#!@PYSHEBANG@
# -*- coding: UTF-8
# @GENERATED@
# This file is Copyright 2018 by the GPSD project
# SPDX-License-Identifier: BSD-2-clause
#
# This code runs compatibly under Python 2 and 3.x for x >= 2.
# Preserve this property!
#
# ENVIRONMENT:
#    Options in the UBXOPTS environment variable will be parsed before
#    the CLI options.  A handy place to put your '-f /dev/ttyXX -s SPEED'
#
# To see what constellations are enabled:
#       ubxtool -p CFG-GNSS -f /dev/ttyXX
#
# To disable GLONASS and enable GALILEO:
#       ubxtool -d GLONASS -f /dev/ttyXX
#       ubxtool -e GALILEO -f /dev/ttyXX
#
# To read GPS messages a log file:
#       ubxtool -v 2 -f test/daemon/ublox-neo-m8n.log
#
# References:
#   [1] IS-GPS-200K
# Codacy D203 and D211 conflict, I choose D203
# Codacy D212 and D213 conflict, I choose D212
"""ubxtool -- u-blox configurator and packet decoder.

usage: ubxtool [OPTIONS] [host[:port[:device]]]
"""

from __future__ import absolute_import, print_function, division

import argparse      # to parse CLI options
from functools import reduce  # pylint: disable=redefined-builtin
import operator      # for or_
import os            # for os.environ
import re            # for regular expressions
import struct        # for pack()
import sys

PROG_NAME = 'ubxtool'


try:
    import gps
    import gps.ubx
except ImportError:
    # PEP8 says local imports last
    sys.stderr.write("%s: failed to import gps, check PYTHONPATH\n" %
                     PROG_NAME)
    sys.exit(2)

gps_version = '@VERSION@'
if gps.__version__ != gps_version:
    sys.stderr.write("%s: ERROR: need gps module version %s, got %s\n" %
                     (PROG_NAME, gps_version, gps.__version__))
    sys.exit(1)

# Some old versions of Python fail to accept a bytearray as an input to
# struct.unpack_from, though it can be worked around by wrapping it with
# buffer().  Since the fix is only needed in rare cases, this monkey-patches
# struct.unpack_from() when needed, and otherwise changes nothing.  If
# struct.unpack() were used, it would need similar treatment, as would
# methods from struct.Struct if that were used.
try:
    struct.unpack_from('B', bytearray(1))
except TypeError:
    unpack_from_orig = struct.unpack_from

    def unpack_from_fixed(fmt, buf, offset=0):
        """Unpack_from_fixed."""
        # buffer() is a Python 2 thing.
        return unpack_from_orig(fmt, buffer(buf), offset=offset)

    struct.unpack_from = unpack_from_fixed

# opts['protver'],  protocol version for sent commands
# u-blox 5, firmware 4 to 6 is protver 10 to 12
# u-blox 6, firmware 6 to 7 is protver 12 to 13
# u-blox 6, firmware 1 is protver 14
# u-blox 7, firmware 1 is protver 14
# u-blox 8, is protver 15 to 23
# u-blox 9, firmware 1 is protver 27
# u-blox F9T, firmware 2 is protver 29
# u-blox F9N, firmware 4 is protver 32

# instantiate the GPS class
gps_model = gps.ubx.ubx()

if 'UBXOPTS' in os.environ:
    # grab the UBXOPTS environment variable to be handled as prepended options
    options = os.environ['UBXOPTS'].split(' ') + sys.argv[1:]

else:
    options = sys.argv[1:]


#  "m:")

usage = '%(prog)s [OPTIONS] [host[:port[:device]]]'
epilog = ('BSD terms apply: see the file COPYING in the distribution '
          'root for details.')

