"""ioHub Common Eye Tracker Interface for EyeLink(C) Systems"""
# Part of the PsychoPy.iohub library
# Copyright (C) 2012-2016 iSolver Software Solutions
# Distributed under the terms of the GNU General Public License (GPL).
import os
import numpy as np
import pylink
try:
    from psychopy.gui.wxgui import ProgressBarDialog
except ImportError:
    ProgressBarDialog = None

try:
    unicode
except NameError:
    unicode = str

try:
    basestring
except NameError:
    basestring = str

from ......constants import EventConstants, EyeTrackerConstants
from ...... import EXP_SCRIPT_DIRECTORY
from ......errors import print2err, printExceptionDetailsToStdErr
from ..... import Computer, Device
from .... import EyeTrackerDevice
from ....eye_events import *

try:
    pylink.enableUTF8EyeLinkMessages()
except Exception:
    pass


class EyeTracker(EyeTrackerDevice):
    """
    The SR Research EyeLink implementation of the Common Eye Tracker Interface
    can be used by providing the following EyeTracker path as the device
    class in the iohub_config.yaml device settings file:

        eyetracker.hw.sr_research.eyelink
        
    Examples:
        A. Start ioHub with SR Research EyeLink 1000 and run tracker calibration::
    
            from psychopy.iohub import launchHubServer
            from psychopy.core import getTime, wait


            iohub_config = {'eyetracker.hw.sr_research.eyelink.EyeTracker':
                            {'name': 'tracker',
                             'model_name': 'EYELINK 1000 DESKTOP',
                             'runtime_settings': {'sampling_rate': 500, 
                                                  'track_eyes': 'RIGHT'}
                             }
                            }
            io = launchHubServer(**iohub_config)
            
            # Get the eye tracker device.
            tracker = io.devices.tracker
                            
            # run eyetracker calibration
            r = tracker.runSetupProcedure()
            
        B. Print all eye tracker events received for 2 seconds::
                        
            # Check for and print any eye tracker events received...
            tracker.setRecordingState(True)
            
            stime = getTime()
            while getTime()-stime < 2.0:
                for e in tracker.getEvents():
                    print(e)
            
        C. Print current eye position for 5 seconds::
                        
            # Check for and print current eye position every 100 msec.
            stime = getTime()
            while getTime()-stime < 5.0:
                print(tracker.getPosition())
                wait(0.1)
            
            tracker.setRecordingState(False)
            
            # Stop the ioHub Server
            io.quit()
    """

    # >>> Constants:
    EYELINK = 1
    EYELINK_II = 2
    EYELINK_1000 = 3

    # >>> Custom class attributes
    _eyelink = None
    _local_edf_dir = '.'
    _full_edf_name = 'temp'
    _host_edf_name = None
    _active_edf_file = None
    _file_transfer_progress_dialog = None
    # <<<

    # >>> Overwritten class attributes
    DEVICE_TIMEBASE_TO_SEC = 0.001
    EVENT_CLASS_NAMES = [
        'MonocularEyeSampleEvent',
        'BinocularEyeSampleEvent',
        'FixationStartEvent',
        'FixationEndEvent',
        'SaccadeStartEvent',
        'SaccadeEndEvent',
        'BlinkStartEvent',
        'BlinkEndEvent']
    __slots__ = []
    # <<<

    def __init__(self, *args, **kwargs):
        """"""

        EyeTrackerDevice.__init__(self, *args, **kwargs)

        EyeTracker._eyelink = None

        try:
            tracker_config = self.getConfiguration()

            # Connect to the eye tracker; setting the EyeTracker._eyelink class
            # attribute to a pylink.EYELINK device class if EyeTracker._eyelink
            # is None.
            if self.setConnectionState(
                    True) != EyeTrackerConstants.EYETRACKER_OK:
                print2err(
                    " ** EyeLink Error: Could not connect to EyeLink Eye Tracker. EyeLink Eye tracker device will run in 'dummy' mode.")
                tracker_config['enable_interface_without_connection'] = True
                self.setConnectionState(True)

            self._addCommandFunctions()

            # Sets the physical ini settings, like default screen distance,
            # monitor size, and display coordinate bounds.
            self._eyelinkSetScreenPhysicalData()

            # Set whether to run in mouse simulation mode or not.
            simulation_mode = tracker_config.get('simulation_mode', False)
            if simulation_mode is True:
                self._eyelink.sendCommand('aux_mouse_simulation = YES')
            else:
                self._eyelink.sendCommand('aux_mouse_simulation = NO')

            # set that the EyeLink connected button box, button 5
            # (the big button on most of supported gamepads), will initiate
            # an accept fixation command.
            self._eyelink.sendCommand(
                "button_function 5 'accept_target_fixation'")

            # Sets up the file names / paths to be used for the native EyeLink
            # EDF file.
            EyeTracker._local_edf_dir = EXP_SCRIPT_DIRECTORY

            # Sets the 'runtime' configuration section of the eyetracker
            # settings, including eye to track, sample filtering level, etc.
            self._setRuntimeSettings(self._runtime_settings)

            # calibration related settings
            eyelink = self._eyelink
            calibration_config = tracker_config.get('calibration', None)
            if calibration_config:
                for cal_key, cal_val in calibration_config.items():
                    if cal_key == 'auto_pace':
                        if cal_val is True:
                            eyelink.enableAutoCalibration()
                        elif cal_val is False:
                            eyelink.disableAutoCalibration()
                    elif cal_key == 'pacing_speed':  # in seconds.msec
                        eyelink.setAutoCalibrationPacing(int(cal_val * 1000))
                    elif cal_key == 'type':
                        VALID_CALIBRATION_TYPES = dict(
                            THREE_POINTS='HV3',
                            FIVE_POINTS='HV5',
                            NINE_POINTS='HV9',
                            THIRTEEN_POINTS='HV13')
                        eyelink.setCalibrationType(
                            VALID_CALIBRATION_TYPES[cal_val])
                    elif cal_key == 'target_type':
                        pass
                    elif cal_key == 'screen_background_color':
                        pass
                    elif cal_key == 'target_attributes':
                        pass
                    else:
                        print2err(
                            'WARNING: unhandled eye tracker calibration setting: {0}, value: {1}'.format(
                                cal_key, cal_val))

            # native data recording file
            default_native_data_file_name = tracker_config.get(
                'default_native_data_file_name', None)
            if default_native_data_file_name:
                if isinstance(default_native_data_file_name, (str, unicode)):
                    r = default_native_data_file_name.rfind('.')
                    if r > 0:
                        if default_native_data_file_name[r:] == 'edf'.lower():
                            default_native_data_file_name = default_native_data_file_name[
                                :r]

                    if len(default_native_data_file_name) > 7:
                        EyeTracker._full_edf_name = default_native_data_file_name
                        twoDigitRand = np.random.randint(10, 99)
                        EyeTracker._host_edf_name = self._full_edf_name[
                            :3] + twoDigitRand + self._full_edf_name[5:7]
                    else:
                        EyeTracker._full_edf_name = default_native_data_file_name
                        EyeTracker._host_edf_name = default_native_data_file_name
                else:
                    print2err(
                        'ERROR: default_native_data_file_name must be a string or unicode value')

            if self._local_edf_dir and self._full_edf_name:
                EyeTracker._active_edf_file = self._full_edf_name + '.EDF'
            self._eyelink.openDataFile(self._host_edf_name + '.EDF')

            # Creates a fileTransferDialog class that will be used when a connection is closed and
            # a native EDF file needs to be transferred from Host to Experiment
            # PC.
            EyeTracker._eyelink.progressUpdate = self._fileTransferProgressUpdate
        except Exception:
            print2err(
                ' ---- Error during EyeLink EyeTracker Initialization ---- ')
            printExceptionDetailsToStdErr()
            print2err(
                ' ---- Error during EyeLink EyeTracker Initialization ---- ')

    def trackerTime(self):
        """trackerTime returns the current EyeLink Host Application time in
        msec format as a long integer."""
        return self._eyelink.trackerTime()

    def trackerSec(self):
        """trackerSec returns the current EyeLink Host Application time in
        sec.msec format."""
        return self._eyelink.trackerTime() * self.DEVICE_TIMEBASE_TO_SEC

    def setConnectionState(self, enable):
        """setConnectionState connects the ioHub Server to the EyeLink device
        if the enable arguement is True, otherwise an open connection is closed
        with the device. Calling this method multiple times with the same value
        has no effect.

