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# Source code for fabio.cbfimage

    """
    Authors: Jérôme Kieffer, ESRF
             email:jerome.kieffer@esrf.fr

    Cif Binary Files images are 2D images written by the Pilatus detector and others.
    They use a modified (simplified) byte-offset algorithm.

    CIF is a library for manipulating Crystallographic information files and tries
    to conform to the specification of the IUCR
    """
    __author__ = "Jérôme Kieffer"
    __contact__ = "jerome.kieffer@esrf.eu"
    __license__ = "GPLv3+"
    __copyright__ = "European Synchrotron Radiation Facility, Grenoble, France"
    __version__ = ["Generated by CIF.py: Jan 2005 - April 2012",
                  "Written by Jerome Kieffer: Jerome.Kieffer@esrf.eu",
                  "On-line data analysis / ISDD ", "ESRF Grenoble (France)"]

    import os, logging
    logger = logging.getLogger("cbfimage")
    import numpy
    from fabioimage import fabioimage
    from compression import decByteOffet_numpy, md5sum, compByteOffet_numpy
    #import time

    DATA_TYPES = { "signed 8-bit integer"   : numpy.int8,
                   "signed 16-bit integer"  : numpy.int16,
                   "signed 32-bit integer"  : numpy.int32,
                   "signed 64-bit integer"  : numpy.int64
                    }

    MINIMUM_KEYS = ["X-Binary-Size-Fastest-Dimension",
                    'ByteOrder',
                    'Data type',
                    'X dimension',
                    'Y dimension',
                    'Number of readouts']

    STARTER = "\x0c\x1a\x04\xd5"
    PADDING = 512

    class cbfimage(fabioimage):
        """
        Read the Cif Binary File data format
        """
        def __init__(self, data=None , header=None, fname=None):
            """
            Constructor of the class CIF Binary File reader.

            @param _strFilename: the name of the file to open
            @type  _strFilename: string
            """
            fabioimage.__init__(self, data, header)
            self.cif = CIF()
            if fname is not None: #load the file)
                self.read(fname)

        @staticmethod
        def checkData(data=None):
            if data is None:
                return None
            elif numpy.issubdtype(data.dtype, int):
                return data
            else:
                return data.astype(int)

        def _readheader(self, inStream):
            """
            Read in a header in some CBF format from a string representing binary stuff

            @param inStream: file containing the Cif Binary part.
            @type inStream: opened file.
            """
            self.cif.loadCIF(inStream, _bKeepComment=True)

    #        backport contents of the CIF data to the headers
            for key in self.cif:
                if key != "_array_data.data":
                    self.header_keys.append(key)
                    self.header[key] = self.cif[key].strip(" \"\n\r\t")

            if not "_array_data.data" in self.cif:
                raise Exception("cbfimage: CBF file %s is corrupt, cannot find data block with '_array_data.data' key" % self.fname)

            inStream2 = self.cif["_array_data.data"]
            sep = "\r\n"
            iSepPos = inStream2.find(sep)
            if iSepPos < 0 or iSepPos > 80:
                sep = "\n" #switch back to unix representation

            lines = inStream2.split(sep)
            for oneLine in lines[1:]:
                if len(oneLine) < 10:
                    break
                try:
                    key, val = oneLine.split(':' , 1)
                except ValueError:
                    key, val = oneLine.split('=' , 1)
                key = key.strip()
                self.header_keys.append(key)
                self.header[key] = val.strip(" \"\n\r\t")
            missing = []
            for item in MINIMUM_KEYS:
                if item not in self.header_keys:
                    missing.append(item)
            if len(missing) > 0:
                logger.debug("CBF file misses the keys " + " ".join(missing))

        def read(self, fname, frame=None):
            """
            Read in header into self.header and
                the data   into self.data
            """
            self.filename = fname
            self.header = {}
            self.resetvals()

