/*  This file is part of mhmake.
 *
 *  Copyright (C) 2001-2009 Marc Haesen
 *
 *  Mhmake is free software: you can redistribute it and/or modify
 *  it under the terms of the GNU General Public License as published by
 *  the Free Software Foundation, either version 3 of the License, or
 *  (at your option) any later version.
 *
 *  Mhmake is distributed in the hope that it will be useful,
 *  but WITHOUT ANY WARRANTY; without even the implied warranty of
 *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 *  GNU General Public License for more details.
 *
 *  You should have received a copy of the GNU General Public License
 *  along with Mhmake.  If not, see <http://www.gnu.org/licenses/>.
*/

/* $Rev$ */

#include "stdafx.h"

#include "rule.h"
#include "util.h"
#include "mhmakeparser.h"

static char s_UsageString[]=
"\
Usage: mhmake [-f <Makefile>] [-[c|C] <RunDir>] [<Var>=<Value>]\n\
              [-a] [-q] [-s] [-v] [targets]+\n"
#ifdef _DEBUG
"\
              [-p] [-n] [-e] [-l] [-w] [-d] [-CD] [-m] [-b]\n"
#endif
"\n\
  <Makefile>  : Makefile to load (if not specified 'makefile' is used\n\
  <RunDir>    : Make is setting the current directory to this directory at the\n\
                start.\n\
  <Var>       : Defines a variable\n\
  <Value>     : Value of the variable\n\
  -a          : Rebuild all targets\n\
  -s          : Rescan automatic dependencies\n\
  -v          : Print version information\n\
  -q          : Quiet. Disable all output \n"
#ifdef _DEBUG
"\n\
  The following options are additional options in mhmake_dbg which are not\n\
  available in mhmake. These are mainly options for debugging purposes.\n\
  -e          : Dump Vars and Rules on error\n\
  -w          : Print additional information\n\
  -p          : Prints the variables and the rules before building\n\
  -n          : Only prints the commands, but does not execute them\n\
  -l          : Print parser debug information\n\
  -d          : Print the dependency checking\n\
  -CD         : Do circular dependency checking (targets depending on itself)\n\
  -m          : Create md5 database in md5.database in start directory. \n\
  -b          : Print build tree. \n\
  -D          : Print all double defined rules (even if commands are the same) \n\
"
#else
"\
\n\
It is adviced during creation of makefiles to use mhmake_dbg. It has additional\n\
debugging options and does some extra error checking.\n\
For a description of the additional options: run mhmake_dbg -h\n\
"
#endif
;

#ifdef _DEBUG
bool g_PrintVarsAndRules=false;
bool g_DoNotExecute=false;
bool g_BuildMd5Db=false;
bool g_GenProjectTree=false;
bool g_DumpOnError=false;
bool g_PrintAdditionalInfo=false;
bool g_pPrintDependencyCheck=false;
bool g_CheckCircularDeps=false;
bool g_PrintLexYacc=false;
bool g_PrintMultipleDefinedRules=false;
#endif

bool g_Quiet=false;
bool g_RebuildAll=false;
bool g_ForceAutoDepRescan=false;

const string g_EmptyString;
const string g_SpaceString(" ");

///////////////////////////////////////////////////////////////////////////////
void PrintVersionInfo(void)
{
  static const char VersionStr[]="\
mhmake : GNU compatible make tool with extensions\n\
version: "MHMAKEVER"\n\
Remarks and bug reports -> Marc Haesen\n\
";
  cerr << VersionStr;
  exit(1);
}
///////////////////////////////////////////////////////////////////////////////
makecommand::makecommand()
{
  char ExeName[MAX_PATH];
#ifdef WIN32
  GetModuleFileName(NULL,ExeName,sizeof(ExeName));
  m_BuildCommand=ExeName;
  transform(m_BuildCommand.begin(),m_BuildCommand.end(),m_BuildCommand.begin(),(int(__CDECL *)(int))tolower);
#else
  int NrChars=readlink ("/proc/self/exe", ExeName, sizeof(ExeName));
  ExeName[NrChars]=0;
  m_BuildCommand=ExeName;
#endif
}

