# -*- coding: utf-8 -*-
# Part of the psychopy.iohub library.
# Copyright (C) 2012-2016 iSolver Software Solutions
# Distributed under the terms of the GNU General Public License (GPL).
# .. fileauthor:: Martin Guest
# .. fileauthor:: Sol Simpson

from __future__ import division
from ......errors import print2err, printExceptionDetailsToStdErr
from ......constants import EventConstants, EyeTrackerConstants
from ..... import Computer, Device
from .... import EyeTrackerDevice
from ....eye_events import *
from gevent import socket
import sys, errno

ET_UNDEFINED = EyeTrackerConstants.UNDEFINED
getTime = Computer.getTime

if sys.platform == 'win32':
    # GP3 sends the Windows QPC value for each sample. getGP3Time() returns
    # the current QPC time. This is used to calculate the sample qpc 'delay'
    # which is then used to caclulate the sample time in iohub timebase.
    from ctypes import byref, c_int64, windll
    _fcounter_ = c_int64()
    _qpfreq_ = c_int64()
    windll.Kernel32.QueryPerformanceFrequency(byref(_qpfreq_))
    _qpfreq_ = float(_qpfreq_.value)
    _winQPC_ = windll.Kernel32.QueryPerformanceCounter

    def getGP3Time():
        _winQPC_(byref(_fcounter_))
        return _fcounter_.value / _qpfreq_
else:
    print2err("WARNING: IOHUB ONLY SUPPORTS GAZEPOINT ON WINDOWS.")
    # TODO: Implement on other platforms if possible
    # GP3 is only supported on Windows by iohub, 
    # so this will never actually be used.
    def getGP3Time():
        return getTime()        
        
def to_numeric(lit):
    """Return value of a numeric literal string. If the string can not be
    converted then the original string is returned.

    :param lit:
    :return:

    """
    # Handle '0'
    if lit == '0':
        return 0
    # Hex/Binary
    litneg = lit[1:] if lit[0] == '-' else lit
    if litneg[0] == '0':
        if litneg[1] in 'xX':
            return int(lit, 16)
        elif litneg[1] in 'bB':
            return int(lit, 2)
        else:
            try:
                return int(lit, 8)
            except ValueError:
                pass

    # Int/Float/Complex
    try:
        return int(lit)
    except ValueError:
        pass
    try:
        return float(lit)
    except ValueError:
        pass
    try:
        return complex(lit)
    except ValueError:
        pass

    # return original str
    return lit


class EyeTracker(EyeTrackerDevice):
    """
    The Gazepoint GP3 implementation of the Common Eye Tracker Interface can be
    used by providing the following EyeTracker class path as the eye tracker
    device name in the iohub_config.yaml device settings file::

        eyetracker.hw.gazepoint.gp3.EyeTracker

    .. note:: The Gazepoint control application **must** be running
              while using this interface.

    The Gazepoint GP3 interface supports:
    * connection / disconnection to the GP3 device.
    * Starting the GP3 Calibration procedure.
    * Starting / stopping when eye position data is collected.
    * Sending text messages to the GP3 system.
    * Current gaze position information, using the FPOGX, FPOGY fields from
      the most receint REC message received from the GP3
    * Generation of the BinocularEyeSampleEvent type based on the GP3 REC
      message type. The following fields of an eye sample event are populated
      populated:
        * device_time: uses TIME field of the REC message
        * logged_time: the time the REC message was received / read.
        * time: currently set to equal the time the REC message was received.
        * left_gaze_x: uses LFOGX
        * left_gaze_y: uses LFOGY
        * right_gaze_x: uses RFOGX
        * right_gaze_y: uses RFOGY
        * combined_gaze_x: uses FPOGX
        * combined_gaze_Y: uses FPOGY
        * left_pupil_size: uses LPD and is diameter in pixels
        * right_pupil_size: uses RPD and is diamter in pixels
    * Creates FixationStart and FixationEnd events by parsing the FPOGx fields 
      of REC messages from the GP3.

