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#!/usr/bin/env python
import optparse
import os
import pprint
import re
import subprocess
import sys

CC = os.environ.get('CC', 'cc')

root_dir = os.path.dirname(__file__)
sys.path.insert(0, os.path.join(root_dir, 'deps', 'v8', 'tools'))

# parse our options
parser = optparse.OptionParser()

parser.add_option("--debug",
    action="store_true",
    dest="debug",
    help="Also build debug build")

parser.add_option("--prefix",
    action="store",
    dest="prefix",
    help="Select the install prefix (defaults to /usr/local)")

parser.add_option("--without-npm",
    action="store_true",
    dest="without_npm",
    help="Don\'t install the bundled npm package manager")

parser.add_option("--without-ssl",
    action="store_true",
    dest="without_ssl",
    help="Build without SSL")

parser.add_option("--without-snapshot",
    action="store_true",
    dest="without_snapshot",
    help="Build without snapshotting V8 libraries. You might want to set"
         " this for cross-compiling. [Default: False]")

parser.add_option("--shared-v8",
    action="store_true",
    dest="shared_v8",
    help="Link to a shared V8 DLL instead of static linking")

parser.add_option("--shared-v8-includes",
    action="store",
    dest="shared_v8_includes",
    help="Directory containing V8 header files")

parser.add_option("--shared-v8-libpath",
    action="store",
    dest="shared_v8_libpath",
    help="A directory to search for the shared V8 DLL")

parser.add_option("--shared-v8-libname",
    action="store",
    dest="shared_v8_libname",
    help="Alternative lib name to link to (default: 'v8')")

parser.add_option("--shared-openssl",
    action="store_true",
    dest="shared_openssl",
    help="Link to a shared OpenSSl DLL instead of static linking")

parser.add_option("--shared-openssl-includes",
    action="store",
    dest="shared_openssl_includes",
    help="Directory containing OpenSSL header files")

parser.add_option("--shared-openssl-libpath",
    action="store",
    dest="shared_openssl_libpath",
    help="A directory to search for the shared OpenSSL DLLs")

parser.add_option("--shared-openssl-libname",
    action="store",
    dest="shared_openssl_libname",
    help="Alternative lib name to link to (default: 'crypto,ssl')")

# deprecated
parser.add_option("--openssl-use-sys",
    action="store_true",
    dest="shared_openssl",
    help=optparse.SUPPRESS_HELP)

# deprecated
parser.add_option("--openssl-includes",
    action="store",
    dest="shared_openssl_includes",
    help=optparse.SUPPRESS_HELP)

# deprecated
parser.add_option("--openssl-libpath",
    action="store",
    dest="shared_openssl_libpath",
    help=optparse.SUPPRESS_HELP)

parser.add_option("--no-ssl2",
    action="store_true",
    dest="no_ssl2",
    help="Disable OpenSSL v2")

parser.add_option("--shared-zlib",
    action="store_true",
    dest="shared_zlib",
    help="Link to a shared zlib DLL instead of static linking")

parser.add_option("--shared-zlib-includes",
    action="store",
    dest="shared_zlib_includes",
    help="Directory containing zlib header files")

parser.add_option("--shared-zlib-libpath",
    action="store",
    dest="shared_zlib_libpath",
    help="A directory to search for the shared zlib DLL")

parser.add_option("--shared-zlib-libname",
    action="store",
    dest="shared_zlib_libname",
    help="Alternative lib name to link to (default: 'z')")

parser.add_option("--with-dtrace",
    action="store_true",
    dest="with_dtrace",
    help="Build with DTrace (default is true on supported systems)")

parser.add_option("--without-dtrace",
    action="store_true",
    dest="without_dtrace",
    help="Build without DTrace")

parser.add_option("--with-etw",
    action="store_true",
    dest="with_etw",
    help="Build with ETW (default is true on Windows)")

parser.add_option("--without-etw",
    action="store_true",
    dest="without_etw",
    help="Build without ETW")

# CHECKME does this still work with recent releases of V8?
parser.add_option("--gdb",
    action="store_true",
    dest="gdb",
    help="add gdb support")

parser.add_option("--dest-cpu",
    action="store",
    dest="dest_cpu",
    help="CPU architecture to build for. Valid values are: arm, ia32, x64")

parser.add_option("--no-ifaddrs",
    action="store_true",
    dest="no_ifaddrs",
    help="Use on deprecated SunOS systems that do not support ifaddrs.h")

parser.add_option("--with-arm-float-abi",
    action="store",
    dest="arm_float_abi",
    help="Specifies which floating-point ABI to use. Valid values are: "
         "soft, softfp, hard")

