import pytest
import os
import subprocess
import sys
from collections import namedtuple


@pytest.fixture()
def ngcpcfgcli(tmpdir, *args):
    """Execute ``ngcpcfg``."""

    def run(*args, env={}):
        testenv = {
            'PATH':      'fixtures/bin:/usr/bin:/bin:/usr/sbin:/sbin',
            'FUNCTIONS': '../functions/',
            'NGCPCFG':   'fixtures/ngcpcfg.cfg',
            'SCRIPTS':   '../scripts/',
            'HELPER':    '../helper/',
            'HOOKS':     '../hooks/',
            'PERL5LIB':  '../lib/',
            'NGCP_SOCKETFILE': '/tmp/ngcpcfg.socket',
            'NGCP_TESTSUITE': 'true',
            'CONFIG_USER':  'nobody',
            'CONFIG_GROUP': 'root',
            'CONFIG_CHMOD': '0755',
            'CONSTANTS_CONFIG_USER':  'nobody',
            'CONSTANTS_CONFIG_GROUP': 'root',
            'CONSTANTS_CONFIG_CHMOD': '0755',
            'NETWORK_CONFIG_USER':  'nobody',
            'NETWORK_CONFIG_GROUP': 'root',
            'NETWORK_CONFIG_CHMOD': '0755'
        }
        testenv.update(env)

        # if we're already running under root don't execute under fakeroot,
        # causing strange problems when debugging execution e.g. via strace
        if os.getuid() == 0:
            fakeroot = []
        else:
            fakeroot = ['fakeroot']

        p = subprocess.Popen(fakeroot + ['../sbin/ngcpcfg'] + list(args),
                             stdout=subprocess.PIPE,
                             stderr=subprocess.PIPE, env=testenv)
        stdout, stderr = p.communicate(timeout=30)
        stdout, stderr = str(stdout), str(stderr)
        result = namedtuple('ProcessResult',
                            ['returncode', 'stdout', 'stderr'])(
                                p.returncode, stdout, stderr)
        return result

    return run