# -*- coding: utf-8 -*-

import sys
import os

from hardware import Hardware

def check_dependencies():
    """
    Check for needed external dependencies.
    """
    print("Check dependencies…")
    check_os()
    check_user()
    check_connected_hardware()
    print("… checked.\n")

def check_user():
    """
    Check for running user. SU should not be run as root.
    """
    if os.getuid() == 0:
        print("Do not run SU as root")
        sys.exit()
    else:
        print("  * user id %s" % os.getuid())

def check_os():
    """
    We do not support Windows
    """
    if os.name != "posix":
        print("Only Linux is supported at the moment!")
        sys.exit()
    else:
        print("  * posix system")

def check_connected_hardware():
    """
    Output connected and supported rf hardware.
    """
    devices = Hardware().get_connected_supported_devices()
    if len(devices) == 0:
        print("  * no rf hardware connected")
    else:
        print("  * connected rf hardware:")
        for device in devices:
            print("    - %s (%s)" % (device['name'], device['id']))