#! /usr/bin/env mpscript
# 
# This script moves the motor to the requested position.
#

import time

#---------------------------------------------------------------------------

def position_callback( callback, args ):

	nf = callback.nf

	position = nf.get_local_value()

	print( "'%s' = %f" % ( nf.name, position ) )

#---------------------------------------------------------------------------

def main( record_list, argv ):

	if ( len(argv) != 2 ):
		print( "" )
		print( "Usage:  mp_move motorname new_position" )
		print( "" )
		sys.exit(1);

	motorname    = argv[0]
	new_position = float( argv[1] )

	#
	# Find the motor and verify that it is a 'network_motor' record.
	#

	motor = record_list.get_record( motorname )

	mx_type = motor.get_field("mx_type")

	if ( mx_type != "network_motor" ):
		print( "%s is not an MX network motor.  Exiting ..." \
								% motorname )
		sys.exit(1)

	#
	# Get the server record and remote motor name for this network motor.
	#

	server_record_name = motor.get_field("server_record")

	server_record = record_list.get_record(server_record_name)

	remote_motor_name = motor.get_field("remote_record_name")

	field_name = "position"

	#
	# Create a network field for the remote motor record's 'position' field.
	#
	
	nf_name = "%s.%s" % ( remote_motor_name, field_name )

	position_nf = Mp.Net( server_record, nf_name )

	#
	# Add a value changed callback for the 'position' network field.
	#

	callback = position_nf.add_callback( Mp.MXCBT_VALUE_CHANGED, \
						position_callback, None )

	#
	# Synchronously start the motor move.
	#

	units = motor.get_field("units")

	print( "Moving motor '%s' to %f %s" \
			% ( motorname, new_position, units ) )

	motor.move_absolute( new_position )

	#
	# Wait for callbacks from the server.
	#

	while (1):
		try:
			record_list.wait_for_messages(1.0)
		except Mp.Timed_Out_Error:
			pass