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

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


  Copyright (c) 2000 National Library of Medicine
  All rights reserved.

  See COPYRIGHT.txt for copyright details.

=========================================================================*/
#include "cmUnixMakefileGenerator.h"
#include "cmMakefile.h"
#include "cmStandardIncludes.h"
#include "cmSystemTools.h"
#include "cmSourceFile.h"
#include "cmMakeDepend.h"
#include "cmCacheManager.h"

void cmUnixMakefileGenerator::GenerateMakefile()
{
  // Generate depends 
  cmMakeDepend md;
  md.SetMakefile(m_Makefile);
  md.DoDepends();
  // output the makefile fragment
  this->OutputMakefile("CMakeTargets.make"); 
}


// This is where CMakeTargets.make is generated
void cmUnixMakefileGenerator::OutputMakefile(const char* file)
{
  // Create sub directories fro aux source directories
  std::vector<std::string>& auxSourceDirs = 
    m_Makefile->GetAuxSourceDirectories();
  if( auxSourceDirs.size() )
    {
    // For the case when this is running as a remote build
    // on unix, make the directory
    for(std::vector<std::string>::iterator i = auxSourceDirs.begin();
        i != auxSourceDirs.end(); ++i)
      {
      cmSystemTools::MakeDirectory(i->c_str());
      }
    }
  std::ofstream fout(file);
  if(!fout)
    {
    cmSystemTools::Error("Error can not open for write: ", file);
    return;
    }
  this->OutputMakeFlags(fout);
  this->OutputVerbatim(fout);
  this->OutputTargetRules(fout);
  this->OutputDependencies(fout);
  this->OutputTargets(fout);
  this->OutputSubDirectoryRules(fout);
  this->OutputObjectDepends(fout);
  this->OutputCustomRules(fout);
}

// Output the rules for any targets
void cmUnixMakefileGenerator::OutputTargetRules(std::ostream& fout)
{
  // for each target add to the list of targets
  fout << "TARGETS = ";
  const cmTargets &tgts = m_Makefile->GetTargets();
  // libraries
  for(cmTargets::const_iterator l = tgts.begin(); 
      l != tgts.end(); l++)
    {
    if (l->second.IsALibrary())
      {
      fout << " \\\nlib" << l->first.c_str() << "${CMAKE_LIB_EXT}";
      }
    }
  // executables
  for(cmTargets::const_iterator l = tgts.begin(); 
      l != tgts.end(); l++)
    {
    if (!l->second.IsALibrary())
      {
      fout << "\\\n" << l->first.c_str();
      }
    }
  fout << "\n\n";
  
  // get the classes from the source lists then add them to the groups
  for(cmTargets::const_iterator l = tgts.begin(); 
      l != tgts.end(); l++)
    {
    std::vector<cmSourceFile> classes = l->second.GetSourceFiles();
    fout << l->first << "_SRC_OBJS = ";
    for(std::vector<cmSourceFile>::iterator i = classes.begin(); 
        i != classes.end(); i++)
      {
      if(!i->IsAHeaderFileOnly())
        {
        fout << "\\\n" << i->GetSourceName() << ".o ";
        }
      }
    fout << "\n\n";
    }
}


/**
 * Output the linking rules on a command line.  For executables,
 * targetLibrary should be a NULL pointer.  For libraries, it should point
 * to the name of the library.  This will not link a library against itself.
 */
void cmUnixMakefileGenerator::OutputLinkLibraries(std::ostream& fout,
                                                  const char* targetLibrary)
{
  // collect all the flags needed for linking libraries
  std::string linkLibs;        
  std::vector<std::string>::iterator j;
  std::vector<std::string>& libdirs = m_Makefile->GetLinkDirectories();
  for(j = libdirs.begin(); j != libdirs.end(); ++j)
    { 
    std::string::size_type pos = (*j).find("-L");
    if((pos == std::string::npos || pos > 0)
       && (*j).find("${") == std::string::npos)
      {
      linkLibs += "-L";
      }
    linkLibs += *j;
    linkLibs += " ";
    }
  std::string librariesLinked;
  std::vector<std::string>& libs = m_Makefile->GetLinkLibraries();
  for(j = libs.begin(); j != libs.end(); ++j)
    {
    // Don't link the library against itself!
    if(targetLibrary && (*j == targetLibrary)) continue;
    std::string::size_type pos = (*j).find("-l");
    if((pos == std::string::npos || pos > 0)
       && (*j).find("${") == std::string::npos)
      {
      librariesLinked += "-l";
      }
    librariesLinked += *j;
    librariesLinked += " ";
    }
  linkLibs += librariesLinked;