parser = argparse.ArgumentParser(add_help=False, epilog=epilog, usage=usage)
parser.add_argument(
    '-?', '-h', '--help',
    action="store_true",
    dest='help',
    default=False,
    help='Show this help message and exit. Use -v 2, or -v 3, for extra help'
)
parser.add_argument(
    '-c', '--command',
    dest='command',
    default=None,
    metavar='CMD',
    help='Send raw command CMD (cls,id...) to receiver'
)
parser.add_argument(
    '-d', '--disable',
    action='append',
    dest='disable',
    default=None,
    metavar='ABLE',
    help='Disable ABLE in the receiver.  May be used multiple times. ',
)
parser.add_argument(
    '-e', '--enable',
    action='append',
    dest='enable',
    default=None,
    metavar='ABLE',
    help='Enable ABLE in the receiver.  May be used multiple times. ',
)
parser.add_argument(
    '--device',
    dest='gpsd_device',
    default=None,
    metavar='DEVICE',
    help='The gpsd device to connect to. [Default %(default)s]',
)
parser.add_argument(
    '-f', '--file',
    dest='input_file_name',
    default=None,
    metavar='FILE',
    help='Read from FILE instead of a gpsd instance.',
)
parser.add_argument(
    '-g', '--getitem',
    action='append',
    dest='get_item',
    default=None,
    metavar='ITEM,LAYER,POSITION',
    help=('Get ITEM from LAYER and POSITION. LAYER and POSITION are '
          'optional.  May be used multiple times.'),
)
parser.add_argument(
    '--host',
    dest='gpsd_host',
    default=None,
    metavar='HOST',
    help='The gpsd host to connect to.',
)
parser.add_argument(
    '-i', '-portid',
    dest='port',
    default=None,
    metavar='PORTID',
    help=('Specifies receiver PORTID (interface) for port-related commands. '
          '[Default %(default)s]'),
)
parser.add_argument(
    '--port',
    dest='gpsd_port',
    default=gps.GPSD_PORT,
    metavar='PORT',
    type=int,
    help='The gpsd port to connect to. [Default %(default)s]',
)
parser.add_argument(
    '-p', '--preset',
    action='append',
    dest='poll',
    metavar='PRESET',
    help='Poll the receiver for PRESET.  May be used multiple times.',
)
parser.add_argument(
    '-P', '--protver',
    dest='protver',
    default=10.0,
    type=float,
    help='Protocol version for sending commands. [Default %(default)s]',
)
parser.add_argument(
    '-r', '--readonly',
    action='store_true',
    dest='read_only',
    default=False,
    help='Read only. Do not send anything to the GPS.',
)
parser.add_argument(
    '-R', '--rawfile',
    dest='raw_file',
    default=None,
    metavar='FILE',
    help='Save raw data from receiver in FILE\n',
)
parser.add_argument(
    '-s', '--inspeed',
    choices=gps_model.speeds,
    dest='input_speed',
    default=9600,
    metavar='SPEED',
    type=int,
    help='Set local serial port speed to SPEED bps.',
)
parser.add_argument(
    '-S', '--setspeed',
    # FIXME: speeds s/b in io class
    choices=gps_model.speeds,
    dest='set_speed',
    metavar='SPEED',
    type=int,
    help='Configure receiver speed to SETSPEED.',
)
parser.add_argument(
    '-t', '--timestamp',
    action='count',
    dest='timestamp',
    default=0,
    help='Timestamp messages with seconds since UNIX epoch.  Use -tt for UTC',
)
parser.add_argument(
    '-v', '--verbosity',
    dest='verbosity',
    default=0,
    metavar='VERB',
    type=int,
    help='Set verbosity level to V, 0 to 5. [Default %(default)s]',
)
parser.add_argument(
    '-V', '--version',
    action='version',
    version="%(prog)s: Version " + gps_version + "\n",
    help='Output version to stderr, then exit',
)
parser.add_argument(
    '-w', '--wait',
    dest='input_wait',
    default=2.0,
    metavar='WAIT',
    type=float,
    help='Wait for WAIT seconds before exiting.. [Default %(default)s]',
)
parser.add_argument(
    '-x', '--delitem',
    action='append',
    dest='del_item',
    default=None,
    metavar='ITEM',
    help=('Delete ITEM from receiver BBR and FLASH layers.  '
          'May be used multiple times. '),
)
parser.add_argument(
    '-z', '--setitem',
    action='append',
    dest='set_item',
    default=None,
    metavar='ITEM,VAL[,LAYER]',
    help=('Set ITEM in receiver to VAL in LAYER.  LAYER is optional. '
          'May be used multiple times. '),
)
parser.add_argument(
    'target',
    nargs='?',
    help='[host[:port[:device]]]',
)

