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import os

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from subprocess import Popen,PIPE

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from ..toolchain_makefile import toolchain_makefile

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import hashlib

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class LPC_target(toolchain_makefile):

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    #extension = ".ld"

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    #DebugEnabled = False

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        self.binmd5key = None

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    def _GetBinMD5FileName(self):

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        return os.path.join(self.buildpath, "lastbuildPLCbin.md5")

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    def _get_md5_header(self):

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        """Returns signature header"""

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        size = int(Popen(

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             ['arm-elf-size','-B',os.path.join(self.buildpath,"ArmPLC_rom.elf")],

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             stdout=PIPE).communicate()[0].splitlines()[1].split()[0])

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        res = "&" + hashlib.md5(open(os.path.join(self.buildpath, "ArmPLC_rom.bin"), "rb").read(size)).hexdigest() + '\n' +\

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              "$" + str(size) + '\n'

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        return res

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    def GetBinaryCode(self):

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        """Returns ready to send signed + sized intel formated hex program"""

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        try:

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            res = self._get_md5_header() +\

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                   open(os.path.join(self.buildpath, "ArmPLC_rom.hex"), "r").read()

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            return res

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        except Exception, e:

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            return None

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    def _get_cached_md5_header(self):

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        if self.binmd5key is not None:

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            return self.binmd5key

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        else:

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            try:

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                return open(self._GetBinMD5FileName(), "r").read()

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            except IOError, e:

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                return None

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    def ResetBinaryCodeMD5(self, mode):

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        if mode == "BOOTLOADER":

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            self.binmd5key = None

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            try:

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                os.remove(self._GetBinMD5FileName())

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            except Exception, e:

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                pass

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        else:

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            return toolchain_makefile.ResetBinaryCodeMD5(self)

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    def GetBinaryCodeMD5(self, mode):

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        if mode == "BOOTLOADER":

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            return self._get_cached_md5_header()

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        else:

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            return toolchain_makefile.GetBinaryCodeMD5(self)

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    def build(self):

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        res = toolchain_makefile.build(self)

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        if res:

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            self.binmd5key = self._get_md5_header()

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            f = open(self._GetBinMD5FileName(), "w")

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            f.write(self.binmd5key)

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            f.close()

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            try:

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                    _("Binary is %s bytes long\n")%

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                        str(os.path.getsize(

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                            os.path.join(self.buildpath, "ArmPLC_rom.bin"))))

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            except Exception, e:

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                pass

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        return res

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