/*============================================================================
  CMake - Cross Platform Makefile Generator
  Copyright 2000-2009 Kitware, Inc., Insight Software Consortium

  Distributed under the OSI-approved BSD License (the "License");
  see accompanying file Copyright.txt for details.

  This software is distributed WITHOUT ANY WARRANTY; without even the
  implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
  See the License for more information.
============================================================================*/
#include "cmFindBase.h"

cmFindBase::cmFindBase()
{
  this->AlreadyInCache = false;
  this->AlreadyInCacheWithoutMetaInfo = false;
  this->NamesPerDir = false;
  this->NamesPerDirAllowed = 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" )
      {
      if(argsIn[j] == "ENV")
        {
        if(j+1 < size)
          {
          j++;
          cmSystemTools::GetPath(args, argsIn[j].c_str());
          }
        }
      else
        {
        args.push_back(argsIn[j]);
        }
      }
    else
      {
      if(j+1 < size)
        {
        foundDoc = true;
        this->VariableDocumentation = argsIn[j+1];
        j++;
        if(j >= size)
          {
          break;
          }
        }
      }
    }
  if(args.size() < 2 )
    {
    this->SetError("called with incorrect number of arguments");
    return false;
    }
  this->VariableName = args[0];
  if(this->CheckForVariableInCache())
    {
    this->AlreadyInCache = true;
    return true;
    }
  this->AlreadyInCache = false;

  // Find the current root path mode.
  this->SelectDefaultRootPathMode();

  // Find the current bundle/framework search policy.
  this->SelectDefaultMacMode();

  bool newStyle = false;
  enum Doing { DoingNone, DoingNames, DoingPaths, DoingPathSuffixes,
               DoingHints };
  Doing doing = DoingNames; // assume it starts with a name
  for (unsigned int j = 1; j < args.size(); ++j)
    {
    if(args[j] == "NAMES")
      {
      doing = DoingNames;
      newStyle = true;
      }
    else if (args[j] == "PATHS")
      {
      doing = DoingPaths;
      newStyle = true;
      }
    else if (args[j] == "HINTS")
      {
      doing = DoingHints;
      newStyle = true;
      }
    else if (args[j] == "PATH_SUFFIXES")
      {
      doing = DoingPathSuffixes;
      newStyle = true;
      }
    else if (args[j] == "NAMES_PER_DIR")
      {
      doing = DoingNone;
      if(this->NamesPerDirAllowed)
        {
        this->NamesPerDir = true;
        }
      else
        {
        this->SetError("does not support NAMES_PER_DIR");
        return false;
        }
      }
    else if (args[j] == "NO_SYSTEM_PATH")
      {
      doing = DoingNone;
      this->NoDefaultPath = true;
      }
    else if (this->CheckCommonArgument(args[j]))
      {
      doing = DoingNone;
      // Some common arguments were accidentally supported by CMake
      // 2.4 and 2.6.0 in the short-hand form of the command, so we
      // must support it even though it is not documented.
      }
    else if(doing == DoingNames)
      {
      this->Names.push_back(args[j]);
      }
    else if(doing == DoingPaths)
      {
      this->UserGuessArgs.push_back(args[j]);
      }
    else if(doing == DoingHints)
      {
      this->UserHintsArgs.push_back(args[j]);
      }
    else if(doing == DoingPathSuffixes)
      {
      this->AddPathSuffix(args[j]);
      }
    }

  if(this->VariableDocumentation.empty())
    {
    this->VariableDocumentation = "Where can ";
    if(this->Names.empty())
      {
      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->VariableDocumentation += cmJoin(cmRange(this->Names).retreat(1),
                                            ", ");
      this->VariableDocumentation += " or "
        + this->Names[this->Names.size() - 1] + " libraries be found";
      }
    }

  // look for old style
  // FIND_*(VAR name path1 path2 ...)
  if(!newStyle)
    {
    // All the short-hand arguments have been recorded as names.
    std::vector<std::string> shortArgs = this->Names;
    this->Names.clear(); // clear out any values in Names
    this->Names.push_back(shortArgs[0]);
    this->UserGuessArgs.insert(this->UserGuessArgs.end(),
                               shortArgs.begin() + 1, shortArgs.end());
    }
  this->ExpandPaths();

  this->ComputeFinalPaths();

  return true;
}

void cmFindBase::ExpandPaths()
{
  if(!this->NoDefaultPath)
    {
    if(!this->NoCMakePath)
      {
      this->FillCMakeVariablePath();
      }
    if(!this->NoCMakeEnvironmentPath)
      {
      this->FillCMakeEnvironmentPath();
      }
    if(!this->NoSystemEnvironmentPath)
      {
      this->FillSystemEnvironmentPath();
      }
    if(!this->NoCMakeSystemPath)
      {
      this->FillCMakeSystemVariablePath();
      }
    }

  this->FillUserHintsPath();
  this->FillUserGuessPath();
}

//----------------------------------------------------------------------------
void cmFindBase::FillCMakeEnvironmentPath()
{
  cmSearchPath &paths = this->LabeledPaths[PathLabel::CMakeEnvironment];

  // Add CMAKE_*_PATH environment variables
  std::string var = "CMAKE_";
  var += this->CMakePathName;
  var += "_PATH";
  paths.AddEnvPrefixPath("CMAKE_PREFIX_PATH");
  paths.AddEnvPath(var);

  if(this->CMakePathName == "PROGRAM")
    {
    paths.AddEnvPath("CMAKE_APPBUNDLE_PATH");
    }
  else
    {
    paths.AddEnvPath("CMAKE_FRAMEWORK_PATH");
    }
  paths.AddSuffixes(this->SearchPathSuffixes);
}

