import datetime
import os


def __run__(params):
    now = datetime.datetime.now()
    filename = "/var/run/cfengine.lastrun"
    limit = None
    filedate = None

    warn = params.get('warn',-1)
    crit = params.get('crit',2)
    opt = warn
    if os.path.isfile(filename):
        s = os.stat(filename)
        filedate = datetime.datetime.fromtimestamp(s.st_ctime)
        crit = now - datetime.timedelta(hours=crit)
        warn = now - datetime.timedelta(hours=warn)
    
    if (filedate < warn and filedate < crit or crit is None) or (opt == -1) and (filedate < crit):
        return [2, 'Error: CFEngine last execution: {0}'.format(filedate)]
    elif (filedate < warn and filedate > crit) and opt != -1:
        return [1, 'Error: CFEngine last execution: {0}'.format(filedate)]

    return [0, 'OK: CFEngine last execution: {0}'.format(filedate)]