/*============================================================================
  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.
============================================================================*/

#ifndef cmGlobalGenerator_h
#define cmGlobalGenerator_h

#include "cmStandardIncludes.h"

#include "cmTarget.h" // For cmTargets
#include "cmTargetDepend.h" // For cmTargetDependSet
#include "cmSystemTools.h" // for cmSystemTools::OutputOption
#include "cmExportSetMap.h" // For cmExportSetMap
#include "cmGeneratorTarget.h"
#include "cmGeneratorExpression.h"
#include "cmState.h"

#if defined(CMAKE_BUILD_WITH_CMAKE)
# include "cmFileLockPool.h"
# ifdef CMake_HAVE_CXX11_UNORDERED_MAP
#  include <unordered_map>
# else
#  include <cmsys/hash_map.hxx>
# endif
#endif

class cmake;
class cmGeneratorTarget;
class cmGeneratorExpressionEvaluationFile;
class cmMakefile;
class cmLocalGenerator;
class cmExternalMakefileProjectGenerator;
class cmTarget;
class cmInstallTargetGenerator;
class cmInstallFilesGenerator;
class cmExportBuildFileGenerator;
class cmQtAutoGenerators;

/** \class cmGlobalGenerator
 * \brief Responsible for overseeing the generation process for the entire tree
 *
 * Subclasses of this class generate makefiles for various
 * platforms.
 */
class cmGlobalGenerator
{
public:
  ///! Free any memory allocated with the GlobalGenerator
  cmGlobalGenerator(cmake* cm);
  virtual ~cmGlobalGenerator();

  cmLocalGenerator* MakeLocalGenerator(
      cmState::Snapshot snapshot = cmState::Snapshot(),
      cmLocalGenerator* parent = 0);

  ///! Get the name for this generator
  virtual std::string GetName() const { return "Generic"; }

  /** Check whether the given name matches the current generator.  */
  virtual bool MatchesGeneratorName(const std::string& name) const
  { return this->GetName() == name; }

  /** Tell the generator about the target system.  */
  virtual bool SetSystemName(std::string const&, cmMakefile*)
    { return true; }

  /** Set the generator-specific platform name.  Returns true if platform
      is supported and false otherwise.  */
  virtual bool SetGeneratorPlatform(std::string const& p, cmMakefile* mf);

  /** Set the generator-specific toolset name.  Returns true if toolset
      is supported and false otherwise.  */
  virtual bool SetGeneratorToolset(std::string const& ts, cmMakefile* mf);

  /**
   * Create LocalGenerators and process the CMakeLists files. This does not
   * actually produce any makefiles, DSPs, etc.
   */
  virtual void Configure();

  /**
   * Generate the all required files for building this project/tree. This
   * basically creates a series of LocalGenerators for each directory and
   * requests that they Generate.
   */
  void DoGenerate();

  /**
   * Set/Get and Clear the enabled languages.
   */
  void SetLanguageEnabled(const std::string&, cmMakefile* mf);
  bool GetLanguageEnabled(const std::string&) const;
  void ClearEnabledLanguages();
  void GetEnabledLanguages(std::vector<std::string>& lang) const;
  /**
   * Try to determine system information such as shared library
   * extension, pthreads, byte order etc.
   */
  virtual void EnableLanguage(std::vector<std::string>const& languages,
                              cmMakefile *, bool optional);

  /**
   * Resolve the CMAKE_<lang>_COMPILER setting for the given language.
   * Intended to be called from EnableLanguage.
   */
  void ResolveLanguageCompiler(const std::string &lang, cmMakefile *mf,
                               bool optional) const;

  /**
   * Try to determine system information, get it from another generator
   */
  virtual void EnableLanguagesFromGenerator(cmGlobalGenerator *gen,
                                            cmMakefile* mf);

  /**
   * Try running cmake and building a file. This is used for dynamically
   * loaded commands, not as part of the usual build process.
   */
  int TryCompile(const std::string& srcdir, const std::string& bindir,
                         const std::string& projectName,
                         const std::string& targetName,
                         bool fast, std::string& output, cmMakefile* mf);