    The Gazepoint GP3 interface uses a polling method to check for new eye
    tracker data. The default polling interval is 5 msec. This can be changed
    in the device's configuration settings for the experiment if needed.
    """

    # GP3 tracker times are received as msec
    #
    DEVICE_TIMEBASE_TO_SEC = 1.0
    EVENT_CLASS_NAMES = [
        'MonocularEyeSampleEvent',
        'BinocularEyeSampleEvent',
        'FixationStartEvent',
        'FixationEndEvent',
        'SaccadeStartEvent',
        'SaccadeEndEvent',
        'BlinkStartEvent',
        'BlinkEndEvent']
    _recording = False
    __slots__ = ['_gp3', '_rx_buffer', '_ttfreq', '_last_fix_evt']

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

        # Holds the GP3 socket interface
        self._gp3 = None

        # Holds data received from GP3 tracker that has not yet been parsed
        # into messages
        self._rx_buffer = ''

        # Used to hold the last sample processed by iohub.
        self._latest_sample = None

        # Used to hold the last valid gaze position processed by ioHub.
        # If the last sample received from the GP3 indicates missing eye
        # position, then this is set to None
        #
        self._latest_gaze_position = None

        # Connect to the eye tracker server by default.
        self.setConnectionState(True)
        
        self._gp3get("TIME_TICK_FREQUENCY")
        self._ttfreq = self._waitForAck('TIME_TICK_FREQUENCY').get("FREQ")

        self._last_fix_evt = None
        
    def trackerTime(self):
        """
        Current eye tracker time in the eye tracker's native time base.
        The GP3 system uses a sec.usec timebase based on the Windows QPC.

        Args:
            None

        Returns:
            float: current native eye tracker time in sec.msec format.
        """
        return getGP3Time()

    def trackerSec(self):
        """
        Same as the GP3 implementation of trackerTime().
        """
        if self._gp3:
            return self.trackerTime() * self.DEVICE_TIMEBASE_TO_SEC
        return EyeTrackerConstants.EYETRACKER_ERROR
        
    def _sendRequest(self, rtype, ID, **kwargs):
        params = ''
        for k,v in kwargs.items():
            params += ' {}="{}"'.format(k, v)
        rqstr = '<{} ID="{}" {} />\r\n'.format(rtype, ID, params)
        #print2err("Sending: {}\n".format(rqstr))
        self._gp3.sendall(str.encode(rqstr))        
        
    def _gp3set(self, ID, **kwargs):
        self._sendRequest("SET", ID, **kwargs)     

    def _gp3get(self, ID, **kwargs):
        self._sendRequest("GET", ID, **kwargs)     
        
    def _waitForAck(self, type_id, timeout=5.0):
        stime = getTime()
        while getTime() - stime < timeout:
            self._checkForNetData(0.25)
            msgs = self._parseRxBuffer()
            for m in msgs:
                if m.get('ID') == type_id:
                    return m
        return None

    def _checkForNetData(self, timeout=0):
        self._gp3.settimeout(timeout)
        while True:
            try:
                rxdat = self._gp3.recv(4096)
                if rxdat:
                    self._rx_buffer += bytes.decode(rxdat).replace('\r\n', '')
                    return self._rx_buffer
                else:
                    print2err('***** GP3 Closed Connection *****')
                    # Connection closed
                    self.setRecordingState(False)
                    self.setConnectionState(False)
                    self._rx_buffer = ''
                    return None

            except socket.error as e:
                err = e.args[0]
                if err == errno.EAGAIN or err == errno.EWOULDBLOCK or err == 'timed out':
                    # non blocking socket found no data; it happens.
                    return self._rx_buffer
                else:
                    # a valid error occurred
                    print2err('***** _checkForNetData Error *****')
                    printExceptionDetailsToStdErr()
                    return self._rx_buffer

    def _parseRxBuffer(self):
        msgs = []
        while self._rx_buffer:
            msg_end_ix = self._rx_buffer.find('/>')
            if msg_end_ix >= 0:
                msgtxt = self._rx_buffer[:msg_end_ix]
                msg_start_ix = msgtxt.find('<')
                if len(msgtxt) > 1 and msg_start_ix >= 0:
                    msgtxt = msgtxt[msg_start_ix + 1:]
                    msgtoks = msgtxt.split()
                    if msgtoks:
                        msg = dict(type=msgtoks[0])
                        for t in msgtoks[1:]:
                            tkey, tval = t.split('=')
                            try:
                                msg[tkey] = to_numeric(tval.strip('"'))
                            except Exception:
                                msg[tkey] = tval
                        msgs.append(msg)
                else:
                    print2err('Incomplete Message Found: [', msgtxt, ']')
                self._rx_buffer = self._rx_buffer[msg_end_ix + 2:]
            else:
                break
        return msgs

    def setConnectionState(self, enable):
        """Connects or disconnects from the GP3 eye tracking hardware.