        Note that when the ioHub EyeLink Device class is created when the ioHub server starts,
        a connection is automatically created with the eye tracking device.

        If the eye tracker is currently recording eye data and sending it to the
        ioHub server, the recording will be stopped prior to closing the connection.

        Args:
            enable (bool): True = enable the connection, False = disable the connection.

        Return:
            bool: indicates the current connection state to the eye tracking hardware.

        """
        try:
            tracker_config = self.getConfiguration()
            dummyModeEnabled = tracker_config.get(
                'enable_interface_without_connection', False)
            host_pc_ip_address = tracker_config.get(
                'network_settings', '100.1.1.1')

            if EyeTracker._eyelink is None:
                if dummyModeEnabled:
                    EyeTracker._eyelink = pylink.EyeLink(None)
                else:
                    EyeTracker._eyelink = pylink.EyeLink(host_pc_ip_address)
                self._eyelink.setOfflineMode()
                return EyeTrackerConstants.EYETRACKER_OK

            if enable is True or enable is False:
                if enable is True and not self._eyelink.isConnected():
                    if dummyModeEnabled:
                        self._eyelink.dummy_open()
                    else:
                        self._eyelink.open(host_pc_ip_address)

                        pylink.flushGetkeyQueue()
                        self._eyelink.setOfflineMode()
                    return EyeTrackerConstants.EYETRACKER_OK
                elif enable is False and self._eyelink.isConnected():
                    self._eyelink.setOfflineMode()

                    if self._active_edf_file:
                        self._eyelink.closeDataFile()
                        # receive(scr,dest)
                        self._eyelink.receiveDataFile(
                            self._host_edf_name + '.EDF',
                            os.path.join(
                                self._local_edf_dir,
                                self._active_edf_file))
                    self._eyelink.close()
                    EyeTracker._active_edf_file = None
                    return EyeTrackerConstants.EYETRACKER_OK
            else:
                print2err('INVALID_METHOD_ARGUMENT_VALUE')
        except Exception as e:
            printExceptionDetailsToStdErr()

    def isConnected(self):
        """isConnected indicates if there is an active connection between the
        ioHub Server and the eye tracking device.

        Note that when the ioHub EyeLink Device class is created when the ioHub server starts,
        a connection is automatically created with the eye tracking device.

        The ioHub must be connected to the eye tracker device for it to be able to receive
        events from the eye tracking system. Eye tracking events are received when
        isConnected() == True and when isRecordingEnabled() == True.

        Args:
            None

        Return:
            bool:  True = the eye tracking hardware is connected. False otherwise.

        """
        try:
            return self._eyelink.isConnected() != 0
        except Exception as e:
            printExceptionDetailsToStdErr()

    def sendCommand(self, key, value=None):
        """The sendCommand method sends an EyeLink command key and value to the
        EyeLink device. Any valid EyeLInk command can be sent using this
        method. However, not that doing so is a device dependent operation, and
        will have no effect on other implementations of the Common EyeTracker
        Interface, unless the other eye tracking device happens to support the
        same command, value format.

        If both key and value are provided, internally they are combined into a
        string of the form:

            "key = value"

        and this is sent to the EyeLink device. If only key is provided, it is
        assumed to include both the command name and any value or arguements
        required by the EyeLink all in the one arguement, which is sent to the
        EyeLink device untouched.

        """
        try:
            if key in EyeTracker._COMMAND_TO_FUNCTION:
                return EyeTracker._COMMAND_TO_FUNCTION[key](*value)
            else:
                cmdstr = ''
                if value is None:
                    cmdstr = '{0}'.format(key)
                else:
                    cmdstr = '{0} = {1}'.format(key, value)
                self._eyelink.sendCommand(cmdstr)
                r = self._readResultFromTracker(cmdstr)
                print2err('[%s] result: %s' % (cmdstr, r))
                return EyeTrackerConstants.EYETRACKER_OK
        except Exception as e:
            printExceptionDetailsToStdErr()

    def sendMessage(self, message_contents, time_offset=None):
        """The sendMessage method sends a string (max length 128 characters) to
        the EyeLink device.

        The message will be time stamped and inserted into the
        native EDF file, if one is being recorded. If no native EyeLink data file
        is being recorded, this method is a no-op.

        """
        try:
            if time_offset:
                r = self._eyelink.sendMessage(
                    '\t%d\t%s' %
                    (time_offset, message_contents))
            else:
                r = self._eyelink.sendMessage(message_contents)

            if r == 0:
                return EyeTrackerConstants.EYETRACKER_OK
            return EyeTrackerConstants.EYETRACKER_ERROR
        except Exception as e:
            printExceptionDetailsToStdErr()

    def runSetupProcedure(self):
        """Start the EyeLink Camera Setup and Calibration procedure.

        During the system setup, the following keys can be used on either the
        Host PC or Experiment PC to control the state of the setup procedure:

            * C = Start Calibration
            * V = Start Validation
            * ENTER should be pressed at the end of a calibration or validation to accept the calibration, or in the case of validation, use the option drift correction that can be performed as part of the validation process in the EyeLink system.
            * ESC can be pressed at any time to exit the current state of the setup procedure and return to the initial blank screen state.
            * O = Exit the runSetupProcedure method and continue with the experiment.
        """
        if starting_state != EyeTrackerConstants.DEFAULT_SETUP_PROCEDURE:
            printExceptionDetailsToStdErr()

        try:
            from . import eyeLinkCoreGraphicsIOHubPsychopy
            EyeLinkCoreGraphicsIOHubPsychopy = eyeLinkCoreGraphicsIOHubPsychopy.EyeLinkCoreGraphicsIOHubPsychopy

            calibration_properties = self.getConfiguration().get('calibration')
            circle_attributes = calibration_properties.get('target_attributes')
            targetForegroundColor = circle_attributes.get(
                'outer_color')  # [r,g,b] of outer circle of targets
            targetBackgroundColor = circle_attributes.get(
                'inner_color')  # [r,g,b] of inner circle of targets
            screenColor = calibration_properties.get(
                'screen_background_color')                     # [r,g,b] of screen
            # diameter of outer target circle (in px)
            targetOuterDiameter = circle_attributes.get('outer_diameter')
            # diameter of inner target circle (in px)
            targetInnerDiameter = circle_attributes.get('inner_diameter')

            genv = EyeLinkCoreGraphicsIOHubPsychopy(
                self,
                targetForegroundColor=targetForegroundColor,
                targetBackgroundColor=targetBackgroundColor,
                screenColor=screenColor,
                targetOuterDiameter=targetOuterDiameter,
                targetInnerDiameter=targetInnerDiameter)

            pylink.openGraphicsEx(genv)
            self._eyelink.doTrackerSetup()
            genv._unregisterEventMonitors()
            genv.clearAllEventBuffers()
            genv.window.close()

            return EyeTrackerConstants.EYETRACKER_OK

        except Exception as e:
            printExceptionDetailsToStdErr()
            return EyeTrackerConstants.EYETRACKER_ERROR

    def isRecordingEnabled(self):
        """isRecordingEnabled returns True if the eye tracking device is
        currently connected and sending eye event data to the ioHub server. If
        the eye tracker is not recording, or is not connected to the ioHub
        server, False will be returned.