//----------------------------------------------------------------------------
void cmFindBase::FillCMakeVariablePath()
{
  cmSearchPath &paths = this->LabeledPaths[PathLabel::CMake];

  // 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
  std::string var = "CMAKE_";
  var += this->CMakePathName;
  var += "_PATH";
  paths.AddCMakePrefixPath("CMAKE_PREFIX_PATH");
  paths.AddCMakePath(var);

  if(this->CMakePathName == "PROGRAM")
    {
    paths.AddCMakePath("CMAKE_APPBUNDLE_PATH");
    }
  else
    {
    paths.AddCMakePath("CMAKE_FRAMEWORK_PATH");
    }
  paths.AddSuffixes(this->SearchPathSuffixes);
}

//----------------------------------------------------------------------------
void cmFindBase::FillSystemEnvironmentPath()
{
  cmSearchPath &paths = this->LabeledPaths[PathLabel::SystemEnvironment];

  // Add LIB or INCLUDE
  if(!this->EnvironmentPath.empty())
    {
    paths.AddEnvPath(this->EnvironmentPath);
    paths.AddEnvPrefixPath("PATH", true);
    }
  // Add PATH
  paths.AddEnvPath("PATH");
  paths.AddSuffixes(this->SearchPathSuffixes);
}

//----------------------------------------------------------------------------
void cmFindBase::FillCMakeSystemVariablePath()
{
  cmSearchPath &paths = this->LabeledPaths[PathLabel::CMakeSystem];

  std::string var = "CMAKE_SYSTEM_";
  var += this->CMakePathName;
  var += "_PATH";
  paths.AddCMakePrefixPath("CMAKE_SYSTEM_PREFIX_PATH");
  paths.AddCMakePath(var);

  if(this->CMakePathName == "PROGRAM")
    {
    paths.AddCMakePath("CMAKE_SYSTEM_APPBUNDLE_PATH");
    }
  else
    {
    paths.AddCMakePath("CMAKE_SYSTEM_FRAMEWORK_PATH");
    }
  paths.AddSuffixes(this->SearchPathSuffixes);
}

//----------------------------------------------------------------------------
void cmFindBase::FillUserHintsPath()
{
  cmSearchPath &paths = this->LabeledPaths[PathLabel::Hints];

  for(std::vector<std::string>::const_iterator p = this->UserHintsArgs.begin();
      p != this->UserHintsArgs.end(); ++p)
    {
    paths.AddUserPath(*p);
    }
  paths.AddSuffixes(this->SearchPathSuffixes);
}

//----------------------------------------------------------------------------
void cmFindBase::FillUserGuessPath()
{
  cmSearchPath &paths = this->LabeledPaths[PathLabel::Guess];

  for(std::vector<std::string>::const_iterator p = this->UserGuessArgs.begin();
      p != this->UserGuessArgs.end(); ++p)
    {
    paths.AddUserPath(*p);
    }
  paths.AddSuffixes(this->SearchPathSuffixes);
}

//----------------------------------------------------------------------------
void cmFindBase::PrintFindStuff()
{
  std::cerr << "SearchFrameworkLast: " << this->SearchFrameworkLast << "\n";
  std::cerr << "SearchFrameworkOnly: " << this->SearchFrameworkOnly << "\n";
  std::cerr << "SearchFrameworkFirst: " << this->SearchFrameworkFirst << "\n";
  std::cerr << "SearchAppBundleLast: " << this->SearchAppBundleLast << "\n";
  std::cerr << "SearchAppBundleOnly: " << this->SearchAppBundleOnly << "\n";
  std::cerr << "SearchAppBundleFirst: " << this->SearchAppBundleFirst << "\n";
  std::cerr << "VariableName " << this->VariableName << "\n";
  std::cerr << "VariableDocumentation "
            << this->VariableDocumentation << "\n";
  std::cerr << "NoDefaultPath " << this->NoDefaultPath << "\n";
  std::cerr << "NoCMakeEnvironmentPath "
            << this->NoCMakeEnvironmentPath << "\n";
  std::cerr << "NoCMakePath " << this->NoCMakePath << "\n";
  std::cerr << "NoSystemEnvironmentPath "
            << this->NoSystemEnvironmentPath << "\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(std::vector<std::string>::const_iterator i = this->SearchPaths.begin();
      i != this->SearchPaths.end(); ++i)
    {
    std::cerr << "[" << *i << "]\n";
    }
}

bool cmFindBase::CheckForVariableInCache()
{
  if(const char* cacheValue =
     this->Makefile->GetDefinition(this->VariableName))
    {
    cmCacheManager::CacheIterator it =
      this->Makefile->GetCacheManager()->
      GetCacheIterator(this->VariableName.c_str());
    bool found = !cmSystemTools::IsNOTFOUND(cacheValue);
    bool cached = !it.IsAtEnd();
    if(found)
      {
      // If the user specifies the entry on the command line without a
      // type we should add the type and docstring but keep the
      // original value.  Tell the subclass implementations to do
      // this.
      if(cached && it.GetType() == cmCacheManager::UNINITIALIZED)
        {
        this->AlreadyInCacheWithoutMetaInfo = true;
        }
      return true;
      }
    else if(cached)
      {
      const char* hs = it.GetProperty("HELPSTRING");
      this->VariableDocumentation = hs?hs:"(none)";
      }
    }
  return false;
}