        By default, when ioHub is started, a connection is automatically made,
        and when the experiment completes and ioHub is closed, so is the GP3
        connection.
        Args:
            enable (bool): True = enable the connection, False = disable the connection.

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

        """
        if enable is True and self._gp3 is None:
            try:
                self._rx_buffer = ''
                self._gp3 = socket.socket()
                address = ('127.0.0.1', 4242)
                self._gp3.connect(address)
                init_connection_str = ''
                #init_connection_str = '<SET ID="ENABLE_SEND_CURSOR" STATE="1" />\r\n'
                init_connection_str += '<SET ID="ENABLE_SEND_POG_LEFT" STATE="1" />\r\n'
                init_connection_str += '<SET ID="ENABLE_SEND_POG_RIGHT" STATE="1" />\r\n'
                #init_connection_str += '<SET ID="ENABLE_SEND_USER_DATA" STATE="1"/>\r\n'
                init_connection_str += '<SET ID="ENABLE_SEND_PUPIL_LEFT" STATE="1" />\r\n'
                init_connection_str += '<SET ID="ENABLE_SEND_PUPIL_RIGHT" STATE="1" />\r\n'
                init_connection_str += '<SET ID="ENABLE_SEND_POG_FIX" STATE="1" />\r\n'
                init_connection_str += '<SET ID="ENABLE_SEND_POG_BEST" STATE="1" />\r\n'
                init_connection_str += '<SET ID="ENABLE_SEND_COUNTER" STATE="1" />\r\n'
                init_connection_str += '<SET ID="ENABLE_SEND_TIME" STATE="1" />\r\n'
                init_connection_str += '<SET ID="ENABLE_SEND_TIME_TICK" STATE="1" />\r\n'
                init_connection_str += '<SET ID="ENABLE_SEND_DATA" STATE="0" />\r\n'
                self._gp3.sendall(str.encode(init_connection_str))
                
                # block for upp to 1 second to get reply txt.
                #strStatus = self._checkForNetData(1.0)
                #print2err("strStatus: ",strStatus)
                                
                if self._waitForAck('ENABLE_SEND_TIME_TICK'):
                    self._rx_buffer = ''
                    return True
                else:
                    return False

            except socket.error as e:
                if e.args[0] == 10061:
                    print2err(
                        '***** Socket Error: Check Gazepoint control software is running *****')
                print2err('Error connecting to GP3 ', e)
        elif enable is False and self._gp3:
            try:
                if self._gp3:
                    self.setRecordingState(False)
                self._gp3.close()
                self._gp3 = None
                self._rx_buffer = ''
            except Exception:
                print2err('Problem disconnecting from device - GP3')
                self._rx_buffer = ''
        return self.isConnected()

    def isConnected(self):
        """isConnected returns whether the GP3 is connected to the experiment
        PC and if the tracker state is valid. Returns True if the tracker can
        be put into Record mode, etc and False if there is an error with the
        tracker or tracker connection with the experiment PC.

        Args:
            None

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

        """
        return self._gp3 is not None

    def sendMessage(self, message_contents, time_offset=None):
        """
        The sendMessage method sends the message_contents str to the GP3.
        """
        try:
            if time_offset is not None:
                print2err(
                    'Warning: GP3 EyeTracker.sendMessage time_offset arguement is ignored by this eye tracker interface.')
            if self._gp3 and self.isRecordingEnabled() is True:
                strMessage = '<SET ID="USER_DATA" VALUE="{0}"/>\r\n'.format(
                    message_contents)
                self._gp3.sendall(strMessage)
        except Exception:
            print2err('Problems sending message: {0}'.FORMAT(message_contents))
            printExceptionDetailsToStdErr()
        return EyeTrackerConstants.EYETRACKER_OK

    def enableEventReporting(self, enabled=True):
        """enableEventReporting is functionally identical to the eye tracker
        device specific setRecordingState method."""

        try:
            self.setRecordingState(enabled)
            enabled = EyeTrackerDevice.enableEventReporting(self, enabled)
            return enabled
        except Exception as e:
            print2err('Exception in EyeTracker.enableEventReporting: ', str(e))
            printExceptionDetailsToStdErr()

    def setRecordingState(self, recording):
        """setRecordingState is used to start or stop the recording of data
        from the eye tracking device.

        args:
           recording (bool): if True, the eye tracker will start recordng available
              eye data and sending it to the experiment program if data streaming
              was enabled for the device. If recording == False, then the eye
              tracker stops recording eye data and streaming it to the experiment.

