/* Distributed under the OSI-approved BSD 3-Clause License.  See accompanying

   file LICENSE.rst or https://cmake.org/licensing for details.  */

#pragma once

#include "cmConfigure.h" // IWYU pragma: keep

#include <iosfwd>

#include <map>

#include <set>

#include <string>

#include <vector>

#include <cm/string_view>

#include "cmGeneratorExpression.h"

#include "cmMessageType.h"

class cmExportSet;

class cmGeneratorTarget;

class cmLocalGenerator;

/** \class cmExportFileGenerator

 * \brief Generate files exporting targets from a build or install tree.

 *

 * cmExportFileGenerator is the interface class for generating export files.

 */

class cmExportFileGenerator

{

public:

  cmExportFileGenerator();

  virtual ~cmExportFileGenerator() = default;

  /** Set the full path to the export file to generate.  */

  void SetExportFile(char const* mainFile);

  std::string const& GetMainExportFileName() const;

  /** Set the namespace in which to place exported target names.  */

  void SetNamespace(std::string const& ns) { this->Namespace = ns; }

  std::string GetNamespace() const { return this->Namespace; }

  /** Add a configuration to be exported.  */

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

  /** Create and actually generate the export file.  Returns whether there was

      an error.  */

  bool GenerateImportFile();

protected:

  using ImportPropertyMap = std::map<std::string, std::string>;

  // Collect properties with detailed information about targets beyond

  // their location on disk.

  void SetImportDetailProperties(std::string const& config,

                                 std::string const& suffix,

                                 cmGeneratorTarget const* target,

                                 ImportPropertyMap& properties);

  enum class ImportLinkPropertyTargetNames

  {

    Yes,

    No,

  };

  template <typename T>

  void SetImportLinkProperty(std::string const& suffix,

                             cmGeneratorTarget const* target,

                             std::string const& propName,

                             std::vector<T> const& entries,

                             ImportPropertyMap& properties,

                             ImportLinkPropertyTargetNames targetNames);

  /** Generate the export file to the given output stream.  Returns whether

      there was an error.  */

  virtual bool GenerateImportFile(std::ostream& os) = 0;

  /** Each subclass knows how to generate its kind of export file.  */

  virtual bool GenerateMainFile(std::ostream& os) = 0;

  /** Generate per-configuration target information to the given output

      stream.  */

  virtual void GenerateImportConfig(std::ostream& os,

                                    std::string const& config);

  /** Each subclass knows where the target files are located.  */

  virtual void GenerateImportTargetsConfig(std::ostream& os,

                                           std::string const& config,

                                           std::string const& suffix) = 0;

  /** Record a target referenced by an exported target. */

  virtual bool NoteLinkedTarget(cmGeneratorTarget const* target,

                                std::string const& linkedName,

                                cmGeneratorTarget const* linkedTarget);

  /** Each subclass knows how to deal with a target that is  missing from an

   *  export set.  */

  virtual void HandleMissingTarget(std::string& link_libs,

                                   cmGeneratorTarget const* depender,

                                   cmGeneratorTarget* dependee) = 0;

  /** Complain when a duplicate target is encountered.  */

  virtual void ComplainAboutDuplicateTarget(

    std::string const& targetName) const = 0;

  virtual cm::string_view GetImportPrefixWithSlash() const = 0;

  void AddImportPrefix(std::string& exportDirs) const;

  void PopulateInterfaceProperty(std::string const& propName,

                                 cmGeneratorTarget const* target,

                                 ImportPropertyMap& properties) const;

  void PopulateInterfaceProperty(std::string const& propName,

                                 cmGeneratorTarget const* target,

                                 cmGeneratorExpression::PreprocessContext,

                                 ImportPropertyMap& properties);

  bool PopulateInterfaceLinkLibrariesProperty(

    cmGeneratorTarget const* target, cmGeneratorExpression::PreprocessContext,

    ImportPropertyMap& properties);

  bool PopulateInterfaceProperties(

    cmGeneratorTarget const* target,

    std::string const& includesDestinationDirs,

    cmGeneratorExpression::PreprocessContext preprocessRule,

    ImportPropertyMap& properties);

  virtual void IssueMessage(MessageType type,

                            std::string const& message) const = 0;

  void ReportError(std::string const& errorMessage) const

  {

    this->IssueMessage(MessageType::FATAL_ERROR, errorMessage);