        Args:
           None

        Return:
            bool: True == the device is recording data; False == Recording is not occurring

        """
        try:
            return self._eyelink.isRecording() == 0
        except Exception as e:
            printExceptionDetailsToStdErr()

    def enableEventReporting(self, enabled=True):
        """enableEventReporting is the device type independent method that is
        equivalent to the EyeTracker specific setRecordingState method."""
        try:
            enabled = EyeTrackerDevice.enableEventReporting(self, enabled)
            return self.setRecordingState(enabled)
        except Exception as e:
            printExceptionDetailsToStdErr()

    def setRecordingState(self, recording):
        """
        setRecordingState enables (recording=True) or disables (recording=False)
        the recording of eye data by the eye tracker and the sending of any eye
        data to the ioHub Server. The eye tracker must be connected to the ioHub Server
        by using the setConnectionState(True) method for recording to be possible.

        Args:
            recording (bool): if True, the eye tracker will start recordng data.; false = stop recording data.

        Return:
            bool: the current recording state of the eye tracking device
        """
        try:
            if not isinstance(recording, bool):
                printExceptionDetailsToStdErr()

            if recording is True and not self.isRecordingEnabled():
                error = self._eyelink.startRecording(1, 1, 1, 1)
                if error:
                    print2err('Start Recording error : ', error)

                if not self._eyelink.waitForBlockStart(100, 1, 0):
                    print2err('EYETRACKER_START_RECORD_EXCEPTION ')

                EyeTrackerDevice.enableEventReporting(self, True)
                return self.isRecordingEnabled()

            elif recording is False and self.isRecordingEnabled():
                self._eyelink.stopRecording()
                EyeTrackerDevice.enableEventReporting(self, False)

                self._latest_sample = None
                self._latest_gaze_position = None
                return self.isRecordingEnabled()
        except Exception as e:
            printExceptionDetailsToStdErr()

    def getLastSample(self):
        """getLastSample returns the most recent EyeSampleEvent received from
        the EyeLink system. Any position fields are in Display device coordinate
        space. If the eye tracker is not recording or is not connected, then
        None is returned.

        Args:
            None

        Returns:
            None: If the eye tracker is not currently recording data.

            EyeSample: If the eye tracker is recording in a monocular tracking mode, the latest sample event of this event type is returned.

            BinocularEyeSample:  If the eye tracker is recording in a binocular tracking mode, the latest sample event of this event type is returned.

        """
        try:
            return self._latest_sample
        except Exception as e:
            printExceptionDetailsToStdErr()

    def getLastGazePosition(self):
        """getLastGazePosition returns the most recent x,y eye position, in
        Display device coordinate space, received by the ioHub server from the
        EyeLink device. In the case of binocular recording, and if both eyes
        are successfully being tracked, then the average of the two eye
        positions is returned. If the eye tracker is not recording or is not
        connected, then None is returned. The getLastGazePosition method
        returns the most recent eye gaze position retieved from the eye tracker
        device. This is the position on the calibrated 2D surface that the eye
        tracker is reporting as the current eye position. The units are in the
        units in use by the Display device.

        If binocular recording is being performed, the average position of both
        eyes is returned.

        If no samples have been received from the eye tracker, or the
        eye tracker is not currently recording data, None is returned.

        Args:
            None

        Returns:
            None: If the eye tracker is not currently recording data or no eye samples have been received.

            tuple: Latest (gaze_x,gaze_y) position of the eye(s)

        """
        try:
            return self._latest_gaze_position
        except Exception as e:
            printExceptionDetailsToStdErr()

    def _poll(self):
        try:
            if self._eyelink is None:
                return
            eyelink = self._eyelink
            DEVICE_TIMEBASE_TO_SEC = EyeTracker.DEVICE_TIMEBASE_TO_SEC
            poll_time = Computer.getTime()
            confidenceInterval = poll_time - self._last_poll_time
            self._last_poll_time = poll_time

            # get native events queued up
            nEvents = []
            while True:
                ne = eyelink.getNextData()
                if ne == 0 or ne is None:
                    break  # no more events / samples to process

                ne = eyelink.getFloatData()
                if ne is None:
                    break

                cltime = Computer.getTime()
                cttime = self.trackerSec()

                event_timestamp = ne.getTime() * DEVICE_TIMEBASE_TO_SEC
                event_delay = cttime - event_timestamp
                if event_delay < 0:
                    event_delay = 0.0

                timestamp = cltime - event_delay

                ne.logged_time = cltime
                ne.event_timestamp = event_timestamp
                ne.timestamp = timestamp
                ne.event_delay = event_delay
                nEvents.append(ne)

            for ne in nEvents:
                if isinstance(ne, pylink.Sample):
                    # now convert from native format to pyEyeTracker  common
                    # format

                    ppd = ne.getPPD()

                    # hubtime calculation needs to be finished / improved.
                    # - offset should be an integration of 1% to handle noise / spikes in
                    #   calculation
                    # - need to handle drift between clocks

                    if ne.isBinocular():
                        # binocular sample
                        status = 0
                        lastgaze = None
                        event_type = EventConstants.BINOCULAR_EYE_SAMPLE
                        myeye = EyeTrackerConstants.BINOCULAR
                        leftData = ne.getLeftEye()
                        rightData = ne.getRightEye()

                        leftPupilSize = leftData.getPupilSize()
                        leftRawPupil = leftData.getRawPupil()
                        if leftRawPupil[0] == pylink.MISSING_DATA:
                            leftRawPupil = (0.0, 0.0)

                        leftHref = leftData.getHREF()
                        if leftHref[0] == pylink.MISSING_DATA:
                            leftHref = (0.0, 0.0)

                        leftGaze = EyeTrackerConstants.UNDEFINED, EyeTrackerConstants.UNDEFINED
                        gx, gy = leftData.getGaze()
                        if gx == pylink.MISSING_DATA or gy == pylink.MISSING_DATA or leftPupilSize == 0:
                            status = 20
                            leftPupilSize = 0
                        else:
                            leftGaze = self._eyeTrackerToDisplayCoords(
                                (gx, gy))
                            lastgaze = leftGaze
                            
                        rightPupilSize = rightData.getPupilSize()
                        rightRawPupil = rightData.getRawPupil()
                        rightHref = rightData.getHREF()
                        if rightHref[0] == pylink.MISSING_DATA:
                            rightHref = (0.0, 0.0)  # [0]=0
                        if rightRawPupil[0] == pylink.MISSING_DATA:
                            rightRawPupil = (0.0, 0.0)
                        rightGaze = EyeTrackerConstants.UNDEFINED, EyeTrackerConstants.UNDEFINED
                        gx, gy = rightData.getGaze()
                        if gx == pylink.MISSING_DATA or gy == pylink.MISSING_DATA or rightPupilSize == 0:
                            status += 2
                            rightPupilSize = 0
                        else:
                            rightGaze = self._eyeTrackerToDisplayCoords(
                                (gx, gy))

                            if lastgaze is None:
                                lastgaze = rightGaze
                            else:
                                lastgaze = [lastgaze[0]+rightGaze[0], lastgaze[1]+rightGaze[1]]
                                lastgaze = lastgaze[0]/2.0, lastgaze[1]/2.0
                                 
                        self._latest_gaze_position=lastgaze

                        # TO DO: EyeLink pyLink does not expose sample velocity
                        # fields. Patch and fix.
                        vel_x = 0
                        vel_y = 0
                        vel_xy = 0

