/*=========================================================================

  Program:   Insight Segmentation & Registration Toolkit
  Module:    $RCSfile$
  Language:  C++
  Date:      $Date$
  Version:   $Revision$

  Copyright (c) 2002 Insight Consortium. All rights reserved.
  See ITKCopyright.txt or http://www.itk.org/HTML/Copyright.htm for details.

     This software is distributed WITHOUT ANY WARRANTY; without even 
     the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR 
     PURPOSE.  See the above copyright notices for more information.

=========================================================================*/
#include "cmVTKWrapPythonCommand.h"

// cmVTKWrapPythonCommand
bool cmVTKWrapPythonCommand::InitialPass(std::vector<std::string> const& argsIn)
{
  if(argsIn.size() < 3 )
    {
    this->SetError("called with incorrect number of arguments");
    return false;
    }
  std::vector<std::string> args;
  cmSystemTools::ExpandListArguments(argsIn, args);

  // Now check and see if the value has been stored in the cache
  // already, if so use that value and don't look for the program
  if(!m_Makefile->IsOn("VTK_WRAP_PYTHON"))
    {
    return true;
    }

  
  // what is the current source dir
  std::string cdir = m_Makefile->GetCurrentDirectory();

  // keep the library name
  m_LibraryName = args[0];
  m_SourceList = args[1];
  
  // get the list of classes for this library
  cmMakefile::SourceMap &Classes = m_Makefile->GetSources();
  for(std::vector<std::string>::const_iterator j = (args.begin() + 2);
      j != args.end(); ++j)
    {   
    cmMakefile::SourceMap::iterator l = Classes.find(*j);
    if (l == Classes.end())
      {
      this->SetError("bad source list passed to VTKWrapPythonCommand");
      return false;
      }
    for(std::vector<cmSourceFile*>::iterator i = l->second.begin(); 
        i != l->second.end(); i++)
      {
      cmSourceFile &curr = *(*i);
      // if we should wrap the class
      if (!curr.GetWrapExclude())
        {
        cmSourceFile file;
        file.SetIsAnAbstractClass(curr.IsAnAbstractClass());
        std::string newName = curr.GetSourceName() + "Python";
        file.SetName(newName.c_str(), m_Makefile->GetCurrentOutputDirectory(),
                     "cxx",false);
        std::string hname = cdir + "/" + curr.GetSourceName() + ".h";
        m_WrapHeaders.push_back(hname);
        // add starting depends
        file.GetDepends().push_back(hname);
        m_WrapClasses.push_back(file);
        }
      }
    }
  
  return true;
}

void cmVTKWrapPythonCommand::FinalPass() 
{
  // first we add the rules for all the .h to Python.cxx files
  size_t lastClass = m_WrapClasses.size();
  std::vector<std::string> depends;
  std::string wpython = "${VTK_WRAP_PYTHON_EXE}";
  std::string hints = "${VTK_WRAP_HINTS}";

  m_Makefile->ExpandVariablesInString(hints);
  
  // Create the init file 
  std::string res = m_LibraryName;
  res += "Init.cxx";
  this->CreateInitFile(res);
  
  // add the init file
  cmSourceFile cfile;
  cfile.SetIsAnAbstractClass(false);
  std::string newName = m_LibraryName;
  newName += "Init";
  cfile.SetName(newName.c_str(), m_Makefile->GetCurrentOutputDirectory(),
                "cxx",false);
  m_Makefile->AddSource(cfile,m_SourceList.c_str());
  
  // wrap all the .h files
  depends.push_back(wpython);
  if (strcmp("${VTK_WRAP_HINTS}",hints.c_str()))
    {
    depends.push_back(hints);
    }
  for(size_t classNum = 0; classNum < lastClass; classNum++)
    {
    m_Makefile->AddSource(m_WrapClasses[classNum],m_SourceList.c_str());
    std::string res = m_Makefile->GetCurrentOutputDirectory();
    res += "/";
    res += m_WrapClasses[classNum].GetSourceName() + ".cxx";
    std::vector<std::string> args;
    args.push_back(m_WrapHeaders[classNum]);
    if (strcmp("${VTK_WRAP_HINTS}",hints.c_str()))
      {
      args.push_back(hints);
      }
    args.push_back((m_WrapClasses[classNum].IsAnAbstractClass() ? "0" : "1"));
    args.push_back(res);
    m_Makefile->AddCustomCommand(m_WrapHeaders[classNum].c_str(),
                                 wpython.c_str(), args, depends, 
                                 res.c_str(), m_LibraryName.c_str());
    }
  
