/*============================================================================
  CMake - Cross Platform Makefile Generator
  Copyright 2011 Peter Collingbourne <peter@pcc.me.uk>
  Copyright 2011 Nicolas Despres <nicolas.despres@gmail.com>

  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 cmGlobalNinjaGenerator_h
#define cmGlobalNinjaGenerator_h

#include <cmConfigure.h>

#include "cmGlobalCommonGenerator.h"
#include "cmGlobalGenerator.h"
#include "cmGlobalGeneratorFactory.h"
#include "cmNinjaTypes.h"
#include "cmPolicies.h"

#include <iosfwd>
#include <map>
#include <set>
#include <string>
#include <utility>
#include <vector>

class cmCustomCommand;
class cmMakefile;
class cmake;
struct cmDocumentationEntry;
class cmGeneratedFileStream;
class cmGeneratorTarget;
class cmLocalGenerator;

/**
 * \class cmGlobalNinjaGenerator
 * \brief Write a build.ninja file.
 *
 * The main differences between this generator and the UnixMakefile
 * generator family are:
 * - We don't care about VERBOSE variable or RULE_MESSAGES property since
 *   it is handle by Ninja's -v option.
 * - We don't care about computing any progress status since Ninja manages
 *   it itself.
 * - We don't care about generating a clean target since Ninja already have
 *   a clean tool.
 * - We generate one build.ninja and one rules.ninja per project.
 * - We try to minimize the number of generated rules: one per target and
 *   language.
 * - We use Ninja special variable $in and $out to produce nice output.
 * - We extensively use Ninja variable overloading system to minimize the
 *   number of generated rules.
 */
class cmGlobalNinjaGenerator : public cmGlobalCommonGenerator
{
public:
  /// The default name of Ninja's build file. Typically: build.ninja.
  static const char* NINJA_BUILD_FILE;

  /// The default name of Ninja's rules file. Typically: rules.ninja.
  /// It is included in the main build.ninja file.
  static const char* NINJA_RULES_FILE;

  /// The indentation string used when generating Ninja's build file.
  static const char* INDENT;

  /// Write @a count times INDENT level to output stream @a os.
  static void Indent(std::ostream& os, int count);

  /// Write a divider in the given output stream @a os.
  static void WriteDivider(std::ostream& os);

  static std::string EncodeRuleName(std::string const& name);
  static std::string EncodeIdent(const std::string& ident, std::ostream& vars);
  static std::string EncodeLiteral(const std::string& lit);
  std::string EncodePath(const std::string& path);
  static std::string EncodeDepfileSpace(const std::string& path);

  /**
   * Write the given @a comment to the output stream @a os. It
   * handles new line character properly.
   */
  static void WriteComment(std::ostream& os, const std::string& comment);

  /**
   * Utilized by the generator factory to determine if this generator
   * supports toolsets.
   */
  static bool SupportsToolset() { return false; }

  /**
   * Utilized by the generator factory to determine if this generator
   * supports platforms.
   */
  static bool SupportsPlatform() { return false; }

  /**
   * Write a build statement to @a os with the @a comment using
   * the @a rule the list of @a outputs files and inputs.
   * It also writes the variables bound to this build statement.
   * @warning no escaping of any kind is done here.
   */
  void WriteBuild(std::ostream& os, const std::string& comment,
                  const std::string& rule, const cmNinjaDeps& outputs,
                  const cmNinjaDeps& implicitOuts,
                  const cmNinjaDeps& explicitDeps,
                  const cmNinjaDeps& implicitDeps,
                  const cmNinjaDeps& orderOnlyDeps,
                  const cmNinjaVars& variables,
                  const std::string& rspfile = std::string(),
                  int cmdLineLimit = 0, bool* usedResponseFile = CM_NULLPTR);