(options, args) = parser.parse_args()


def b(value):
  """Returns the string 'true' if value is truthy, 'false' otherwise."""
  if value:
    return 'true'
  else:
    return 'false'


def pkg_config(pkg):
  cmd = os.popen('pkg-config --libs %s' % pkg, 'r')
  libs = cmd.readline().strip()
  ret = cmd.close()
  if (ret): return None

  cmd = os.popen('pkg-config --cflags %s' % pkg, 'r')
  cflags = cmd.readline().strip()
  ret = cmd.close()
  if (ret): return None

  return (libs, cflags)


def cc_macros():
  """Checks predefined macros using the CC command."""

  try:
    p = subprocess.Popen(CC.split() + ['-dM', '-E', '-'],
                         stdin=subprocess.PIPE,
                         stdout=subprocess.PIPE,
                         stderr=subprocess.PIPE)
  except OSError:
    print '''Node.js configure error: No acceptable C compiler found!

Please make sure you have a C compiler installed on your system and/or
consider adjusting the CC environment variable if you installed
it in a non-standard prefix.
'''
    sys.exit()

  p.stdin.write('\n')
  out = p.communicate()[0]

  out = str(out).split('\n')

  k = {}
  for line in out:
    import shlex
    lst = shlex.split(line)
    if len(lst) > 2:
      key = lst[1]
      val = lst[2]
      k[key] = val
  return k


def is_arch_armv7():
  """Check for ARMv7 instructions"""
  cc_macros_cache = cc_macros()
  return ('__ARM_ARCH_7__' in cc_macros_cache or
          '__ARM_ARCH_7A__' in cc_macros_cache or
          '__ARM_ARCH_7R__' in cc_macros_cache or
          '__ARM_ARCH_7M__' in cc_macros_cache)


def arm_hard_float_abi():
  """Check for hardfloat or softfloat eabi on ARM"""
  # GCC versions 4.6 and above define __ARM_PCS or __ARM_PCS_VFP to specify
  # the Floating Point ABI used (PCS stands for Procedure Call Standard).
  # We use these as well as a couple of other defines to statically determine
  # what FP ABI used.
  # GCC versions 4.4 and below don't support hard-fp.
  # GCC versions 4.5 may support hard-fp without defining __ARM_PCS or
  # __ARM_PCS_VFP.

  if compiler_version() >= (4, 6, 0):
    return '__ARM_PCS_VFP' in cc_macros()
  elif compiler_version() < (4, 5, 0):
    return False
  elif '__ARM_PCS_VFP' in cc_macros():
    return True
  elif ('__ARM_PCS' in cc_macros() or
        '__SOFTFP' in cc_macros() or
        not '__VFP_FP__' in cc_macros()):
    return False
  else:
    print '''Node.js configure error: Your version of GCC does not report
the Floating-Point ABI to compile for your hardware

Please manually specify which floating-point ABI to use with the
--with-arm-float-abi option.
'''
    sys.exit()


def host_arch_cc():
  """Host architecture check using the CC command."""

  k = cc_macros()

  matchup = {
    '__x86_64__' : 'x64',
    '__i386__' : 'ia32',
    '__arm__' : 'arm',
  }

  rtn = 'ia32' # default

  for i in matchup:
    if i in k and k[i] != '0':
      rtn = matchup[i]
      break

  return rtn


def host_arch_win():
  """Host architecture check using environ vars (better way to do this?)"""

  arch = os.environ.get('PROCESSOR_ARCHITECTURE', 'x86')

  matchup = {
    'AMD64' : 'x64',
    'x86' : 'ia32',
    'arm' : 'arm',
  }

  return matchup.get(arch, 'ia32')


def compiler_version():
  try:
    proc = subprocess.Popen(CC.split() + ['--version'], stdout=subprocess.PIPE)
  except WindowsError:
    return (0, False)

  is_clang = 'clang' in proc.communicate()[0].split('\n')[0]

  proc = subprocess.Popen(CC.split() + ['-dumpversion'], stdout=subprocess.PIPE)
  version = tuple(map(int, proc.communicate()[0].split('.')))

  return (version, is_clang)


def configure_node(o):
  # TODO add gdb
  o['variables']['v8_no_strict_aliasing'] = 1 # work around compiler bugs
  o['variables']['node_prefix'] = os.path.expanduser(options.prefix or '')
  o['variables']['node_install_npm'] = b(not options.without_npm)
  o['default_configuration'] = 'Debug' if options.debug else 'Release'

  host_arch = host_arch_win() if os.name == 'nt' else host_arch_cc()
  target_arch = options.dest_cpu or host_arch
  o['variables']['host_arch'] = host_arch
  o['variables']['target_arch'] = target_arch