}

bool cmVTKWrapPythonCommand::CreateInitFile(std::string& res) 
{
  std::vector<std::string> classes;
  size_t lastClass = m_WrapHeaders.size();
  size_t classNum;
  for(classNum = 0; classNum < lastClass; classNum++)
    {
    std::string cls = m_WrapHeaders[classNum];
    cls = cls.substr(0,cls.size()-2);
    std::string::size_type pos = cls.rfind('/');    
    if(pos != std::string::npos)
      {
      cls = cls.substr(pos+1);
      }
    classes.push_back(cls);
    }
  
  // open the init file
  std::string outFileName = 
    m_Makefile->GetCurrentOutputDirectory();
  outFileName += "/" + res;
  
  return this->WriteInit(m_LibraryName.c_str(), outFileName, classes);
}


/* warning this code is also in getclasses.cxx under pcmaker */
bool cmVTKWrapPythonCommand::WriteInit(const char *kitName, 
                                       std::string& outFileName,
                                       std::vector<std::string>& classes)
{
  unsigned int i;
  
  std::string tempOutputFile = outFileName + ".tmp";
  FILE *fout = fopen(tempOutputFile.c_str(),"w");
  if (!fout)
    {
    return false;
    }
  
  fprintf(fout,"#include <string.h>\n");
  fprintf(fout,"#include \"Python.h\"\n\n");

  for (i = 0; i < classes.size(); i++)
    {
#ifdef _WIN32
    fprintf(fout,"extern  \"C\" {__declspec( dllexport) PyObject *PyVTKClass_%sNew(char *); }\n",classes[i].c_str());
#else
    fprintf(fout,"extern  \"C\" {PyObject *PyVTKClass_%sNew(char *); }\n",classes[i].c_str());
#endif
    }

  fprintf(fout,"\nstatic PyMethodDef Py%s_ClassMethods[] = {\n",
	  kitName);
  fprintf(fout,"{NULL, NULL}};\n\n");
  
#ifdef _WIN32
  fprintf(fout,"extern  \"C\" {__declspec( dllexport) void init%s();}\n\n",kitName);
  fprintf(fout,"void init%s()\n{\n",kitName);
#else
  fprintf(fout,"extern  \"C\" {void initlib%s();}\n\n",kitName);
  fprintf(fout,"void initlib%s()\n{\n",kitName);
#endif
  

  /* module init function */
  fprintf(fout,"  PyObject *m, *d, *c;\n\n");
#ifdef _WIN32
  fprintf(fout,"  static char modulename[] = \"%s\";\n",kitName);
#else
  fprintf(fout,"  static char modulename[] = \"lib%s\";\n",kitName);
#endif
  fprintf(fout,"  m = Py_InitModule(modulename, Py%s_ClassMethods);\n",
	  kitName);
  
  fprintf(fout,"  d = PyModule_GetDict(m);\n");
  fprintf(fout,"  if (!d) Py_FatalError(\"can't get dictionary for module %s!\");\n\n",
	  kitName);

  for (i = 0; i < classes.size(); i++)
    {
    fprintf(fout,"  if ((c = PyVTKClass_%sNew(modulename)))\n",
            classes[i].c_str());
    fprintf(fout,"    if (-1 == PyDict_SetItemString(d, \"%s\", c))\n",
	    classes[i].c_str());
    fprintf(fout,"      Py_FatalError(\"can't add class %s to dictionary!\");\n\n",
	    classes[i].c_str());
    }
  fprintf(fout,"}\n\n");
  fclose(fout);
  
  
  // copy the file if different
  cmSystemTools::CopyFileIfDifferent(tempOutputFile.c_str(),
                                     outFileName.c_str());
  cmSystemTools::RemoveFile(tempOutputFile.c_str());
  return true;
}