# /usr/bin/env python
import Options
import sys, os, shutil
from os.path import join, dirname, abspath
from logging import fatal

import js2c

srcdir = '.'
blddir = 'build'
cwd = os.getcwd()

def set_options(opt):
  # the gcc module provides a --debug-level option
  opt.tool_options('compiler_cxx')
  opt.tool_options('compiler_cc')
  opt.add_option( '--debug'
                , action='store_true'
                , default=False
                , help='Build debug variant [Default: False]'
                , dest='debug'
                )
  opt.add_option( '--efence'
                , action='store_true'
                , default=False
                , help='Build with -lefence for debugging [Default: False]'
                , dest='efence'
                )

def mkdir_p(dir):
  if not os.path.exists (dir):
    os.makedirs (dir)

def conf_subproject (conf, subdir, command=None):
  print("---- %s ----" % subdir)
  src = join(conf.srcdir, subdir)
  if not os.path.exists (src): fatal("no such subproject " + subdir)

  default_tgt = join(conf.blddir, "default", subdir)

  if not os.path.exists(default_tgt):
    shutil.copytree(src, default_tgt)

  if command:
    if os.system("cd %s && %s" % (default_tgt, command)) != 0:
      fatal("Configuring %s failed." % (subdir))

  debug_tgt = join(conf.blddir, "debug", subdir)

  if not os.path.exists(debug_tgt):
    shutil.copytree(default_tgt, debug_tgt)

def configure(conf):
  conf.check_tool('compiler_cxx')
  conf.check_tool('compiler_cc')

  conf.env["USE_DEBUG"] = Options.options.debug

  if Options.options.debug:
    conf.check(lib='profiler', uselib_store='PROFILER')

  if Options.options.efence:
    conf.check(lib='efence', libpath=['/usr/lib', '/usr/local/lib'], uselib_store='EFENCE')

  if sys.platform.startswith("freebsd"):
    if not conf.check(lib="execinfo", libpath=['/usr/lib', '/usr/local/lib'], uselib_store="EXECINFO"):
      fatal("Install the libexecinfo port from /usr/ports/devel/libexecinfo.")

  conf.sub_config('deps/libeio')
  conf.sub_config('deps/libev')

  conf_subproject(conf, 'deps/udns', './configure')
  conf_subproject(conf, 'deps/v8')

  # Not using TLS yet
  # if conf.check_cfg(package='gnutls', args='--cflags --libs', uselib_store="GNUTLS"):
  #   conf.define("HAVE_GNUTLS", 1)

  conf.define("HAVE_CONFIG_H", 1)

  conf.env.append_value("CCFLAGS", "-DEIO_STACKSIZE=%d" % (4096*8))

  # Split off debug variant before adding variant specific defines
  debug_env = conf.env.copy()
  conf.set_env_name('debug', debug_env)

  # Configure debug variant
  conf.setenv('debug')
  debug_env.set_variant('debug')
  debug_env.append_value('CCFLAGS', ['-DDEBUG', '-g', '-O0', '-Wall', '-Wextra', '-m32'])
  debug_env.append_value('CXXFLAGS', ['-DDEBUG', '-g', '-O0', '-Wall', '-Wextra', '-m32'])
  conf.write_config_header("config.h")

  # Configure default variant
  conf.setenv('default')
  conf.env.append_value('CCFLAGS', ['-DNDEBUG', '-O3', '-m32'])
  conf.env.append_value('CXXFLAGS', ['-DNDEBUG', '-O3', '-m32'])
  conf.write_config_header("config.h")

def build_udns(bld):
  default_build_dir = bld.srcnode.abspath(bld.env_of_name("default"))

  default_dir = join(default_build_dir, "deps/udns")

  static_lib = bld.env["staticlib_PATTERN"] % "udns"

  rule = 'cd %s && make'

  default = bld.new_task_gen(
    target= join("deps/udns", static_lib),
    rule= rule % default_dir,
    before= "cxx",
    install_path= None
  )

  bld.env["CPPPATH_UDNS"] = "deps/udns"
  bld.env["STATICLIB_UDNS"] = "udns"

  bld.env_of_name('default')["STATICLIB_UDNS"] = "udns"
  bld.env_of_name('default')["LIBPATH_UDNS"] = default_dir

  if bld.env["USE_DEBUG"]:
    debug_build_dir = bld.srcnode.abspath(bld.env_of_name("debug"))
    debug_dir = join(debug_build_dir, "deps/udns")
    debug = default.clone("debug")
    debug.rule = rule % debug_dir
    #debug.target = join(debug_dir, static_lib)
    bld.env_of_name('debug')["STATICLIB_UDNS"] = "udns"
    bld.env_of_name('debug')["LIBPATH_UDNS"] = debug_dir