            infile = self._open(fname, "rb")
            self._readheader(infile)
            # Compute image size
            try:
                self.dim1 = int(self.header['X-Binary-Size-Fastest-Dimension'])
                self.dim2 = int(self.header['X-Binary-Size-Second-Dimension'])
            except:
                raise Exception(IOError, "CBF file %s is corrupt, no dimensions in it" % fname)
            try:
                bytecode = DATA_TYPES[self.header['X-Binary-Element-Type']]
                self.bpp = len(numpy.array(0, bytecode).tostring())
            except KeyError:
                bytecode = numpy.int32
                self.bpp = 32
                logger.warning("Defaulting type to int32")
            if self.header["conversions"] == "x-CBF_BYTE_OFFSET":
                self.data = self._readbinary_byte_offset(self.cif["_array_data.data"]).astype(bytecode).reshape((self.dim2, self.dim1))
            else:
                raise Exception(IOError, "Compression scheme not yet supported, please contact FABIO development team")

            self.bytecode = self.data.dtype.type
            self.resetvals()
    #        # ensure the PIL image is reset
            self.pilimage = None
            return self

        def _readbinary_byte_offset(self, inStream):
            """
            Read in a binary part of an x-CBF_BYTE_OFFSET compressed image

            @param inStream: the binary image (without any CIF decorators)
            @type inStream: python string.
            @return: a linear numpy array without shape and dtype set
            @rtype: numpy array
            """
            startPos = inStream.find(STARTER) + 4
            data = inStream[ startPos: startPos + int(self.header["X-Binary-Size"])]
            try:
                import byte_offset
            except ImportError:
                logger.warning("Error in byte_offset part: Falling back to Numpy implementation")
                myData = decByteOffet_numpy(data, size=self.dim1 * self.dim2)
            else:
                myData = byte_offset.analyseCython(data, size=self.dim1 * self.dim2)

            assert len(myData) == self.dim1 * self.dim2
            return myData

        def write(self, fname):
            """
            write the file in CBF format
            @param fname: name of the file
            @type: string
            """
            if self.data is not None:
                self.dim2, self.dim1 = self.data.shape
            else:
                raise RuntimeError("CBF image contains no data")
            binary_blob = compByteOffet_numpy(self.data)
    #        l = len(binary_blob)
    #        if (l % PADDING) != 0:
    #            rem = PADDING - (l % PADDING)
    #            binary_blob += "\x00" * rem
            dtype = "Unknown"
            for key, value in DATA_TYPES.iteritems():
                if value == self.data.dtype:
                    dtype = key
            binary_block = [
                            "--CIF-BINARY-FORMAT-SECTION--",
                            "Content-Type: application/octet-stream;",
                            '     conversions="x-CBF_BYTE_OFFSET"',
                            'Content-Transfer-Encoding: BINARY',
                            "X-Binary-Size: %d" % (len(binary_blob)),
                            "X-Binary-ID: 1",
                            'X-Binary-Element-Type: "%s"' % (dtype),
                            "X-Binary-Element-Byte-Order: LITTLE_ENDIAN" ,
                            "Content-MD5: %s" % md5sum(binary_blob),
                            "X-Binary-Number-of-Elements: %s" % (self.dim1 * self.dim2),
                            "X-Binary-Size-Fastest-Dimension: %d" % self.dim1,
                            "X-Binary-Size-Second-Dimension: %d" % self.dim2,
                            "X-Binary-Size-Padding: %d" % 1,
                            "",
                            STARTER + binary_blob,
                            "",
                            "--CIF-BINARY-FORMAT-SECTION----"
                            ]

            if "_array_data.header_contents" not in self.header:
                nonCifHeaders = []
            else:
                nonCifHeaders = [i.strip()[2:] for i in self.header["_array_data.header_contents"].split("\n") if i.find("# ") >= 0]

            for key in self.header:
                if (key not in self.header_keys):
                    self.header_keys.append(key)
            for key in self.header_keys:
                if key.startswith("_") :
                    if key not in self.cif or self.cif[key] != self.header[key]:
                        self.cif[key] = self.header[key]
                elif key.startswith("X-Binary-"):
                    pass
                elif key.startswith("Content-"):
                    pass
                elif key.startswith("conversions"):
                    pass
                elif key.startswith("filename"):
                    pass
                elif key in self.header:
                    nonCifHeaders.append("%s %s" % (key, self.header[key]))
            if len(nonCifHeaders) > 0:
                self.cif["_array_data.header_contents"] = "\r\n".join(["# %s" % i for i in nonCifHeaders])

            self.cif["_array_data.data"] = "\r\n".join(binary_block)
            self.cif.saveCIF(fname, linesep="\r\n", binary=True)