///////////////////////////////////////////////////////////////////////////////
string Substitute(const string &ToSubst,const string &iSrcStr,const string &iToStr)
{
  string Ret=g_EmptyString;
  matchres Res;
  string SrcStr=iSrcStr;
  string ToStr=iToStr;

  if (string::npos==SrcStr.find('%'))
  {
    string PerStr("%");
    SrcStr=PerStr+SrcStr;
    ToStr=PerStr+ToStr;
  }
  const char *pTmp=ToSubst.c_str();
  bool first=true;
  while (*pTmp)
  {
    if (!first)
    {
      Ret+=g_SpaceString;
    }
    else
    {
      first=false;
    }
    string Item;
    pTmp=NextItem(pTmp,Item);

    if (PercentMatch(Item,SrcStr,&Res))
    {
      Ret+=ReplaceWithStem(ToStr,Res.m_Stem);
    }
    else
    {
      Ret+=Item;
    }
  }

  return Ret;
}

///////////////////////////////////////////////////////////////////////////////
bool PercentMatch(const string &String,const string &Expr,matchres *pRes,const char Char)
{
  const char *pFirst=String.c_str();
  const char *pFirstExpr=Expr.c_str();
  while (*pFirstExpr && *pFirstExpr!=Char)
  {
    if (*pFirst!=*pFirstExpr)
      return false;
    pFirst++;
    pFirstExpr++;
  }

  if (!*pFirstExpr)
  {
    if (!*pFirst)
    {
      if (pRes)
      {
        pRes->m_First=String;
        pRes->m_Stem=pRes->m_Last=g_EmptyString;
      }
      return true;
    } else
      return false;
  }
  else if (!*pFirst)
    return false;

  const char *pEnd=pFirst+strlen(pFirst);

  const char *pLast=pEnd;
  const char *pLastExpr=pFirstExpr+strlen(pFirstExpr)-1;
  if (pLastExpr!=pFirstExpr)
  {
    pLast--;

    while (pLastExpr>pFirstExpr)
    {
      if (*pLastExpr!=*pLast)
        return false;
      pLastExpr--;
      pLast--;
    }
    pLast++;
  }
  string Stem=string(pFirst,pLast-pFirst);

  if (pRes)
  {
    pRes->m_First=string(String.c_str(),pFirst-String.c_str());

    pRes->m_Stem=Stem;

    pRes->m_Last=string(pLast,pEnd-pLast);
  }
  return true;
}
///////////////////////////////////////////////////////////////////////////////
bool PercentMatchList(const string &String,const string &ExprList,matchres *pRes)
{
  const char *pTmp=ExprList.c_str();
  while (*pTmp)
  {
    string Expr;
    pTmp=NextItem(pTmp,Expr);
    if (PercentMatch(String,Expr,pRes))
      return true;
  }
  return false;
}

///////////////////////////////////////////////////////////////////////////////
string ReplaceWithStem(const string &String,const string &Stem)
{
  string Ret=String;
  int Pos=Ret.find('%');
  while (Pos!=string::npos)
  {
    Ret=Ret.substr(0,Pos)+Stem+Ret.substr(Pos+1);
    Pos=Ret.find('%');
  }
  return Ret;
}

///////////////////////////////////////////////////////////////////////////////
refptr<loadedmakefile> LOADEDMAKEFILES::find(const loadedmakefile &ToSearch)
{
  vector<refptr<loadedmakefile> >::const_iterator It=begin();
  while (It!=end())
  {
    if (*(*It)==ToSearch)
      return *It;
    It++;
  }
  return refptr<loadedmakefile>();
}

LOADEDMAKEFILES g_LoadedMakefiles;

