#!/usr/bin/env python
# NPM 4000 powerbar managment script, to be used instead of the windows
# application. 
#
# TODO: Not all features are ported yet (like amp monitoring)
# TODO: Error handling not implemented
#
# Licence: BSD
# Version: $Id: serial-npm4000.py 162 2010-07-16 13:53:19Z rick $
# Rick van der Zwet <info@rickvanderzwet.nl>

import serial
import sys
import time
import random
import getopt

# Set to true to enable verbose communication aka debugging
DEBUG = False

# Default for options
opt_serial_port = '/dev/ttyUSB0'
opt_password = 0x12345678
opt_address_code = 0xFFFF
opt_baudrate = 19200
opt_delay = 0.0

# Serial connection port status is cached globally to avoid overhead
ser = None
port_status_synced = False
ports_status = None
ports_ampere = None
# Segment A, B, C
grid_status = None

def make_checksum(command):
    """ Generate CRC checksum using XOR on all bytes """
    crc = 0
    for item in command:
        crc ^= item
    return crc



def debug(msg):
    """ Print debug statement if DEBUG is set """
    if DEBUG:
      print msg



def hex_to_str(command):
    """ Human readable representation of command """
    return " ".join(["%02x" % item for item in command])



def str_to_hex(s):
    """ Hexadecimal string representation of 's' """
    return [ord(x) for x in s]



def port_to_hex(port_number):
  """ Convert integer port number to hexadecimal presentation as internal
      location 
  """
  if port_number < 1:
    assert False, "Invalid port port_number (%i)" % port_number
  if port_number <= 8:
    port = 0xa0 + port_number
  elif port_number <= 16:
    port = 0xb0 + (port_number - 8)
  elif port_number <= 24:
    port = 0xc0 + (port_number - 16)
  else:
    assert False, "Invalid port port_number (%i)" % port_number
  debug("%i - %02x" % (port_number, port))
  return port



def hex_to_port(port):
  """ Convert hexadecimal port to human port number """
  base = port & 0xf0
  index = port & 0x0f
  if (base ^ 0xa0) == 0:
    port_number = index + 0
  elif (base ^ 0xb0) == 0:
     port_number = index + 8
  elif (base ^ 0xc0) == 0:
     port_number = index + 16
  else:
    assert False, "Invalid port (%02x)" % port
  debug("%02x - %i" % (port, port_number))
  return port_number



def send_raw_command(raw_command, response_size=1024):
    """ Send raw command to serial device and wait for response """

    debug("Going to send: " + hex_to_str(raw_command))
    send_line = "".join([chr(item) for item in raw_command])
    ser.write(send_line)
    recv_line = ser.read(response_size)
    recv_command = str_to_hex(recv_line)
    debug("Received: %s (%i)" % (hex_to_str(recv_command), len(recv_line)))
    return(recv_command)



def address_to_num(address):
   """ Convert internal address representation to integer """
   return (address[0] << 8) ^ address[1]



def num_to_address(npm_number):
   """ Convert address number to internal representation """
   return [npm_number >> 8, npm_number & 0x00ff]



def bin_reverse(number,width=8):
  """Little hacking using string logic to binary reverse number"""
  return int(bin(number)[2:].zfill(width)[::-1],2)


# Login cycle
#command = action_login + device_id + password
#send_command(ser, command)
# Reference implementation lines
# A = action, B = address, C = password, P = port
# Mostly of type [A, A, B, B, C, C, C, C] or [A, A, B, B] or [A, A, B, B, P]
# (command, return_type, timeout)
line = dict()
line['login'] = ([0x55, 0x07, 0xff, 0xff, 0x12, 0x34, 0x56, 0x78], 5, 1)
line['status'] = ([0xd1, 0x03, 0xff, 0xff], 42, 1)
line['allon'] = ([0xb1, 0x03, 0xff, 0xff], 6, 13)
line['alloff'] = ([0xc1, 0x03, 0xff, 0xff], 6, 13)
line['port_on'] = ([0xb2, 0x04, 0xff, 0xff, 0xa1], 6, 1)
line['port_off'] = ([0xc2, 0x04, 0xff,0xff, 0xa1], 6, 1)
line['power_on_interval_125'] = ([0xd6, 0x04, 0xff, 0xff, 0xfa, 0x28], 5, 1)
line['power_on_interval_05'] = ([0xd6, 0x04, 0xff, 0xff, 0x01, 0xd3], 5, 1)
line['change_address_code'] = ([0x05, 0x00, 0xff, 0xff, 0x00, 0x04], 5, 1)
line['modify_password'] = ([0xd3, 0x07, 0xff, 0xff, 0x11, 0x11, 0x11, 0x11], 5, 1)

def num_to_hex(number):
  """ Number to internal hexadecimal representation """
  if number == None:
    return []
  length = len(hex(number)[2:]) + (len(hex(number)[2:]) % 2)
  return [int(hex(number)[2:].zfill(length)[x:x+2],16) for x in range(0,length,2)]