    ################################################################################
    # CIF class
    ################################################################################
    class CIF(dict):
        """
        This is the CIF class, it represents the CIF dictionary;
        and as a a python dictionary thus inherits from the dict built in class.
        """
        EOL = ["\r", "\n", "\r\n", "\n\r"]
        BLANK = [" ", "\t"] + EOL
        START_COMMENT = ["\"", "\'"]
        BINARY_MARKER = "--CIF-BINARY-FORMAT-SECTION--"

        def __init__(self, _strFilename=None):
            """
            Constructor of the class.

            @param _strFilename: the name of the file to open
            @type  _strFilename: filename (str) or file object
            """
            dict.__init__(self)
            self._ordered = []
            if _strFilename is not None: #load the file)
                self.loadCIF(_strFilename)

        def __setitem__(self, key, value):
            if key not in self._ordered:
                self._ordered.append(key)
            return dict.__setitem__(self, key, value)

        def pop(self, key):
            if key  in self._ordered:
                self._ordered.remove(key)
            return dict.pop(self, key)

        def popitem(self, key):
            if key  in self._ordered:
                self._ordered.remove(key)
            return dict.popitem(self, key)

        def loadCIF(self, _strFilename, _bKeepComment=False):
            """Load the CIF file and populates the CIF dictionary into the object
            @param _strFilename: the name of the file to open
            @type  _strFilename: string
            @param _strFilename: the name of the file to open
            @type  _strFilename: string
            @return: None
            """

            if isinstance(_strFilename, (str, unicode)):
                if os.path.isfile(_strFilename):
                    infile = open(_strFilename, "rb")
                else:
                    raise RuntimeError("CIF.loadCIF: No such file to open: %s" % _strFilename)
            #elif isinstance(_strFilename, file, bz2.BZ2File, ):
            elif "read" in dir(_strFilename):
                infile = _strFilename
            else:
                raise RuntimeError("CIF.loadCIF: what is %s type %s" % (_strFilename, type(_strFilename)))
            if _bKeepComment:
                self._parseCIF(infile.read())
            else:
                self._parseCIF(CIF._readCIF(infile))
        readCIF = loadCIF

        @staticmethod
        def isAscii(_strIn):
            """
            Check if all characters in a string are ascii,

            @param _strIn: input string
            @type _strIn: python string
            @return: boolean
            @rtype: boolean
            """
            bIsAcii = True
            for i in _strIn:
                if ord(i) > 127:
                    bIsAcii = False
                    break
            return bIsAcii

        @staticmethod
        def _readCIF(_instream):
            """
            - Check if the filename containing the CIF data exists
            - read the cif file
            - removes the comments

            @param _instream: the file containing the CIF data
            @type _instream: open file in read mode
            @return: a string containing the raw data
            @rtype: string
            """
            if not "readlines" in dir(_instream):
                raise RuntimeError("CIF._readCIF(instream): I expected instream to be an opened file,\
                 here I got %s type %s" % (_instream, type(_instream)))
            lLinesRead = _instream.readlines()
            sText = ""
            for sLine in lLinesRead:
                iPos = sLine.find("#")
                if iPos >= 0:
                    if CIF.isAscii(sLine):
                        sText += sLine[:iPos] + os.linesep

                    if iPos > 80 :
                        logger.warning("This line is too long and could cause problems in PreQuest: %s", sLine)
                else :
                    sText += sLine
                    if len(sLine.strip()) > 80 :
                        logger.warning("This line is too long and could cause problems in PreQues: %s", sLine)
            return sText

        def _parseCIF(self, sText):
            """
            - Parses the text of a CIF file
            - Cut it in fields
            - Find all the loops and process
            - Find all the keys and values