                        binocSample = [
                            0,
                            0,
                            0,  # device id (not currently used)
                            Device._getNextEventID(),
                            event_type,
                            ne.event_timestamp,
                            ne.logged_time,
                            ne.timestamp,
                            confidenceInterval,
                            ne.event_delay,
                            0,
                            leftGaze[0],
                            leftGaze[1],
                            EyeTrackerConstants.UNDEFINED,
                            EyeTrackerConstants.UNDEFINED,
                            EyeTrackerConstants.UNDEFINED,
                            EyeTrackerConstants.UNDEFINED,
                            leftHref[0],
                            leftHref[1],
                            leftRawPupil[0],
                            leftRawPupil[1],
                            leftPupilSize,
                            EyeTrackerConstants.PUPIL_AREA,
                            EyeTrackerConstants.UNDEFINED,
                            EyeTrackerConstants.UNDEFINED,
                            ppd[0],
                            ppd[1],
                            vel_x,
                            vel_y,
                            vel_xy,
                            rightGaze[0],
                            rightGaze[1],
                            EyeTrackerConstants.UNDEFINED,
                            EyeTrackerConstants.UNDEFINED,
                            EyeTrackerConstants.UNDEFINED,
                            EyeTrackerConstants.UNDEFINED,
                            rightHref[0],
                            rightHref[1],
                            rightRawPupil[0],
                            rightRawPupil[1],
                            rightPupilSize,
                            EyeTrackerConstants.PUPIL_AREA,
                            EyeTrackerConstants.UNDEFINED,
                            EyeTrackerConstants.UNDEFINED,
                            ppd[0],
                            ppd[1],
                            vel_x,
                            vel_y,
                            vel_xy,
                            status
                        ]

                        self._latest_sample = binocSample

                        self._addNativeEventToBuffer(binocSample)

                    else:
                        # monocular sample
                        event_type = EventConstants.MONOCULAR_EYE_SAMPLE
                        leftEye = ne.isLeftSample()
                        eyeData = None
                        if leftEye == 1:
                            eyeData = ne.getLeftEye()
                            myeye = EyeTrackerConstants.LEFT_EYE
                        else:
                            eyeData = ne.getRightEye()
                            myeye = EyeTrackerConstants.RIGHT_EYE

                        pupilSize = eyeData.getPupilSize()
                        rawPupil = eyeData.getRawPupil()
                        if rawPupil[0] == pylink.MISSING_DATA:
                            rawPupil = (0.0, 0.0)

                        href = eyeData.getHREF()
                        if href[0] == pylink.MISSING_DATA:
                            href = (0.0, 0.0)

                        gx, gy = eyeData.getGaze()
                        status = 0
                        if gx == pylink.MISSING_DATA or gy == pylink.MISSING_DATA or pupilSize == 0:
                            gaze = EyeTrackerConstants.UNDEFINED, EyeTrackerConstants.UNDEFINED
                            status = 2
                            self._latest_gaze_position = None
                        else:
                            gaze = self._eyeTrackerToDisplayCoords((gx, gy))
                            self._latest_gaze_position = (gaze[0], gaze[1])

                        # TO DO: EyeLink pyLink does not expose sample velocity
                        # fields. Patch and fix.
                        vel_x = 0
                        vel_y = 0
                        vel_xy = 0

                        monoSample = [0,
                                      0,
                                      0,  # device id (not currently used)
                                      Device._getNextEventID(),
                                      event_type,
                                      ne.event_timestamp,
                                      ne.logged_time,
                                      ne.timestamp,
                                      confidenceInterval,
                                      ne.event_delay,
                                      0,
                                      myeye,
                                      gaze[0],
                                      gaze[1],
                                      EyeTrackerConstants.UNDEFINED,
                                      EyeTrackerConstants.UNDEFINED,
                                      EyeTrackerConstants.UNDEFINED,
                                      EyeTrackerConstants.UNDEFINED,
                                      href[0],
                                      href[1],
                                      rawPupil[0],
                                      rawPupil[1],
                                      pupilSize,
                                      EyeTrackerConstants.PUPIL_AREA,
                                      EyeTrackerConstants.UNDEFINED,
                                      EyeTrackerConstants.UNDEFINED,
                                      ppd[0],
                                      ppd[1],
                                      vel_x,
                                      vel_y,
                                      vel_xy,
                                      status
                                      ]
                       # EyeTracker._eventArrayLengths['MONOC_EYE_SAMPLE']=len(monoSample)
                        self._latest_sample = monoSample
                        self._addNativeEventToBuffer(monoSample)

                elif isinstance(ne, pylink.EndFixationEvent):
                    etype = EventConstants.FIXATION_END

                    estatus = ne.getStatus()

                    which_eye = ne.getEye()
                    if which_eye:
                        which_eye = EyeTrackerConstants.RIGHT_EYE
                    else:
                        which_eye = EyeTrackerConstants.LEFT_EYE

                    start_event_time = ne.getStartTime() * DEVICE_TIMEBASE_TO_SEC
                    end_event_time = ne.event_timestamp
                    event_duration = end_event_time - start_event_time

                    s_gaze = self._eyeTrackerToDisplayCoords(ne.getStartGaze())
                    s_href = ne.getStartHREF()
                    s_vel = ne.getStartVelocity()
                    s_pupilsize = ne.getStartPupilSize()
                    s_ppd = ne.getStartPPD()

                    e_gaze = self._eyeTrackerToDisplayCoords(ne.getEndGaze())
                    e_href = ne.getEndHREF()
                    e_pupilsize = ne.getEndPupilSize()
                    e_vel = ne.getEndVelocity()
                    e_ppd = ne.getEndPPD()

                    a_gaze = self._eyeTrackerToDisplayCoords(
                        ne.getAverageGaze())
                    a_href = ne.getAverageHREF()
                    a_pupilsize = ne.getAveragePupilSize()
                    a_vel = ne.getAverageVelocity()

                    peak_vel = ne.getPeakVelocity()

                    fee = [0,
                           0,
                           0,  # device id (not currently used)
                           Device._getNextEventID(),
                           etype,
                           ne.event_timestamp,
                           ne.logged_time,
                           ne.timestamp,
                           confidenceInterval,
                           ne.event_delay,
                           0,
                           which_eye,
                           event_duration,
                           s_gaze[0],
                           s_gaze[1],
                           EyeTrackerConstants.UNDEFINED,
                           s_href[0],
                           s_href[1],
                           EyeTrackerConstants.UNDEFINED,
                           EyeTrackerConstants.UNDEFINED,
                           s_pupilsize,
                           EyeTrackerConstants.PUPIL_AREA,
                           EyeTrackerConstants.UNDEFINED,
                           EyeTrackerConstants.UNDEFINED,
                           s_ppd[0],
                           s_ppd[1],
                           EyeTrackerConstants.UNDEFINED,
                           EyeTrackerConstants.UNDEFINED,
                           s_vel,
                           e_gaze[0],
                           e_gaze[1],
                           EyeTrackerConstants.UNDEFINED,
                           e_href[0],
                           e_href[1],
                           EyeTrackerConstants.UNDEFINED,
                           EyeTrackerConstants.UNDEFINED,
                           e_pupilsize,
                           EyeTrackerConstants.PUPIL_AREA,
                           EyeTrackerConstants.UNDEFINED,
                           EyeTrackerConstants.UNDEFINED,
                           e_ppd[0],
                           e_ppd[1],
                           EyeTrackerConstants.UNDEFINED,
                           EyeTrackerConstants.UNDEFINED,
                           e_vel,
                           a_gaze[0],
                           a_gaze[1],
                           EyeTrackerConstants.UNDEFINED,
                           a_href[0],
                           a_href[1],
                           EyeTrackerConstants.UNDEFINED,
                           EyeTrackerConstants.UNDEFINED,
                           a_pupilsize,
                           EyeTrackerConstants.PUPIL_AREA,
                           EyeTrackerConstants.UNDEFINED,
                           EyeTrackerConstants.UNDEFINED,
                           EyeTrackerConstants.UNDEFINED,
                           EyeTrackerConstants.UNDEFINED,
                           EyeTrackerConstants.UNDEFINED,
                           EyeTrackerConstants.UNDEFINED,
                           a_vel,
                           EyeTrackerConstants.UNDEFINED,
                           EyeTrackerConstants.UNDEFINED,
                           peak_vel,
                           estatus
                           ]
                    # EyeTracker._eventArrayLengths['FIXATION_END']=len(fee)
                    self._addNativeEventToBuffer(fee)

