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

  Program:   CMake - Cross-Platform Makefile Generator
  Module:    $RCSfile$
  Language:  C++
  Date:      $Date$
  Version:   $Revision$

  Copyright (c) 2002 Kitware, Inc., Insight Consortium.  All rights reserved.
  See Copyright.txt or http://www.cmake.org/HTML/Copyright.html 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 "cmMakefileLibraryTargetGenerator.h"

#include "cmGeneratedFileStream.h"
#include "cmGlobalGenerator.h"
#include "cmLocalUnixMakefileGenerator3.h"
#include "cmMakefile.h"
#include "cmSourceFile.h"
#include "cmTarget.h"

//----------------------------------------------------------------------------
void cmMakefileLibraryTargetGenerator::WriteRuleFiles()
{
  // create the build.make file and directory, put in the common blocks
  this->CreateRuleFile();
  
  // Add in any rules for custom commands
  this->WriteCustomCommandsForTarget();

  // write in rules for object files
  this->WriteCommonCodeRules();
  
  // Write the dependency generation rule.
  this->WriteTargetDependRules();

  // write the link rules
  // Write the rule for this target type.
  switch(this->Target->GetType())
    {
    case cmTarget::STATIC_LIBRARY:
      this->WriteStaticLibraryRules();
      break;
    case cmTarget::SHARED_LIBRARY:
      this->WriteSharedLibraryRules(false);
      if(this->Target->NeedRelinkBeforeInstall())
        {
        // Write rules to link an installable version of the target.
        this->WriteSharedLibraryRules(true);
        }
      break;
    case cmTarget::MODULE_LIBRARY:
      this->WriteModuleLibraryRules(false);
      if(this->Target->NeedRelinkBeforeInstall())
        {
        // Write rules to link an installable version of the target.
        this->WriteModuleLibraryRules(true);
        }
      break;
    default:
      // If language is not known, this is an error.
      cmSystemTools::Error("Unknown Library Type");
      break;
    }

  // Write the requires target.
  this->WriteTargetRequiresRules();

  // Write clean target
  this->WriteTargetCleanRules();

  // close the streams
  this->CloseFileStreams();
}


//----------------------------------------------------------------------------
void cmMakefileLibraryTargetGenerator::WriteStaticLibraryRules()
{
  const char* linkLanguage =
    this->Target->GetLinkerLanguage(this->GlobalGenerator);
  std::string linkRuleVar = "CMAKE_";
  if (linkLanguage)
    {
    linkRuleVar += linkLanguage;
    }
  linkRuleVar += "_CREATE_STATIC_LIBRARY";

  std::string extraFlags;
  this->LocalGenerator->AppendFlags(extraFlags, this->Target->GetProperty("STATIC_LIBRARY_FLAGS"));
  this->WriteLibraryRules(linkRuleVar.c_str(), extraFlags.c_str(), false);
}

//----------------------------------------------------------------------------
void cmMakefileLibraryTargetGenerator::WriteSharedLibraryRules(bool relink)
{
  const char* linkLanguage =
    this->Target->GetLinkerLanguage(this->GlobalGenerator);
  std::string linkRuleVar = "CMAKE_";
  if (linkLanguage)
    {
    linkRuleVar += linkLanguage;
    }
  linkRuleVar += "_CREATE_SHARED_LIBRARY";

  std::string extraFlags;
  this->LocalGenerator->AppendFlags(extraFlags, this->Target->GetProperty("LINK_FLAGS"));
  this->LocalGenerator->AddConfigVariableFlags(extraFlags, "CMAKE_SHARED_LINKER_FLAGS");
  if(this->Makefile->IsOn("WIN32") && !(this->Makefile->IsOn("CYGWIN") || this->Makefile->IsOn("MINGW")))
    {
    const std::vector<cmSourceFile*>& sources = this->Target->GetSourceFiles();
    for(std::vector<cmSourceFile*>::const_iterator i = sources.begin();
        i != sources.end(); ++i)
      {
      if((*i)->GetSourceExtension() == "def")
        {
        extraFlags += " ";
        extraFlags += this->Makefile->GetSafeDefinition("CMAKE_LINK_DEF_FILE_FLAG");
        extraFlags += 
          this->Convert((*i)->GetFullPath().c_str(),cmLocalGenerator::START_OUTPUT,cmLocalGenerator::MAKEFILE);
        }
      }
    }
  this->WriteLibraryRules(linkRuleVar.c_str(), extraFlags.c_str(), relink);
}