            @param sText: the content of the CIF - file
            @type sText: string
            @return: Nothing, the data are incorporated at the CIF object dictionary
            @rtype: None
            """
            loopidx = []
            looplen = []
            loop = []
            #first of all : separate the cif file in fields
            lFields = CIF._splitCIF(sText.strip())
            #Then : look for loops
            for i in range(len(lFields)):
                if lFields[i].lower() == "loop_":
                    loopidx.append(i)
            if len(loopidx) > 0:
                for i in loopidx:
                    loopone, length, keys = CIF._analyseOneLoop(lFields, i)
                    loop.append([keys, loopone])
                    looplen.append(length)

                for i in range(len(loopidx) - 1, -1, -1):
                    f1 = lFields[:loopidx[i]] + lFields[loopidx[i] + looplen[i]:]
                    lFields = f1

                self["loop_"] = loop

            for i in range(len(lFields) - 1):
        #        print lFields[i], lFields[i+1]
                if len(lFields[i + 1]) == 0 : lFields[i + 1] = "?"
                if lFields[i][0] == "_" and lFields[i + 1][0] != "_":
                    self[lFields[i]] = lFields[i + 1]

        @staticmethod
        def _splitCIF(sText):
            """
            Separate the text in fields as defined in the CIF

            @param sText: the content of the CIF - file
            @type sText: string
            @return: list of all the fields of the CIF
            @rtype: list
            """
            lFields = []
            while True:
                if len(sText) == 0:
                    break
                elif sText[0] == "'":
                    idx = 0
                    bFinished = False
                    while not  bFinished:
                        idx += 1 + sText[idx + 1:].find("'")
        ##########debuging    in case we arrive at the end of the text
                        if idx >= len(sText) - 1:
        #                    print sText,idx,len(sText)
                            lFields.append(sText[1:-1].strip())
                            sText = ""
                            bFinished = True
                            break

                        if sText[idx + 1] in CIF.BLANK:
                            lFields.append(sText[1:idx].strip())
                            sText1 = sText[idx + 1:]
                            sText = sText1.strip()
                            bFinished = True

                elif sText[0] == '"':
                    idx = 0
                    bFinished = False
                    while not  bFinished:
                        idx += 1 + sText[idx + 1:].find('"')
        ##########debuging    in case we arrive at the end of the text
                        if idx >= len(sText) - 1:
        #                    print sText,idx,len(sText)
                            lFields.append(sText[1:-1].strip())
    #                        print lFields[-1]
                            sText = ""
                            bFinished = True
                            break

                        if sText[idx + 1] in CIF.BLANK:
                            lFields.append(sText[1:idx].strip())
    #                        print lFields[-1]
                            sText1 = sText[idx + 1:]
                            sText = sText1.strip()
                            bFinished = True
                elif sText[0] == ';':
                    if sText[1:].strip().find(CIF.BINARY_MARKER) == 0:
                        idx = sText[32:].find(CIF.BINARY_MARKER)
                        if idx == -1:
                            idx = 0
                        else:
                            idx += 32 + len(CIF.BINARY_MARKER)
                    else:
                        idx = 0
                    bFinished = False
                    while not  bFinished:
                        idx += 1 + sText[idx + 1:].find(';')
                        if sText[idx - 1] in CIF.EOL:
                            lFields.append(sText[1:idx - 1].strip())
                            sText1 = sText[idx + 1:]
                            sText = sText1.strip()
                            bFinished = True
                else:
                    f = sText.split(None, 1)[0]
                    lFields.append(f)
    #                print lFields[-1]
                    sText1 = sText[len(f):].strip()
                    sText = sText1
            return lFields

        @staticmethod
        def _analyseOneLoop(lFields, iStart):
            """Processes one loop in the data extraction of the CIF file
            @param lFields: list of all the words contained in the cif file
            @type lFields: list
            @param iStart: the starting index corresponding to the "loop_" key
            @type iStart: integer
            @return: the list of loop dictionaries, the length of the data
                extracted from the lFields and the list of all the keys of the loop.
            @rtype: tuple
            """
        #    in earch loop we first search the length of the loop
        #    print lFields
    #        curloop = {}
            loop = []
            keys = []
            i = iStart + 1
            bFinished = False
            while not bFinished:
                if lFields[i][0] == "_":
                    keys.append(lFields[i])#.lower())
                    i += 1
                else:
                    bFinished = True
            data = []
            while True:
                if i >= len(lFields):
                    break
                elif len(lFields[i]) == 0:
                    break
                elif lFields[i][0] == "_":
                    break
                elif lFields[i] in ["loop_", "stop_", "global_", "data_", "save_"]:
                    break
                else:
                    data.append(lFields[i])
                    i += 1
            #print len(keys), len(data)
            k = 0

