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

  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 "cmFindBase.h"
  
cmFindBase::cmFindBase()
{
  this->AlreadyInCache = false;
  this->NoSystemPath = false;
  this->NoCMakePath = false;
  this->NoCMakeEnvironmentPath = false;
  this->NoCMakeSystemPath = false;
  // default is to search frameworks first on apple
#if defined(__APPLE__)
  this->SearchFrameworkFirst = true;
#else
   this->SearchFrameworkFirst = false;
#endif
  this->SearchFrameworkOnly = false;
  this->SearchFrameworkLast = false;
}

bool cmFindBase::ParseArguments(std::vector<std::string> const& argsIn)
{
  if(argsIn.size() < 2 )
    {
    this->SetError("called with incorrect number of arguments");
    return false;
    }
  // copy argsIn into args so it can be modified,
  // in the process extract the DOC "documentation" 
  size_t size = argsIn.size();
  std::vector<std::string> args;
  bool foundDoc = false;
  for(unsigned int j = 0; j < size; ++j)
    {
    if(foundDoc  || argsIn[j] != "DOC" )
      {
      args.push_back(argsIn[j]);
      }
    else
      {
      if(j+1 < size)
        {
        foundDoc = true;
        this->VariableDocumentation = argsIn[j+1];
        j++;
        if(j >= size)
          {
          break;
          }
        }
      }
    }
  this->VariableName = args[0];
  if(this->CheckForVariableInCache())
    {
    this->AlreadyInCache = true;
    return true;
    }
  this->AlreadyInCache = false; 
  std::vector<std::string> userPaths;
  std::string doc;
  bool foundName = false;
  bool doingNames = false;
  bool foundPaths = false;
  bool doingPaths = false;
  bool doingPathSuf = false;
  bool newStyle = false;

  for (unsigned int j = 1; j < args.size(); ++j)
    {
    if(args[j] == "NAMES")
      {
      doingNames = true;
      newStyle = true;
      doingPathSuf = false;
      doingPaths = false;
      }
    else if (args[j] == "PATHS")
      {
      doingPaths = true;
      newStyle = true;
      doingNames = false;
      doingPathSuf = false;
      }
    else if (args[j] == "PATH_SUFFIXES")
      { 
      doingPathSuf = true;
      newStyle = true;
      doingNames = false;
      doingPaths = false;
      }
    else if (args[j] == "NO_SYSTEM_PATH")
      {
      this->NoSystemPath = true;
      }
    else if (args[j] == "NO_CMAKE_PATH")
      {
      this->NoCMakePath = true;
      }
    else if (args[j] == "NO_CMAKE_ENVIRONMENT_PATH")
      {
      this->NoCMakeEnvironmentPath = true;
      }
    else if (args[j] == "NO_CMAKE_SYSTEM_PATH")
      {
      this->NoCMakeSystemPath = true;
      }
    else
      {
      if(doingNames)
        {
        this->Names.push_back(args[j]);
        }
      else if(doingPaths)
        { 
        userPaths.push_back(args[j]);
        }
      else if(doingPathSuf)
        { 
        this->SearchPathSuffixes.push_back(args[j]);
        }
      }
    }
  if(this->VariableDocumentation.size() == 0)
    {
    this->VariableDocumentation = "Whare can ";
    if(this->Names.size() == 0)
      {
      this->VariableDocumentation += "the (unknown) library be found";
      }
    else if(this->Names.size() == 1)
      {
      this->VariableDocumentation += "the " + this->Names[0] + " library be found";
      }
    else
      { 
      this->VariableDocumentation += "one of the " + this->Names[0];
      for (unsigned int j = 1; j < this->Names.size() - 1; ++j)
        {
        this->VariableDocumentation += ", " + this->Names[j];
        }
      this->VariableDocumentation += " or " + this->Names[this->Names.size() - 1] + " libraries be found";
      }
    }

