#!/usr/bin/env python

import glob
import os
import subprocess
import sys

print 'using python: ' + sys.executable + ' version: ' + sys.version

qtwebengine_root = os.path.abspath(os.path.join(os.path.dirname(__file__), '../..'))
qtwebengine_src = os.path.join(qtwebengine_root, 'src')
chrome_src = subprocess.check_output("git config qtwebengine.chromiumsrcdir || true", shell=True).strip()
if chrome_src:
  chrome_src = os.path.join(qtwebengine_root, chrome_src)
if not chrome_src or not os.path.isdir(chrome_src):
  chrome_src = os.path.join(qtwebengine_root, 'src/3rdparty/chromium')
  print 'CHROMIUM_SRC_DIR not set, falling back to ' + chrome_src

script_dir = os.path.abspath(os.path.join(chrome_src, 'build'))
if not os.path.isdir(script_dir):
  print script_dir + " is not a valid directory"
  sys.exit(1)
root_dir = os.path.abspath(os.path.join(os.getcwd(), os.pardir, os.pardir))

sys.path.insert(0, script_dir)
import gyp_helper
sys.path.insert(0, os.path.join(chrome_src, 'tools', 'gyp', 'pylib'))
import gyp

# Add paths so that pymod_do_main(...) can import files.
sys.path.insert(1, os.path.join(chrome_src, 'tools', 'grit'))
sys.path.insert(1, os.path.join(chrome_src, 'tools', 'generate_shim_headers'))

sys.path.insert(1, os.path.join(chrome_src, 'third_party', 'WebKit',
    'Source', 'core', 'core.gyp', 'scripts'))
# Remove the above and keep the line below once we require a newer specific
# Chromium revision.
sys.path.insert(1, os.path.join(chrome_src, 'third_party', 'WebKit',
    'Source', 'core', 'scripts'))

sys.path.insert(1, os.path.join(chrome_src, 'chrome', 'tools', 'build'))

import repack_locales

def additional_include_files(args=[]):
  """
  Returns a list of additional (.gypi) files to include, without
  duplicating ones that are already specified on the command line.
  """
  # Determine the include files specified on the command line.
  # This doesn't cover all the different option formats you can use,
  # but it's mainly intended to avoid duplicating flags on the automatic
  # makefile regeneration which only uses this format.
  specified_includes = set()
  for arg in args:
    if arg.startswith('-I') and len(arg) > 2:
      specified_includes.add(os.path.realpath(arg[2:]))

  result = []
  def AddInclude(path):
    if os.path.realpath(path) not in specified_includes:
      result.append(path)

  # Always include common.gypi.
  AddInclude(os.path.join(script_dir, 'common.gypi'))

  # Used for additional build tweaks such as file exclusions
  AddInclude(os.path.join(qtwebengine_root, 'src', 'core', 'qtwebengine_extras.gypi'))

  # Common stuff we generate and extract from qmake
  AddInclude(os.path.join(qtwebengine_root, 'src', 'core', 'qmake_extras.gypi'))

  # Optionally add supplemental .gypi files if present.
  supplements = glob.glob(os.path.join(chrome_src, '*', 'supplement.gypi'))
  for supplement in supplements:
    AddInclude(supplement)

  return result

# TODO: later we probably want to hook that up with qmake to allow shadow builds. (Might not play nice with the rest of chromium though)
def get_output_dir():
  outdir = os.path.join(root_dir, "out") # Hardcode for now
  if not os.path.isdir(outdir):
    os.mkdir(outdir)

  return outdir

if __name__ == '__main__':
  args = sys.argv[1:]

  # On Mac we want to override CXX and CC that is provided with
  # the Chromium GYP environment.
  if sys.platform.startswith('darwin') and not 'GYP_CROSSCOMPILE' in os.environ:
    os.environ['CXX'] = 'clang++'
    os.environ['CC'] = 'clang'

  gyp_helper.apply_chromium_gyp_env()

  # This could give false positives since it doesn't actually do real option
  # parsing.  Oh well.
  gyp_file_specified = False
  for arg in args:
    if arg.endswith('.gyp'):
      gyp_file_specified = True
      break

  if not gyp_file_specified:
      args.append(os.path.join(root_dir, 'src/core/core.gyp'))

  args.extend(['-I' + i for i in additional_include_files(args)])

  # On Mac we want to build in x64 mode. And we want to use libc++.
  # Even though we are not on linux, it seems we specifically have to disable linux_use_tcmalloc.
  if sys.platform in ('darwin',) and not 'GYP_CROSSCOMPILE' in os.environ:
      args.extend(['-D', 'host_arch=x64', '-D', 'use_libcpp=1', '-D', 'linux_use_tcmalloc=0'])

  # There shouldn't be a circular dependency relationship between .gyp files,
  # but in Chromium's .gyp files, on non-Mac platforms, circular relationships
  # currently exist.  The check for circular dependencies is currently
  # bypassed on other platforms, but is left enabled on the Mac, where a
  # violation of the rule causes Xcode to misbehave badly.
  # TODO(mark): Find and kill remaining circular dependencies, and remove this
  # option.  http://crbug.com/35878.
  # TODO(tc): Fix circular dependencies in ChromiumOS then add linux2 to the
  # list.
  if sys.platform not in ('darwin',):
    args.append('--no-circular-check')

  args.extend(['-D', 'webkit_src_dir=' + chrome_src + '/third_party/WebKit'])
  # the top_level source directory is the first common ancestor of our module and the chromium source tree for the build to be sane.
  # commonprefix works on a character basis, so it might return a phony common prefix (not the common parent directory we expect),
  toplevel= os.path.commonprefix([root_dir, chrome_src])
  if not os.path.exists(toplevel):
    toplevel = os.path.join(toplevel, os.pardir)
  args.extend(["--toplevel-dir=" + toplevel])
  # Chromium specific Hack: for Chromium to build, the depth has to be set to the chromium src dir.
  args.extend(["--depth=" + chrome_src])
  args.extend(['-D', 'qtwebengine_src_dir=' + qtwebengine_src])
  args.extend(['-D', 'chromium_src_dir=' + chrome_src])

  if 'qt_cross_compile=1' in sys.argv:
    os.environ['GYP_CROSSCOMPILE'] = '1'

  # linux_use_gold_binary currently relies on a hardcoded relative path from chromium/src/out/(Release|Debug)
  # Disable it along with the -Wl,--threads flag just in case gold isn't installed on the system.
  args.extend(['-D', 'linux_use_gold_binary=0'])
  args.extend(['-D', 'linux_use_gold_flags=0'])
  # Trigger Qt-specific build conditions.
  args.extend(['-D', 'use_qt=1'])
  # Tweak the output location and format (hardcode ninja for now if not set)
  args.extend(['--generator-output', os.path.abspath(get_output_dir())])
  args.extend(['-Goutput_dir='+ os.path.abspath(get_output_dir())])
  if not os.environ.get('GYP_GENERATORS'):
    args.extend(['--format=ninja'])
  if "QTWEBENGINE_GYP_DEBUG" in os.environ:
    args.append("--check")
    args.append("-d all")
    print args
    ret_code = gyp.main(args)
    sys.exit(ret_code)

  ###################################

  print 'Updating projects from gyp files...'
  #sys.stdout.flush()

  # Off we go...
  sys.exit(gyp.main(args))