  /**
   * Build a file given the following information. This is a more direct call
   * that is used by both CTest and TryCompile. If target name is NULL or
   * empty then all is assumed. clean indicates if a "make clean" should be
   * done first.
   */
  int Build(const std::string& srcdir, const std::string& bindir,
            const std::string& projectName, const std::string& targetName,
            std::string& output,
            const std::string& makeProgram, const std::string& config,
            bool clean, bool fast, bool verbose,
            double timeout,
            cmSystemTools::OutputOption outputflag=cmSystemTools::OUTPUT_NONE,
            std::vector<std::string> const& nativeOptions =
            std::vector<std::string>());

  virtual void GenerateBuildCommand(
    std::vector<std::string>& makeCommand,
    const std::string& makeProgram,
    const std::string& projectName, const std::string& projectDir,
    const std::string& targetName, const std::string& config,
    bool fast, bool verbose,
    std::vector<std::string> const& makeOptions = std::vector<std::string>()
    );

  /** Generate a "cmake --build" call for a given target and config.  */
  std::string GenerateCMakeBuildCommand(const std::string& target,
                                        const std::string& config,
                                        const std::string& native,
                                        bool ignoreErrors);

  ///! Get the CMake instance
  cmake *GetCMakeInstance() const { return this->CMakeInstance; }

  void SetConfiguredFilesPath(cmGlobalGenerator* gen);
  const std::vector<cmLocalGenerator *>& GetLocalGenerators() const {
    return this->LocalGenerators;}

  cmLocalGenerator* GetCurrentLocalGenerator()
                                          {return this->CurrentLocalGenerator;}

  void SetCurrentLocalGenerator(cmLocalGenerator* lg)
                                            {this->CurrentLocalGenerator = lg;}

  void AddLocalGenerator(cmLocalGenerator *lg);

  ///! Set an generator for an "external makefile based project"
  void SetExternalMakefileProjectGenerator(
                           cmExternalMakefileProjectGenerator *extraGenerator);

  std::string GetExtraGeneratorName() const;

  void AddInstallComponent(const char* component);

  const std::set<std::string>* GetInstallComponents() const
    { return &this->InstallComponents; }

  cmExportSetMap& GetExportSets() {return this->ExportSets;}

  /** Add a file to the manifest of generated targets for a configuration.  */
  void AddToManifest(const std::string& config, std::string const& f);

  void EnableInstallTarget();

  int TryCompileTimeout;

  bool GetForceUnixPaths() const { return this->ForceUnixPaths; }
  bool GetToolSupportsColor() const { return this->ToolSupportsColor; }

  ///! return the language for the given extension
  std::string GetLanguageFromExtension(const char* ext) const;
  ///! is an extension to be ignored
  bool IgnoreFile(const char* ext) const;
  ///! What is the preference for linkers and this language (None or Preferred)
  int GetLinkerPreference(const std::string& lang) const;
  ///! What is the object file extension for a given source file?
  std::string GetLanguageOutputExtension(cmSourceFile const&) const;

  ///! What is the configurations directory variable called?
  virtual const char* GetCMakeCFGIntDir() const { return "."; }

  ///! expand CFGIntDir for a configuration
  virtual std::string ExpandCFGIntDir(const std::string& str,
                                      const std::string& config) const;

  /** Get whether the generator should use a script for link commands.  */
  bool GetUseLinkScript() const { return this->UseLinkScript; }

  /** Get whether the generator should produce special marks on rules
      producing symbolic (non-file) outputs.  */
  bool GetNeedSymbolicMark() const { return this->NeedSymbolicMark; }

  /*
   * Determine what program to use for building the project.
   */
  virtual void FindMakeProgram(cmMakefile*);

#if defined(_WIN32) && !defined(__CYGWIN__)
  /** Is this the Visual Studio 6 generator?  */
  virtual bool IsForVS6() const { return false; }
#endif

