# -*- Mode: python; indent-tabs-mode: nil; tab-width: 40 -*-
# vim: set filetype=python:
# This Source Code Form is subject to the terms of the Mozilla Public
# License, v. 2.0. If a copy of the MPL was not distributed with this
# file, You can obtain one at http://mozilla.org/MPL/2.0/.

option('--enable-nodejs',
       help='Require Node.js to build')


# "nodejs" is first in the tuple on the assumption that it's only likely to
# exist on systems (probably linux distros) where there is a program in the path
# called "node" that does something else.
nodejs = check_prog('NODEJS', ('nodejs', 'node',),
                    allow_missing=True)


@depends_if(nodejs)
@checking('for node.js version')
@imports('os')
@imports('re')
@imports('subprocess')
def nodejs_version(node):
    env = dict(os.environ)
    env[b'NODE_DISABLE_COLORS'] = b'1'

    out = check_cmd_output(node, '--version', env=env)

    match = re.search(r'v(.+)$', out)

    if not match:
        return None

    return Version(match.group(1))


@depends('--enable-nodejs', nodejs, nodejs_version)
def nodejs_suitability(require, node, version):
    MIN_NODE_VERSION = Version('8.11')

    if not node:
        msg = ('could not find Node.js executable; ensure `node` or `nodejs` '
               'is in PATH or set NODEJS in environment to point to an '
               'executable')

        if require:
            raise FatalCheckError(msg)
        else:
            log.warning(msg)
            log.warning('(This will become an error in the near future.)')
            return

    if not version:
        msg = 'could not resolve Node.js version'
        if require:
            raise FatalCheckError(msg)
        else:
            log.warning(msg)
            log.warning('(This will become an error in the near future.)')
            return

    if version < MIN_NODE_VERSION:
        msg = 'NODEJS must point to node %s or newer; %s found' % (
            MIN_NODE_VERSION, version)

        if require:
            raise FatalCheckError(msg)
        else:
            log.warning(msg)