# Source code for drizzlepac.nicmosData

    """
    Class used to model NICMOS specific instrument data.

    :Authors: Christopher Hanley, David Grumm, Megan Sosey

    :License: `<http://www.stsci.edu/resources/software_hardware/pyraf/LICENSE>`_

    """
    from __future__ import absolute_import, division, print_function # confidence medium

    from stsci.tools import fileutil
    from nictools import readTDD
    import numpy as np
    from .imageObject import imageObject

    class NICMOSInputImage(imageObject):

        SEPARATOR = '_'

        def __init__(self, filename=None):
            imageObject.__init__(self,filename)
            self.timeExt = 'TIME'

            # define the cosmic ray bits value to use in the dq array
            self.cr_bits_value = 4096

            # Detector parameters, nic only has 1 detector in each file
            self.full_shape = (256,256)
            self._instrument=self._image['PRIMARY'].header["INSTRUME"]
            self.native_units = 'COUNTS/S'

            self.flatkey = 'FLATFILE'

            for chip in range(1,self._numchips+1,1):
                self._image[self.scienceExt,chip].cte_dir = 0   #no correction for nicmos

            self._effGain = 1. #get the specific gain from the detector subclass

        def _assignSignature(self, chip):
            """assign a unique signature for the image based
               on the  instrument, detector, chip, and size
               this will be used to uniquely identify the appropriate
               static mask for the image

               this also records the filename for the static mask to the outputNames dictionary

            """
            sci_chip = self._image[self.scienceExt,chip]
            ny=sci_chip._naxis1
            nx=sci_chip._naxis2
            detnum = sci_chip.detnum
            instr=self._instrument

            sig=(instr+str(self._detector),(nx,ny),int(detnum)) #signature is a tuple
            sci_chip.signature=sig #signature is a tuple

        def doUnitConversions(self):
            """Convert the data to electrons

            This converts all science data extensions and saves
            the results back to disk. We need to make sure
            the data inside the chips already in memory is altered as well.

            """

             # Image information
            _handle = fileutil.openImage(self._filename, mode='readonly', memmap=False)

            for det in range(1,self._numchips+1,1):

                chip=self._image[self.scienceExt,det]

                if chip._gain is not None:

                    #conversionFactor = (self.getExpTime() * self.getGain())
                    conversionFactor = chip._gain
                    if self.isCountRate():
                        conversionFactor *= chip._exptime
                        counts_str = 'COUNTS/S'
                    else:
                        counts_str = 'COUNTS'

                    # Multiply the values of the sci extension pixels by the gain.
                    print("Converting %s[%s,%d] from %s to ELECTRONS"%(self._filename,self.scienceExt,det,counts_str))
                    """
                    # If the exptime is 0 the science image will be zeroed out.
                    np.multiply(_handle[self.scienceExt,det].data,conversionFactor,_handle[self.scienceExt,det].data)
                    #chip.data=_handle[self.scienceExt,det].data.copy()

                    # Set the BUNIT keyword to 'electrons'
                    chip.header.update('BUNIT','ELECTRONS')
                    _handle[0].header.update('BUNIT','ELECTRONS')

                    # Update the PHOTFLAM value
                    photflam = _handle[0].header['PHOTFLAM']
                    _handle[0].header.update('PHOTFLAM',(photflam/chip._gain))

                    chip._effGain = 1.0
                    """
                    chip._effGain = chip._gain
                    chip._conversionFactor = conversionFactor
                else:
                    msg = "Invalid gain value for data, no conversion done"
                    print(msg)
                    raise ValueError(msg)

            # Close the files and clean-up
            _handle.close()

            self._effGain = conversionFactor #1.0

        def _setchippars(self):
            self._setDefaultReadnoise()

        def getexptimeimg(self,chip):
            """
            Return an array representing the exposure time per pixel for the detector.

            Returns
            -------
            dark: array
                Exposure time array in the same shape as the input image

            """
            return self._image[self.timeExt,chip].data

        def getflat(self,chip):
            """
            Method for retrieving a detector's flat field.

            Returns
            -------
            flat : array
                The flat field array in the same shape as the input image with **units of cps**.
            """

            flat = (1.0/super(NICMOSInputImage,self).getflat(chip))# The reference flat field is inverted
            return flat

        def getdarkcurrent(self):
            """
            Return the dark current for the NICMOS detectors.

            Returns
            -------
            darkcurrent : float
                Dark current value with **units of cps**.