# turn the stupid Namespace into a nice dictionary
opts = vars(parser.parse_args(options))

gps_model.port = opts['port']
gps_model.protver = opts['protver']
gps_model.read_only = opts['read_only']
gps_model.timestamp = opts['timestamp']
gps_model.verbosity = opts['verbosity']

if opts['port']:
    # FIXME: better error message
    valnum = gps_model.port_id_map.get(opts['port'].upper())
    opts['port'] = valnum if valnum is not None else int(opts['port'])

if opts['help']:
    parser.print_help()
    if gps.VERB_DECODE <= opts['verbosity']:
        print('\nABLE for -d/--disable and -e/--enable can be one of:')
        for item in sorted(gps_model.able_commands.keys()):
            print("    %-13s %s" %
                  (item, gps_model.able_commands[item]["help"]))

        print('\nPRESET for -p can be one of:')
        for item in sorted(gps_model.commands.keys()):
            print("    %-13s %s" % (item, gps_model.commands[item]["help"]))
        print('\n')
        if gps.VERB_DECODE < opts['verbosity']:
            print('\nITEM for -g/--getitem, -x/--delitem and -z/--setitem '
                  'can be one of:')
            for item in sorted(gps_model.cfgs):
                print("    %s\n"
                      "        %s" % (item[0], item[5]))
            print('\n')

    print('Options can be placed in the UBXOPTS environment variable.\n'
          'UBXOPTS is processed before the CLI options.')
    sys.exit(0)

if opts['input_file_name']:
    # input file given
    if opts['target']:
        sys.stderr.write('%s: ERROR: both input file and target given.\n' %
                         (PROG_NAME,))
        sys.exit(0)

elif opts['target']:
    # TODO: move to module gps as a function
    # host[:port[:device]]
    # or maybe ::device
    # or maybe \[ipv6\][:port[:device]]
    if '[' == opts['target'][0]:
        # hex, or hex+zoneindex IPv6 address
        # could be like [fe80::1ff:fe23:4567:890a%eth2]
        match = re.match(r'''\[([^]]+)\](.*)''', opts['target'])
        opts['gpsd_host'] = match.group(1)
        parts = match.group(2).split(':')
    else:
        # maybe IPv4 address, maybe hostname
        parts = opts['target'].split(':')
        if parts[0]:
            opts['gpsd_host'] = parts[0]

    if 1 < len(parts):
        if parts[1]:
            opts['gpsd_port'] = parts[1]
        if 2 < len(parts) and parts[2]:
            opts['gpsd_device'] = parts[2]
else:
    # else, use defaults: localhost:2947:
    if not opts['gpsd_host']:
        opts['gpsd_host'] = 'localhost'

if gps.VERB_PROG <= opts['verbosity']:
    # dump versions and all options
    print('%s: Version %s\n' % (PROG_NAME, gps_version))
    print('Options:')
    for option in sorted(opts):
        print("   %s: %s" % (option, opts[option]))

# done parsing arguments from environment and CLI

try:
    # raw log file requested?
    raw = None
    if opts['raw_file']:
        try:
            raw = open(opts['raw_file'], 'wb')
        except IOError:
            sys.stderr.write('%s: failed to open raw file %s\n' %
                             (PROG_NAME, opts['raw_file']))
            sys.exit(1)

    # Check if there is a conflict

    # create the I/O instance
    io_handle = gps.gps_io(
        input_file_name=opts['input_file_name'],
        read_only=opts['read_only'],
        gpsd_host=opts['gpsd_host'],
        gpsd_port=opts['gpsd_port'],
        gpsd_device=opts['gpsd_device'],
        input_speed=opts['input_speed'],
        verbosity_level=opts['verbosity'],
        write_requested=(opts['disable'] or opts['enable'] or opts['poll']))
    gps_model.io_handle = io_handle

    sys.stdout.flush()

    if opts['disable']:
        for disable in opts['disable']:
            if gps.VERB_QUIET < opts['verbosity']:
                print('%s: disable %s\n' % (PROG_NAME, disable))
            args = disable.split(',')
            disable = args[0].upper()

            if disable in gps_model.able_commands:
                command = gps_model.able_commands[disable]
                command["command"](gps_model, 0, disable[1:])
            else:
                sys.stderr.write('%s: disable %s not found\n' %
                                 (PROG_NAME, disable))
                sys.exit(1)

    if opts['enable']:
        for enable in opts['enable']:
            if gps.VERB_QUIET < opts['verbosity']:
                print('%s: enable %s\n' % (PROG_NAME, enable))
            args = enable.split(',')
            enable = args[0].upper()

            if enable in gps_model.able_commands:
                command = gps_model.able_commands[enable]
                command["command"](gps_model, 1, args[1:])
            else:
                sys.stderr.write('%s: enable %s not found\n' %
                                 (PROG_NAME, enable))
                sys.exit(1)