  // look for old style
  // FIND_*(VAR name path1 path2 ...)
  if(!newStyle)
    {
    std::cerr << "oldstyle\n";
    this->Names.push_back(args[1]);
    for(unsigned int j = 2; j < args.size(); ++j)
      {
      userPaths.push_back(args[j]);
      }
    }
  this->ExpandPaths(userPaths);
  return true;
}

void cmFindBase::ExpandPaths(std::vector<std::string> userPaths)
{
  // Add CMAKE_*_PATH environment variables
  if(!this->NoCMakeEnvironmentPath)
    {
    this->AddEnvironmentVairables();
    }
  // Add CMake varibles of the same name as the previous environment
  // varibles CMAKE_*_PATH to be used most of the time with -D
  // command line options
  if(!this->NoCMakePath)
    {
    this->AddCMakeVairables();
    }
  // add System environment PATH and (LIB or INCLUDE)
  if(!this->NoSystemPath)
    {
    this->AddSystemEnvironmentVairables();
    }
  // Add CMAKE_SYSTEM_*_PATH variables which are defined in platform files
  if(!this->NoCMakeSystemPath)
    {
    this->AddCMakeSystemVariables();
    }
  // add the paths specified in the FIND_* call 
  for(unsigned int i =0; i < userPaths.size(); ++i)
    {
    this->SearchPaths.push_back(userPaths[i]);
    }
  // clean things up
  this->ExpandRegistryAndCleanPath();
}

void cmFindBase::AddEnvironmentVairables()
{ 
  if(this->SearchFrameworkFirst || this->SearchFrameworkOnly)
    {
    cmSystemTools::GetPath(this->SearchPaths, "CMAKE_FRAMEWORK_PATH");
    }
  std::string var = "CMAKE_";
  var += this->CMakePathName;
  var += "_PATH";
  cmSystemTools::GetPath(this->SearchPaths, var.c_str());
  if(this->SearchFrameworkLast)
    {
    cmSystemTools::GetPath(this->SearchPaths, "CMAKE_FRAMEWORK_PATH");
    }

}

void cmFindBase::AddCMakeVairables()
{ 
  if(this->SearchFrameworkFirst || this->SearchFrameworkOnly)
    { 
    if(const char* path = m_Makefile->GetDefinition("CMAKE_FRAMEWORK_PATH"))
      {
      cmSystemTools::ExpandListArgument(path, this->SearchPaths);
      }
    }
  std::string var = "CMAKE_";
  var += this->CMakePathName;
  var += "_PATH";
  if(const char* path = m_Makefile->GetDefinition(var.c_str()))
    {
    cmSystemTools::ExpandListArgument(path, this->SearchPaths);
    } 
  if(this->SearchFrameworkLast)
    {
    if(const char* path = m_Makefile->GetDefinition("CMAKE_FRAMEWORK_PATH"))
      {
      cmSystemTools::ExpandListArgument(path, this->SearchPaths);
      }
    }
}

void cmFindBase::AddSystemEnvironmentVairables()
{
  // Add LIB or INCLUDE
  if(this->EnvironmentPath.size())
    {
    cmSystemTools::GetPath(this->SearchPaths, this->EnvironmentPath.c_str());
    }
  // Add PATH 
  cmSystemTools::GetPath(this->SearchPaths);
}

void cmFindBase::AddCMakeSystemVariables()
{  
  if(this->SearchFrameworkFirst || this->SearchFrameworkOnly)
    { 
    if(const char* path = m_Makefile->GetDefinition("CMAKE_SYSTEM_FRAMEWORK_PATH"))
      {
      cmSystemTools::ExpandListArgument(path, this->SearchPaths);
      }
    }
  std::string var = "CMAKE_SYSTEM_";
  var += this->CMakePathName;
  var += "_PATH";
  if(const char* path = m_Makefile->GetDefinition(var.c_str()))
    {
    cmSystemTools::ExpandListArgument(path, this->SearchPaths);
    }  
  if(this->SearchFrameworkLast)
    {
    if(const char* path = m_Makefile->GetDefinition("CMAKE_SYSTEM_FRAMEWORK_PATH"))
      {
      cmSystemTools::ExpandListArgument(path, this->SearchPaths);
      }
    }
}