            """

            try:
                darkcurrent = self._image[0].header['exptime'] * \
                                self._image[self.scienceExt,1]._darkrate
            except:
                str =  "#############################################\n"
                str += "#                                           #\n"
                str += "# Error:                                    #\n"
                str += "#   Cannot find the value for 'EXPTIME'     #\n"
                str += "#   in the image header.  NICMOS input      #\n"
                str += "#   images are expected to have this header #\n"
                str += "#   keyword.                                #\n"
                str += "#                                           #\n"
                str += "#Error occured in the NICMOSInputImage class#\n"
                str += "#                                           #\n"
                str += "#############################################\n"
                raise ValueError(str)

            return darkcurrent

        def getdarkimg(self,chip):
            """
            Return an array representing the dark image for the detector.

            Returns
            -------
            dark : array
                The dark array in the same shape as the image with **units of cps**.

            """

            # Read the temperature dependeant dark file.  The name for the file is taken from
            # the TEMPFILE keyword in the primary header.
            tddobj = readTDD.fromcalfile(self.name)

            if tddobj is None:
                return np.ones(self.full_shape, dtype=self.image_dtype) * self.getdarkcurrent()
            else:
                # Create Dark Object from AMPGLOW and Lineark Dark components
                darkobj = tddobj.getampglow() + tddobj.getlindark()

                # Return the darkimage taking into account an subarray information available
                return darkobj[self.ltv2:self.size2,self.ltv1:self.size1]

        def isCountRate(self):
            """
            isCountRate: Method or IRInputObject used to indicate if the
            science data is in units of counts or count rate.  This method
            assumes that the keyword 'BUNIT' is in the header of the input
            FITS file.
            """
            has_bunit = False
            if 'BUNIT' in self._image['sci',1].header :
                has_bunit = True

            countrate = False
            if (self._image[0].header['UNITCORR'].strip() == 'PERFORM') or \
                (has_bunit and self._image['sci',1].header['bunit'].find('/') != -1) :
                countrate = True

            return countrate

    class NIC1InputImage(NICMOSInputImage):

        def __init__(self, filename=None):
            NICMOSInputImage.__init__(self,filename)
            self._effGain = 1. #get the gain from the detector subclass
            self._detector=self._image["PRIMARY"].header["CAMERA"]
            self.proc_unit = "native"

        def _getDarkRate(self):
            _darkrate = 0.08 #electrons/s
            if self.proc_unit == 'native':
                _darkrate = _darkrate / self._effGain # DN/s

            return _darkrate

        def _getDefaultReadnoise(self):
            """ This could be updated to calculate the readnoise from the NOISFILE.
            """
            _rdnoise = 26.0 # electrons
            if self.proc_unit == 'native':
                _rdnoise = _rdnoise / self._effGain # ADU

            return _rdnoise

        def setInstrumentParameters(self, instrpars):
            """ This method overrides the superclass to set default values into
                the parameter dictionary, in case empty entries are provided.
            """
            pri_header = self._image[0].header

            self.proc_unit = instrpars['proc_unit']

            if self._isNotValid (instrpars['gain'], instrpars['gnkeyword']):
                instrpars['gnkeyword'] = 'ADCGAIN' #gain has been hardcoded below

            if self._isNotValid (instrpars['rdnoise'], instrpars['rnkeyword']):
                instrpars['rnkeyword'] = None
            if self._isNotValid (instrpars['exptime'], instrpars['expkeyword']):
                instrpars['expkeyword'] = 'EXPTIME'

            for chip in self.returnAllChips(extname=self.scienceExt):

                chip._gain= 5.4 #measured gain

                chip._rdnoise   = self.getInstrParameter(instrpars['rdnoise'], pri_header,
                                                         instrpars['rnkeyword'])
                chip._exptime   = self.getInstrParameter(instrpars['exptime'], pri_header,
                                                         instrpars['expkeyword'])

                if chip._gain is None or self._exptime is None:
                    print('ERROR: invalid instrument task parameter')
                    raise ValueError

                # We need to treat Read Noise as a special case since it is
                # not populated in the NICMOS primary header
                if chip._rdnoise is None:
                    chip._rdnoise = self._getDefaultReadnoise()

                chip._darkrate=self._getDarkRate()
                chip.darkcurrent = self.getdarkcurrent()

                chip._effGain = chip._gain
                self._assignSignature(chip._chip) #this is used in the static mask, static mask name also defined here, must be done after outputNames