            if len(data) < len(keys):
                element = {}
                for j in keys:
                    if k < len(data):
                        element[j] = data[k]
                    else :
                        element[j] = "?"
                    k += 1
                #print element
                loop.append(element)

            else:
                #print data
                #print keys
                for i in range(len(data) / len(keys)):
                    element = {}
                    for j in keys:
                        element[j] = data[k]
                        k += 1
        #            print element
                    loop.append(element)
        #    print loop
            return loop, 1 + len(keys) + len(data), keys

    #############################################################################################
    ########     everything needed to  write a cif file #########################################
    #############################################################################################

        def saveCIF(self, _strFilename="test.cif", linesep=os.linesep, binary=False):
            """Transforms the CIF object in string then write it into the given file
            @param _strFilename: the of the file to be written
            @param linesep: line separation used (to force compatibility with windows/unix)
            @param binary: Shall we write the data as binary (True only for imageCIF/CBF)
            @type param: string
            """
            if binary:
                mode = "wb"
            else:
                mode = "w"
            try:
                fFile = open(_strFilename, mode)
            except IOError:
                print("Error during the opening of file for write: %s" %
                                                                _strFilename)
                return
            fFile.write(self.tostring(_strFilename, linesep))
            try:
                fFile.close()
            except IOError:
                print("Error during the closing of file for write: %s" %
                                                                 _strFilename)

        def tostring(self, _strFilename=None, linesep=os.linesep):
            """
            Converts a cif dictionnary to a string according to the CIF syntax

            @param _strFilename: the name of the filename to be appended in the header of the CIF file
            @type _strFilename: string
            @return: a sting that corresponds to the content of the CIF - file.

            """
    #        sCifText = ""
            lstStrCif = ["# " + i for i in __version__]
            if "_chemical_name_common" in self:
                t = self["_chemical_name_common"].split()[0]
            elif _strFilename is not None:
                t = os.path.splitext(os.path.split(str(_strFilename).strip())[1])[0]
            else:
                t = ""
            lstStrCif.append("data_%s" % (t))
            #first of all get all the keys :
            lKeys = self.keys()
            lKeys.sort()
            for key in lKeys[:]:
                if key in self._ordered:
                    lKeys.remove(key)
            self._ordered += lKeys

            for sKey in self._ordered:
                if sKey == "loop_":
                    continue
                if sKey not in self:
                    self._ordered.remove(sKey)
                    logger.debug("Skipping key %s from ordered list as no more present in dict")
                    continue
                sValue = str(self[sKey])
                if sValue.find("\n") > -1: #should add value  between ;;
                    lLine = [sKey, ";", sValue, ";", ""]
                elif len(sValue.split()) > 1: #should add value between ''
                    sLine = "%s        '%s'" % (sKey, sValue)
                    if len(sLine) > 80:
                        lLine = [str(sKey), sValue]
                    else:
                        lLine = [sLine]
                else:
                    sLine = "%s        %s" % (sKey, sValue)
                    if len(sLine) > 80:
                        lLine = [str(sKey), sValue]
                    else:
                        lLine = [sLine]
                lstStrCif += lLine
            if self.has_key("loop_"):
                for loop in self["loop_"]:
                    lstStrCif.append("loop_ ")
                    lKeys = loop[0]
                    llData = loop[1]
                    lstStrCif += [" %s" % (sKey) for sKey in lKeys]
                    for lData in llData:
                        sLine = " "
                        for key in lKeys:
                            sRawValue = lData[key]
                            if sRawValue.find("\n") > -1: #should add value  between ;;
                                lstStrCif += [sLine, ";", str(sRawValue), ";"]
                                sLine = " "
                            else:
                                if len(sRawValue.split()) > 1: #should add value between ''
                                    value = "'%s'" % (sRawValue)
                                else:
                                    value = str(sRawValue)
                                if len(sLine) + len(value) > 78:
                                    lstStrCif += [sLine]
                                    sLine = " " + value
                                else:
                                    sLine += " " + value
                        lstStrCif.append(sLine)
                    lstStrCif.append("")
            return linesep.join(lstStrCif)