  /**
   * Helper to write a build statement with the special 'phony' rule.
   */
  void WritePhonyBuild(std::ostream& os, const std::string& comment,
                       const cmNinjaDeps& outputs,
                       const cmNinjaDeps& explicitDeps,
                       const cmNinjaDeps& implicitDeps = cmNinjaDeps(),
                       const cmNinjaDeps& orderOnlyDeps = cmNinjaDeps(),
                       const cmNinjaVars& variables = cmNinjaVars());

  void WriteCustomCommandBuild(const std::string& command,
                               const std::string& description,
                               const std::string& comment,
                               const std::string& depfile, bool uses_terminal,
                               bool restat, const cmNinjaDeps& outputs,
                               const cmNinjaDeps& deps = cmNinjaDeps(),
                               const cmNinjaDeps& orderOnly = cmNinjaDeps());
  void WriteMacOSXContentBuild(const std::string& input,
                               const std::string& output);

  /**
   * Write a rule statement named @a name to @a os with the @a comment,
   * the mandatory @a command, the @a depfile and the @a description.
   * It also writes the variables bound to this rule statement.
   * @warning no escaping of any kind is done here.
   */
  static void WriteRule(std::ostream& os, const std::string& name,
                        const std::string& command,
                        const std::string& description,
                        const std::string& comment, const std::string& depfile,
                        const std::string& deptype, const std::string& rspfile,
                        const std::string& rspcontent,
                        const std::string& restat, bool generator);

  /**
   * Write a variable named @a name to @a os with value @a value and an
   * optional @a comment. An @a indent level can be specified.
   * @warning no escaping of any kind is done here.
   */
  static void WriteVariable(std::ostream& os, const std::string& name,
                            const std::string& value,
                            const std::string& comment = "", int indent = 0);

  /**
   * Write an include statement including @a filename with an optional
   * @a comment to the @a os stream.
   */
  static void WriteInclude(std::ostream& os, const std::string& filename,
                           const std::string& comment = "");

  /**
   * Write a default target statement specifying @a targets as
   * the default targets.
   */
  static void WriteDefault(std::ostream& os, const cmNinjaDeps& targets,
                           const std::string& comment = "");

  bool IsGCCOnWindows() const { return UsingGCCOnWindows; }

public:
  cmGlobalNinjaGenerator(cmake* cm);

  static cmGlobalGeneratorFactory* NewFactory()
  {
    return new cmGlobalGeneratorSimpleFactory<cmGlobalNinjaGenerator>();
  }

  ~cmGlobalNinjaGenerator() CM_OVERRIDE {}

  cmLocalGenerator* CreateLocalGenerator(cmMakefile* mf) CM_OVERRIDE;

  std::string GetName() const CM_OVERRIDE
  {
    return cmGlobalNinjaGenerator::GetActualName();
  }

  static std::string GetActualName() { return "Ninja"; }

  static void GetDocumentation(cmDocumentationEntry& entry);

  void EnableLanguage(std::vector<std::string> const& languages,
                      cmMakefile* mf, bool optional) CM_OVERRIDE;

  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>()) CM_OVERRIDE;

  // Setup target names
  const char* GetAllTargetName() const CM_OVERRIDE { return "all"; }
  const char* GetInstallTargetName() const CM_OVERRIDE { return "install"; }
  const char* GetInstallLocalTargetName() const CM_OVERRIDE
  {
    return "install/local";
  }
  const char* GetInstallStripTargetName() const CM_OVERRIDE
  {
    return "install/strip";
  }
  const char* GetTestTargetName() const CM_OVERRIDE { return "test"; }
  const char* GetPackageTargetName() const CM_OVERRIDE { return "package"; }
  const char* GetPackageSourceTargetName() const CM_OVERRIDE
  {
    return "package_source";
  }
  const char* GetEditCacheTargetName() const CM_OVERRIDE
  {
    return "edit_cache";
  }
  const char* GetRebuildCacheTargetName() const CM_OVERRIDE
  {
    return "rebuild_cache";
  }
  const char* GetCleanTargetName() const CM_OVERRIDE { return "clean"; }

  cmGeneratedFileStream* GetBuildFileStream() const
  {
    return this->BuildFileStream;
  }

  cmGeneratedFileStream* GetRulesFileStream() const
  {
    return this->RulesFileStream;
  }

