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

  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 "cmTargetLinkLibrariesCommand.h"

const char* cmTargetLinkLibrariesCommand::LinkLibraryTypeNames[3] =
{
  "general",
  "debug",
  "optimized"
};

// cmTargetLinkLibrariesCommand
bool cmTargetLinkLibrariesCommand
::InitialPass(std::vector<std::string> const& args, cmExecutionStatus &)
{
  // must have one argument
  if(args.size() < 1)
    {
    this->SetError("called with incorrect number of arguments");
    return false;
    }

  // but we might not have any libs after variable expansion
  if(args.size() < 2)
    {
    return true;
    }

  // Keep track of link configuration specifiers.
  cmTarget::LinkLibraryType llt = cmTarget::GENERAL;
  bool haveLLT = false;

  // add libraries, nothe that there is an optional prefix 
  // of debug and optimized than can be used
  std::vector<std::string>::const_iterator i = args.begin();
  
  for(++i; i != args.end(); ++i)
    {
    if(*i == "debug")
      {
      if(haveLLT)
        {
        this->LinkLibraryTypeSpecifierWarning(llt, cmTarget::DEBUG);
        }
      llt = cmTarget::DEBUG;
      haveLLT = true;
      }
    else if(*i == "optimized")
      {
      if(haveLLT)
        {
        this->LinkLibraryTypeSpecifierWarning(llt, cmTarget::OPTIMIZED);
        }
      llt = cmTarget::OPTIMIZED;
      haveLLT = true;
      }
    else if(*i == "general")
      {
      if(haveLLT)
        {
        this->LinkLibraryTypeSpecifierWarning(llt, cmTarget::GENERAL);
        }
      llt = cmTarget::GENERAL;
      haveLLT = true;
      }
    else if(haveLLT)
      {
      // The link type was specified by the previous argument.
      haveLLT = false;
      this->Makefile->AddLinkLibraryForTarget(args[0].c_str(),
                                              i->c_str(), llt);
      }
    else
      {
      // Lookup old-style cache entry if type is unspecified.  So if you
      // do a target_link_libraries(foo optimized bar) it will stay optimized
      // and not use the lookup.  As there maybe the case where someone has
      // specifed that a library is both debug and optimized.  (this check is
      // only there for backwards compatibility when mixing projects built
      // with old versions of CMake and new)
      llt = cmTarget::GENERAL;
      std::string linkType = args[0];
      linkType += "_LINK_TYPE";
      const char* linkTypeString = 
        this->Makefile->GetDefinition( linkType.c_str() );
      if(linkTypeString)
        {
        if(strcmp(linkTypeString, "debug") == 0)
          {
          llt = cmTarget::DEBUG;
          }
        if(strcmp(linkTypeString, "optimized") == 0)
          {
          llt = cmTarget::OPTIMIZED;
          }
        }
      this->Makefile->AddLinkLibraryForTarget(args[0].c_str(),i->c_str(),llt);
      }
    } 

  // Make sure the last argument was not a library type specifier.
  if(haveLLT)
    {
    cmOStringStream e;
    e << "The \"" << this->LinkLibraryTypeNames[llt]
      << "\" argument must be followed by a library.";
    this->Makefile->IssueMessage(cmake::FATAL_ERROR, e.str());
    cmSystemTools::SetFatalErrorOccured();
    }

  return true;
}

//----------------------------------------------------------------------------
void
cmTargetLinkLibrariesCommand
::LinkLibraryTypeSpecifierWarning(int left, int right)
{
  cmOStringStream w;
  w << "Link library type specifier \""
    << this->LinkLibraryTypeNames[left] << "\" is followed by specifier \""
    << this->LinkLibraryTypeNames[right] << "\" instead of a library name.  "
    << "The first specifier will be ignored.";
  this->Makefile->IssueMessage(cmake::AUTHOR_WARNING, w.str());
}