import subprocess

from freenasUI.middleware.notifier import notifier
from freenasUI.system.alert import alertPlugins, Alert, BaseAlert
from freenasUI.services.models import services


class SMARTDAlert(BaseAlert):

    def run(self):

        alerts = []

        if (services.objects.get(srv_service='smartd').srv_enable):
            # sysctl kern.vm_guest will return a hypervisor name, or the string "none" if FreeNAS is running on bare iron.
            p0 = subprocess.Popen(["/sbin/sysctl",  "-n",  "kern.vm_guest"], stdin=subprocess.PIPE, stdout=subprocess.PIPE, encoding='utf8')
            status = p0.communicate()[0].strip()
            # This really isn't confused with python None
            if status != "none":
                # We got something other than "none", maybe "vmware", "xen", "vbox".  Regardless, smartd not running
                # in these environments isn't a huge deal.  So we'll skip alerting.
                return None
            if hasattr(notifier, 'failover_status') and notifier().failover_status() != 'MASTER':
                return None
            p1 = subprocess.Popen(["/usr/sbin/service", "smartd-daemon", "status"], stdin=subprocess.PIPE, stdout=subprocess.PIPE, encoding='utf8')
            status = p1.communicate()[0]
            if p1.returncode == 1:
                alerts.append(Alert(Alert.WARN, status))
            else:
                return None
        else:
            return None

        return alerts

alertPlugins.register(SMARTDAlert)