///////////////////////////////////////////////////////////////////////////////
loadedmakefile::loadedmakefile_statics::loadedmakefile_statics()
{
  m_GlobalCommandLineVars[MAKE]=g_MakeCommand;
  const char *pEnv=getenv(MHMAKECONF);
  if (pEnv)
  {
    m_GlobalCommandLineVars[MHMAKECONF]=pEnv;
    m_MhMakeConf=GetFileInfo(pEnv);

    // Get the revision of the working copy
    // We do it the fastest way: this means just parsing the entries file in the .svn directory of the mhmakeconf directory
    string EntriesFile=m_MhMakeConf->GetFullFileName()+OSPATHSEPSTR".svn"OSPATHSEPSTR"entries";
    FILE *pFile=fopen(EntriesFile.c_str(),"r");
    if (!pFile)
    {
      /* Entries file cannot be opened. Maybe it is not an svn working copy, so ignore it */
      #ifdef _DEBUG
      if (g_PrintAdditionalInfo) cout<<"Warning: Assuming no subversion working copy: Error opening "<<EntriesFile<<endl;
      #endif
      return;
    }

    /* Check the format of this file, if it is 8 it is the new format else it is the old format. We do
     * this by inspecting the first line of the file
     */
    char Line[255];
    if (fgets(Line,sizeof(Line),pFile))
    {
      int iVersion=atoi(Line);
      if (iVersion<8)
      {
        // This is the old format
        while (fgets(Line,sizeof(Line),pFile))
        {
          if (!strncmp(Line,"   url=\"",8))
          {
            char *pUrl=Line+8+7;
            char *pEnd=strchr(pUrl,'"');
            #ifdef _DEBUG
            if (!pEnd)
            {
              cerr<<"Format of entries file in .svn directory must have been changed. Update mhmake!\n";
              exit(1);
            }
            #endif
            *pEnd='\0';
            m_GlobalCommandLineVars[WC_URL]=pUrl;
          }
          if (!strncmp(Line,"   revision=\"",13))
          {
            char *pRevision=Line+13;
            char *pEnd=strchr(pRevision,'"');
            #ifdef _DEBUG
            if (!pEnd)
            {
              cerr<<"Format of entries file in .svn directory must have been changed. Update mhmake!\n";
              exit(1);
            }
            #endif
            *pEnd='\0';
            m_GlobalCommandLineVars[WC_REVISION]=pRevision;
            break;
          }
        }
      }
      else
      {
        /* This is the new format */
        fgets(Line,sizeof(Line),pFile);
        fgets(Line,sizeof(Line),pFile);
        if (fgets(Line,sizeof(Line),pFile))
        {
          Line[strlen(Line)-1]=0;
          m_GlobalCommandLineVars[WC_REVISION]=Line;
        }
        if (fgets(Line,sizeof(Line),pFile))
        {
          Line[strlen(Line)-1]=0;
          m_GlobalCommandLineVars[WC_URL]=Line+7;
        }
      }
    }
    fclose(pFile);
  }
}

///////////////////////////////////////////////////////////////////////////////
loadedmakefile::loadedmakefile(vector<string> &Args,const string&Makefile)
{
  m_CommandLineVars=sm_Statics.m_GlobalCommandLineVars;