#print hex_to_str(num_to_hex(opt_password))
#exit(0)



def send_command(action, argument=[]):
  """ Send CRC computed command to serial device and wait for response """
  (command, response_size, timeout) = line[action]
  if not isinstance(argument, list):
    argument = num_to_hex(argument)
  command = command[0:2] + num_to_hex(opt_address_code) + argument
  serial.timeout = timeout
  raw_command = command + [make_checksum(command)]
  return send_raw_command(raw_command, response_size)


def action_login():
  """ Login to device """
  return send_command('login', opt_password)

def action_status():
  """ Get port status from device """
  action_login()
  return send_command('status')

def action_port_on(port):
  """ Enable port on device """
  global port_status_synced
  port_status_synced = False

  action_login()
  return send_command('port_on', port_to_hex(port))

def action_port_off(port):
  """ Disable port on device """
  global port_status_synced
  port_status_synced = False

  action_login()
  return send_command('port_off', port_to_hex(port))

def action_toggle_port(port):
  """ Toggle port state """
  if get_port_status(port):
    action_port_off(port)
  else:
    action_port_on(port)

def get_ports_status():
   global ports_status, port_status_synced, ports_ampere, grid_status
   ports_status_synced = False
   # Example port 1 is off
   # d1 28 ff ff fe ff ff
   #             ^^ ^^ ^^
   # TODO: Implement Ampere monitoring
   #[01:38:14] Send: 55 07 ff ff 12 34 56 78 5a ff ff d2 00
   #[01:38:14] Recv: ff ff a9 d1 28 ff ff 00 07 00 11 00 00 00 00 00 00 00 00
   #                 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 
   #                 28 00 28 00 00 10 ff
   #[01:38:14] Comm: Refresh
   port_array = [False] * 25
   ports_ampere = [0] * 25
   grid_status = [0] * 3

   action_login()
   retval = send_command('status')
   status_array = bin_reverse((bin_reverse(retval[4]) << 16) ^ (bin_reverse(retval[5]) << 8) ^ bin_reverse(retval[6]),24)
   for port in range(0,24):
      if (status_array & (1 << port)) > 0:
        port_array[port+1] = True
   # retval[7] is the sensor state?
   ports_ampere = [0] + retval[8:16] + retval[17:25] + retval[26:34]
   grid_status = [retval[16], retval[25], retval[34]]

   # Update global state
   ports_status = port_array
   port_status_synced = True

   return port_array



def get_port_status(port):
   """ Get specific port status """
   global ports_status, port_status_synced

   if not port_status_synced:
     get_ports_status()
   return ports_status[port]



def get_port_ampere(port):
   """ Get specific port ampere usage """
   global ports_ampere, port_status_synced

   if not port_status_synced:
     get_ports_status()
   return ports_ampere[port]



def get_grid_status():
   """ Get grid ampere usage """
   global grid_status, ports_status_synced
   
   if not port_status_synced:
     get_ports_status()
   return grid_status
  


def bool_to_str(boolean, raw=False):
   if not raw:
      return str(boolean)
   elif boolean:
      return "1"
   else:
      return "0"
     

def usage(msg="",exitcode=None):
    if msg:
      msg = "[ERROR] %s" % msg
    print """%(msg)s
Usage %(argv)s arguments
Version: $Id: serial-npm4000.py 162 2010-07-16 13:53:19Z rick $

Arguments:
  [-h|--help]                   Reading right know
  [-a|--ampere]			Display ampere readings
  [-d|--debug]                  Print extra communication output
  [-r|--raw]                    Status(es) is bits like output
  --serialport=<path>           Serial Port to connect to [%(serialport)s]
  --password=<hex>              Password to use in hex notation [%(password)s]
  --addresscode=<hex>           Internal device number in hex notation [%(addresscode)s]
  --delay=<int>			Delay used between port operations [%(delay)s]
  --baudrate=<int>		Bautrate used for communication (19200,9600) [%(baudrate)s]
  [-s <port>|--status=<port>]   Current port(s) configuration
  [-t <port>|--toggle=<port>]   Toggle port(s)
  [-o <port>|--on=<port>]       Turn on port(s)
  [-f <port>|--off=<port>]      Turn off port(s)
  --allon			Turn all ports on using internal safety [TODO: Implement]
  --alloff			Turn all ports off using internal safety [TODO: Implement]
  --changepassword=		Change password [TODO: Implement]
  --changeaddresscode=		Change addresscode [TODO: Implement]
  --changetimerdelay=		Change internal timer delay [TODO: Implement]
  --pinballtest=<int>		Randomly toggle ports for number of times]
  --wheel_of_fortune		Wheel of fortune implementation
  [-p <port>|--port=<port>]     Ports needed to be used

Note: [TODO: Implement] bit codes are in the source code, feel free to drop me
an email <info@rickvanderzwet.nl> if you really to need to be in there.