  ///! Find a target by name by searching the local generators.
  cmTarget* FindTarget(const std::string& name,
                       bool excludeAliases = false) const;

  void AddAlias(const std::string& name, cmTarget *tgt);
  bool IsAlias(const std::string& name) const;

  /** Determine if a name resolves to a framework on disk or a built target
      that is a framework. */
  bool NameResolvesToFramework(const std::string& libname) const;

  ///! Find a local generator by its startdirectory
  cmLocalGenerator* FindLocalGenerator(const std::string& start_dir) const;

  /** Append the subdirectory for the given configuration.  If anything is
      appended the given prefix and suffix will be appended around it, which
      is useful for leading or trailing slashes.  */
  virtual void AppendDirectoryForConfig(const std::string& prefix,
                                        const std::string& config,
                                        const std::string& suffix,
                                        std::string& dir);

  /** Get the manifest of all targets that will be built for each
      configuration.  This is valid during generation only.  */
  cmTargetManifest const& GetTargetManifest() const
    { return this->TargetManifest; }

  /** Get the content of a directory.  Directory listings are cached
      and re-loaded from disk only when modified.  During the generation
      step the content will include the target files to be built even if
      they do not yet exist.  */
  std::set<std::string> const& GetDirectoryContent(std::string const& dir,
                                                   bool needDisk = true);

  void AddTarget(cmTarget* t);

  static bool IsReservedTarget(std::string const& name);

  virtual const char* GetAllTargetName()         const { return "ALL_BUILD"; }
  virtual const char* GetInstallTargetName()       const { return "INSTALL"; }
  virtual const char* GetInstallLocalTargetName()  const { return 0; }
  virtual const char* GetInstallStripTargetName()  const { return 0; }
  virtual const char* GetPreinstallTargetName()    const { return 0; }
  virtual const char* GetTestTargetName()        const { return "RUN_TESTS"; }
  virtual const char* GetPackageTargetName()       const { return "PACKAGE"; }
  virtual const char* GetPackageSourceTargetName() const { return 0; }
  virtual const char* GetEditCacheTargetName()     const { return 0; }
  virtual const char* GetRebuildCacheTargetName()  const { return 0; }
  virtual const char* GetCleanTargetName()         const { return 0; }

  // Lookup edit_cache target command preferred by this generator.
  virtual std::string GetEditCacheCommand() const { return ""; }

  // Class to track a set of dependencies.
  typedef cmTargetDependSet TargetDependSet;

  // what targets does the specified target depend on directly
  // via a target_link_libraries or add_dependencies
  TargetDependSet const& GetTargetDirectDepends(cmTarget const& target);

  /** Get per-target generator information.  */
  cmGeneratorTarget* GetGeneratorTarget(cmTarget const*) const;

  const std::map<std::string, std::vector<cmLocalGenerator*> >& GetProjectMap()
                                               const {return this->ProjectMap;}

  // track files replaced during a Generate
  void FileReplacedDuringGenerate(const std::string& filename);
  void GetFilesReplacedDuringGenerate(std::vector<std::string>& filenames);

  void AddRuleHash(const std::vector<std::string>& outputs,
                   std::string const& content);

  /** Return whether the given binary directory is unused.  */
  bool BinaryDirectoryIsNew(const std::string& dir)
    {
    return this->BinaryDirectories.insert(dir).second;
    }
  /** Supported systems creates a GUID for the given name */
  virtual void CreateGUID(const std::string&) {}

  /** Return true if the generated build tree may contain multiple builds.
      i.e. "Can I build Debug and Release in the same tree?" */
  virtual bool IsMultiConfig() { return false; }

  std::string GetSharedLibFlagsForLanguage(std::string const& lang) const;

