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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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import time

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

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if os.name == 'nt':

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    # on windows, desktop shortcut launches Beremiz.py

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    # with working dir set to mingw/bin.

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    # then we prefix CWD to PATH in order to ensure that

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    # commands invoked from Makefiles will first resolve

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    # to here.

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    os.environ["PATH"] = os.getcwd()+';'+os.environ["PATH"]

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class toolchain_makefile():

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    def __init__(self, CTRInstance):

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        self.CTRInstance = CTRInstance

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        self.md5key = None 

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        self.buildpath = None

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

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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.md5key = None

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    def GetBinaryCode(self):

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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 IOError, e:

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                return None

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    def concat_deps(self, bn):

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        # read source

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

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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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        # recurse through deps

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        # TODO detect cicular deps.

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        return reduce(operator.concat, map(self.concat_deps, deps), src)

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    def build(self):

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        srcfiles= []

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        cflags = []

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        wholesrcdata = "" 

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

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            # Get CFiles list to give it to makefile

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            for CFile, CFLAGS in CFilesAndCFLAGS:

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                CFileName = os.path.basename(CFile)

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                wholesrcdata += self.concat_deps(CFileName)

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                srcfiles.append(CFileName)

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                if CFLAGS not in cflags:

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                    cflags.append(CFLAGS)

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        oldmd5 = self.md5key

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

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        props = self.CTRInstance.GetProjectProperties()

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        self.md5key += '#'.join([props[key] for key in ['companyName',

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                                                        'projectName',

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                                                        'productName']])

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        self.md5key += '#' #+','.join(map(str,time.localtime()))

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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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        if oldmd5 != self.md5key :

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            target = self.CTRInstance.GetTarget().getcontent()

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            beremizcommand = {"src": ' '.join(srcfiles),

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                              "cflags": ' '.join(cflags),

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                              "md5": self.md5key,

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                              "buildpath": self.buildpath

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                             }

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            command = [ token % beremizcommand for token in target.getCommand().split(' ')]

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            # Call Makefile to build PLC code and link it with target specific code

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            status, result, err_result = ProcessLogger(self.CTRInstance.logger,

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                                                       command).spin()

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            if status :

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                self.md5key = None

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                self.CTRInstance.logger.write_error(_("C compilation failed.\n"))

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                return False

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            return True

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        else :

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            self.CTRInstance.logger.write(_("Source didn't change, no build.\n"))

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            return True

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