#!/usr/bin/env python

"""
This application presents a 'console' prompt to the user asking for read commands
which create ReadPropertyRequest PDUs, then lines up the coorresponding ReadPropertyACK
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.pdu import Address
from bacpypes.app import LocalDeviceObject, BIPSimpleApplication
from bacpypes.object import get_object_class

from bacpypes.apdu import ReadPropertyRequest, Error, AbortPDU, ReadPropertyACK
from bacpypes.primitivedata import Tag

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

# globals
this_device = None
this_application = None
this_console = None

#
#   ReadPropertyAnyApplication
#

@bacpypes_debugging
class ReadPropertyAnyApplication(BIPSimpleApplication):

    def __init__(self, *args):
        if _debug: ReadPropertyAnyApplication._debug("__init__ %r", args)
        BIPSimpleApplication.__init__(self, *args)

        # keep track of requests to line up responses
        self._request = None

    def request(self, apdu):
        if _debug: ReadPropertyAnyApplication._debug("request %r", apdu)

        # save a copy of the request
        self._request = apdu

        # forward it along
        BIPSimpleApplication.request(self, apdu)

    def confirmation(self, apdu):
        if _debug: ReadPropertyAnyApplication._debug("confirmation %r", apdu)

        if isinstance(apdu, Error):
            sys.stdout.write("error: %s\n" % (apdu.errorCode,))
            sys.stdout.flush()

        elif isinstance(apdu, AbortPDU):
            apdu.debug_contents()

        elif (isinstance(self._request, ReadPropertyRequest)) and (isinstance(apdu, ReadPropertyACK)):
            # peek at the value tag
            value_tag = apdu.propertyValue.tagList.Peek()
            if _debug: ReadPropertyAnyApplication._debug("    - value_tag: %r", value_tag)

            # make sure that it is application tagged
            if value_tag.tagClass != Tag.applicationTagClass:
                sys.stdout.write("value is not application encoded\n")

            else:
                # find the datatype
                datatype = Tag._app_tag_class[value_tag.tagNumber]
                if _debug: ReadPropertyAnyApplication._debug("    - datatype: %r", datatype)
                if not datatype:
                    raise TypeError("unknown datatype")

                # cast out the value
                value = apdu.propertyValue.cast_out(datatype)
                if _debug: ReadPropertyAnyApplication._debug("    - value: %r", value)

                sys.stdout.write(str(value) + '\n')

            sys.stdout.flush()


#
#   ReadPropertyAnyConsoleCmd
#

@bacpypes_debugging
class ReadPropertyAnyConsoleCmd(ConsoleCmd):

    def do_read(self, args):
        """read <addr> <type> <inst> <prop> [ <indx> ]"""
        args = args.split()
        if _debug: ReadPropertyAnyConsoleCmd._debug("do_read %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)

            if prop_id.isdigit():
                prop_id = int(prop_id)

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

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

            # give it to the application
            this_application.request(request)

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


#
#   __main__
#

def main():
    # 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 = ReadPropertyAnyApplication(this_device, args.ini.address)
    if _debug: _log.debug("    - this_application: %r", this_application)

    # 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 = ReadPropertyAnyConsoleCmd()
    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()