        If the eye tracker is already recording, and setRecordingState(True) is
        called, the eye tracker will simple continue recording and the method call
        is a no-op. Likewise if the system has already stopped recording and
        setRecordingState(False) is called again.

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

        Return:trackerTime
            bool: the current recording state of the eye tracking device

        """
        current_state = self.isRecordingEnabled()
        if self._gp3 and recording is True and current_state is False:
            self._rx_buffer = ''
            self._gp3.sendall(
                str.encode('<SET ID="ENABLE_SEND_DATA" STATE="1" />\r\n'))
            rxdat = self._checkForNetData(1.0)
            if rxdat is None:
                EyeTracker._recording = False
                return EyeTrackerDevice.enableEventReporting(self, False)
            EyeTracker._recording = True
        elif self._gp3 and recording is False and current_state is True:
            self._rx_buffer = ''
            self._gp3.sendall(
                str.encode('<SET ID="ENABLE_SEND_DATA" STATE="0" />\r\n'))
            rxdat = self._checkForNetData(1.0)          
            EyeTracker._recording = False
            self._latest_sample = None
            self._latest_gaze_position = None
        return EyeTrackerDevice.enableEventReporting(self, recording)

    def isRecordingEnabled(self):
        """isRecordingEnabled returns the recording state from the eye tracking
        device.

        Args:
           None

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

        """
        if self._gp3:
            return self._recording
        return False

    def runSetupProcedure(self,starting_state=None):
        """runSetupProcedure opens the GP3 Calibration window.
        """
        
        cal_config = self.getConfiguration().get('calibration')
        targ_timeout = cal_config.get('target_duration')
        targ_delay = cal_config.get('target_delay')
        self._gp3set('CALIBRATE_TIMEOUT', VALUE=targ_timeout)  
        self._gp3set('CALIBRATE_DELAY', VALUE=targ_delay)        
        self._waitForAck('CALIBRATE_DELAY', timeout=2.0)

        self._gp3set('CALIBRATE_SHOW', STATE=1)  
        self._gp3set('CALIBRATE_START', STATE=1)  
        cal_result = self._waitForAck('CALIB_RESULT', timeout=30.0)

        if cal_result:        
            #print2err("GP3 calibration done.")
            #print2err("Closing GP3 calibration window....")
            self._gp3set('CALIBRATE_SHOW', STATE=0)  
            self._gp3get('CALIBRATE_RESULT_SUMMARY')
    
            cal_result['SUMMARY']=self._waitForAck('CALIBRATE_RESULT_SUMMARY')
        #print2err("CAL_RESULT: ",cal_result)
        return cal_result
        
    def _poll(self):
        """This method is called by gp3 every n msec based on the polling
        interval set in the eye tracker config.

        Default is 5 msec

        """
        try:
            if not self.isRecordingEnabled():
                return

            logged_time = Computer.getTime()
            tracker_time = getGP3Time()

            # Check for any new rx data from gp3 socket.
            # If None is returned, that means the gp3 closed the socket
            # connection.
            if self._checkForNetData() is None:
                return

            # Parse any rx text received from the gp3 into msg dicts.
            msgs = self._parseRxBuffer()
            for m in msgs:   
                if m.get('type') == 'REC':
                    binocSample = self._parseSampleFromMsg(m, logged_time, tracker_time)
                    self._addNativeEventToBuffer(binocSample)

                    # left / right eye pos avg. data
                    combined_gaze_x = m.get('FPOGX', ET_UNDEFINED)
                    combined_gaze_y = m.get('FPOGY', ET_UNDEFINED)
                    combined_gaze_x, combined_gaze_y = self._eyeTrackerToDisplayCoords(
                        (combined_gaze_x, combined_gaze_y))
        
