#!/usr/bin/python

"""Wifi commands for Quantenna using QCSAPI."""

import os
import subprocess
import time

import utils


# Detect Quantenna device.
#
# qcsapi_pcie_static runs on PCIe hosts, e.g. GFRG250.
# call_qcsapi runs on the LHOST, e.g. GFEX250.
#
# When called without arguments, qcsapi_pcie_static checks for a Quantenna
# device without sending any RPCs. Both programs return 234 only if a Quantenna
# device is present.
_QCSAPI = None
for qcsapi in ['qcsapi_pcie_static', 'call_qcsapi']:
  with open(os.devnull, 'w') as devnull:
    try:
      if subprocess.call([qcsapi], stdout=devnull, stderr=devnull) == 234:
        _QCSAPI = qcsapi
        break
    except OSError:
      continue


def _qcsapi(*args):
  return subprocess.check_output([_QCSAPI] + list(args))


def _set(mode, opt):
  """Enable wifi."""
  _qcsapi('rfenable', '0')
  _qcsapi('restore_default_config', 'noreboot')

  config = {
      'bw': opt.width,
      'channel': '149' if opt.channel == 'auto' else opt.channel,
      'mode': mode,
      'pmf': '0',
      'scs': '0',
  }
  for param, value in config.iteritems():
    _qcsapi('update_config_param', 'wifi0', param, value)

  if int(_qcsapi('is_startprod_done')):
    _qcsapi('reload_in_mode', 'wifi0', mode)
  else:
    _qcsapi('startprod', 'wifi0')
    for _ in xrange(30):
      if int(_qcsapi('is_startprod_done')):
        break
      time.sleep(1)
    else:
      raise utils.BinWifiException('startprod timed out')

  if mode == 'ap':
    _qcsapi('set_ssid', 'wifi0', opt.ssid)
    _qcsapi('set_passphrase', 'wifi0', '0', os.environ['WIFI_PSK'])
    _qcsapi('set_option', 'wifi0', 'ssid_broadcast',
            '0' if opt.hidden_mode else '1')
    _qcsapi('rfenable', '1')
  else:
    _qcsapi('create_ssid', 'wifi0', opt.ssid)
    _qcsapi('ssid_set_passphrase', 'wifi0', opt.ssid, '0',
            os.environ['WIFI_CLIENT_PSK'])
    # In STA mode, 'rfenable 1' is already done by 'startprod'/'reload_in_mode'.
    # 'apply_security_config' must be called instead.
    _qcsapi('apply_security_config', 'wifi0')

  return True


def _stop(_):
  """Disable wifi."""
  _qcsapi('rfenable', '0')
  return True


def has_quantenna():
  return _QCSAPI is not None


def set_wifi(opt):
  return _set('ap', opt)


def set_client_wifi(opt):
  return _set('sta', opt)


def stop_ap_wifi(opt):
  return _stop(opt)


def stop_client_wifi(opt):
  return _stop(opt)