            # Convert the science data to electrons if specified by the user.
            self.doUnitConversions()

    class NIC2InputImage(NICMOSInputImage):
        def __init__(self,filename=None):
            NICMOSInputImage.__init__(self,filename)
            self._effGain=1. #measured
            self._detector=self._image["PRIMARY"].header["CAMERA"]
            self.proc_unit = "native"

        def _getDarkRate(self):
            _darkrate = 0.08 #electrons/s
            if self.proc_unit == 'native':
                _darkrate = _darkrate / self._effGain # DN/s

            return _darkrate

        def _getDefaultReadnoise(self):
            _rdnoise = 26.0 #electrons
            if self.proc_unit == 'native':
                _rdnoise = _rdnoise/self._effGain #ADU

            return _rdnoise

        def setInstrumentParameters(self, instrpars):
            """ This method overrides the superclass to set default values into
                the parameter dictionary, in case empty entries are provided.
            """
            pri_header = self._image[0].header

            self.proc_unit = instrpars['proc_unit']

            if self._isNotValid (instrpars['gain'], instrpars['gnkeyword']):
                instrpars['gnkeyword'] = 'ADCGAIN' #gain has been hardcoded below

            if self._isNotValid (instrpars['rdnoise'], instrpars['rnkeyword']):
                instrpars['rnkeyword'] = None
            if self._isNotValid (instrpars['exptime'], instrpars['expkeyword']):
                instrpars['expkeyword'] = 'EXPTIME'

            for chip in self.returnAllChips(extname=self.scienceExt):

                chip._gain= 5.4 #measured gain

                chip._rdnoise   = self.getInstrParameter(instrpars['rdnoise'], pri_header,
                                                         instrpars['rnkeyword'])
                chip._exptime   = self.getInstrParameter(instrpars['exptime'], pri_header,
                                                         instrpars['expkeyword'])

                if chip._gain is None or self._exptime is None:
                    print('ERROR: invalid instrument task parameter')
                    raise ValueError

                # We need to treat Read Noise as a special case since it is
                # not populated in the NICMOS primary header
                if chip._rdnoise is None:
                    chip._rdnoise = self._getDefaultReadnoise()

                chip._darkrate=self._getDarkRate()
                chip.darkcurrent = self.getdarkcurrent()

                chip._effGain = chip._gain
                self._assignSignature(chip._chip) #this is used in the static mask, static mask name also defined here, must be done after outputNames

            # Convert the science data to electrons if specified by the user.
            self.doUnitConversions()

        def createHoleMask(self):
            """Add in a mask for the coronographic hole to the general static pixel mask.
            """
            pass

    class NIC3InputImage(NICMOSInputImage):
        def __init__(self,filename=None):
            NICMOSInputImage.__init__(self,filename)
            self._detector=self._image["PRIMARY"].header["CAMERA"] #returns 1,2,3
            self._effGain = 1.
            self.proc_unit = "native"

        def _getDarkRate(self):
            _darkrate = 0.15 #electrons/s
            if self.proc_unit == 'native':
                _darkrate = _darkrate/self._effGain #DN/s

            return _darkrate

        def _getDefaultReadnoise(self):
            _rdnoise = 29.0 # electrons
            if self.proc_unit == 'native':
                _rdnoise = _rdnoise/self._effGain #ADU

            return _rdnoise

        def setInstrumentParameters(self, instrpars):
            """ This method overrides the superclass to set default values into
                the parameter dictionary, in case empty entries are provided.
            """
            pri_header = self._image[0].header

            self.proc_unit = instrpars['proc_unit']

            if self._isNotValid (instrpars['gain'], instrpars['gnkeyword']):
                instrpars['gnkeyword'] = 'ADCGAIN'
            if self._isNotValid (instrpars['rdnoise'], instrpars['rnkeyword']):
                instrpars['rnkeyword'] = None
            if self._isNotValid (instrpars['exptime'], instrpars['expkeyword']):
                instrpars['expkeyword'] = 'EXPTIME'

            for chip in self.returnAllChips(extname=self.scienceExt):

                chip._gain= 6.5 #measured gain

                chip._rdnoise   = self.getInstrParameter(instrpars['rdnoise'], pri_header,
                                                         instrpars['rnkeyword'])
                chip._exptime   = self.getInstrParameter(instrpars['exptime'], pri_header,
                                                         instrpars['expkeyword'])

                if chip._gain is None or self._exptime is None:
                    print('ERROR: invalid instrument task parameter')
                    raise ValueError

                # We need to treat Read Noise as a special case since it is
                # not populated in the NICMOS primary header
                if chip._rdnoise is None:
                    chip._rdnoise = self._getDefaultReadnoise()

                chip._darkrate=self._getDarkRate()
                chip.darkcurrent = self.getdarkcurrent()

                chip._effGain = chip._gain
                self._assignSignature(chip._chip) #this is used in the static mask, static mask name also defined here, must be done after outputNames

            # Convert the science data to electrons if specified by the user.
            self.doUnitConversions()