                elif isinstance(ne, pylink.EndSaccadeEvent):
                    etype = EventConstants.SACCADE_END

                    estatus = ne.getStatus()

                    which_eye = ne.getEye()
                    if which_eye:
                        which_eye = EyeTrackerConstants.RIGHT_EYE
                    else:
                        which_eye = EyeTrackerConstants.LEFT_EYE

                    start_event_time = ne.getStartTime() * DEVICE_TIMEBASE_TO_SEC
                    end_event_time = ne.event_timestamp
                    event_duration = end_event_time - start_event_time

                    e_amp = ne.getAmplitude()
                    e_angle = ne.getAngle()

                    s_gaze = self._eyeTrackerToDisplayCoords(ne.getStartGaze())
                    s_href = ne.getStartHREF()
                    s_vel = ne.getStartVelocity()
                    s_pupilsize = -1.0
                    s_ppd = ne.getStartPPD()

                    e_gaze = self._eyeTrackerToDisplayCoords(ne.getEndGaze())
                    e_href = ne.getEndHREF()
                    e_pupilsize = -1.0
                    e_vel = ne.getEndVelocity()
                    e_ppd = ne.getEndPPD()

                    a_vel = ne.getAverageVelocity()
                    peak_vel = ne.getPeakVelocity()

                    see = [0,
                           0,
                           0,  # device id (not currently used)
                           Device._getNextEventID(),
                           etype,
                           ne.event_timestamp,
                           ne.logged_time,
                           ne.timestamp,
                           confidenceInterval,
                           ne.event_delay,
                           0,
                           which_eye,
                           event_duration,
                           e_amp[0],
                           e_amp[1],
                           e_angle,
                           s_gaze[0],
                           s_gaze[1],
                           EyeTrackerConstants.UNDEFINED,
                           s_href[0],
                           s_href[1],
                           EyeTrackerConstants.UNDEFINED,
                           EyeTrackerConstants.UNDEFINED,
                           s_pupilsize,
                           EyeTrackerConstants.PUPIL_AREA,
                           EyeTrackerConstants.UNDEFINED,
                           EyeTrackerConstants.UNDEFINED,
                           s_ppd[0],
                           s_ppd[1],
                           EyeTrackerConstants.UNDEFINED,
                           EyeTrackerConstants.UNDEFINED,
                           s_vel,
                           e_gaze[0],
                           e_gaze[1],
                           EyeTrackerConstants.UNDEFINED,
                           e_href[0],
                           e_href[1],
                           EyeTrackerConstants.UNDEFINED,
                           EyeTrackerConstants.UNDEFINED,
                           e_pupilsize,
                           EyeTrackerConstants.PUPIL_AREA,
                           EyeTrackerConstants.UNDEFINED,
                           EyeTrackerConstants.UNDEFINED,
                           e_ppd[0],
                           e_ppd[1],
                           EyeTrackerConstants.UNDEFINED,
                           EyeTrackerConstants.UNDEFINED,
                           e_vel,
                           EyeTrackerConstants.UNDEFINED,
                           EyeTrackerConstants.UNDEFINED,
                           a_vel,
                           EyeTrackerConstants.UNDEFINED,
                           EyeTrackerConstants.UNDEFINED,
                           peak_vel,
                           estatus
                           ]
                    self._addNativeEventToBuffer(see)
                elif isinstance(ne, pylink.EndBlinkEvent):
                    etype = EventConstants.BLINK_END

                    estatus = ne.getStatus()

                    which_eye = ne.getEye()
                    if which_eye:
                        which_eye = EyeTrackerConstants.RIGHT_EYE
                    else:
                        which_eye = EyeTrackerConstants.LEFT_EYE

                    start_event_time = ne.getStartTime() * DEVICE_TIMEBASE_TO_SEC
                    end_event_time = ne.event_timestamp
                    event_duration = end_event_time - start_event_time

                    bee = [
                        0,
                        0,
                        0,
                        Device._getNextEventID(),
                        etype,
                        ne.event_timestamp,
                        ne.logged_time,
                        ne.timestamp,
                        confidenceInterval,
                        ne.event_delay,
                        0,
                        which_eye,
                        event_duration,
                        estatus
                    ]

                    self._addNativeEventToBuffer(bee)

                elif isinstance(ne, pylink.StartFixationEvent) or isinstance(ne, pylink.StartSaccadeEvent):
                    etype = EventConstants.FIXATION_START

                    if isinstance(ne, pylink.StartSaccadeEvent):
                        etype = EventConstants.SACCADE_START

                    which_eye = ne.getEye()
                    if which_eye:
                        which_eye = EyeTrackerConstants.RIGHT_EYE
                    else:
                        which_eye = EyeTrackerConstants.LEFT_EYE

                    pupil_size = -1
                    if etype == EventConstants.FIXATION_START:
                        pupil_size = ne.getStartPupilSize()
                    gaze = self._eyeTrackerToDisplayCoords(ne.getStartGaze())
                    href = ne.getStartHREF()
                    velocity = ne.getStartVelocity()
                    ppd = ne.getStartPPD()
                    estatus = ne.getStatus()

                    se = [
                        0,                                      # exp ID
                        0,                                      # sess ID
                        0,  # device id (not currently used)
                        Device._getNextEventID(),              # event ID
                        etype,                                  # event type
                        ne.event_timestamp,
                        ne.logged_time,
                        ne.timestamp,
                        confidenceInterval,
                        ne.event_delay,
                        0,
                        which_eye,                              # eye
                        gaze[0],                                # gaze x
                        gaze[1],                                # gaze y
                        EyeTrackerConstants.UNDEFINED,                                     # gaze z
                        href[0],                                # angle x
                        href[1],                                # angle y
                        EyeTrackerConstants.UNDEFINED,                                   # raw x
                        EyeTrackerConstants.UNDEFINED,                                   # raw y
                        pupil_size,                             # pupil area
                        EyeTrackerConstants.PUPIL_AREA,                    # pupil measure type 1
                        EyeTrackerConstants.UNDEFINED,
                        # pupil measure 2
                        EyeTrackerConstants.UNDEFINED,     # pupil measure 2 type
                        ppd[0],                                 # ppd x
                        ppd[1],                                 # ppd y
                        EyeTrackerConstants.UNDEFINED,                                    # velocity x
                        EyeTrackerConstants.UNDEFINED,                                    # velocity y
                        velocity,                                # velocity xy
                        estatus                                  # status
                    ]

                    self._addNativeEventToBuffer(se)

                elif isinstance(ne, pylink.StartBlinkEvent):
                    etype = EventConstants.BLINK_START

                    estatus = ne.getStatus()

                    which_eye = ne.getEye()
                    if which_eye:
                        which_eye = EyeTrackerConstants.RIGHT_EYE
                    else:
                        which_eye = EyeTrackerConstants.LEFT_EYE

                    bse = [
                        0,
                        0,
                        0,  # device id (not currently used)
                        Device._getNextEventID(),
                        etype,
                        ne.event_timestamp,
                        ne.logged_time,
                        ne.timestamp,
                        confidenceInterval,
                        ne.event_delay,
                        0,
                        which_eye,
                        estatus
                    ]

                    self._addNativeEventToBuffer(bse)