  m_MakeDir=NullFileInfo;
  vector<string>::iterator ArgIt=Args.begin();
  while (ArgIt!=Args.end())
  {
    int EqPos=ArgIt->find('=');
    if (EqPos!=string::npos)
    {
      string Var=ArgIt->substr(0,EqPos);
      string Val=ArgIt->substr(EqPos+1);
      m_CommandLineVars[Var]=Val;
    }
    else if ((*ArgIt)[0]=='-')
    {
      switch ((*ArgIt)[1])
      {
        case 'f':
          if (ArgIt->size()>2)
          {
            if (!m_MakeDir)
            {
              m_Makefile=GetFileInfo(ArgIt->substr(2));
            }
            else
            {
              m_Makefile=GetFileInfo(ArgIt->substr(2),m_MakeDir);
            }
          }
          else
          {
            ArgIt++;
            if (!m_MakeDir)
            {
              m_Makefile=GetFileInfo(*ArgIt);
            }
            else
            {
              m_Makefile=GetFileInfo(*ArgIt,m_MakeDir);
            }
          }
          break;
        case 'C':
#ifdef _DEBUG
          if ((*ArgIt)[2]=='D')
          {
            g_CheckCircularDeps=true;
            break;
          }
#endif
          /* Fall through */
        case 'c':
          if (ArgIt->size()>2)
            m_MakeDir=GetFileInfo(ArgIt->substr(2));
          else
          {
            ArgIt++;
            m_MakeDir=GetFileInfo(*ArgIt);
          }
          break;
        case 'a':
          g_RebuildAll=true;
          break;
        case 'q':
          g_Quiet=true;
          break;
        case 's':
          g_ForceAutoDepRescan=true;
          break;
        case 'v':
          PrintVersionInfo();
          break;
#ifdef _DEBUG
        case 'p':
          g_PrintVarsAndRules=true;
          break;
        case 'n':
          g_DoNotExecute=true;
          break;
        case 'w':
          g_PrintAdditionalInfo=true;
          break;
        case 'd':
          g_pPrintDependencyCheck=true;
          break;
        case 'D':
          g_PrintMultipleDefinedRules=true;
          break;
        case 'l':
          g_PrintLexYacc=true;
          break;
        case 'e':
          g_DumpOnError=true;
          break;
        case 'm':
          g_BuildMd5Db=true;
          break;
        case 'b':
          g_GenProjectTree=true;
          break;
#endif
        default:
          cerr << "\nUnknown option: "<<*ArgIt<<endl<<endl;
          cerr << s_UsageString;
          throw(1);
      }
    }
    else
    {
      m_CommandLineTargets.push_back(*ArgIt);
    }
    ArgIt++;
  }
  if (!m_Makefile)
  {
    if (!Makefile.empty())
    {
      if (!m_MakeDir)
        m_Makefile=GetFileInfo(Makefile);
      else
        m_Makefile=GetFileInfo(Makefile,m_MakeDir);
    }
  }
  if (!m_Makefile)
  {
    if (!m_MakeDir)
      m_Makefile=GetFileInfo(m_CommandLineTargets[0]);
    else
      m_Makefile=GetFileInfo(m_CommandLineTargets[0],m_MakeDir);

    m_CommandLineTargets.erase(m_CommandLineTargets.begin());
  }
  if (!m_MakeDir)
  {
    if (Makefile==g_EmptyString)
      m_MakeDir=m_Makefile->GetDir(); /* This  is one from load_makefile, so we take the directory of the makefile itself. */
    else
      m_MakeDir=curdir::GetCurDir(); /* This means that this is the main makefile given on the command line, so we take the current directory */
  }

  if (loadedmakefile::sm_Statics.m_MhMakeConf)
  {
    const string &RootDir=loadedmakefile::sm_Statics.m_MhMakeConf->GetFullFileName();
    string MakeDir=m_MakeDir->GetFullFileName();
    if (RootDir.length()>MakeDir.length() || _strnicmp(RootDir.c_str(),MakeDir.c_str(),RootDir.length()))
    {
      cerr<<"mhmake needs to run in a directory that is a subdirectory of the directory specified with %MHMAKECONF : "<<RootDir<<", make dir : "<<m_MakeDir->GetFullFileName()<<endl;
      exit(1);
    }
  }
}

///////////////////////////////////////////////////////////////////////////////
void loadedmakefile::LoadMakefile()
{
  refptr<fileinfo> CurDir=curdir::GetCurDir();

  curdir::ChangeCurDir(m_MakeDir);

  #ifdef _DEBUG
  if (g_PrintAdditionalInfo)
    cout << "Loading makefile "<<m_Makefile->GetFullFileName()<<endl;
  #endif

  m_pParser=refptr<mhmakeparser>(new mhmakeparser(m_CommandLineVars));

