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import os, re, operator

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from util.ProcessLogger import ProcessLogger

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import hashlib

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includes_re =  re.compile('\s*#include\s*["<]([^">]*)[">].*')

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class toolchain_gcc():

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    """

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    This abstract class contains GCC specific code.

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    It cannot be used as this and should be inherited in a target specific

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    class such as target_linux or target_win32

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    """

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    def __init__(self, CTRInstance):

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        self.CTRInstance = CTRInstance

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        self.buildpath = None

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        self.SetBuildPath(self.CTRInstance._getBuildPath())

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    def getBuilderCFLAGS(self):

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        """

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        Returns list of builder specific CFLAGS

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        """

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        return [self.CTRInstance.GetTarget().getcontent()["value"].getCFLAGS()]

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    def getBuilderLDFLAGS(self):

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        """

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        Returns list of builder specific LDFLAGS

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        """

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        return self.CTRInstance.LDFLAGS + \

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               [self.CTRInstance.GetTarget().getcontent()["value"].getLDFLAGS()]

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    def GetBinaryCode(self):

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        try:

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            return open(self.exe_path, "rb").read()

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        except Exception, e:

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            return None

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    def _GetMD5FileName(self):

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

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    def ResetBinaryCodeMD5(self):

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        self.md5key = None

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        try:

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            os.remove(self._GetMD5FileName())

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        except Exception, e:

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            pass

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    def GetBinaryCodeMD5(self):

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        if self.md5key is not None:

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            return self.md5key

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        else:

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            try:

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                return open(self._GetMD5FileName(), "r").read()

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            except Exception, e:

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                return None

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    def SetBuildPath(self, buildpath):

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        if self.buildpath != buildpath:

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            self.buildpath = buildpath

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            self.exe = self.CTRInstance.GetProjectName() + self.extension

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            self.exe_path = os.path.join(self.buildpath, self.exe)

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            self.md5key = None

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            self.srcmd5 = {}

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    def check_and_update_hash_and_deps(self, bn):

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        # Get latest computed hash and deps

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        oldhash, deps = self.srcmd5.get(bn,(None,[]))

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        # read source

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        src = open(os.path.join(self.buildpath, bn)).read()

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        # compute new hash

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        newhash = hashlib.md5(src).hexdigest()

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        # compare

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        match = (oldhash == newhash)

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        if not match:

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            # file have changed

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            # update direct dependencies

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            deps = []

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            for l in src.splitlines():

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                res = includes_re.match(l)

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                if res is not None:

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                    depfn = res.groups()[0]

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                    if os.path.exists(os.path.join(self.buildpath, depfn)):

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                        #print bn + " depends on "+depfn

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                        deps.append(depfn)

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            # store that hashand deps

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            self.srcmd5[bn] = (newhash, deps)

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        # recurse through deps

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        # TODO detect cicular deps.

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        return reduce(operator.and_, map(self.check_and_update_hash_and_deps, deps), match)

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    def build(self):

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        # Retrieve toolchain user parameters

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        toolchain_params = self.CTRInstance.GetTarget().getcontent()["value"]

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        self.compiler = toolchain_params.getCompiler()

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        self.linker = toolchain_params.getLinker()

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        Builder_CFLAGS = ' '.join(self.getBuilderCFLAGS())

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        ######### GENERATE OBJECT FILES ########################################

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        obns = []

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        objs = []

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        relink = False

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        for Location, CFilesAndCFLAGS, DoCalls in self.CTRInstance.LocationCFilesAndCFLAGS:

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            if CFilesAndCFLAGS:

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                if Location :

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                    self.CTRInstance.logger.write(".".join(map(str,Location))+" :\n")

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                else:

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                    self.CTRInstance.logger.write(_("PLC :\n"))

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            for CFile, CFLAGS in CFilesAndCFLAGS:

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                if CFile.endswith(".c"):

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                    bn = os.path.basename(CFile)

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                    obn = os.path.splitext(bn)[0]+".o"

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                    objectfilename = os.path.splitext(CFile)[0]+".o"

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                    match = self.check_and_update_hash_and_deps(bn)

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                    if match:

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                        self.CTRInstance.logger.write("   [pass]  "+bn+" -> "+obn+"\n")

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                    else:

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                        relink = True

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                        self.CTRInstance.logger.write("   [CC]  "+bn+" -> "+obn+"\n")

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                        status, result, err_result = ProcessLogger(

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                               self.CTRInstance.logger,

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                               "\"%s\" -c \"%s\" -o \"%s\" %s %s"%

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                                   (self.compiler, CFile, objectfilename, Builder_CFLAGS, CFLAGS)

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                               ).spin()

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                        if status :

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                            self.srcmd5.pop(bn)

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                            self.CTRInstance.logger.write_error(_("C compilation of %s failed.\n")%bn)

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                            return False

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                    obns.append(obn)

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                    objs.append(objectfilename)

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                elif CFile.endswith(".o"):

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                    obns.append(os.path.basename(CFile))

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                    objs.append(CFile)

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        ######### GENERATE library FILE ########################################

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        # Link all the object files into one binary file

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        self.CTRInstance.logger.write(_("Linking :\n"))

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        if relink:

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            objstring = []

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            # Generate list .o files

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            listobjstring = '"' + '"  "'.join(objs) + '"'

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            ALLldflags = ' '.join(self.getBuilderLDFLAGS())

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            self.CTRInstance.logger.write("   [CC]  " + ' '.join(obns)+" -> " + self.exe + "\n")

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            status, result, err_result = ProcessLogger(

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                   self.CTRInstance.logger,

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                   "\"%s\" %s -o \"%s\" %s"%

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                       (self.linker,

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                        listobjstring,

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                        self.exe_path,

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                        ALLldflags)

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                   ).spin()

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            if status :

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                return False

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        else:

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            self.CTRInstance.logger.write("   [pass]  " + ' '.join(obns)+" -> " + self.exe + "\n")

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        # Calculate md5 key and get data for the new created PLC

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        data=self.GetBinaryCode()

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        self.md5key = hashlib.md5(data).hexdigest()

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        # Store new PLC filename based on md5 key

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        f = open(self._GetMD5FileName(), "w")

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        f.write(self.md5key)

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        f.close()

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        return True

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