#!/usr/bin/env python

"""
This application presents a 'console' prompt to the user asking for readrange commands
which create ReadRangeRequest PDUs, then lines up the coorresponding ReadRangeACK
and prints the value.
"""

import sys

from bacpypes.debugging import bacpypes_debugging, ModuleLogger
from bacpypes.consolelogging import ConfigArgumentParser
from bacpypes.consolecmd import ConsoleCmd

from bacpypes.core import run, enable_sleeping
from bacpypes.iocb import IOCB

from bacpypes.pdu import Address
from bacpypes.object import get_object_class, get_datatype
from bacpypes.apdu import ReadRangeRequest, ReadRangeACK

from bacpypes.app import BIPSimpleApplication
from bacpypes.service.device import LocalDeviceObject

# some debugging
_debug = 0
_log = ModuleLogger(globals())

# globals
this_application = None

#
#   ReadRangeConsoleCmd
#

@bacpypes_debugging
class ReadRangeConsoleCmd(ConsoleCmd):

    def do_readrange(self, args):
        """readrange <addr> <type> <inst> <prop> [ <indx> ]"""
        args = args.split()
        if _debug: ReadRangeConsoleCmd._debug("do_readrange %r", args)

        try:
            addr, obj_type, obj_inst, prop_id = args[:4]

            if obj_type.isdigit():
                obj_type = int(obj_type)
            elif not get_object_class(obj_type):
                raise ValueError("unknown object type")

            obj_inst = int(obj_inst)

            datatype = get_datatype(obj_type, prop_id)
            if not datatype:
                raise ValueError("invalid property for object type")

            # build a request
            request = ReadRangeRequest(
                objectIdentifier=(obj_type, obj_inst),
                propertyIdentifier=prop_id,
                )
            request.pduDestination = Address(addr)

            if len(args) == 5:
                request.propertyArrayIndex = int(args[4])
            if _debug: ReadRangeConsoleCmd._debug("    - request: %r", request)

            # make an IOCB
            iocb = IOCB(request)
            if _debug: ReadRangeConsoleCmd._debug("    - iocb: %r", iocb)

            # give it to the application
            this_application.request_io(iocb)

            # wait for it to complete
            iocb.wait()

            # do something for success
            if iocb.ioResponse:
                apdu = iocb.ioResponse

                # should be an ack
                if not isinstance(apdu, ReadRangeACK):
                    if _debug: ReadRangeConsoleCmd._debug("    - not an ack")
                    return

                # find the datatype
                datatype = get_datatype(apdu.objectIdentifier[0], apdu.propertyIdentifier)
                if _debug: ReadRangeConsoleCmd._debug("    - datatype: %r", datatype)
                if not datatype:
                    raise TypeError("unknown datatype")

                # cast out the data into a list
                value = apdu.itemData[0].cast_out(datatype)

                # dump it out
                for i, item in enumerate(value):
                    sys.stdout.write("[%d]\n" % (i,))
                    item.debug_contents(file=sys.stdout, indent=2)
                sys.stdout.flush()

            # do something for error/reject/abort
            if iocb.ioError:
                sys.stdout.write(str(iocb.ioError) + '\n')

        except Exception as error:
            ReadRangeConsoleCmd._exception("exception: %r", error)

#
#   __main__
#

def main():
    global this_application

    # parse the command line arguments
    args = ConfigArgumentParser(description=__doc__).parse_args()

    if _debug: _log.debug("initialization")
    if _debug: _log.debug("    - args: %r", args)

    # make a device object
    this_device = LocalDeviceObject(
        objectName=args.ini.objectname,
        objectIdentifier=int(args.ini.objectidentifier),
        maxApduLengthAccepted=int(args.ini.maxapdulengthaccepted),
        segmentationSupported=args.ini.segmentationsupported,
        vendorIdentifier=int(args.ini.vendoridentifier),
        )

    # make a simple application
    this_application = BIPSimpleApplication(this_device, args.ini.address)

    # get the services supported
    services_supported = this_application.get_services_supported()
    if _debug: _log.debug("    - services_supported: %r", services_supported)

    # let the device object know
    this_device.protocolServicesSupported = services_supported.value

    # make a console
    this_console = ReadRangeConsoleCmd()
    if _debug: _log.debug("    - this_console: %r", this_console)

    # enable sleeping will help with threads
    enable_sleeping()

    _log.debug("running")

    run()

    _log.debug("fini")

if __name__ == "__main__":
    main()