Note: <port> has different notations:
  Numeric value of port         1,2,3,4,5,..
  Actual value of port          A1,..,A8,B1,..,B8,C1,..,C8 
  All ports                     all

%(msg)s
    """ % { 'argv' : sys.argv[0],
            'msg' : msg,
            'serialport' : opt_serial_port,
            'password' : opt_password,
            'addresscode' : opt_address_code,
            'delay' : opt_delay,
            'baudrate' : opt_baudrate,
           }
    if exitcode != None:
        sys.exit(exitcode)   

def main():
    global DEBUG, ser, opt_serial_port, opt_password, opt_address_code, opt_baudrate, opt_delay, opt_pinballtest
    try:
        opts, args = getopt.getopt(sys.argv[1:], 
            "adhf:s:t:ro:p:v", 
	     ["ampere", "debug", "delay=", "help", "verbose", "serialport=",
	      "port=", "password=", "addresscode=","toggle=","off=", "on=",
	      "status=", "buadrate=", "raw=", "pinballtest=",
              "wheel_of_fortune"])
    except getopt.GetoptError, err:
        usage(str(err),2)

    opt_port = None
    opt_action = None
    opt_raw = False
    opt_ampere = False
    opt_pinballtest = None
    for o, a in opts:
        debug("%s : %s" % (o, a))
        if o in ["-a", "--ampere"]:
            opt_ampere = True
        elif o in ["-d", "--debug"]:
            DEBUG = True
        elif o in ["--delay"]:
            opt_delay = float(a)
        elif o in ["-h", "--help"]:
            usage("",0)
        elif o in ["--addresscode"]:
            opt_address_code = int(a,16)
        elif o in ["--password"]:
            opt_passwd = int(a,16)
        elif o in ["-p","--port"]:
            opt_port = a
        elif o in ["--pinballtest"]:
            opt_action = 'pinballtest'
            opt_pinballtest = int(a)
        elif o in ["--buadrate"]:
            opt_baudrate = a
        elif o in ["--serialport"]:
            opt_serial_port = a
        elif o in ["-s", "--status"]:
            opt_action = "status"
            opt_port = a
        elif o in ["-t","--toggle"]:
            opt_action = "toggle"
            opt_port = a
        elif o in ["-f","--off"]:
            opt_action = "off"
            opt_port = a
        elif o in ["-r","--raw"]:
            opt_raw = True
        elif o in ["-o","--on"]:
            opt_action = "on"
            opt_port = a
        elif o in ["--wheel_of_fortune"]:
            opt_action = 'wheel_of_fortune'
            opt_port = "all"
        else:
            assert False, "unhandled option"

    if (opt_port == None):
        usage("No port defined",2)
    elif (opt_action == None):
        usage("No action defined",2)


    # Resolve port to proper numbers array
    ports = []
    for port in opt_port.split(','):
      debug("Raw port: %s" % port)
      if port == "all":
          ports.extend(range(1,25))
      elif port[0] in "ABCabc":
          print hex_to_port(int(port,16))
          ports.append(hex_to_port(int(port,16)))
      else:
          ports.append(int(port))
    debug("Operating on ports " + str(ports))

    # Open serial port
    ser = serial.Serial(opt_serial_port, opt_baudrate, timeout=5)
    debug(serial)

    if opt_action == 'pinballtest':
      for count in range(0,opt_pinballtest): 
        port = random.choice(ports)
        print "[%04i] Toggle port %02i" % (count, port)
        action_toggle_port(port)
        # Backoff time
        time.sleep(opt_delay)
      sys.exit(0)
    elif opt_action == 'wheel_of_fortune':
      # First turn all ports off
      for port in ports:
        action_port_off(port)
      
      port = random.choice(ports)
      total_time = 0.0
      for c in range(1,random.randint(10,200)):
        # Not all should be evaluated (50%)
        if random.randint(0,200) > 100:
          continue
        action_port_on(port)
        sleep_time = float(c) / 1000
	total_time += sleep_time
        time.sleep(sleep_time)
        action_port_off(port)
        print "[%03i] Port %i (%f)" % (c, port, sleep_time)
	port = ((port + 1) % 25)
        if port == 0:
          port += 1
 
      print "Total time: %f" % total_time
      # Initial result
      action_port_on(port)
      sys.exit(0)

    # Status needs real integers, hack
    for port in ports:
      if opt_action == "status":
        if opt_raw:
          print bool_to_str(get_port_status(port),opt_raw),
        else:
          ampere_str = ""
          if opt_ampere:
            ampere_str = "[%s]" % get_port_ampere(port)
          print "Port %02i : %s %s" % (port, get_port_status(port), ampere_str)
      elif opt_action == "toggle":
          action_toggle_port(port)
      elif opt_action == "on":
          action_port_on(port)
      elif opt_action == "off":
          action_port_off(port)
      else:
          assert False, "Option '%s' invalid" % opt_action
      # Backoff if we need to be patient
      time.sleep(opt_delay)
      sys.stdout.flush()

    # Be nice and close correctly
    ser.close()

    if opt_ampere:
      if opt_raw:
        print " ".join(map(str, get_grid_status()))
      else:
        print "Grid A: %s" % grid_status[0]
        print "Grid B: %s" % grid_status[1]
        print "Grid C: %s" % grid_status[2]

if __name__ == "__main__":
    main()