# -*- coding: utf-8 -*-
'''
Send events covering service status
'''

# Import Python Libs
from __future__ import absolute_import
import logging

# Import third party libs
# pylint: disable=import-error
try:
    import salt.utils.psutil_compat as psutil
    HAS_PSUTIL = True
except ImportError:
    HAS_PSUTIL = False
# pylint: enable=import-error

log = logging.getLogger(__name__)  # pylint: disable=invalid-name

__virtualname__ = 'ps'


def __virtual__():
    if not HAS_PSUTIL:
        return (False, 'cannot load network_info beacon: psutil not available')
    return __virtualname__


def __validate__(config):
    '''
    Validate the beacon configuration
    '''
    # Configuration for ps beacon should be a list of dicts
    if not isinstance(config, dict):
        return False, ('Configuration for ps beacon must be a dictionary.')
    return True, 'Valid beacon configuration'


def beacon(config):
    '''
    Scan for processes and fire events

    Example Config

    .. code-block:: yaml

        beacons:
          ps:
            salt-master: running
            mysql: stopped

    The config above sets up beacons to check that
    processes are running or stopped.
    '''
    ret = []
    procs = []
    for proc in psutil.process_iter():
        _name = proc.name()
        if _name not in procs:
            procs.append(_name)

    for process in config:
        ret_dict = {}
        if config[process] == 'running':
            if process not in procs:
                ret_dict[process] = 'Stopped'
                ret.append(ret_dict)
        elif config[process] == 'stopped':
            if process in procs:
                ret_dict[process] = 'Running'
                ret.append(ret_dict)
        else:
            if process not in procs:
                ret_dict[process] = False
                ret.append(ret_dict)
    return ret
