/*============================================================================
  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 "cmGetFilenameComponentCommand.h"

#include "cmSystemTools.h"

// cmGetFilenameComponentCommand
bool cmGetFilenameComponentCommand::InitialPass(
  std::vector<std::string> const& args, cmExecutionStatus&)
{
  if (args.size() < 3) {
    this->SetError("called with incorrect number of arguments");
    return false;
  }

  // Check and see if the value has been stored in the cache
  // already, if so use that value
  if (args.size() >= 4 && args[args.size() - 1] == "CACHE") {
    const char* cacheValue = this->Makefile->GetDefinition(args[0]);
    if (cacheValue && !cmSystemTools::IsNOTFOUND(cacheValue)) {
      return true;
    }
  }

  std::string result;
  std::string filename = args[1];
  if (filename.find("[HKEY") != filename.npos) {
    // Check the registry as the target application would view it.
    cmSystemTools::KeyWOW64 view = cmSystemTools::KeyWOW64_32;
    cmSystemTools::KeyWOW64 other_view = cmSystemTools::KeyWOW64_64;
    if (this->Makefile->PlatformIs64Bit()) {
      view = cmSystemTools::KeyWOW64_64;
      other_view = cmSystemTools::KeyWOW64_32;
    }
    cmSystemTools::ExpandRegistryValues(filename, view);
    if (filename.find("/registry") != filename.npos) {
      std::string other = args[1];
      cmSystemTools::ExpandRegistryValues(other, other_view);
      if (other.find("/registry") == other.npos) {
        filename = other;
      }
    }
  }
  std::string storeArgs;
  std::string programArgs;
  if (args[2] == "DIRECTORY" || args[2] == "PATH") {
    result = cmSystemTools::GetFilenamePath(filename);
  } else if (args[2] == "NAME") {
    result = cmSystemTools::GetFilenameName(filename);
  } else if (args[2] == "PROGRAM") {
    for (unsigned int i = 2; i < args.size(); ++i) {
      if (args[i] == "PROGRAM_ARGS") {
        i++;
        if (i < args.size()) {
          storeArgs = args[i];
        }
      }
    }
    cmSystemTools::SplitProgramFromArgs(filename, result, programArgs);
  } else if (args[2] == "EXT") {
    result = cmSystemTools::GetFilenameExtension(filename);
  } else if (args[2] == "NAME_WE") {
    result = cmSystemTools::GetFilenameWithoutExtension(filename);
  } else if (args[2] == "ABSOLUTE" || args[2] == "REALPATH") {
    // If the path given is relative, evaluate it relative to the
    // current source directory unless the user passes a different
    // base directory.
    std::string baseDir = this->Makefile->GetCurrentSourceDirectory();
    for (unsigned int i = 3; i < args.size(); ++i) {
      if (args[i] == "BASE_DIR") {
        ++i;
        if (i < args.size()) {
          baseDir = args[i];
        }
      }
    }
    // Collapse the path to its simplest form.
    result = cmSystemTools::CollapseFullPath(filename, baseDir);
    if (args[2] == "REALPATH") {
      // Resolve symlinks if possible
      result = cmSystemTools::GetRealPath(result);
    }
  } else {
    std::string err = "unknown component " + args[2];
    this->SetError(err);
    return false;
  }

  if (args.size() >= 4 && args[args.size() - 1] == "CACHE") {
    if (!programArgs.empty() && !storeArgs.empty()) {
      this->Makefile->AddCacheDefinition(storeArgs, programArgs.c_str(), "",
                                         args[2] == "PATH" ? cmState::FILEPATH
                                                           : cmState::STRING);
    }
    this->Makefile->AddCacheDefinition(args[0], result.c_str(), "",
                                       args[2] == "PATH" ? cmState::FILEPATH
                                                         : cmState::STRING);
  } else {
    if (!programArgs.empty() && !storeArgs.empty()) {
      this->Makefile->AddDefinition(storeArgs, programArgs.c_str());
    }
    this->Makefile->AddDefinition(args[0], result.c_str());
  }

  return true;
}