        except Exception:
            print2err('ERROR occurred during poll:')
            printExceptionDetailsToStdErr()

    def _eyeTrackerToDisplayCoords(self, eyetracker_point):
        """"""
        try:
            cl, ct, cr, cb = self._display_device.getCoordBounds()
            cw, ch = cr - cl, ct - cb

            dl, dt, dr, db = self._display_device.getBounds()
            dw, dh = dr - dl, db - dt

            gxn, gyn = eyetracker_point[0] / dw, eyetracker_point[1] / dh
            return cl + cw * gxn, cb + ch * (1.0 - gyn)
        except Exception as e:
            printExceptionDetailsToStdErr()

    def _displayToEyeTrackerCoords(self, display_x, display_y):
        """"""
        try:
            cl, ct, cr, cb = self._display_device.getCoordBounds()
            cw, ch = cr - cl, ct - cb

            dl, dt, dr, db = self._display_device.getBounds()
            dw, dh = dr - dl, db - dt

            cxn, cyn = (display_x + cw / 2) / cw, 1.0 - \
                (display_y - ch / 2) / ch
            return cxn * dw, cyn * dh

        except Exception as e:
            printExceptionDetailsToStdErr()

    def _setRuntimeSettings(self, runtimeSettings):
        for pkey, v in runtimeSettings.items():
            if pkey == 'sample_filtering':
                all_filters={'FILTER_FILE': 'FILTER_LEVEL_2',
                             'FILTER_ONLINE': 'FILTER_LEVEL_OFF'}
                if str(v) in ('FILTER_OFF','FILTER_LEVEL_OFF','FILTER_LEVEL_1','FILTER_LEVEL_2'):
                    vd = {u'FILTER_ALL': str(v)}
                    v = vd

                fkeys = [str(k) for k in v]
                if 'FILTER_ALL' in fkeys:
                    for k in all_filters:
                        all_filters[k] = str(v[u'FILTER_ALL'])
                else:
                    for k in fkeys:
                        if k in all_filters:
                            all_filters[k]=str(v[k])
                self._setSampleFilterLevel(all_filters)
            elif pkey == 'sampling_rate':
                self._setSamplingRate(v)
            elif pkey == 'track_eyes':
                self._setEyesToTrack(v)
            elif pkey == 'vog_settings':
                for vog_key, vog_val in v.items():
                    if vog_key == 'pupil_measure_types':
                        self._eyelink.sendCommand(
                            'pupil_size_diameter = %s' %
                            (vog_val.split('_')[1]))
                    elif vog_key == 'pupil_center_algorithm':
                        self._setPupilDetection(vog_val)
                    elif vog_key == 'tracking_mode':
                        self._setEyeTrackingMode(vog_val)
                    else:
                        print2err(
                            'WARNING: unhandled eye tracker config setting ( in sub group vog_settings):',
                            vog_key,
                            vog_val)
                        print2err('')
            else:
                print2err(
                    'WARNING: unhandled eye tracker config setting:', pkey, v)

    def _fileTransferProgressUpdate(self, size, received):
        if ProgressBarDialog is None:
            #print2err("eyelink._fileTransferProgressUpdate() not asupported: wx package not found")
            return
            
        if EyeTracker._file_transfer_progress_dialog is None:
            EyeTracker._file_transfer_progress_dialog = ProgressBarDialog(
                'ioHub EyeLink(C) Interface',
                'Transferring  ' + self._full_edf_name + '.EDF to ' + self._local_edf_dir,
                100, display_index=self._display_device.getIndex())
        elif received >= size and EyeTracker._file_transfer_progress_dialog:
            EyeTracker._file_transfer_progress_dialog.close()
            EyeTracker._file_transfer_progress_dialog = None
        else:
            perc = int((float(received) / float(size)) * 100.0) + 1
            if perc > 100:
                perc = 100
            if perc != self._file_transfer_progress_dialog.getCurrentStatus():
                self._file_transfer_progress_dialog.updateStatus(perc)

    def _setEyesToTrack(self, track_eyes):
        """"""
        try:
            if isinstance(track_eyes, basestring):
                pass
            else:
                track_eyes = EyeTrackerConstants.getName(track_eyes)

            if track_eyes is None:
                print2err(
                    '** Warning: UNKNOWN EYE CONSTANT, SETTING EYE TO TRACK TO RIGHT. UNKNOWN EYE CONSTANT: ',
                    track_eyes)
                track_eyes = 'RIGHT'
            if track_eyes in [
                'RIGHT', EyeTrackerConstants.getName(
                    EyeTrackerConstants.RIGHT_EYE)]:
                track_eyes = 'RIGHT'
            elif track_eyes in ['LEFT', EyeTrackerConstants.getName(EyeTrackerConstants.LEFT_EYE)]:
                track_eyes = 'LEFT'
            elif track_eyes in ['BOTH', EyeTrackerConstants.getName(EyeTrackerConstants.BINOCULAR)]:
                track_eyes = 'BOTH'
            else:
                print2err(
                    '** Warning: UNKNOWN EYE CONSTANT, SETTING EYE TO TRACK TO RIGHT. UNKNOWN EYE CONSTANT: ',
                    track_eyes)
                track_eyes = 'RIGHT'

            srate = self._getSamplingRate()

            self._eyelink.sendCommand('lock_active_eye = NO')
            if track_eyes == 'BOTH':
                if self._eyelink.getTrackerVersion() == 3:
                    if srate >= 1000:
                        print2err(
                            'ERROR: setEyesToTrack: EyeLink can not record binocularly over 500 hz.')
                        return EyeTrackerConstants.EYETRACKER_ERROR
                    else:
                        trackerVersion = self._eyelink.getTrackerVersionString().strip()
                        trackerVersion = trackerVersion.split(' ')
                        tv = float(trackerVersion[len(trackerVersion) - 1])
                        if tv <= 3:
                            if srate > 500:
                                print2err(
                                    'ERROR: setEyesToTrack: Selected sample rate is not supported in binocular mode')
                                return EyeTrackerConstants.EYETRACKER_ERROR
                            else:
                                self._eyelink.sendCommand(
                                    'binocular_enabled = YES')
                                return EyeTrackerConstants.EYETRACKER_OK
                        else:
                            rts = []
                            modes = self._readResultFromTracker(
                                'read_mode_list')
                            if modes is None or modes.strip() == 'Unknown Variable Name':
                                print2err(
                                    'ERROR: setEyesToTrack: Failed to get supported modes. ')
                                return EyeTrackerConstants.EYETRACKER_ERROR
                            modes = modes.strip().split()
                            #print2err('EL Modes: ', modes)
                            for x in modes:
                                if x[-1] == 'B':
                                    x = int(x.replace('B', ' ').strip())
                                    rts.append(x)
                            #print2err('EL srate: ', srate)
                            #print2err('EL rts: ', rts)
                            if srate in rts:
                                self._eyelink.sendCommand(
                                    'binocular_enabled = YES')
                                return True
                            else:
                                print2err(
                                    'ERROR: setEyesToTrack: Selected sample rate is not supported!')
                                return EyeTrackerConstants.EYETRACKER_ERROR
            else:
                self._eyelink.sendCommand('binocular_enabled = NO')
                self._eyelink.sendCommand('current_camera = %s' % (track_eyes))
                self._eyelink.sendCommand('active_eye = %s' % (track_eyes))
                self._eyelink.sendCommand('lock_active_eye = YES')
                return EyeTrackerConstants.EYETRACKER_OK
        except Exception:
            print2err('EYELINK Error during _setEyesToTrack:')
            printExceptionDetailsToStdErr()
            return EyeTrackerConstants.EYETRACKER_ERROR

    def _setSamplingRate(self, sampling_rate):
        """"""
        try:
            if self.isConnected():
                srate = sampling_rate
                tracker_version = self._eyelink.getTrackerVersion()
                if tracker_version < 3:
                    # eyelink II
                    self._eyelink.sendCommand(
                        'use_high_speed %d' %
                        (srate == 500))
                else:
                    trackerVersion = self._eyelink.getTrackerVersionString().strip()
                    trackerVersion = trackerVersion.split(' ')
                    tv = float(trackerVersion[len(trackerVersion) - 1])

                    if tv > 3:
                        # EyeLink 2000
                        rts = []
                        modes = self._readResultFromTracker('read_mode_list')
                        if modes is None or modes.strip() == 'Unknown Variable Name':
                            print2err(
                                'IOHUB_DEVICE_EXCEPTION.Error: Could not retrieve sample rate modes from EyeLink Host.',
                                ' EyeTracker.setSamplingRate ',
                                str(modes))
                        else:
                            modes = modes.strip().split()