                    
                    if combined_gaze_x is not None and combined_gaze_y is not None:
                        self._latest_gaze_position = (combined_gaze_x, combined_gaze_y)
                    else:
                        self._latest_gaze_position = None
            
                    for fix_evt in self._parseFixationFromMsg(m, logged_time, tracker_time):
                        self._addNativeEventToBuffer(fix_evt)

                elif m.get('type') == 'ACK':
                    pass #print2err('ACK Received: ', m)
                else:
                    # Message type is not being handled.
                    print2err('UNHANDLED GP3 MESSAGE: ', m)

            self._last_poll_time = logged_time

        except Exception:
            print2err('ERROR occurred during GP3 Sample Callback.')
            printExceptionDetailsToStdErr()
        finally:
            return 0

    def _parseFixationFromMsg(self, m, logged_time, tracker_time):
        fix_evts = []
        fix_valid = m.get('FPOGV', ET_UNDEFINED)
        if fix_valid == 1:
            fix_x , fix_y = self._eyeTrackerToDisplayCoords((m.get('FPOGX',
                                                                   ET_UNDEFINED),
                                                             m.get('FPOGY', 
                                                                   ET_UNDEFINED)
                                                            )
                                                           )
            fix_stime = m.get('FPOGS', ET_UNDEFINED)
            fix_duration = m.get('FPOGD', ET_UNDEFINED)
            fix_id = m.get('FPOGID', ET_UNDEFINED)        
            m = dict(FPOGID=fix_id, FPOGV=fix_valid, FPOGX=fix_x, FPOGY=fix_y, 
                     FPOGS=fix_stime, FPOGD=fix_duration, 
                     TIME=int(m.get('TIME')),
                     TIME_TICK=int(m.get('TIME_TICK')))

            if self._last_fix_evt is None:
                # Create start fixation evt based on m
                fix_evts = self._createStartFixEvt(m, logged_time, tracker_time)            
            elif fix_id != self._last_fix_evt.get('FPOGID'):
                # Create Fixation end evt based on self._last_fix_evt
                fix_evts = self._createEndFixEvt(self._last_fix_evt, logged_time, tracker_time)
                # Create start fixation evt based on m
                fstart = self._createStartFixEvt(m, logged_time, tracker_time)
                fix_evts.extend(fstart)
                
            self._last_fix_evt = m
            
        return fix_evts
        
    def _createStartFixEvt(self, m, logged_time, tracker_time):
        # Create start fixation evt based on m
        # GP3 does not craete separate left and right eye fix evts, so we
        # create a left and right fix evt each time.
        gaze = m.get('FPOGX', ET_UNDEFINED), m.get('FPOGY', ET_UNDEFINED)

        evt_tick_time = int(m.get('TIME_TICK', ET_UNDEFINED))
        evt_tick_sec = evt_tick_time / self._ttfreq
   
        sample_delay = tracker_time-evt_tick_sec 
        fix_dur = m.get('FPOGD', ET_UNDEFINED)
        iohub_time = logged_time - sample_delay - fix_dur
        confidence_interval = logged_time - self._last_poll_time
        device_time = m.get('FPOGS', ET_UNDEFINED)
        etype = EventConstants.FIXATION_START
        estatus = 0
        
        sel = [
            0,                                      # exp ID
            0,                                      # sess ID
            0,  # device id (not currently used)
            Device._getNextEventID(),              # event ID
            etype,                                  # event type
            device_time,
            logged_time,
            iohub_time,
            confidence_interval,
            sample_delay,
            0,
            EyeTrackerConstants.LEFT_EYE,                              # eye
            gaze[0],                                # gaze x
            gaze[1],                                # gaze y
            ET_UNDEFINED,                                     # gaze z
            ET_UNDEFINED,                                # angle x
            ET_UNDEFINED,                                # angle y
            ET_UNDEFINED,                                   # raw x
            ET_UNDEFINED,                                   # raw y
            ET_UNDEFINED,                    # pupil measure 1
            ET_UNDEFINED,                    # pupil measure type 1
            ET_UNDEFINED,                    # pupil measure 2
            ET_UNDEFINED,                    # pupil measure 2 type
            ET_UNDEFINED,                                 # ppd x
            ET_UNDEFINED,                                 # ppd y
            ET_UNDEFINED,                                    # velocity x
            ET_UNDEFINED,                                    # velocity y
            ET_UNDEFINED,                                # velocity xy
            estatus                                  # status
        ]
        