  # V8 on ARM requires that armv7 is set. CPU Model detected by
  # the presence of __ARM_ARCH_7__ and the like defines in compiler
  if target_arch == 'arm':
    if options.arm_float_abi:
      hard_float = options.arm_float_abi == 'hard'
    else:
      hard_float = arm_hard_float_abi()
    o['variables']['v8_use_arm_eabi_hardfloat'] = b(hard_float)
    o['variables']['armv7'] = 1 if is_arch_armv7() else 0

  cc_version, is_clang = compiler_version()
  o['variables']['clang'] = 1 if is_clang else 0

  if not is_clang and cc_version != 0:
    o['variables']['gcc_version'] = 10 * cc_version[0] + cc_version[1]

  # clang has always supported -fvisibility=hidden, right?
  if not is_clang and cc_version < (4,0,0):
    o['variables']['visibility'] = ''

  # By default, enable DTrace on SunOS systems. Don't allow it on other
  # systems, since it won't work. (The MacOS build process is different than
  # SunOS, and we haven't implemented it.)
  if sys.platform.startswith('sunos'):
    o['variables']['node_use_dtrace'] = b(not options.without_dtrace)
  elif b(options.with_dtrace) == 'true':
    raise Exception('DTrace is currently only supported on SunOS systems.')
  else:
    o['variables']['node_use_dtrace'] = 'false'

  if options.no_ifaddrs:
    o['defines'] += ['SUNOS_NO_IFADDRS']

  # By default, enable ETW on Windows.
  if sys.platform.startswith('win32'):
    o['variables']['node_use_etw'] = b(not options.without_etw);
  elif b(options.with_etw) == 'true':
    raise Exception('ETW is only supported on Windows.')
  else:
    o['variables']['node_use_etw'] = 'false'


def configure_libz(o):
  o['variables']['node_shared_zlib'] = b(options.shared_zlib)

  # assume shared_zlib if one of these is set?
  if options.shared_zlib_libpath:
    o['libraries'] += ['-L%s' % options.shared_zlib_libpath]
  if options.shared_zlib_libname:
    o['libraries'] += ['-l%s' % options.shared_zlib_libname]
  elif options.shared_zlib:
    o['libraries'] += ['-lz']
  if options.shared_zlib_includes:
    o['include_dirs'] += [options.shared_zlib_includes]


def configure_v8(o):
  o['variables']['v8_use_snapshot'] = b(not options.without_snapshot)
  o['variables']['node_shared_v8'] = b(options.shared_v8)

  # assume shared_v8 if one of these is set?
  if options.shared_v8_libpath:
    o['libraries'] += ['-L%s' % options.shared_v8_libpath]
  if options.shared_v8_libname:
    o['libraries'] += ['-l%s' % options.shared_v8_libname]
  elif options.shared_v8:
    o['libraries'] += ['-lv8']
  if options.shared_v8_includes:
    o['include_dirs'] += [options.shared_v8_includes]


def configure_openssl(o):
  o['variables']['node_use_openssl'] = b(not options.without_ssl)
  o['variables']['node_shared_openssl'] = b(options.shared_openssl)

  if options.without_ssl:
    return

  if options.no_ssl2:
    o['defines'] += ['OPENSSL_NO_SSL2=1']

  if options.shared_openssl:
    (libs, cflags) = pkg_config('openssl') or ('-lssl -lcrypto', '')

    if options.shared_openssl_libpath:
      o['libraries'] += ['-L%s' % options.shared_openssl_libpath]

    if options.shared_openssl_libname:
      libnames = options.shared_openssl_libname.split(',')
      o['libraries'] += ['-l%s' % s for s in libnames]
    else:
      o['libraries'] += libs.split()

    if options.shared_openssl_includes:
      o['include_dirs'] += [options.shared_openssl_includes]
    else:
      o['cflags'] += cflags.split()


output = {
  'variables': {},
  'include_dirs': [],
  'libraries': [],
  'defines': [],
  'cflags': [],
}

configure_node(output)
configure_libz(output)
configure_v8(output)
configure_openssl(output)

# variables should be a root level element,
# move everything else to target_defaults
variables = output['variables']
del output['variables']
output = {
  'variables': variables,
  'target_defaults': output
}
pprint.pprint(output, indent=2)

def write(filename, data):
  filename = os.path.join(root_dir, filename)
  print "creating ", filename
  f = open(filename, 'w+')
  f.write(data)

write('config.gypi', "# Do not edit. Generated by the configure script.\n" +
  pprint.pformat(output, indent=2) + "\n")

write('config.mk', "# Do not edit. Generated by the configure script.\n" +
  ("BUILDTYPE=%s\n" % ('Debug' if options.debug else 'Release')))

if os.name == 'nt':
  gyp_args = ['-f', 'msvs', '-G', 'msvs_version=2010']
else:
  gyp_args = ['-f', 'make']

subprocess.call([sys.executable, 'tools/gyp_node'] + gyp_args)
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