//----------------------------------------------------------------------------
void cmMakefileLibraryTargetGenerator::WriteModuleLibraryRules(bool relink)
{
  const char* linkLanguage =
    this->Target->GetLinkerLanguage(this->GlobalGenerator);
  std::string linkRuleVar = "CMAKE_";
  if (linkLanguage)
    {
    linkRuleVar += linkLanguage;
    }
  linkRuleVar += "_CREATE_SHARED_MODULE";

  std::string extraFlags;
  this->LocalGenerator->AppendFlags(extraFlags, this->Target->GetProperty("LINK_FLAGS"));
  this->LocalGenerator->AddConfigVariableFlags(extraFlags, "CMAKE_MODULE_LINKER_FLAGS");
  // TODO: .def files should be supported here also.
  this->WriteLibraryRules(linkRuleVar.c_str(), extraFlags.c_str(), relink);
}

//----------------------------------------------------------------------------
void cmMakefileLibraryTargetGenerator::WriteLibraryRules
(const char* linkRuleVar, const char* extraFlags, bool relink)
{
  // TODO: Merge the methods that call this method to avoid
  // code duplication.
  std::vector<std::string> commands;

  std::string relPath = this->LocalGenerator->GetHomeRelativeOutputPath();
  std::string objTarget;

  // Build list of dependencies.
  std::vector<std::string> depends;
  for(std::vector<std::string>::const_iterator obj = this->Objects.begin();
      obj != this->Objects.end(); ++obj)
    {
    objTarget = relPath;
    objTarget += *obj;
    depends.push_back(objTarget);
    }

  // Add dependencies on targets that must be built first.
  this->AppendTargetDepends(depends);

  // Add a dependency on the rule file itself.
  this->LocalGenerator->AppendRuleDepend(depends, 
                                         this->BuildFileNameFull.c_str());
  
  for(std::vector<std::string>::const_iterator obj 
        = this->ExternalObjects.begin();
      obj != this->ExternalObjects.end(); ++obj)
    {
    depends.push_back(*obj);
    }
  
  // Get the language to use for linking this library.
  const char* linkLanguage =
    this->Target->GetLinkerLanguage(this->GlobalGenerator);

  // Make sure we have a link language.
  if(!linkLanguage)
    {
    cmSystemTools::Error("Cannot determine link language for target \"",
                         this->Target->GetName(), "\".");
    return;
    }

  // Create set of linking flags.
  std::string linkFlags;
  this->LocalGenerator->AppendFlags(linkFlags, extraFlags);

  // Construct the name of the library.
  std::string targetName;
  std::string targetNameSO;
  std::string targetNameReal;
  this->Target->GetLibraryNames(targetName, targetNameSO, targetNameReal,
                                this->LocalGenerator->m_ConfigurationName.c_str());

  // Construct the full path version of the names.
  std::string outpath = this->LocalGenerator->m_LibraryOutputPath;
  if(outpath.length() == 0)
    {
    outpath = this->Makefile->GetStartOutputDirectory();
    outpath += "/";
    }
  if(relink)
    {
    outpath = this->Makefile->GetStartOutputDirectory();
    outpath += "/CMakeFiles/CMakeRelink.dir";
    cmSystemTools::MakeDirectory(outpath.c_str());
    outpath += "/";
    }
  std::string targetFullPath = outpath + targetName;
  std::string targetFullPathSO = outpath + targetNameSO;
  std::string targetFullPathReal = outpath + targetNameReal;

