#! /usr/bin/env python3
#

import sys, time, select

if ( len(sys.argv) == 3 ):
    read_field_description = sys.argv[1]
    write_field_description = sys.argv[2]
    sleep_time = 1.0

elif ( len(sys.argv) == 4 ):
    read_field_description = sys.argv[1]
    write_field_description = sys.argv[2]
    sleep_time = float( sys.argv[3] )

else:
    print ( "" )
    print ( "Usage:  test_rw read_field write_field [sleep_time]" )
    print ( "" )
    sys.exit(0)

#  Add the Mp modules directory to the Python module load path.

sys.path[:0] = [ "/opt/mx/lib/mp" ]

import Mp

database_name = "/opt/mx/etc/mxmotor.dat"

mx_database = Mp.setup_database( database_name )

#====

read_name_list = read_field_description.split( "." )

read_record_name = read_name_list[0]

read_record = mx_database.get_record( read_record_name )

read_field_name = read_name_list[1]

#====

write_name_list = write_field_description.split( "." )

write_record_name = write_name_list[0]

write_record = mx_database.get_record( write_record_name )

write_field_name = write_name_list[1]

#====

while (1):

    print( read_record.read_field( read_field_name ) )

    time.sleep( sleep_time )

    if ( select.select( [sys.stdin,],[],[],0.0 )[0] ):

        value_to_write = sys.stdin.readline().rstrip()

        print( "writing '%s' to '%s.%s'" \
                % ( value_to_write, write_record_name, write_field_name ) )

        try:
            write_record.write_field( write_field_name, value_to_write )
        except:
            pass