                            #ioHub.print2err("Modes = ", modes)
                            for x in modes:
                                m = x.replace('B', ' ').strip()
                                m = m.replace('R', ' ').strip()
                                x = int(m)
                                rts.append(x)
                            if srate in rts:
                                self._eyelink.sendCommand(
                                    'sample_rate = %d' % (srate))
                    else:
                        if srate <= 1000:
                            self.sendCommand('sample_rate = %d' % (srate))
                return self._getSamplingRate()
            return EyeTrackerConstants.EYETRACKER_ERROR
        except Exception:
            print2err('EYELINK Error during _setSamplingRate:')
            printExceptionDetailsToStdErr()
            return EyeTrackerConstants.EYETRACKER_ERROR

    def _setSampleFilterLevel(self, filter_settings_dict):
        """"""
        try:
            lfilter = EyeTrackerConstants.getID(filter_settings_dict['FILTER_ONLINE'])
            ffilter = EyeTrackerConstants.getID(filter_settings_dict['FILTER_FILE'])
            if lfilter is None:
                lfilter = 0
            if ffilter is None:
                ffilter = 0
            self._eyelink.setHeuristicLinkAndFileFilter(lfilter, ffilter)
            return EyeTrackerConstants.EYETRACKER_OK
        except Exception:
            print2err('EYELINK Error during _setSampleFilterLevel: ', filter_settings_dict)
            printExceptionDetailsToStdErr()
            return EyeTrackerConstants.EYETRACKER_ERROR

    def _eyelinkSetScreenPhysicalData(self):
        try:
            eyelink = self._eyelink

            # eye to screen distance
            sdist = self._display_device.getConfiguration().get('default_eye_distance', None)
            if sdist:
                if 'surface_center' in sdist:
                    eyelink.sendCommand(
                        'screen_distance = %d ' %
                        (sdist['surface_center'],))
            else:
                print2err(
                    'ERROR: "default_eye_distance":"surface_center" value could not be read from monitor settings')
                return False

            # screen_phys_coords
            sdim = self._display_device.getConfiguration().get('physical_dimensions', None)
            if sdim:
                if 'width' in sdim and 'height' in sdim:
                    sw = sdim['width']
                    sh = sdim['height']
                    hsw = sw / 2.0
                    hsh = sh / 2.0

                    eyelink.sendCommand(
                        'screen_phys_coords = -%.3f, %.3f, %.3f, -%.3f' %
                        (hsw, hsh, hsw, hsh))
            else:
                print2err(
                    'ERROR: "physical_stimudisplay_x,display_ylus_area":"width" or "height" value could not be read from monitor settings')
                return False

            # calibration coord space
            l, t, r, b = self._display_device.getBounds()
            w = r - l
            h = b - t
            eyelink.sendCommand(
                'screen_pixel_coords %.2f %.2f %.2f %.2f' %
                (0, 0, w, h))
            eyelink.sendMessage(
                'DISPLAY_COORDS  %.2f %.2f %.2f %.2f' %
                (0, 0, w, h))

            # bug in pylink makes this not work; must use default setting of 10
            #eyelink.sendCommand("screen_write_prescale = 100")

        except Exception:
            print2err('EYELINK Error during _eyelinkSetScreenPhysicalData:')
            printExceptionDetailsToStdErr()
            return EyeTrackerConstants.EYETRACKER_ERROR

    def _eyeLinkHardwareAndSoftwareVersion(self):
        try:
            tracker_software_ver = 0
            eyelink_ver = self._eyelink.getTrackerVersion()

            if eyelink_ver == 3:
                tvstr = self._eyelink.getTrackerVersionString()
                vindex = tvstr.find('EYELINK CL')
                tracker_software_ver = int(
                    float(tvstr[(vindex + len('EYELINK CL')):].strip()))

            return eyelink_ver, tracker_software_ver
        except Exception:
            print2err('EYELINK Error during _eyeLinkHardwareAndSoftwareVersion:')
            printExceptionDetailsToStdErr()
            return EyeTrackerConstants.EYETRACKER_ERROR

    def _eyelinkSetLinkAndFileContents(self):
        try:
            eyelink = self._eyelink

            eyelink_hw_ver, eyelink_sw_ver = self._eyeLinkHardwareAndSoftwareVersion()

            # set EDF file contents
            eyelink.sendCommand(
                'file_event_filter = LEFT, RIGHT, FIXATION, SACCADE, BLINK, MESSAGE, BUTTON, INPUT')
            eyelink.sendCommand(
                'file_event_data = GAZE , GAZERES , HREF , AREA  , VELOCITY , STATUS')

            if eyelink_sw_ver >= 4:
                eyelink.sendCommand(
                    'file_sample_data = GAZE, GAZERES, HREF , PUPIL , AREA ,STATUS, BUTTON, INPUT, HTARGET')
            else:
                eyelink.sendCommand(
                    'file_sample_data = GAZE, GAZERES, HREF , PUPIL , AREA ,STATUS, BUTTON, INPUT')

            # set link data
            eyelink.sendCommand(
                'link_event_filter = LEFT, RIGHT, FIXATION, SACCADE , BLINK, BUTTON, MESSAGE, INPUT')
            eyelink.sendCommand(
                'link_event_data = GAZE, GAZERES, HREF , AREA, VELOCITY, STATUS')

            if eyelink_sw_ver >= 4:
                eyelink.sendCommand(
                    'link_sample_data = GAZE, GAZERES, HREF , PUPIL , AREA ,STATUS, BUTTON, INPUT , HTARGET')
            else:
                eyelink.sendCommand(
                    'link_sample_data = GAZE, GAZERES, HREF , PUPIL , AREA ,STATUS, BUTTON, INPUT')
        except Exception:
            print2err('EYELINK Error during _eyelinkSetLinkAndFileContents:')
            printExceptionDetailsToStdErr()
            return EyeTrackerConstants.EYETRACKER_ERROR

    def _addCommandFunctions(self):
        try:
            self._COMMAND_TO_FUNCTION['getTrackerMode'] = _getTrackerMode
            self._COMMAND_TO_FUNCTION['doDriftCorrect'] = _doDriftCorrect
            self._COMMAND_TO_FUNCTION['eyeAvailable'] = _eyeAvailable
            self._COMMAND_TO_FUNCTION['enableDummyOpen'] = _dummyOpen
            self._COMMAND_TO_FUNCTION[
                'getLastCalibrationInfo'] = _getCalibrationMessage
            self._COMMAND_TO_FUNCTION['applyDriftCorrect'] = _applyDriftCorrect
            self._COMMAND_TO_FUNCTION['setIPAddress'] = _setIPAddress
            self._COMMAND_TO_FUNCTION['setLockEye'] = _setLockEye
            self._COMMAND_TO_FUNCTION[
                'setLocalResultsDir'] = _setNativeRecordingFileSaveDir
        except Exception:
            print2err('EYELINK Error during _addCommandFunctions:')
            printExceptionDetailsToStdErr()
            return EyeTrackerConstants.EYETRACKER_ERROR