        ser = list(sel)
        ser[3]=Device._getNextEventID()
        ser[11]=EyeTrackerConstants.RIGHT_EYE
        
        return [sel, ser]
    
    def _createEndFixEvt(self, m, logged_time, tracker_time):
        # Create end fixation evt based on m
        etype = EventConstants.FIXATION_END
        estatus = 0
        
        gaze = m.get('FPOGX', ET_UNDEFINED), m.get('FPOGY', ET_UNDEFINED)


        evt_tick_time = int(m.get('TIME_TICK', ET_UNDEFINED))
        evt_tick_sec = evt_tick_time / self._ttfreq
   
        sample_delay = tracker_time-evt_tick_sec 
        fix_dur = m.get('FPOGD', ET_UNDEFINED)
        iohub_time = logged_time - sample_delay
        confidence_interval = logged_time - self._last_poll_time
        device_time = m.get('FPOGS', ET_UNDEFINED)+fix_dur

        confidence_interval = logged_time - self._last_poll_time

        iohub_time = logged_time - sample_delay

        eel = [0,
               0,
               0,  # device id (not currently used)
               Device._getNextEventID(),
               etype,
               device_time,
               logged_time,
               iohub_time,
               confidence_interval,
               sample_delay,
               0,
               EyeTrackerConstants.LEFT_EYE,
               fix_dur,
               ET_UNDEFINED,
               ET_UNDEFINED,
               ET_UNDEFINED,
               ET_UNDEFINED,
               ET_UNDEFINED,
               ET_UNDEFINED,
               ET_UNDEFINED,
               ET_UNDEFINED,
               ET_UNDEFINED,
               ET_UNDEFINED,
               ET_UNDEFINED,
               ET_UNDEFINED,
               ET_UNDEFINED,
               ET_UNDEFINED,
               ET_UNDEFINED,
               ET_UNDEFINED,
               ET_UNDEFINED,
               ET_UNDEFINED,
               ET_UNDEFINED,
               ET_UNDEFINED,
               ET_UNDEFINED,
               ET_UNDEFINED,
               ET_UNDEFINED,
               ET_UNDEFINED,
               ET_UNDEFINED,
               ET_UNDEFINED,
               ET_UNDEFINED,
               ET_UNDEFINED,
               ET_UNDEFINED,
               ET_UNDEFINED,
               ET_UNDEFINED,
               ET_UNDEFINED,
               gaze[0],
               gaze[1],
               ET_UNDEFINED,
               ET_UNDEFINED,
               ET_UNDEFINED,
               ET_UNDEFINED,
               ET_UNDEFINED,
               ET_UNDEFINED,
               ET_UNDEFINED,
               ET_UNDEFINED,
               ET_UNDEFINED,
               ET_UNDEFINED,
               ET_UNDEFINED,
               ET_UNDEFINED,
               ET_UNDEFINED,
               ET_UNDEFINED,
               ET_UNDEFINED,
               ET_UNDEFINED,
               ET_UNDEFINED,
               estatus
               ]

        eer = list(eel)
        eer[3]=Device._getNextEventID()
        eer[11]=EyeTrackerConstants.RIGHT_EYE
     
        return [eel, eer]
        
    def _parseSampleFromMsg(self, m, logged_time, tracker_time):
        # Always tracks binoc, so always use BINOCULAR_EYE_SAMPLE
        event_type = EventConstants.BINOCULAR_EYE_SAMPLE

        # in seconds, take from the REC TIME field
        event_timestamp = m.get('TIME', ET_UNDEFINED)

        evt_tick_time = int(m.get('TIME_TICK', ET_UNDEFINED))
        evt_tick_sec = evt_tick_time / self._ttfreq
   
        event_delay = tracker_time-evt_tick_sec 
        #print2err('event_delay: ',event_delay)

        iohub_time = logged_time - event_delay

        confidence_interval = logged_time - self._last_poll_time

        left_gaze_x = m.get('LPOGX', ET_UNDEFINED)
        left_gaze_y = m.get('LPOGY', ET_UNDEFINED)
        left_gaze_x, left_gaze_y = self._eyeTrackerToDisplayCoords(
            (left_gaze_x, left_gaze_y))
        left_pupil_size = m.get(
            'LPD', ET_UNDEFINED)  # diameter of pupil in pixels

        right_gaze_x = m.get('RPOGX', ET_UNDEFINED)
        right_gaze_y = m.get('RPOGY', ET_UNDEFINED)
        right_gaze_x, right_gaze_y = self._eyeTrackerToDisplayCoords(
            (right_gaze_x, right_gaze_y))
        right_pupil_size = m.get(
            'RPD', ET_UNDEFINED)  # diameter of pupil in pixels