  if(!targetLibrary)
    {
    // For executables, add these a second time so order does not matter
    linkLibs += librariesLinked;
    }
  linkLibs += " ${LOCAL_LINK_FLAGS} ";
  fout << linkLibs;
}


void cmUnixMakefileGenerator::OutputTargets(std::ostream& fout)
{
  // for each target
  const cmTargets &tgts = m_Makefile->GetTargets();
  for(cmTargets::const_iterator l = tgts.begin(); 
      l != tgts.end(); l++)
    {
    if (l->second.IsALibrary())
      {
      fout << "#---------------------------------------------------------\n";
      fout << "# rules for a library\n";
      fout << "#\n";
      fout << "lib" << l->first << ".a: ${KIT_OBJ} ${" << 
        l->first << "_SRC_OBJS} \n";
      fout << "\t${AR} cr lib" << l->first << ".a ${KIT_OBJ} ${" << 
        l->first << "_SRC_OBJS} \n";
      fout << "\t${RANLIB} lib" << l->first << ".a\n";
      fout << std::endl;

      fout << "lib" << l->first << "$(SHLIB_SUFFIX): ${KIT_OBJ} ${" << 
        l->first << "_SRC_OBJS} \n";
      fout << "\trm -f lib" << l->first << "$(SHLIB_SUFFIX)\n";
      fout << "\t$(CXX) ${CXX_FLAGS} ${CMAKE_SHLIB_BUILD_FLAGS} -o \\\n";
      fout << "\t  lib" << l->first << "$(SHLIB_SUFFIX) \\\n";
      fout << "\t  ${KIT_OBJ} ${" << l->first << 
        "_SRC_OBJS} ";
      this->OutputLinkLibraries(fout, l->first.c_str());
      fout << "\n\n";
      }
    else
      {
      fout << l->first << ": ${" << 
        l->first << "_SRC_OBJS} ${CMAKE_DEPEND_LIBS}\n";
      fout << "\t${CXX}  ${CXX_FLAGS} ${" << 
        l->first << "_SRC_OBJS} ";
      this->OutputLinkLibraries(fout, NULL);
      fout << " -o " << l->first << "\n\n";
      }
    }
}


// output the list of libraries that the executables 
// in this makefile will depend on.
void cmUnixMakefileGenerator::OutputDependencies(std::ostream& fout)
{
  fout << "CMAKE_DEPEND_LIBS = ";
  std::vector<std::string>& libs = m_Makefile->GetLinkLibraries();
  std::vector<std::string>::iterator dir, lib;
  // Search the list of libraries that will be linked into
  // the executable
  for(lib = libs.begin(); lib != libs.end(); ++lib)
    {
    // loop over the list of directories that the libraries might
    // be in, looking for an ADD_LIBRARY(lib...) line. This would
    // be stored in the cache
    const char* cacheValue
      = cmCacheManager::GetInstance()->GetCacheValue(lib->c_str());
    if(cacheValue)
      {
      std::string libpath = cacheValue;
      libpath += "/lib";
      libpath += *lib;
      libpath += "${CMAKE_LIB_EXT}";
      fout << libpath << " ";
      }
    }

  std::vector<std::string>& utils = m_Makefile->GetUtilities();
  std::vector<std::string>& utildirs = m_Makefile->GetUtilityDirectories();
  std::vector<std::string>::iterator util;
  // Search the list of utilities that may be used to generate code for
  // this project.
  for(util = utils.begin(); util != utils.end(); ++util)
    {
    bool found = false;
    // loop over the list of directories that the utilities might
    // be in, looking for an ADD_EXECUTABLE(util ...) line.
    for(dir = utildirs.begin(); dir != utildirs.end() && !found; ++dir)
      {
      std::string expression = "TARGETS =.*";
      expression += util->c_str();
      if(cmSystemTools::Grep(dir->c_str(), "CMakeTargets.make",
                             expression.c_str()))
        {
        fout << *util << " ";
        found = true;
        }
      }
    }
  fout << "\n";
}


