#!/usr/bin/env python

import optparse
import os
import pprint
import subprocess
import sys

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-isolates",
    action="store_true",
    dest="without_isolates",
    help="Build without isolates (no threads, single loop) [Default: False]")

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("--openssl-use-sys",
    action="store",
    dest="openssl_use_sys",
    help="Use the system OpenSSL instead of one included with Node")

parser.add_option("--openssl-includes",
    action="store",
    dest="openssl_includes",
    help="A directory to search for the OpenSSL includes")

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

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

parser.add_option("--shared-cares",
    action="store_true",
    dest="shared_cares",
    help="Link to a shared C-Ares DLL instead of static linking")

parser.add_option("--shared-cares-includes",
    action="store",
    dest="shared_cares_includes",
    help="Directory containing C-Ares header files")

parser.add_option("--shared-cares-libpath",
    action="store",
    dest="shared_cares_libpath",
    help="A directory to search for the shared C-Ares DLL")

parser.add_option("--with-dtrace",
    action="store_true",
    dest="with_dtrace",
    help="Build with DTrace (experimental)")

# 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")

(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 uname(switch):
  f = os.popen('uname %s' % switch)
  s = f.read().strip()
  f.close()
  return s


def host_arch():
  """Host architecture. One of arm, ia32 or x64."""
  arch = uname('-p')

  if arch == 'unknown':
    arch = uname('-m')

  return {
    'arm': 'arm',
    'x86': 'ia32',
    'i386': 'ia32',
    'x86_64': 'x64',
  }.get(arch, 'ia32')


def target_arch():
  return host_arch()


def configure_node(o):
  # TODO add gdb
  o['variables']['node_use_isolates'] = b(not options.without_isolates)
  o['variables']['node_debug'] = b(options.debug)
  o['variables']['node_prefix'] = options.prefix if options.prefix else ''
  o['variables']['node_use_dtrace'] = b(options.with_dtrace)
  o['variables']['node_install_npm'] = b(not options.without_npm)
  o['variables']['host_arch'] = host_arch()
  o['variables']['target_arch'] = options.dest_cpu or target_arch()

  # TODO move to node.gyp
  if sys.platform == 'sunos5':
    o['variables']['visibility'] = '' # FIXME -fvisibility=hidden, should be a gcc check


def configure_libz(o):
  o['libraries'] += ['-lz']


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]
  if options.shared_v8_includes:
    o['include_dirs'] += [options.shared_v8_includes]


def configure_cares(o):
  o['variables']['node_shared_cares'] = b(options.shared_cares)

  # assume shared_cares if one of these is set?
  if options.shared_cares_libpath:
    o['libraries'] += ['-L%s' % options.shared_cares_libpath]
  if options.shared_cares_includes:
    o['include_dirs'] += [options.shared_cares_includes]


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

  if options.without_ssl:
    return

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

  if not options.openssl_use_sys:
    o['variables']['node_use_system_openssl'] = b(False)
  else:
    out = pkg_config('openssl')
    (libs, cflags) = out if out else ('', '')

    if options.openssl_libpath:
      o['libraries'] += ['-L%s' % options.openssl_libpath, '-lssl', '-lcrypto']
    else:
      o['libraries'] += libs.split()

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

    o['variables']['node_use_system_openssl'] = b(
      libs or cflags or options.openssl_libpath or options.openssl_includes)


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

configure_node(output)
configure_libz(output)
configure_v8(output)
configure_cares(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)

fn = os.path.join(root_dir, 'config.gypi')
print "creating ", fn

f = open(fn, 'w+')
f.write("# Do not edit. Generated by the configure script.\n")
pprint.pprint(output, stream=f, indent=2)
f.write("\n")
f.close()

subprocess.call(['tools/gyp_node','-f', 'make'])