def build_v8(bld):
  deps_src = join(bld.path.abspath(),"deps")
  deps_tgt = join(bld.srcnode.abspath(bld.env_of_name("default")),"deps")
  v8dir_src = join(deps_src,"v8")
  v8dir_tgt = join(deps_tgt, "v8")
  scons = os.path.join(cwd, 'tools/scons/scons.py')

  v8rule = 'cd %s && ' \
           'python %s -Q mode=%s library=static snapshot=on'

  v8 = bld.new_task_gen(
    target = join("deps/v8", bld.env["staticlib_PATTERN"] % "v8"),
    rule=v8rule % (v8dir_tgt, scons, "release"),
    before="cxx",
    install_path = None
  )
  bld.env["CPPPATH_V8"] = "deps/v8/include"
  bld.env_of_name('default')["STATICLIB_V8"] = "v8"
  bld.env_of_name('default')["LIBPATH_V8"] = v8dir_tgt
  bld.env_of_name('default')["LINKFLAGS_V8"] = ["-pthread", "-m32"]

  ### v8 debug
  if bld.env["USE_DEBUG"]:
    deps_tgt = join(bld.srcnode.abspath(bld.env_of_name("debug")),"deps")
    v8dir_tgt = join(deps_tgt, "v8")

    v8_debug = v8.clone("debug")
    bld.env_of_name('debug')["STATICLIB_V8"] = "v8_g"
    bld.env_of_name('debug')["LIBPATH_V8"] = v8dir_tgt
    bld.env_of_name('debug')["LINKFLAGS_V8"] = ["-pthread", "-m32"]
    v8_debug.rule = v8rule % (v8dir_tgt, scons, "debug")
    v8_debug.target = join("deps/v8", bld.env["staticlib_PATTERN"] % "v8_g")

def build(bld):
  bld.add_subdirs('deps/libeio deps/libev')

  build_udns(bld)
  build_v8(bld)

  ### evcom
  evcom = bld.new_task_gen("cc", "staticlib")
  evcom.source = "deps/evcom/evcom.c"
  evcom.includes = "deps/evcom/ deps/libev/"
  evcom.name = "evcom"
  evcom.target = "evcom"
  # evcom.uselib = "GNUTLS"
  evcom.install_path = None
  if bld.env["USE_DEBUG"]:
    evcom.clone("debug")

  ### http_parser
  http_parser = bld.new_task_gen("cc", "staticlib")
  http_parser.source = "deps/http_parser/http_parser.c"
  http_parser.includes = "deps/http_parser/"
  http_parser.name = "http_parser"
  http_parser.target = "http_parser"
  http_parser.install_path = None
  if bld.env["USE_DEBUG"]:
    http_parser.clone("debug")

  ### coupling
  coupling = bld.new_task_gen("cc", "staticlib")
  coupling.source = "deps/coupling/coupling.c"
  coupling.includes = "deps/coupling/"
  coupling.name = "coupling"
  coupling.target = "coupling"
  coupling.install_path = None
  if bld.env["USE_DEBUG"]:
    coupling.clone("debug")

  ### src/native.cc
  def javascript_in_c(task):
    env = task.env
    source = map(lambda x: x.srcpath(env), task.inputs)
    targets = map(lambda x: x.srcpath(env), task.outputs)
    js2c.JS2C(source, targets)

  native_cc = bld.new_task_gen(
    source = """
      src/util.js
      src/events.js
      src/http.js
      src/file.js
      src/node.js
    """,
    target="src/natives.h",
    rule=javascript_in_c,
    before="cxx"
  )
  native_cc.install_path = None
  if bld.env["USE_DEBUG"]:
    native_cc.clone("debug")

  ### node
  node = bld.new_task_gen("cxx", "program")
  node.target = 'node'
  node.source = """
    src/node.cc
    src/events.cc
    src/http.cc
    src/net.cc
    src/node_stdio.cc
    src/dns.cc
    src/file.cc
    src/timer.cc
    src/process.cc
    src/constants.cc
  """
  node.includes = """
    src/ 
    deps/v8/include
    deps/libev
    deps/udns
    deps/libeio
    deps/evcom 
    deps/http_parser
    deps/coupling
  """
  node.uselib_local = "evcom ev eio http_parser coupling"
  node.uselib = "UDNS V8 EXECINFO PROFILER EFENCE"
  node.install_path = '${PREFIX}/bin'
  node.chmod = 0755

  if bld.env["USE_DEBUG"]:
    node.clone("debug")