  }

  struct ExportInfo

  {

    std::vector<std::string> Files;

    std::set<std::string> Sets;

    std::set<std::string> Namespaces;

  };

  /** Find the set of export files and the unique namespace (if any) for a

   *  target. */

  virtual ExportInfo FindExportInfo(cmGeneratorTarget const* target) const = 0;

  enum FreeTargetsReplace

  {

    ReplaceFreeTargets,

    NoReplaceFreeTargets

  };

  void ResolveTargetsInGeneratorExpressions(

    std::string& input, cmGeneratorTarget const* target,

    FreeTargetsReplace replace = NoReplaceFreeTargets);

  virtual cmExportSet* GetExportSet() const { return nullptr; }

  virtual void ReplaceInstallPrefix(std::string& input) const;

  virtual std::string InstallNameDir(cmGeneratorTarget const* target,

                                     std::string const& config) = 0;

  /** Get the temporary location of the config-agnostic C++ module file.  */

  virtual std::string GetCxxModuleFile(std::string const& name) const = 0;

  virtual std::string GetCxxModulesDirectory() const = 0;

  virtual void GenerateCxxModuleConfigInformation(std::string const&,

                                                  std::ostream& os) const = 0;

  bool AddTargetNamespace(std::string& input, cmGeneratorTarget const* target,

                          cmLocalGenerator const* lg);

  static std::string PropertyConfigSuffix(std::string const& config);

  // The namespace in which the exports are placed in the generated file.

  std::string Namespace;

  // The set of configurations to export.

  std::vector<std::string> Configurations;

  // The file to generate.

  std::string MainImportFile;

  std::string FileDir;

  std::string FileBase;

  std::string FileExt;

  bool AppendMode = false;

  // The set of targets included in the export.

  std::set<cmGeneratorTarget const*> ExportedTargets;

  std::vector<std::string> MissingTargets;

  std::set<cmGeneratorTarget const*> ExternalTargets;

private:

  void PopulateInterfaceProperty(std::string const& propName,

                                 std::string const& outputName,

                                 cmGeneratorTarget const* target,

                                 cmGeneratorExpression::PreprocessContext,

                                 ImportPropertyMap& properties);

  void PopulateCompatibleInterfaceProperties(

    cmGeneratorTarget const* target, ImportPropertyMap& properties) const;

  void PopulateCustomTransitiveInterfaceProperties(

    cmGeneratorTarget const* target,

    cmGeneratorExpression::PreprocessContext preprocessRule,

    ImportPropertyMap& properties);

  bool PopulateCxxModuleExportProperties(

    cmGeneratorTarget const* gte, ImportPropertyMap& properties,

    cmGeneratorExpression::PreprocessContext ctx,

    std::string const& includesDestinationDirs, std::string& errorMessage);

  bool PopulateExportProperties(cmGeneratorTarget const* gte,

                                ImportPropertyMap& properties,

                                std::string& errorMessage) const;

  void ResolveTargetsInGeneratorExpression(std::string& input,

                                           cmGeneratorTarget const* target,

                                           cmLocalGenerator const* lg);

};

extern template void cmExportFileGenerator::SetImportLinkProperty<std::string>(

  std::string const&, cmGeneratorTarget const*, std::string const&,

  std::vector<std::string> const&, ImportPropertyMap& properties,

  ImportLinkPropertyTargetNames);

extern template void cmExportFileGenerator::SetImportLinkProperty<cmLinkItem>(

  std::string const&, cmGeneratorTarget const*, std::string const&,

  std::vector<cmLinkItem> const&, ImportPropertyMap& properties,

  ImportLinkPropertyTargetNames);