\\..\\Common7\\IDE;%PATH%\n'
            'set INCLUDE=%~dp0..\\..\\win_sdk\\Include\\um;'
               '%~dp0..\\..\\win_sdk\\Include\\shared;'
               '%~dp0..\\..\\win_sdk\\Include\\winrt;'
               '%~dp0..\\..\\ucrt\\Include\\10.0.10056.0\\ucrt;'
               '%~dp0..\\..\\VC\\include;'
               '%~dp0..\\..\\VC\\atlmfc\\include\n'
            'if "%1"=="/x64" goto x64\n')

    # x86. Always use amd64_x86 cross, not x86 on x86.
    f.write('set PATH=%~dp0..\\..\\win_sdk\\bin\\x86;'
              '%~dp0..\\..\\VC\\bin\\amd64_x86;'
              '%~dp0..\\..\\VC\\bin\\amd64;'  # Needed for mspdb1x0.dll.
              '%PATH%\n')
    f.write('set LIB=%~dp0..\\..\\VC\\lib;'
               '%~dp0..\\..\\win_sdk\\Lib\\winv6.3\\um\\x86;'
               '%~dp0..\\..\\ucrt\\Lib\\10.0.10056.0\\ucrt\\x86;'
               '%~dp0..\\..\\VC\\atlmfc\\lib\n'
            'goto :EOF\n')

    # x64.
    f.write(':x64\n'
            'set PATH=%~dp0..\\..\\win_sdk\\bin\\x64;'
                '%~dp0..\\..\\VC\\bin\\amd64;'
                '%PATH%\n')
    f.write('set LIB=%~dp0..\\..\\VC\\lib\\amd64;'
               '%~dp0..\\..\\win_sdk\\Lib\\winv6.3\\um\\x64;'
               '%~dp0..\\..\\ucrt\\Lib\\10.0.10056.0\\ucrt\\x64;'
               '%~dp0..\\..\\VC\\atlmfc\\lib\\amd64\n')


def AddEnvSetup(files):
  """We need to generate this file in the same way that the "from pieces"
  script does, so pull that in here."""
  tempdir = tempfile.mkdtemp()
  os.makedirs(os.path.join(tempdir, 'win_sdk', 'bin'))
  GenerateSetEnvCmd(tempdir)
  files.append((os.path.join(tempdir, 'win_sdk', 'bin', 'SetEnv.cmd'),
                'win_sdk\\bin\\SetEnv.cmd'))
  vs_version_file = os.path.join(tempdir, 'VS_VERSION')
  with open(vs_version_file, 'wb') as version:
    print >>version, VS_VERSION
  files.append((vs_version_file, 'VS_VERSION'))


def RenameToSha1(output):
  """Determine the hash in the same way that the unzipper does to rename the
  # .zip file."""
  print 'Extracting to determine hash...'
  tempdir = tempfile.mkdtemp()
  old_dir = os.getcwd()
  os.chdir(tempdir)
  rel_dir = 'vs_files'
  with zipfile.ZipFile(
      os.path.join(old_dir, output), 'r', zipfile.ZIP_DEFLATED, True) as zf:
    zf.extractall(rel_dir)
  print 'Hashing...'
  sha1 = get_toolchain_if_necessary.CalculateHash(rel_dir)
  os.chdir(old_dir)
  shutil.rmtree(tempdir)
  final_name = sha1 + '.zip'
  os.rename(output, final_name)
  print 'Renamed %s to %s.' % (output, final_name)


def main():
  if len(sys.argv) != 2 or sys.argv[1] not in ('2013', '2015'):
    print 'Usage: package_from_installed.py 2013|2015'
    return 1

  global VS_VERSION
  VS_VERSION = sys.argv[1]

  print 'Building file list...'
  files = BuildFileList()

  AddEnvSetup(files)

  if False:
    for f in files:
      print f[0], '->', f[1]
    return 0

  output = 'out.zip'
  if os.path.exists(output):
    os.unlink(output)
  count = 0
  with zipfile.ZipFile(output, 'w', zipfile.ZIP_DEFLATED, True) as zf:
    for disk_name, archive_name in files:
      sys.stdout.write('\r%d/%d ...%s' % (count, len(files), disk_name[-40:]))
      sys.stdout.flush()
      count += 1
      zf.write(disk_name, archive_name)
  sys.stdout.write('\rWrote to %s.%s\n' % (output, ' '*50))
  sys.stdout.flush()

  RenameToSha1(output)

  return 0


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