  /** Generate an <output>.rule file path for a given command output.  */
  virtual std::string GenerateRuleFile(std::string const& output) const;

  static std::string EscapeJSON(const std::string& s);

  void AddEvaluationFile(const std::string &inputFile,
                  cmsys::auto_ptr<cmCompiledGeneratorExpression> outputName,
                  cmMakefile *makefile,
                  cmsys::auto_ptr<cmCompiledGeneratorExpression> condition,
                  bool inputIsContent);

  void ProcessEvaluationFiles();

  std::map<std::string, cmExportBuildFileGenerator*>& GetBuildExportSets()
    {return this->BuildExportSets;}
  void AddBuildExportSet(cmExportBuildFileGenerator*);
  void AddBuildExportExportSet(cmExportBuildFileGenerator*);
  bool IsExportedTargetsFile(const std::string &filename) const;
  bool GenerateImportFile(const std::string &file);
  cmExportBuildFileGenerator*
  GetExportedTargetsFile(const std::string &filename) const;
  void AddCMP0042WarnTarget(const std::string& target);

  virtual void ComputeTargetObjectDirectory(cmGeneratorTarget* gt) const;

  bool GenerateCPackPropertiesFile();

  void CreateEvaluationSourceFiles(std::string const& config) const;

  void SetFilenameTargetDepends(cmSourceFile* sf,
                                std::set<cmTarget const*> tgts);
  std::set<cmTarget const*> const&
  GetFilenameTargetDepends(cmSourceFile* sf) const;

#if defined(CMAKE_BUILD_WITH_CMAKE)
  cmFileLockPool& GetFileLockPool() { return FileLockPool; }
#endif

  std::string MakeSilentFlag;
protected:
  virtual void Generate();

  typedef std::vector<cmLocalGenerator*> GeneratorVector;
  // for a project collect all its targets by following depend
  // information, and also collect all the targets
  void GetTargetSets(TargetDependSet& projectTargets,
                             TargetDependSet& originalTargets,
                             cmLocalGenerator* root, GeneratorVector const&);
  bool IsRootOnlyTarget(cmTarget* target) const;
  void AddTargetDepends(cmTarget const* target,
                        TargetDependSet& projectTargets);
  void SetLanguageEnabledFlag(const std::string& l, cmMakefile* mf);
  void SetLanguageEnabledMaps(const std::string& l, cmMakefile* mf);
  void FillExtensionToLanguageMap(const std::string& l, cmMakefile* mf);

  virtual bool ComputeTargetDepends();

  virtual bool CheckALLOW_DUPLICATE_CUSTOM_TARGETS() const;

  typedef std::vector<std::pair<cmQtAutoGenerators,
                                cmTarget const*> > AutogensType;
  void CreateQtAutoGeneratorsTargets(AutogensType& autogens);

  std::string SelectMakeProgram(const std::string& makeProgram,
                                const std::string& makeDefault = "") const;

  // Fill the ProjectMap, this must be called after LocalGenerators
  // has been populated.
  void FillProjectMap();
  void CheckLocalGenerators();
  bool IsExcluded(cmLocalGenerator* root, cmLocalGenerator* gen) const;
  bool IsExcluded(cmLocalGenerator* root, cmTarget const& target) const;
  void FillLocalGeneratorToTargetMap();
  void CreateDefaultGlobalTargets(cmTargets* targets);
  cmTarget CreateGlobalTarget(const std::string& name, const char* message,
    const cmCustomCommandLines* commandLines,
    std::vector<std::string> depends, const char* workingDir,
    bool uses_terminal);

  bool NeedSymbolicMark;
  bool UseLinkScript;
  bool ForceUnixPaths;
  bool ToolSupportsColor;
  std::string FindMakeProgramFile;
  std::string ConfiguredFilesPath;
  cmake *CMakeInstance;
  std::vector<cmLocalGenerator *> LocalGenerators;
  cmLocalGenerator* CurrentLocalGenerator;
  // map from project name to vector of local generators in that project
  std::map<std::string, std::vector<cmLocalGenerator*> > ProjectMap;
  std::map<cmLocalGenerator*, std::set<cmTarget const*> >
                                                    LocalGeneratorToTargetMap;

  // Set of named installation components requested by the project.
  std::set<std::string> InstallComponents;
  bool InstallTargetEnabled;
  // Sets of named target exports
  cmExportSetMap ExportSets;
  std::map<std::string, cmExportBuildFileGenerator*> BuildExportSets;
  std::map<std::string, cmExportBuildFileGenerator*> BuildExportExportSets;