  // Construct the output path version of the names for use in command
  // arguments.
  std::string targetOutPath = 
    this->Convert(targetFullPath.c_str(),cmLocalGenerator::START_OUTPUT,
                  cmLocalGenerator::MAKEFILE);
  std::string targetOutPathSO = 
    this->Convert(targetFullPathSO.c_str(),cmLocalGenerator::START_OUTPUT,
                  cmLocalGenerator::MAKEFILE);
  std::string targetOutPathReal = 
    this->Convert(targetFullPathReal.c_str(),cmLocalGenerator::START_OUTPUT,
                  cmLocalGenerator::MAKEFILE);

  // Add the link message.
  std::string buildEcho = "Linking ";
  buildEcho += linkLanguage;
  switch(this->Target->GetType())
    {
    case cmTarget::STATIC_LIBRARY:
      buildEcho += " static library "; break;
    case cmTarget::SHARED_LIBRARY:
      buildEcho += " shared library "; break;
    case cmTarget::MODULE_LIBRARY:
      buildEcho += " shared module "; break;
    default:
      buildEcho += " library "; break;
    }
  buildEcho += targetOutPath.c_str();
  this->LocalGenerator->AppendEcho(commands, buildEcho.c_str());

  // Construct a list of files associated with this library that may
  // need to be cleaned.
  std::vector<std::string> libCleanFiles;
  {
  std::string cleanStaticName;
  std::string cleanSharedName;
  std::string cleanSharedSOName;
  std::string cleanSharedRealName;
  this->Target->GetLibraryCleanNames(cleanStaticName,
                              cleanSharedName,
                              cleanSharedSOName,
                              cleanSharedRealName,
                              this->LocalGenerator->m_ConfigurationName.c_str());
  std::string cleanFullStaticName = outpath + cleanStaticName;
  std::string cleanFullSharedName = outpath + cleanSharedName;
  std::string cleanFullSharedSOName = outpath + cleanSharedSOName;
  std::string cleanFullSharedRealName = outpath + cleanSharedRealName;
  libCleanFiles.push_back
    (this->Convert(cleanFullStaticName.c_str(),cmLocalGenerator::START_OUTPUT,
                   cmLocalGenerator::MAKEFILE));
  if(cleanSharedRealName != cleanStaticName)
    {
    libCleanFiles.push_back(this->Convert(cleanFullSharedRealName.c_str(),
                                          cmLocalGenerator::START_OUTPUT,
                                          cmLocalGenerator::MAKEFILE));
    }
  if(cleanSharedSOName != cleanStaticName &&
     cleanSharedSOName != cleanSharedRealName)
    {
    libCleanFiles.push_back(this->Convert(cleanFullSharedSOName.c_str(),
                                          cmLocalGenerator::START_OUTPUT,
                                          cmLocalGenerator::MAKEFILE));
    }
  if(cleanSharedName != cleanStaticName &&
     cleanSharedName != cleanSharedSOName &&
     cleanSharedName != cleanSharedRealName)
    {
    libCleanFiles.push_back(this->Convert(cleanFullSharedName.c_str(),
                                          cmLocalGenerator::START_OUTPUT,
                                          cmLocalGenerator::MAKEFILE));
    }
  }
  // Add a command to remove any existing files for this library.
  std::vector<std::string> commands1;
  this->LocalGenerator->AppendCleanCommand(commands1, libCleanFiles);
  this->LocalGenerator->CreateCDCommand(commands1,
                                        this->Makefile->GetStartOutputDirectory(),
                                        this->Makefile->GetHomeOutputDirectory());
  commands.insert(commands.end(), commands1.begin(), commands1.end());
  commands1.clear();

  // Add the pre-build and pre-link rules building but not when relinking.
  if(!relink)
    {
    this->LocalGenerator
      ->AppendCustomCommands(commands, this->Target->GetPreBuildCommands());
    this->LocalGenerator
      ->AppendCustomCommands(commands, this->Target->GetPreLinkCommands());
    }

  // Construct the main link rule.
  std::string linkRule = this->Makefile->GetRequiredDefinition(linkRuleVar);
  cmSystemTools::ExpandListArgument(linkRule, commands1);
  this->LocalGenerator->CreateCDCommand(commands1,
                                        this->Makefile->GetStartOutputDirectory(),
                                        this->Makefile->GetHomeOutputDirectory());
  commands.insert(commands.end(), commands1.begin(), commands1.end());