        #
        # The X and Y-coordinates of the left and right eye pupil
        # in the camera image, as a fraction of the
        # camera image size.
        left_raw_x = m.get('LPCX', ET_UNDEFINED)
        left_raw_y = m.get('LPCY', ET_UNDEFINED)
        right_raw_x = m.get('RPCX', ET_UNDEFINED)
        right_raw_y = m.get('RPCY', ET_UNDEFINED)

        left_eye_status = m.get('LPOGV', ET_UNDEFINED)
        right_eye_status = m.get('RPOGV', ET_UNDEFINED)

        # 0 = both eyes OK
        status = 0
        if left_eye_status == right_eye_status and right_eye_status == 0:
            # both eyes are missing
            status = 22
        elif left_eye_status == 0:
            # Just left eye missing
            status = 20
        elif right_eye_status == 0:
            # Just right eye missing
            status = 2

        return [
            0,  # experiment_id, iohub fills in automatically
            0,  # session_id, iohub fills in automatically
            0,  # device id, keep at 0
            Device._getNextEventID(),  # iohub event unique ID
            event_type,  # BINOCULAR_EYE_SAMPLE
            event_timestamp,  # eye tracker device time stamp
            logged_time,  # time _poll is called
            iohub_time,
            confidence_interval,
            event_delay,
            0,
            left_gaze_x,
            left_gaze_y,
            ET_UNDEFINED,
            ET_UNDEFINED,
            ET_UNDEFINED,
            ET_UNDEFINED,
            ET_UNDEFINED,
            ET_UNDEFINED,
            left_raw_x,
            left_raw_y,
            left_pupil_size,
            EyeTrackerConstants.PUPIL_DIAMETER,
            ET_UNDEFINED,
            ET_UNDEFINED,
            ET_UNDEFINED,
            ET_UNDEFINED,
            ET_UNDEFINED,
            ET_UNDEFINED,
            ET_UNDEFINED,
            right_gaze_x,
            right_gaze_y,
            ET_UNDEFINED,
            ET_UNDEFINED,
            ET_UNDEFINED,
            ET_UNDEFINED,
            ET_UNDEFINED,
            ET_UNDEFINED,
            right_raw_x,
            right_raw_y,
            right_pupil_size,
            EyeTrackerConstants.PUPIL_DIAMETER,
            ET_UNDEFINED,
            ET_UNDEFINED,
            ET_UNDEFINED,
            ET_UNDEFINED,
            ET_UNDEFINED,
            ET_UNDEFINED,
            ET_UNDEFINED,
            status
        ]        

    def _getIOHubEventObject(self, native_event_data):
        """The _getIOHubEventObject method is called by the ioHub Process to
        convert new native device event objects that have been received to the
        appropriate ioHub Event type representation."""
        self._latest_sample = native_event_data
        return self._latest_sample

    def _eyeTrackerToDisplayCoords(self, eyetracker_point):
        """Converts GP3 gaze positions to the Display device coordinate space.

        TODO: Check if thgis works for 0.0,0.0 being left,top to 1.0,1.0

        """

        gaze_x, gaze_y = eyetracker_point
        left, top, right, bottom = self._display_device.getCoordBounds()
        w, h = right - left, top - bottom
        x, y = left + w * gaze_x, bottom + h * (1.0 - gaze_y)

        #print2err("GP3: ",(eyetracker_point),(left,top,right,bottom),(x,y))
        return x, y

    def _displayToEyeTrackerCoords(self, display_x, display_y):
        """Converts a Display device point to GP3 gaze position coordinate
        space.

        TODO: Check if thgis works for 0.0,0.0 being left,top to 1.0,1.0

        """
        left, top, right, bottom = self._display_device.getCoordBounds()
        w, h = right - left, top - bottom

        return (left - display_x) / w, (top - display_y) / h

    def _close(self):
        if self._gp3:
            self.setRecordingState(False)
            self.setConnectionState(False)
        EyeTrackerDevice._close(self)