// output make include flags
void cmUnixMakefileGenerator::OutputMakeFlags(std::ostream& fout)
{
  // Output Include paths
  fout << "INCLUDE_FLAGS = ";
  std::vector<std::string>& includes = m_Makefile->GetIncludeDirectories();
  std::vector<std::string>::iterator i;
  fout << "-I" << m_Makefile->GetStartDirectory() << " ";
  for(i = includes.begin(); i != includes.end(); ++i)
    {
    std::string include = *i;
    fout << "-I" << i->c_str() << " ";
    }
  fout << m_Makefile->GetDefineFlags();
  fout << " ${LOCAL_INCLUDE_FLAGS} ";
  fout << "\n\n";
  fout << "default_target: all\n\n";
  // see if there are files to compile in this makefile
  // These are used for both libraries and executables
}

// output verbatim section
void cmUnixMakefileGenerator::OutputVerbatim(std::ostream& fout)
{
    std::vector<std::string>& MakeVerbatim = m_Makefile->GetMakeVerbatim();
  // Ouput user make text embeded in the input file
  for(unsigned int i =0; i < MakeVerbatim.size(); i++)
    {
    fout << MakeVerbatim[i] << "\n";
    }
  fout << "\n\n";
  
}

// fix up names of directories so they can be used
// as targets in makefiles.
inline std::string FixDirectoryName(const char* dir)
{
  std::string s = dir;
  // replace ../ with 3 under bars
  size_t pos = s.find("../");
  if(pos != std::string::npos)
    {
    s.replace(pos, 3, "___");
    }
  // replace / directory separators with a single under bar 
  pos = s.find("/");
  while(pos != std::string::npos)
    {
    s.replace(pos, 1, "_");
    pos = s.find("/");
    }
  return s;
}


// output rules for decending into sub directories
void cmUnixMakefileGenerator::OutputSubDirectoryRules(std::ostream& fout)
{
    // Output Sub directory build rules
  const std::vector<std::string>& SubDirectories
    = m_Makefile->GetSubDirectories();
    
  if( SubDirectories.size() == 0)
    {
    return;
    }
  fout << "SUBDIR_BUILD = \\\n";
  unsigned int i;
  for(i =0; i < SubDirectories.size(); i++)
    { 
    std::string subdir = FixDirectoryName(SubDirectories[i].c_str());
    fout << "build_" << subdir.c_str();
    if(i == SubDirectories.size()-1)
      {
      fout << " \n\n";
      }
    else
      {
      fout << " \\\n";
      }
    }
  fout << std::endl;
  fout << "SUBDIR_CLEAN = \\\n";
  for(i =0; i < SubDirectories.size(); i++)
    { 
    std::string subdir = FixDirectoryName(SubDirectories[i].c_str());
    fout << "clean_" << subdir.c_str();
    if(i == SubDirectories.size()-1)
      {
      fout << " \n\n";
      }
    else
      {
      fout << " \\\n";
      }
    }
  fout << std::endl;
  fout << "alldirs : ${SUBDIR_BUILD}\n\n";

  for(i =0; i < SubDirectories.size(); i++)
    {
    std::string subdir = FixDirectoryName(SubDirectories[i].c_str());
    fout << "build_" << subdir.c_str() << ":\n";
    fout << "\tcd " << SubDirectories[i].c_str()
         << "; ${MAKE} -${MAKEFLAGS} CMakeTargets.make\n";
    fout << "\tcd " << SubDirectories[i].c_str()
         << "; ${MAKE} -${MAKEFLAGS} all\n\n";

    fout << "clean_" << subdir.c_str() << ": \n";
    fout << "\tcd " << SubDirectories[i].c_str() 
         << "; ${MAKE} -${MAKEFLAGS} clean\n\n";
    }
}