void cmFindBase::ExpandRegistryAndCleanPath()
{
  std::vector<std::string> finalPath;
  std::vector<std::string>::iterator i;
  for(i = this->SearchPaths.begin();
      i != this->SearchPaths.end(); ++i)
    {
    cmSystemTools::ExpandRegistryValues(*i);
    cmSystemTools::GlobDirs(i->c_str(), finalPath);
    }
  this->SearchPaths.clear();
  // convert all paths to unix slashes
  for(i = finalPath.begin();
      i != finalPath.end(); ++i)
    {
    cmSystemTools::ConvertToUnixSlashes(*i);
    // copy each finalPath combined with SearchPathSuffixes
    // to the SearchPaths ivar
    for(std::vector<std::string>::iterator j = this->SearchPathSuffixes.begin();
        j != this->SearchPathSuffixes.end(); ++j)
      {
      std::string p = *i + std::string("/") + *j;
      if(cmSystemTools::FileIsDirectory(p.c_str()))
        {
        this->SearchPaths.push_back(p);
        }
      }
    }
  // now put the path without the path suffixes in the SearchPaths
  for(i = finalPath.begin();
      i != finalPath.end(); ++i)
    {
    if(cmSystemTools::FileIsDirectory(i->c_str()))
      {
      this->SearchPaths.push_back(*i);
      }
    }
}

void cmFindBase::PrintFindStuff()
{
  std::cerr << "VariableName " << this->VariableName << "\n";
  std::cerr << "VariableDocumentation " << this->VariableDocumentation << "\n";
  std::cerr << "NoSystemPath " << this->NoSystemPath << "\n";
  std::cerr << "NoCMakeEnvironmentPath " << this->NoCMakeEnvironmentPath << "\n";
  std::cerr << "NoCMakePath " << this->NoCMakePath << "\n";
  std::cerr << "NoCMakeSystemPath " << this->NoCMakeSystemPath << "\n";
  std::cerr << "EnvironmentPath " << this->EnvironmentPath << "\n";
  std::cerr << "CMakePathName " << this->CMakePathName << "\n";
  std::cerr << "Names  ";
  for(unsigned int i =0; i < this->Names.size(); ++i)
    {
    std::cerr << this->Names[i] << " ";
    }
  std::cerr << "\n";
  std::cerr << "\n";
  std::cerr << "SearchPathSuffixes  ";
  for(unsigned int i =0; i < this->SearchPathSuffixes.size(); ++i)
    {
    std::cerr << this->SearchPathSuffixes[i] << "\n";
    }
  std::cerr << "\n";
  std::cerr << "SearchPaths\n";
  for(unsigned int i =0; i < this->SearchPaths.size(); ++i)
    {
    std::cerr << "[" << this->SearchPaths[i] << "]\n";
    }
}

bool cmFindBase::CheckForVariableInCache()
{
  std::cerr << "CheckForVariableInCache " << this->VariableName << "\n";
  const char* cacheValue
    = m_Makefile->GetDefinition(this->VariableName.c_str());
  if(cacheValue && !cmSystemTools::IsNOTFOUND(cacheValue))
    {
    return true;
    }
  if(cacheValue)
    {
    std::cerr << "Cachevalue " << cacheValue << "\n";
    cmCacheManager::CacheIterator it = 
      m_Makefile->GetCacheManager()->GetCacheIterator(this->VariableName.c_str());
    if(!it.IsAtEnd())
      {
      const char* hs = it.GetProperty("HELPSTRING");
      this->VariableDocumentation = hs?hs:"(none)";
      }
    }
  return false;
}