  std::string ConvertToNinjaPath(const std::string& path);
  std::string ConvertToNinjaFolderRule(const std::string& path);

  struct MapToNinjaPathImpl
  {
    cmGlobalNinjaGenerator* GG;
    MapToNinjaPathImpl(cmGlobalNinjaGenerator* gg)
      : GG(gg)
    {
    }
    std::string operator()(std::string const& path)
    {
      return this->GG->ConvertToNinjaPath(path);
    }
  };
  MapToNinjaPathImpl MapToNinjaPath() { return MapToNinjaPathImpl(this); }

  void AddCXXCompileCommand(const std::string& commandLine,
                            const std::string& sourceFile);

  /**
   * Add a rule to the generated build system.
   * Call WriteRule() behind the scene but perform some check before like:
   * - Do not add twice the same rule.
   */
  void AddRule(const std::string& name, const std::string& command,
               const std::string& description, const std::string& comment,
               const std::string& depfile, const std::string& deptype,
               const std::string& rspfile, const std::string& rspcontent,
               const std::string& restat, bool generator);

  bool HasRule(const std::string& name);

  void AddCustomCommandRule();
  void AddMacOSXContentRule();

  bool HasCustomCommandOutput(const std::string& output)
  {
    return this->CustomCommandOutputs.find(output) !=
      this->CustomCommandOutputs.end();
  }

  /// Called when we have seen the given custom command.  Returns true
  /// if we has seen it before.
  bool SeenCustomCommand(cmCustomCommand const* cc)
  {
    return !this->CustomCommands.insert(cc).second;
  }

  /// Called when we have seen the given custom command output.
  void SeenCustomCommandOutput(const std::string& output)
  {
    this->CustomCommandOutputs.insert(output);
    // We don't need the assumed dependencies anymore, because we have
    // an output.
    this->AssumedSourceDependencies.erase(output);
  }

  void AddAssumedSourceDependencies(const std::string& source,
                                    const cmNinjaDeps& deps)
  {
    std::set<std::string>& ASD = this->AssumedSourceDependencies[source];
    // Because we may see the same source file multiple times (same source
    // specified in multiple targets), compute the union of any assumed
    // dependencies.
    ASD.insert(deps.begin(), deps.end());
  }

  void AppendTargetOutputs(cmGeneratorTarget const* target,
                           cmNinjaDeps& outputs);
  void AppendTargetDepends(cmGeneratorTarget const* target,
                           cmNinjaDeps& outputs);
  void AppendTargetDependsClosure(cmGeneratorTarget const* target,
                                  cmNinjaDeps& outputs);
  void AddDependencyToAll(cmGeneratorTarget* target);
  void AddDependencyToAll(const std::string& input);

  const std::vector<cmLocalGenerator*>& GetLocalGenerators() const
  {
    return LocalGenerators;
  }

  bool IsExcluded(cmLocalGenerator* root, cmGeneratorTarget* target)
  {
    return cmGlobalGenerator::IsExcluded(root, target);
  }

  int GetRuleCmdLength(const std::string& name) { return RuleCmdLength[name]; }

  void AddTargetAlias(const std::string& alias, cmGeneratorTarget* target);

  void ComputeTargetObjectDirectory(cmGeneratorTarget* gt) const CM_OVERRIDE;

  // Ninja generator uses 'deps' and 'msvc_deps_prefix' introduced in 1.3
  static std::string RequiredNinjaVersion() { return "1.3"; }
  static std::string RequiredNinjaVersionForConsolePool() { return "1.5"; }
  static std::string RequiredNinjaVersionForImplicitOuts() { return "1.7"; }
  bool SupportsConsolePool() const;
  bool SupportsImplicitOuts() const;

  std::string NinjaOutputPath(std::string const& path);
  bool HasOutputPathPrefix() const { return !this->OutputPathPrefix.empty(); }
  void StripNinjaOutputPathPrefixAsSuffix(std::string& path);

  bool WriteDyndepFile(std::string const& dir_top_src,
                       std::string const& dir_top_bld,
                       std::string const& dir_cur_src,
                       std::string const& dir_cur_bld,
                       std::string const& arg_dd,
                       std::vector<std::string> const& arg_ddis,
                       std::string const& module_dir,
                       std::vector<std::string> const& linked_target_dirs);