  // Add the MAKECMDGOALS environment variable
  string MakeCmdGoals;
  bool First=true;
  vector<string>::iterator TarIt=m_CommandLineTargets.begin();
  while (TarIt!=m_CommandLineTargets.end())
  {
    if (First)
      First=false;
    else
      MakeCmdGoals+=g_SpaceString;
    MakeCmdGoals+=*TarIt;
    TarIt++;
  }
  m_pParser->SetVariable("MAKECMDGOALS",MakeCmdGoals);

  string BaseAutoMak;

  // First parse the makefile.before makefile which is in the directory $(MHMAKECONF) environment variable
  refptr<fileinfo> DepFile;
  if (sm_Statics.m_MhMakeConf)
  {
    BaseAutoMak=m_pParser->ExpandVar(BASEAUTOMAK);
    if (BaseAutoMak.empty())
    {
      BaseAutoMak="makefile";
      m_pParser->SetVariable(BASEAUTOMAK,BaseAutoMak);
    }
    refptr<fileinfo> BeforeMakefile=GetFileInfo(BaseAutoMak+".before",sm_Statics.m_MhMakeConf);

    int result=m_pParser->ParseFile(BeforeMakefile,true);
    if (result)
    {
      printf("Error parsing %s\n",BeforeMakefile->GetFullFileName().c_str());
      throw(1);
    }
    m_pParser->UpdateDate(BeforeMakefile->GetDate());

    // Now parse the automaticly generated dependency file, which needs to be in the objdir directory
    string ObjDirName=m_pParser->ExpandExpression("$(OBJDIR)");
    if (!ObjDirName.size())
    {
      printf("When making use of MHMAKECONF, you have to define OBJDIR in makefile.before");
      throw(1);
    }
    DepFile=GetFileInfo(ObjDirName+OSPATHSEPSTR MAKEDEPFILE);
    m_pParser->SetVariable(AUTODEPFILE,DepFile->GetFullFileName().c_str());
  }
  else
  {
    /* Create a file that is depending on the makefile name and the arguments */
    md5_context ctx;

    md5_starts( &ctx );

    map<string,string>::const_iterator pIt=m_CommandLineVars.begin();
    while (pIt!=m_CommandLineVars.end())
    {
      md5_update(&ctx, (uint8*)pIt->first.c_str(), pIt->first.size());
      md5_update(&ctx, (uint8*)pIt->second.c_str(), pIt->second.size());
      pIt++;
    }
    md5_update(&ctx, (uint8*)m_Makefile->GetFullFileName().c_str(), m_Makefile->GetFullFileName().size());

    char ID[10];
    sprintf(ID,"_%x",md5_finish32( &ctx));

    DepFile=GetFileInfo(string(MAKEDEPFILE)+ID);
    m_pParser->SetVariable(AUTODEPFILE,DepFile->GetFullFileName().c_str());
  }

  if (DepFile->Exists())
    m_pParser->LoadAutoDepsFile(DepFile); /* Already load this autodep file before parsing of the makefile to avoid needless rebuilds. */

  //m_pParser->yydebug=1;
  int result=m_pParser->ParseFile(m_Makefile,true);
  if (result)
  {
    printf("Error parsing %s\n",m_Makefile->GetFullFileName().c_str());
    throw(1);
  }
  #ifdef _DEBUG
  /* Check if the makefile has changed the AUTODEPFILE variable, if so generate a warning that a
   * rebuild could happen for the rules defined for making included makefiles */
  if (m_pParser->ExpandVar(AUTODEPFILE)!=DepFile->GetFullFileName())
  {
    cout << "\n\nWARNING:\n  makefile '"<< m_Makefile->GetFullFileName() <<"' re-defines AUTODEPFILE\n  from '"<< DepFile->GetFullFileName() <<"'\n  to '"<<
            m_pParser->ExpandVar(AUTODEPFILE) << "'\n  (may cause needless rebuilds when having rules for included makefiles!!!!!)\n\n\n";
  }