    def _readResultFromTracker(self, cmd, timeout=5):
        try:
            self._eyelink.readRequest(cmd)

            t = pylink.currentTime()
            # Waits for a maximum of timeout msec
            while(pylink.currentTime() - t < timeout):
                rv = self._eyelink.readReply()
                if rv and len(rv) > 0:
                    return rv
            return None
        except Exception:
            print2err('EYELINK Error during _readResultFromTracker:')
            printExceptionDetailsToStdErr()
            return EyeTrackerConstants.EYETRACKER_ERROR

    def _setPupilDetection(self, pmode):
        try:
            if(pmode.upper() == 'ELLIPSE_FIT'):
                self._eyelink.sendCommand('use_ellipse_fitter = YES')
            elif(pmode.upper() == 'CENTROID_FIT'):
                self._eyelink.sendCommand('force_ellipse_fitter -1')
                self._eyelink.sendCommand('use_ellipse_fitter = NO')
            else:
                print2err(
                    '** EyeLink Warning: _setPupilDetection: Unrecofnized pupil fitting type: ',
                    pmode)
                return EyeTrackerConstants.EYETRACKER_ERROR
            return EyeTrackerConstants.EYETRACKER_OK
        except Exception:
            print2err('EYELINK Error during _setPupilDetection:')
            printExceptionDetailsToStdErr()
            return EyeTrackerConstants.EYETRACKER_ERROR

    def _getPupilDetectionModel(self):
        try:
            v = self._readResultFromTracker('use_ellipse_fitter')
            if v != '0':
                return 'ELLIPSE'
            else:
                return 'CENTROID'
        except Exception:
            print2err('EYELINK Error during _getPupilDetectionModel:')
            printExceptionDetailsToStdErr()
            return EyeTrackerConstants.EYETRACKER_ERROR

    def _setEyeTrackingMode(self, r=-1):
        try:
            if r == 'PUPIL_CR_TRACKING':
                r = 1
            elif r == 'PUPIL_ONLY_TRACKING':
                r = 0
            else:
                print2err(
                    'EYELINK Error during _setEyeTrackingMode: Unknown Trackiong Mode: ', r)
                return EyeTrackerConstants.EYETRACKER_ERROR
            if r == 0:
                self._eyelink.sendCommand('force_corneal_reflection = OFF')
            self._eyelink.sendCommand('corneal_mode %d' % (r))
            return EyeTrackerConstants.EYETRACKER_OK

        except Exception:
            print2err('EYELINK Error during _setEyeTrackingMode:')
            printExceptionDetailsToStdErr()
            return EyeTrackerConstants.EYETRACKER_ERROR

    def _getSamplingRate(self):
        """"""
        try:
            if self.isConnected():
                srate = self._eyelink.getSampleRate()
                if srate is None or srate < 0:
                    srate = self._readResultFromTracker('sample_rate',5)    
                if srate:                
                    return int(srate)
            return EyeTrackerConstants.EYETRACKER_ERROR
        except Exception:
            print2err('EYELINK Error during _getSamplingRate:')
            printExceptionDetailsToStdErr()
            return EyeTrackerConstants.EYETRACKER_ERROR

#================= Command Functions ==========================================

_EYELINK_HOST_MODES = {
    'EL_IDLE_MODE': 1,
    'EL_IMAGE_MODE': 2,
    'EL_SETUP_MENU_MODE': 3,
    'EL_USER_MENU_1': 5,
    'EL_USER_MENU_2': 6,
    'EL_USER_MENU_3': 7,
    'EL_OPTIONS_MENU_MODE': 8,
    'EL_OUTPUT_MENU_MODE': 9,
    'EL_DEMO_MENU_MODE': 10,
    'EL_CALIBRATE_MODE': 11,
    'EL_VALIDATE_MODE': 12,
    'EL_DRIFT_CORR_MODE': 13,
    'EL_RECORD_MODE': 14,
}

_eyeLinkCalibrationResultDict = dict()
_eyeLinkCalibrationResultDict[-1] = 'OPERATION_FAILED'
_eyeLinkCalibrationResultDict[0] = 'OPERATION_FAILED'
_eyeLinkCalibrationResultDict[1] = 'OK_RESULT'
_eyeLinkCalibrationResultDict[27] = 'ABORTED_BY_USER'

if 1 not in _EYELINK_HOST_MODES:
    t = dict(_EYELINK_HOST_MODES)
    for k, v in t.items():
        _EYELINK_HOST_MODES[v] = k


def _getTrackerMode(*args, **kwargs):
    try:
        r = pylink.getEyeLink().getTrackerMode()
        return _EYELINK_HOST_MODES[r]
    except Exception as e:
        printExceptionDetailsToStdErr()


def _doDriftCorrect(*args, **kwargs):
    try:
        if len(args) == 4:
            x, y, draw, allow_setup = args
            r = pylink.getEyeLink().doDriftCorrect(x, y, draw, allow_setup)
            return r
        else:
            print2err('doDriftCorrect requires 4 parameters, received: ', args)
            return False
    except Exception as e:
        printExceptionDetailsToStdErr()


def _applyDriftCorrect():
    try:
        r = pylink.getEyeLink().applyDriftCorrect()
        if r == 0:
            return True
        else:
            return ['EYE_TRACKER_ERROR', 'applyDriftCorrect', r]
    except Exception as e:
        printExceptionDetailsToStdErr()


def _eyeAvailable(*args, **kwargs):
    try:
        r = pylink.getEyeLink().eyeAvailable()
        if r == 0:
            return EyeTrackerConstants.getName(EyeTrackerConstants.LEFT_EYE)
        elif r == 1:
            return EyeTrackerConstants.getName(EyeTrackerConstants.RIGHT_EYE)
        elif r == 2:
            return EyeTrackerConstants.getName(EyeTrackerConstants.BINOCULAR)
        else:
            return EyeTrackerConstants.UNDEFINED
    except Exception as e:
        printExceptionDetailsToStdErr()


def _dummyOpen(*args, **kwargs):
    try:
        r = pylink.getEyeLink().dummy_open()
        return r
    except Exception as e:
        printExceptionDetailsToStdErr()


def _getCalibrationMessage(*args, **kwargs):
    try:
        m = pylink.getEyeLink().getCalibrationMessage()
        r = pylink.getEyeLink().getCalibrationResult()
        if r in _eyeLinkCalibrationResultDict:
            r = _eyeLinkCalibrationResultDict[r]
        else:
            r = 'NO_REPLY'
        rString = 'Last Calibration Message:\n{0}\n\nLastCalibrationResult:\n{1}'.format(
            m, r)
        return rString
    except Exception as e:
        printExceptionDetailsToStdErr()


def _setIPAddress(*args, **kwargs):
    try:
        if len(args) == 1:
            ipString = args[0]
            r = pylink.getEyeLink().setAddress(ipString)
            if r == 0:
                return True
        return [
            'EYE_TRACKER_ERROR',
            'setIPAddress',
            'Could not Parse IP String']
    except Exception as e:
        printExceptionDetailsToStdErr()


def _setLockEye(*args, **kwargs):
    try:
        if len(args) == 1:
            enable = args[0]
            r = pylink.getEyeLink().sendCommand('lock_eye_after_calibration %d' % (enable))
            return r
        return ['EYE_TRACKER_ERROR', 'setLockEye',
                'One argument is required, bool type.']
    except Exception as e:
        printExceptionDetailsToStdErr()


def _setNativeRecordingFileSaveDir(*args):
    try:
        if len(args) > 0:
            edfpath = args[0]
            print2err('Setting File Save path: ', edfpath)
            EyeTracker._local_edf_dir = edfpath
    except Exception as e:
        printExceptionDetailsToStdErr()
