# -*- coding: utf-8 -*-
'''
The service module for NetBSD

.. important::
    If you feel that Salt should be using this module to manage services on a
    minion, and it is using a different module (or gives an error similar to
    *'service.start' is not available*), see :ref:`here
    <module-provider-override>`.
'''
from __future__ import absolute_import, print_function, unicode_literals

# Import python libs
import os
import glob
import fnmatch
import re

__func_alias__ = {
    'reload_': 'reload'
}

# Define the module's virtual name
__virtualname__ = 'service'


def __virtual__():
    '''
    Only work on NetBSD
    '''
    if __grains__['os'] == 'NetBSD' and os.path.exists('/etc/rc.subr'):
        return __virtualname__
    return (False, 'The netbsdservice execution module failed to load: only available on NetBSD.')


def start(name):
    '''
    Start the specified service

    CLI Example:

    .. code-block:: bash

        salt '*' service.start <service name>
    '''
    cmd = '/etc/rc.d/{0} onestart'.format(name)
    return not __salt__['cmd.retcode'](cmd)


def stop(name):
    '''
    Stop the specified service

    CLI Example:

    .. code-block:: bash

        salt '*' service.stop <service name>
    '''
    cmd = '/etc/rc.d/{0} onestop'.format(name)
    return not __salt__['cmd.retcode'](cmd)


def restart(name):
    '''
    Restart the named service

    CLI Example:

    .. code-block:: bash

        salt '*' service.restart <service name>
    '''
    cmd = '/etc/rc.d/{0} onerestart'.format(name)
    return not __salt__['cmd.retcode'](cmd)


def reload_(name):
    '''
    Reload the named service

    CLI Example:

    .. code-block:: bash

        salt '*' service.reload <service name>
    '''
    cmd = '/etc/rc.d/{0} onereload'.format(name)
    return not __salt__['cmd.retcode'](cmd)


def force_reload(name):
    '''
    Force-reload the named service

    CLI Example:

    .. code-block:: bash

        salt '*' service.force_reload <service name>
    '''
    cmd = '/etc/rc.d/{0} forcereload'.format(name)
    return not __salt__['cmd.retcode'](cmd)


def status(name, sig=None):
    '''
    Return the status for a service.
    If the name contains globbing, a dict mapping service name to True/False
    values is returned.

    .. versionchanged:: 2018.3.0
        The service name can now be a glob (e.g. ``salt*``)

    Args:
        name (str): The name of the service to check
        sig (str): Signature to use to find the service via ps

    Returns:
        bool: True if running, False otherwise
        dict: Maps service name to True if running, False otherwise

    CLI Example:

    .. code-block:: bash

        salt '*' service.status <service name> [service signature]
    '''
    if sig:
        return bool(__salt__['status.pid'](sig))

    contains_globbing = bool(re.search(r'\*|\?|\[.+\]', name))
    if contains_globbing:
        services = fnmatch.filter(get_all(), name)
    else:
        services = [name]
    results = {}
    for service in services:
        cmd = '/etc/rc.d/{0} onestatus'.format(service)
        results[service] = not __salt__['cmd.retcode'](cmd, ignore_retcode=True)
    if contains_globbing:
        return results
    return results[name]


def _get_svc(rcd, service_status):
    '''
    Returns a unique service status
    '''
    ena = None
    lines = __salt__['cmd.run']('{0} rcvar'.format(rcd)).splitlines()
    for rcvar in lines:
        if rcvar.startswith('$') and '={0}'.format(service_status) in rcvar:
            ena = 'yes'
        elif rcvar.startswith('#'):
            svc = rcvar.split(' ', 1)[1]
        else:
            continue

    if ena and svc:
        return svc
    return None


def _get_svc_list(service_status):
    '''
    Returns all service statuses
    '''
    prefix = '/etc/rc.d/'
    ret = set()
    lines = glob.glob('{0}*'.format(prefix))
    for line in lines:
        svc = _get_svc(line, service_status)
        if svc is not None:
            ret.add(svc)

    return sorted(ret)


def get_enabled():
    '''
    Return a list of service that are enabled on boot

    CLI Example:

    .. code-block:: bash

        salt '*' service.get_enabled
    '''
    return _get_svc_list('YES')


def get_disabled():
    '''
    Return a set of services that are installed but disabled

    CLI Example:

    .. code-block:: bash

        salt '*' service.get_disabled
    '''
    return _get_svc_list('NO')


def available(name):
    '''
    Returns ``True`` if the specified service is available, otherwise returns
    ``False``.

    CLI Example:

    .. code-block:: bash

        salt '*' service.available sshd
    '''
    return name in get_all()


def missing(name):
    '''
    The inverse of service.available.
    Returns ``True`` if the specified service is not available, otherwise returns
    ``False``.

    CLI Example:

    .. code-block:: bash

        salt '*' service.missing sshd
    '''
    return name not in get_all()


def get_all():
    '''
    Return all available boot services

    CLI Example:

    .. code-block:: bash

        salt '*' service.get_all
    '''
    return _get_svc_list('')


def _rcconf_status(name, service_status):
    '''
    Modifies /etc/rc.conf so a service is started or not at boot time and
    can be started via /etc/rc.d/<service>
    '''
    rcconf = '/etc/rc.conf'
    rxname = '^{0}=.*'.format(name)
    newstatus = '{0}={1}'.format(name, service_status)
    ret = __salt__['cmd.retcode']('grep \'{0}\' {1}'.format(rxname, rcconf))
    if ret == 0:  # service found in rc.conf, modify its status
        __salt__['file.replace'](rcconf, rxname, newstatus)
    else:
        ret = __salt__['file.append'](rcconf, newstatus)

    return ret


def enable(name, **kwargs):
    '''
    Enable the named service to start at boot

    CLI Example:

    .. code-block:: bash

        salt '*' service.enable <service name>
    '''
    return _rcconf_status(name, 'YES')


def disable(name, **kwargs):
    '''
    Disable the named service to start at boot

    CLI Example:

    .. code-block:: bash

        salt '*' service.disable <service name>
    '''
    return _rcconf_status(name, 'NO')


def enabled(name, **kwargs):
    '''
    Return True if the named service is enabled, false otherwise

    CLI Example:

    .. code-block:: bash

        salt '*' service.enabled <service name>
    '''
    return _get_svc('/etc/rc.d/{0}'.format(name), 'YES')


def disabled(name):
    '''
    Return True if the named service is enabled, false otherwise

    CLI Example:

    .. code-block:: bash

        salt '*' service.disabled <service name>
    '''
    return _get_svc('/etc/rc.d/{0}'.format(name), 'NO')


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