  if (g_PrintAdditionalInfo)
  {
    if (m_pParser->GetFirstTarget())
      cout<<"First target of "<<m_Makefile->GetFullFileName()<<" is "<<m_pParser->GetFirstTarget()->GetFullFileName()<<endl;
    else
      cout<<"No First target for "<<m_Makefile->GetFullFileName()<<endl;
  }
  #endif
  m_pParser->UpdateDate(m_Makefile->GetDate());

  if (sm_Statics.m_MhMakeConf)
  {
    refptr<fileinfo> AfterMakefile=GetFileInfo(BaseAutoMak+".after",sm_Statics.m_MhMakeConf);
    int result=m_pParser->ParseFile(AfterMakefile);
    if (result) {
      printf("Error parsing %s\n",AfterMakefile->GetFullFileName().c_str());
      throw(1);
    }
    m_pParser->UpdateDate(AfterMakefile->GetDate());
  }
  bool ForceAutoDepRescan=g_ForceAutoDepRescan;
  if (DepFile->Exists())
    m_pParser->LoadAutoDepsFile(DepFile);
  else
    ForceAutoDepRescan=true;
  if (ForceAutoDepRescan)
    m_pParser->EnableAutoDepRescan();

  vector<string> &MakefilesToLoad=m_pParser->GetMakefilesToLoad();
  vector<string>::iterator It=MakefilesToLoad.begin();
  while (It!=MakefilesToLoad.end())
  {
    // First split the command into arguments
    const char *pTmp=It->c_str();
    vector<string> Args;
    while (*pTmp)
    {
      string Item;
      pTmp=NextItem(pTmp,Item);
      Args.push_back(Item);
    }

    refptr<loadedmakefile> pLoadedMakefile(new loadedmakefile(Args));
    refptr<loadedmakefile> Found=g_LoadedMakefiles.find(*pLoadedMakefile);
    if (Found)
    {
      #ifdef _DEBUG
      if (g_PrintAdditionalInfo)
        cout << "Makefile already loaded: "<<Found->m_Makefile->GetFullFileName()<<endl;
      #endif
    }
    else
    {
      g_LoadedMakefiles.push_back(pLoadedMakefile);

        /* If there is a rule to build the makefile, first check if it needs to be rebuild */
      m_pParser->BuildTarget(pLoadedMakefile->m_Makefile);
      pLoadedMakefile->LoadMakefile();
    }
    It++;
  }
  curdir::ChangeCurDir(CurDir);

  if (m_pParser->CompareEnv())
  {
    #ifdef _DEBUG
    if (!g_GenProjectTree)
      cout << "Rebuilding everything of "<< m_Makefile->GetFullFileName() <<" because environment and/or command-line variables have been changed.\n";
    #endif
    m_pParser->SetRebuildAll();
  }

}

#ifdef _DEBUG
///////////////////////////////////////////////////////////////////////////////
void DumpVarsAndRules()
{
  int i;
  LOADEDMAKEFILES::iterator LoadMakIt=g_LoadedMakefiles.begin();
  while (LoadMakIt!=g_LoadedMakefiles.end())
  {
    for (i=0; i<80; i++) cout << "_";
    cout << endl;
    cout << "Variables of makefile " << (*LoadMakIt)->m_Makefile->GetFullFileName() << endl;
    for (i=0; i<80; i++) cout << "_";
    cout << endl;
    (*LoadMakIt)->m_pParser->PrintVariables(true);
    cout << endl;
    LoadMakIt++;
  }
  for (i=0; i<80; i++) cout << "_";
  cout << endl;
  cout << "All Rules\n";
  for (i=0; i<80; i++) cout << "_";
  cout << endl;
  PrintFileInfos();
  for (i=0; i<80; i++) cout << "_";
  cout << endl;
  cout << "All Implicit Rules\n";
  for (i=0; i<80; i++) cout << "_";
  cout << endl;
  IMPLICITRULE::PrintImplicitRules();
}
#endif