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from __future__ import annotations

import contextlib

import functools

import os

import sys

from typing import Generator

from typing import Sequence

import pre_commit.constants as C

from pre_commit import lang_base

from pre_commit.envcontext import envcontext

from pre_commit.envcontext import PatchesT

from pre_commit.envcontext import UNSET

from pre_commit.envcontext import Var

from pre_commit.languages.python import bin_dir

from pre_commit.prefix import Prefix

from pre_commit.util import cmd_output

from pre_commit.util import cmd_output_b

from pre_commit.util import rmtree

ENVIRONMENT_DIR = 'node_env'

run_hook = lang_base.basic_run_hook

@functools.lru_cache(maxsize=1)

def get_default_version() -> str:

# nodeenv does not yet support `-n system` on windows

if sys.platform == 'win32':

return C.DEFAULT

# if node is already installed, we can save a bunch of setup time by

# using the installed version

elif all(lang_base.exe_exists(exe) for exe in ('node', 'npm')):

return 'system'

else:

return C.DEFAULT

def get_env_patch(venv: str) -> PatchesT:

if sys.platform == 'cygwin': # pragma: no cover

_, win_venv, _ = cmd_output('cygpath', '-w', venv)

install_prefix = fr'{win_venv.strip()}\bin'

lib_dir = 'lib'

elif sys.platform == 'win32': # pragma: no cover

install_prefix = bin_dir(venv)

lib_dir = 'Scripts'

else: # pragma: win32 no cover

install_prefix = venv

lib_dir = 'lib'

return (

('NODE_VIRTUAL_ENV', venv),

('NPM_CONFIG_PREFIX', install_prefix),

('npm_config_prefix', install_prefix),

('NPM_CONFIG_USERCONFIG', UNSET),

('npm_config_userconfig', UNSET),

('NODE_PATH', os.path.join(venv, lib_dir, 'node_modules')),

('PATH', (bin_dir(venv), os.pathsep, Var('PATH'))),

)

@contextlib.contextmanager

def in_env(prefix: Prefix, version: str) -> Generator[None, None, None]:

envdir = lang_base.environment_dir(prefix, ENVIRONMENT_DIR, version)

with envcontext(get_env_patch(envdir)):

yield

def health_check(prefix: Prefix, version: str) -> str | None:

with in_env(prefix, version):

retcode, _, _ = cmd_output_b('node', '--version', check=False)

if retcode != 0: # pragma: win32 no cover

return f'`node --version` returned {retcode}'

else:

return None

def install_environment(

prefix: Prefix, version: str, additional_dependencies: Sequence[str],

) -> None:

assert prefix.exists('package.json')

envdir = lang_base.environment_dir(prefix, ENVIRONMENT_DIR, version)

# https://msdn.microsoft.com/en-us/library/windows/desktop/aa365247(v=vs.85).aspx?f=255&MSPPError=-2147217396#maxpath

if sys.platform == 'win32': # pragma: no cover

envdir = fr'\\?\{os.path.normpath(envdir)}'

cmd = [sys.executable, '-mnodeenv', '--prebuilt', '--clean-src', envdir]

if version != C.DEFAULT:

cmd.extend(['-n', version])

cmd_output_b(*cmd)

with in_env(prefix, version):

# https://npm.community/t/npm-install-g-git-vs-git-clone-cd-npm-install-g/5449

# install as if we installed from git

local_install_cmd = (

'npm', 'install', '--dev', '--prod',

'--ignore-prepublish', '--no-progress', '--no-save',

)

lang_base.setup_cmd(prefix, local_install_cmd)

_, pkg, _ = cmd_output('npm', 'pack', cwd=prefix.prefix_dir)

pkg = prefix.path(pkg.strip())

install = ('npm', 'install', '-g', pkg, *additional_dependencies)

lang_base.setup_cmd(prefix, install)

# clean these up after installation

if prefix.exists('node_modules'): # pragma: win32 no cover

rmtree(prefix.path('node_modules'))

os.remove(pkg)

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