protected:
  void Generate() CM_OVERRIDE;

  bool CheckALLOW_DUPLICATE_CUSTOM_TARGETS() const CM_OVERRIDE { return true; }

private:
  std::string GetEditCacheCommand() const CM_OVERRIDE;
  void FindMakeProgram(cmMakefile* mf) CM_OVERRIDE;
  void CheckNinjaFeatures();
  bool CheckLanguages(std::vector<std::string> const& languages,
                      cmMakefile* mf) const CM_OVERRIDE;
  bool CheckFortran(cmMakefile* mf) const;

  void OpenBuildFileStream();
  void CloseBuildFileStream();

  void CloseCompileCommandsStream();

  void OpenRulesFileStream();
  void CloseRulesFileStream();

  /// Write the common disclaimer text at the top of each build file.
  void WriteDisclaimer(std::ostream& os);

  void WriteAssumedSourceDependencies();

  void WriteTargetAliases(std::ostream& os);
  void WriteFolderTargets(std::ostream& os);
  void WriteUnknownExplicitDependencies(std::ostream& os);

  void WriteBuiltinTargets(std::ostream& os);
  void WriteTargetAll(std::ostream& os);
  void WriteTargetRebuildManifest(std::ostream& os);
  void WriteTargetClean(std::ostream& os);
  void WriteTargetHelp(std::ostream& os);

  void ComputeTargetDependsClosure(
    cmGeneratorTarget const* target,
    std::set<cmGeneratorTarget const*>& depends);

  std::string ninjaCmd() const;

  /// The file containing the build statement. (the relationship of the
  /// compilation DAG).
  cmGeneratedFileStream* BuildFileStream;
  /// The file containing the rule statements. (The action attached to each
  /// edge of the compilation DAG).
  cmGeneratedFileStream* RulesFileStream;
  cmGeneratedFileStream* CompileCommandsStream;

  /// The type used to store the set of rules added to the generated build
  /// system.
  typedef std::set<std::string> RulesSetType;

  /// The set of rules added to the generated build system.
  RulesSetType Rules;

  /// Length of rule command, used by rsp file evaluation
  std::map<std::string, int> RuleCmdLength;

  /// The set of dependencies to add to the "all" target.
  cmNinjaDeps AllDependencies;

  bool UsingGCCOnWindows;

  /// The set of custom commands we have seen.
  std::set<cmCustomCommand const*> CustomCommands;

  /// The set of custom command outputs we have seen.
  std::set<std::string> CustomCommandOutputs;

  /// Whether we are collecting known build outputs and needed
  /// dependencies to determine unknown dependencies.
  bool ComputingUnknownDependencies;
  cmPolicies::PolicyStatus PolicyCMP0058;

  /// The combined explicit dependencies of custom build commands
  std::set<std::string> CombinedCustomCommandExplicitDependencies;

  /// When combined with CombinedCustomCommandExplicitDependencies it allows
  /// us to detect the set of explicit dependencies that have
  std::set<std::string> CombinedBuildOutputs;

  /// The mapping from source file to assumed dependencies.
  std::map<std::string, std::set<std::string> > AssumedSourceDependencies;

  typedef std::map<std::string, cmGeneratorTarget*> TargetAliasMap;
  TargetAliasMap TargetAliases;

  typedef std::map<cmGeneratorTarget const*,
                   std::set<cmGeneratorTarget const*> >
    TargetDependsClosureMap;
  TargetDependsClosureMap TargetDependsClosures;

  std::string NinjaCommand;
  std::string NinjaVersion;
  bool NinjaSupportsConsolePool;
  bool NinjaSupportsImplicitOuts;
  unsigned long NinjaSupportsDyndeps;

private:
  void InitOutputPathPrefix();

  std::string OutputPathPrefix;
  std::string TargetAll;
  std::string CMakeCacheFile;
};

#endif // ! cmGlobalNinjaGenerator_h