    if opts['poll']:
        for poll in opts['poll']:
            if gps.VERB_QUIET < opts['verbosity']:
                print('%s: poll %s\n' % (PROG_NAME, poll))

            args = poll.split(',')
            poll = args[0].upper()

            if poll in gps_model.commands:
                command = gps_model.commands[poll]
                if (('minVer' in command and
                     opts['protver'] < command['minVer'])):
                    print('%s: WARNING poll %s requires protVer >= %s '
                          'you have %s\n' %
                          (PROG_NAME, poll, command['minVer'],
                           opts['protver']))

                if (('maxVer' in command and
                     opts['protver'] > command['maxVer'])):
                    print('%s: WARNING poll %s requires protVer <= %s '
                          'you have %s\n' %
                          (PROG_NAME, poll, command['maxVer'],
                           opts['protver']))

                if 'opt' in command:
                    command["command"](gps_model, command["opt"])
                elif 'args' in command:
                    # pass on  args, except arg[0]
                    command["command"](gps_model, args[1:])
                else:
                    command["command"](gps_model)
            else:
                sys.stderr.write('%s: poll %s not found\n' %
                                 (PROG_NAME, poll))
                sys.exit(1)

    elif opts['set_speed'] is not None:
        gps_model.send_set_speed(opts['set_speed'])

    elif opts['command'] is not None:
        cmd_list = opts['command'].split(',')
        try:
            cmd_data = [int(v, 16) for v in cmd_list]
        except ValueError:
            badarg = True
        else:
            data_or = reduce(operator.or_, cmd_data)
            badarg = data_or != data_or & 0xFF
        if badarg or len(cmd_list) < 2:
            sys.stderr.write('%s: Argument format (hex bytes) is'
                             ' class,id[,payload...]\n' % PROG_NAME)
            sys.exit(1)
        payload = bytearray(cmd_data[2:])
        if gps.VERB_QUIET < opts['verbosity']:
            print('%s: command %s\n' % (PROG_NAME, opts['command']))
        gps_model.gps_send(cmd_data[0], cmd_data[1], payload)

    elif opts['del_item']:
        keys = []
        for name in opts['del_item']:
            item = gps_model.cfg_by_name(name)
            if item:
                keys.append(item[1])
            else:
                sys.stderr.write('%s: ERROR: item %s unknown\n' %
                                 (PROG_NAME, opts['del_item']))
                sys.exit(1)
        gps_model.send_cfg_valdel(keys)

    elif opts['get_item']:
        keys = []
        layer = None
        position = 0
        end = None
        for item in opts['get_item']:
            parts = item.split(',')
            item = gps_model.cfg_by_name(parts[0].upper())
            if item:
                keys.append(item[1])
            else:
                sys.stderr.write('%s: ERROR: item %s unknown\n' %
                                 (PROG_NAME, parts[0]))
                sys.exit(1)
            try:
                if 1 < len(parts):
                    layer = int(parts[1])
                    if 2 < len(parts):
                        position = int(parts[2])
                        if 3 < len(parts):
                            end = int(parts[3])
            except ValueError:
                sys.stderr.write('%s: ERROR: -g %s, non numeric parameter\n' %
                                 (PROG_NAME, parts[0]))
                sys.exit(1)

        print("layer %s position %d end %s " % (layer, position, end))
        if end:
            for p in range(position, end, 64):
                gps_model.send_cfg_valget(keys, layer, p)
        else:
            gps_model.send_cfg_valget(keys, layer, position)

    elif opts['set_item']:
        nvs = []
        for nv in opts['set_item']:
            parts = nv.split(',')
            if 1 >= len(parts):
                sys.stderr.write('%s: ERROR: item %s missing value to set\n' %
                                 (PROG_NAME, parts[0]))
                sys.exit(1)
            item = gps_model.cfg_by_name(parts[0])
            if item:
                nvs.append(nv)
            else:
                sys.stderr.write('%s: ERROR: item %s unknown\n' %
                                 (PROG_NAME, parts[0]))
                sys.exit(1)
        gps_model.send_cfg_valset(nvs)

    exit_code = io_handle.read(gps_model.decode_msg,  # decode function
                               opts['input_wait'])    # raw input

    if ((gps.VERB_RAW <= opts['verbosity']) and io_handle.out):
        # dump raw left overs
        print("Left over data:")
        print(io_handle.out)

    sys.stdout.flush()
    io_handle.ser.close()

except KeyboardInterrupt:
    print('')
    exit_code = 1

sys.exit(exit_code)
# vim: set expandtab shiftwidth=4