// Output the depend information for all the classes 
// in the makefile.  These would have been generated
// by the class cmMakeDepend GenerateMakefile
void cmUnixMakefileGenerator::OutputObjectDepends(std::ostream& fout)
{
  // Iterate over every target.
  std::map<std::string, cmTarget>& targets = m_Makefile->GetTargets();
  for(std::map<std::string, cmTarget>::const_iterator target = targets.begin(); 
      target != targets.end(); ++target)
    {
    // Iterate over every source for this target.
    const std::vector<cmSourceFile>& sources = target->second.GetSourceFiles();
    for(std::vector<cmSourceFile>::const_iterator source = sources.begin(); 
        source != sources.end(); ++source)
      {
      if(!source->IsAHeaderFileOnly())
        {
        if(!source->GetDepends().empty())
          {
          fout << source->GetSourceName() << ".o :";
          // Iterate through all the dependencies for this source.
          for(std::vector<std::string>::const_iterator dep =
                source->GetDepends().begin();
              dep != source->GetDepends().end(); ++dep)
            {
            fout << " \\\n" << dep->c_str();
            }
          fout << "\n\n";
          }
        }
      }
    }
}


// Output each custom rule in the following format:
// output: source depends...
//   (tab)   command...
void cmUnixMakefileGenerator::OutputCustomRules(std::ostream& fout)
{
  // We may be modifying the source groups temporarily, so make a copy.
  std::vector<cmSourceGroup> sourceGroups = m_Makefile->GetSourceGroups();
  
  const cmTargets &tgts = m_Makefile->GetTargets();
  for(cmTargets::const_iterator tgt = tgts.begin(); 
      tgt != tgts.end(); ++tgt)
    {
    // add any custom rules to the source groups
    for (std::vector<cmCustomCommand>::const_iterator cr = 
           tgt->second.GetCustomCommands().begin(); 
         cr != tgt->second.GetCustomCommands().end(); ++cr)
      {
      cmSourceGroup& sourceGroup = 
        m_Makefile->FindSourceGroup(cr->GetSourceName().c_str(),
                                    sourceGroups);
      cmCustomCommand cc(*cr);
      cc.ExpandVariables(*m_Makefile);
      sourceGroup.AddCustomCommand(cc);
      }
    }
  
  // Loop through every source group.
  for(std::vector<cmSourceGroup>::const_iterator sg =
        sourceGroups.begin(); sg != sourceGroups.end(); ++sg)
    {
    const cmSourceGroup::CustomCommands& customCommands = 
      sg->GetCustomCommands();
    if(customCommands.empty())
      { continue; }
    
    std::string name = sg->GetName();
    if(name != "")
      {
      fout << "# Start of source group \"" << name.c_str() << "\"\n";
      }
    
    // Loop through each source in the source group.
    for(cmSourceGroup::CustomCommands::const_iterator cc =
          customCommands.begin(); cc != customCommands.end(); ++ cc)
      {
      std::string source = cc->first;
      const cmSourceGroup::Commands& commands = cc->second;
      // Loop through every command generating code from the current source.
      for(cmSourceGroup::Commands::const_iterator c = commands.begin();
          c != commands.end(); ++c)
        {
        std::string command = c->first;
        const cmSourceGroup::CommandFiles& commandFiles = c->second;
        // Write a rule for every output generated by this command.
        for(std::set<std::string>::const_iterator output =
              commandFiles.m_Outputs.begin();
            output != commandFiles.m_Outputs.end(); ++output)
          {
          std::string src = cmSystemTools::EscapeSpaces(source.c_str());
          fout << output->c_str() << ": " << src.c_str();
          // Write out all the dependencies for this rule.
          for(std::set<std::string>::const_iterator d =
                commandFiles.m_Depends.begin();
              d != commandFiles.m_Depends.end(); ++d)
            {
            std::string dep = cmSystemTools::EscapeSpaces(d->c_str());
            fout << " " << dep.c_str();
            }
          fout << "\n\t" << command.c_str() << "\n\n";
          }
        }
      }
    if(name != "")
      {
      fout << "# End of source group \"" << name.c_str() << "\"\n\n";
      }
    }  
}