        def exists(self, sKey):
            """
            Check if the key exists in the CIF and is non empty.
            @param sKey: CIF key
            @type sKey: string
            @param cif: CIF dictionary
            @return: True if the key exists in the CIF dictionary and is non empty
            @rtype: boolean
            """
            bExists = False
            if self.has_key(sKey):
                if len(self[sKey]) >= 1:
                    if self[sKey][0] not in ["?", "."]:
                        bExists = True
            return bExists

        def existsInLoop(self, sKey):
            """
            Check if the key exists in the CIF dictionary.
            @param sKey: CIF key
            @type sKey: string
            @param cif: CIF dictionary
            @return: True if the key exists in the CIF dictionary and is non empty
            @rtype: boolean
            """
            if not self.exists("loop_"):
                return False
            bExists = False
            if not bExists:
                for i in self["loop_"]:
                    for j in i[0]:
                        if j == sKey:
                            bExists = True
            return bExists

        def loadCHIPLOT(self, _strFilename):
            """
            Load the powder diffraction CHIPLOT file and returns the
            pd_CIF dictionary in the object

            @param _strFilename: the name of the file to open
            @type  _strFilename: string
            @return: the CIF object corresponding to the powder diffraction
            @rtype: dictionary
            """
            if not os.path.isfile(_strFilename):
                print "I cannot find the file %s" % _strFilename
                raise
            lInFile = open(_strFilename, "r").readlines()
            self["_audit_creation_method"] = 'From 2-D detector using FIT2D and CIFfile'
            self["_pd_meas_scan_method"] = "fixed"
            self["_pd_spec_description"] = lInFile[0].strip()
            try:
                iLenData = int(lInFile[3])
            except ValueError:
                iLenData = None
            lOneLoop = []
            try:
                f2ThetaMin = float(lInFile[4].split()[0])
                last = ""
                for sLine in lInFile[-20:]:
                    if sLine.strip() != "":
                        last = sLine.strip()
                f2ThetaMax = float(last.split()[0])
                limitsOK = True

            except (ValueError, IndexError):
                limitsOK = False
                f2ThetaMin = 180.0
                f2ThetaMax = 0
    #        print "limitsOK:", limitsOK
            for sLine in lInFile[4:]:
                sCleaned = sLine.split("#")[0].strip()
                data = sCleaned.split()
                if len(data) == 2 :
                    if not limitsOK:
                        f2Theta = float(data[0])
                        if f2Theta < f2ThetaMin :
                            f2ThetaMin = f2Theta
                        if f2Theta > f2ThetaMax :
                            f2ThetaMax = f2Theta
                    lOneLoop.append({ "_pd_meas_intensity_total": data[1] })
            if not iLenData:
                iLenData = len(lOneLoop)
            assert (iLenData == len(lOneLoop))
            self[ "_pd_meas_2theta_range_inc" ] = "%.4f" % ((f2ThetaMax - f2ThetaMin) / (iLenData - 1))
            if self[ "_pd_meas_2theta_range_inc" ] < 0:
                self[ "_pd_meas_2theta_range_inc" ] = abs (self[ "_pd_meas_2theta_range_inc" ])
                tmp = f2ThetaMax
                f2ThetaMax = f2ThetaMin
                f2ThetaMin = tmp
            self[ "_pd_meas_2theta_range_max" ] = "%.4f" % f2ThetaMax
            self[ "_pd_meas_2theta_range_min" ] = "%.4f" % f2ThetaMin
            self[ "_pd_meas_number_of_points" ] = str(iLenData)
            self["loop_"] = [ [ ["_pd_meas_intensity_total" ], lOneLoop ] ]

        @staticmethod
        def LoopHasKey(loop, key):
            "Returns True if the key (string) exist in the array called loop"""
            try:
                loop.index(key)
                return True
            except ValueError:
                return False

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