  // Manifest of all targets that will be built for each configuration.
  // This is computed just before local generators generate.
  cmTargetManifest TargetManifest;

  // All targets in the entire project.
#if defined(CMAKE_BUILD_WITH_CMAKE)
#ifdef CMake_HAVE_CXX11_UNORDERED_MAP
  typedef std::unordered_map<std::string, cmTarget*> TargetMap;
#else
  typedef cmsys::hash_map<std::string, cmTarget*> TargetMap;
#endif
#else
  typedef std::map<std::string,cmTarget *> TargetMap;
#endif
  TargetMap TotalTargets;
  TargetMap AliasTargets;
  TargetMap ImportedTargets;
  std::vector<cmGeneratorExpressionEvaluationFile*> EvaluationFiles;

  const char* GetPredefinedTargetsFolder();
  virtual bool UseFolderProperty();

private:
  ///! Create a local generator appropriate to this Global Generator
  virtual cmLocalGenerator *CreateLocalGenerator(cmLocalGenerator* parent,
                                                 cmState::Snapshot snapshot);

  cmMakefile* TryCompileOuterMakefile;
  float FirstTimeProgress;
  // If you add a new map here, make sure it is copied
  // in EnableLanguagesFromGenerator
  std::map<std::string, bool> IgnoreExtensions;
  std::set<std::string> LanguagesReady; // Ready for try_compile
  std::map<std::string, std::string> OutputExtensions;
  std::map<std::string, std::string> LanguageToOutputExtension;
  std::map<std::string, std::string> ExtensionToLanguage;
  std::map<std::string, int> LanguageToLinkerPreference;
  std::map<std::string, std::string> LanguageToOriginalSharedLibFlags;

  // Record hashes for rules and outputs.
  struct RuleHash { char Data[32]; };
  std::map<std::string, RuleHash> RuleHashes;
  void CheckRuleHashes();
  void CheckRuleHashes(std::string const& pfile, std::string const& home);
  void WriteRuleHashes(std::string const& pfile);

  void WriteSummary();
  void WriteSummary(cmTarget* target);
  void FinalizeTargetCompileInfo();

  virtual void ForceLinkerLanguages();

  virtual void PrintCompilerAdvice(std::ostream& os, std::string const& lang,
                                   const char* envVar) const;
  void CheckCompilerIdCompatibility(cmMakefile* mf,
                                    std::string const& lang) const;

  cmExternalMakefileProjectGenerator* ExtraGenerator;

  // track files replaced during a Generate
  std::vector<std::string> FilesReplacedDuringGenerate;

  // Store computed inter-target dependencies.
  typedef std::map<cmTarget const*, TargetDependSet> TargetDependMap;
  TargetDependMap TargetDependencies;

  // Per-target generator information.
  cmGeneratorTargetsType GeneratorTargets;
  friend class cmake;
  void CreateGeneratorTargets(cmMakefile* mf);
  void CreateGeneratorTargets();

  void ClearGeneratorMembers();

  virtual const char* GetBuildIgnoreErrorsFlag() const { return 0; }

  // Cache directory content and target files to be built.
  struct DirectoryContent
  {
    long LastDiskTime;
    std::set<std::string> All;
    std::set<std::string> Generated;
    DirectoryContent(): LastDiskTime(-1) {}
    DirectoryContent(DirectoryContent const& dc):
      LastDiskTime(dc.LastDiskTime), All(dc.All), Generated(dc.Generated) {}
  };
  std::map<std::string, DirectoryContent> DirectoryContentMap;

  // Set of binary directories on disk.
  std::set<std::string> BinaryDirectories;

  // track targets to issue CMP0042 warning for.
  std::set<std::string> CMP0042WarnTargets;

  mutable std::map<cmSourceFile*, std::set<cmTarget const*> >
  FilenameTargetDepends;

#if defined(CMAKE_BUILD_WITH_CMAKE)
  // Pool of file locks
  cmFileLockPool FileLockPool;
#endif
};

#endif