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# Copyright (c) Cloud Linux Software, Inc
# Licensed under CLOUD LINUX LICENSE AGREEMENT
# http://cloudlinux.com/docs/LICENCE.TXT

import json
import os
import platform
import socket
import sys

from . import constants
from . import config
from . import log_utils
from . import utils
from . import process_utils
from . import selinux


VIRTWHAT = '/usr/libexec/kcare/virt-what'


def get_distro():
    if sys.version_info[:2] < (3, 6):  # pragma: no py3 cover
        return platform.linux_distribution()
    else:  # pragma: no distro cover
        import distro

        return distro.linux_distribution(full_distribution_name=False)


@utils.cached
def get_system_uname():
    return platform.uname()[2]


def get_python_version():  # type: () -> str
    return '%s.%s' % (sys.version_info[0], sys.version_info[1])


def app_info(is_json=False):  # type: (bool) -> str
    info = {
        'python_version': get_python_version(),
        'agent_version': constants.VERSION,
    }

    if selinux.is_selinux_enabled():
        rc, stdout, stderr = process_utils.run_command(['ps', '-Z', '--no-headers', '--pid', str(os.getpid())], catch_stdout=True)
        if not rc:
            selinux_context = stdout.split()[0]
        else:
            selinux_context = 'error: %s' % stderr

        info['selinux_context'] = selinux_context

    if is_json:
        return json.dumps(info)

    info_keys = sorted(info)
    info_str = ''
    for info_key in info_keys:
        info_str += '%s: %s\n' % (info_key, info[info_key])

    return info_str.rstrip()


def is_secure_boot():  # mocked: tests/unit/test_load_kmod.py
    # type: () -> bool
    efivars_location = "/sys/firmware/efi/efivars/"
    if not os.path.exists(efivars_location):
        return False
    for filename in os.listdir(efivars_location):
        if filename.startswith('SecureBoot'):
            varfile = os.path.join(efivars_location, filename)
            # Get last byte
            with open(varfile, 'rb') as vfd:
                return vfd.read()[-1:] == b'\x01'
    return False


@utils.cached
def get_hostname():
    # type: () -> str
    # KCARE-1165  If fqdn gathering is forced
    if config.REPORT_FQDN:
        try:
            # getaddrinfo() -> [(family, socktypeget_hostname, proto, canonname, sockaddr), ...]
            hostname = socket.getaddrinfo(socket.gethostname(), 0, 0, 0, 0, socket.AI_CANONNAME)[0][3]
        except socket.gaierror as ge:
            log_utils.logerror(ge)
            hostname = platform.node()
    else:
        hostname = platform.node()
    return hostname


@utils.cached
def get_uptime():
    # type: () -> str
    if os.path.isfile('/proc/uptime'):
        f = open('/proc/uptime', 'r')
        line = f.readline()
        result = str(int(float(line.split()[0])))
        f.close()
        return result
    return '-1'


@utils.cached
def get_virt():
    if os.path.isfile(VIRTWHAT):
        return process_utils.check_output([VIRTWHAT]).strip()
    return 'no-virt-what'  # pragma: no cover


def is_cpanel():
    return os.path.isfile('/usr/local/cpanel/cpanel')


def inside_vz_container():  # mocked: tests/unit/test_load_kmod.py
    return os.path.exists('/proc/vz/veinfo') and not os.path.exists('/proc/vz/version')


def inside_lxc_container():  # mocked: tests/unit/test_load_kmod.py
    return '/lxc/' in open('/proc/1/cgroup').read()


def inside_docker_container():  # mocked: tests/unit/test_load_kmod.py
    return os.path.isfile('/.dockerenv')