#!/usr/bin/env python
"""
gn can only run python scripts. This launches a subprocess Node process.
The working dir of this program is out/Debug/ (AKA root_build_dir)
Before running node, we symlink js/node_modules to out/Debug/node_modules.
"""
import subprocess
import sys
import os


def symlink(target, name, target_is_dir=False):
    if os.name == "nt":
        import ctypes
        CreateSymbolicLinkW = ctypes.windll.kernel32.CreateSymbolicLinkW
        CreateSymbolicLinkW.restype = ctypes.c_ubyte
        CreateSymbolicLinkW.argtypes = (ctypes.c_wchar_p, ctypes.c_wchar_p,
                                        ctypes.c_uint32)

        flags = 0x02  # SYMBOLIC_LINK_FLAG_ALLOW_UNPRIVILEGED_CREATE
        if (target_is_dir):
            flags |= 0x01  # SYMBOLIC_LINK_FLAG_DIRECTORY
        if not CreateSymbolicLinkW(name, target, flags):
            raise ctypes.WinError()
    else:
        os.symlink(target, name)


js_path = os.path.dirname(os.path.realpath(__file__))
target_abs = os.path.join(js_path, "node_modules")
target_rel = os.path.relpath(target_abs)

if not os.path.exists("node_modules"):
    if os.path.lexists("node_modules"):
        os.unlink("node_modules")
    symlink(target_rel, "node_modules", True)

args = ["node"] + sys.argv[1:]
sys.exit(subprocess.call(args))