  // Add a rule to create necessary symlinks for the library.
  if(targetOutPath != targetOutPathReal)
    {
    std::string symlink = "$(CMAKE_COMMAND) -E cmake_symlink_library ";
    symlink += targetOutPathReal;
    symlink += " ";
    symlink += targetOutPathSO;
    symlink += " ";
    symlink += targetOutPath;
    commands1.clear();
    commands1.push_back(symlink);
    this->LocalGenerator->CreateCDCommand(commands1,
                                  this->Makefile->GetStartOutputDirectory(),
                                  this->Makefile->GetHomeOutputDirectory());
    commands.insert(commands.end(), commands1.begin(), commands1.end());
    }

  // Add the post-build rules when building but not when relinking.
  if(!relink)
    {
    this->LocalGenerator->
      AppendCustomCommands(commands, this->Target->GetPostBuildCommands());
    }

  // Collect up flags to link in needed libraries.
  cmOStringStream linklibs;
  this->LocalGenerator->OutputLinkLibraries(linklibs, *this->Target, relink);

  // Construct object file lists that may be needed to expand the
  // rule.
  std::string variableName;
  std::string variableNameExternal;
  this->WriteObjectsVariable(variableName, variableNameExternal);
  std::string buildObjs = "$(";
  buildObjs += variableName;
  buildObjs += ") $(";
  buildObjs += variableNameExternal;
  buildObjs += ")";
  std::string cleanObjs = "$(";
  cleanObjs += variableName;
  cleanObjs += ")";

  // Expand placeholders in the commands.
  for(std::vector<std::string>::iterator i = commands.begin();
      i != commands.end(); ++i)
    {
    this->LocalGenerator->ExpandRuleVariables(*i,
                              linkLanguage,
                              buildObjs.c_str(),
                              targetOutPathReal.c_str(),
                              linklibs.str().c_str(),
                              0, 0, 0, buildObjs.c_str(),
                              targetNameSO.c_str(),
                              linkFlags.c_str());
    }

  // Write the build rule.
  this->LocalGenerator->WriteMakeRule(*this->BuildFileStream, 0,
                                      targetFullPathReal.c_str(),
                                      depends, commands, false);

  // The symlink names for the target should depend on the real target
  // so if the target version changes it rebuilds and recreates the
  // symlinks.
  if(targetFullPathSO != targetFullPathReal)
    {
    depends.clear();
    commands.clear();
    depends.push_back(targetFullPathReal.c_str());
    this->LocalGenerator->WriteMakeRule(*this->BuildFileStream, 0,
                                        targetFullPathSO.c_str(),
                                        depends, commands, false);
    }
  if(targetFullPath != targetFullPathSO)
    {
    depends.clear();
    commands.clear();
    depends.push_back(targetFullPathSO.c_str());
    this->LocalGenerator->WriteMakeRule(*this->BuildFileStream, 0,
                                        targetFullPath.c_str(),
                                        depends, commands, false);
    }

  // Write convenience targets.
  std::string dir = this->Makefile->GetStartOutputDirectory();
  dir += "/";
  dir += this->LocalGenerator->GetTargetDirectory(*this->Target);
  std::string buildTargetRuleName = dir;
  buildTargetRuleName += relink?"/preinstall":"/build";
  buildTargetRuleName = 
    this->Convert(buildTargetRuleName.c_str(),
                  cmLocalGenerator::HOME_OUTPUT,cmLocalGenerator::MAKEFILE);
  this->LocalGenerator->WriteConvenienceRule(*this->BuildFileStream, 
                                             targetFullPath.c_str(),
                                             buildTargetRuleName.c_str());

  // Clean all the possible library names and symlinks and object files.
  this->CleanFiles.insert(this->CleanFiles.end(),
                          libCleanFiles.begin(),libCleanFiles.end());
  this->CleanFiles.push_back(cleanObjs);
}