/* 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 <cstddef>
#include <functional>
#include <map>
#include <memory>
#include <set>
#include <string>
#include <utility>
#include <vector>

#include <cm/string_view>

#include <cm3p/kwiml/int.h>

#include "cmFindCommon.h"
#include "cmPackageInfoReader.h"
#include "cmPolicies.h"

// IWYU insists we should forward-declare instead of including <functional>,
// but we cannot forward-declare reliably because some C++ standard libraries
// put the template in an inline namespace.
#ifdef CMAKE_IWYU_FORWARD_STD_HASH
/* clang-format off */
namespace std {
  template <class T> struct hash;
}
/* clang-format on */
#endif

class cmConfigureLog;
class cmExecutionStatus;
class cmMakefile;
class cmPackageState;
class cmSearchPath;
class cmPackageInformation;

/** \class cmFindPackageCommand
 * \brief Load settings from an external project.
 *
 * cmFindPackageCommand
 */
class cmFindPackageCommand : public cmFindCommon
{
public:
  /*! A sorting order strategy to be applied to recovered package folders (see
   * FIND_PACKAGE_SORT_ORDER)*/
  enum /*class*/ SortOrderType
  {
    None,
    Name_order,
    Natural
  };
  /*! A sorting direction to be applied to recovered package folders (see
   * FIND_PACKAGE_SORT_DIRECTION)*/
  enum /*class*/ SortDirectionType
  {
    Asc,
    Dec
  };

  enum class PackageDescriptionType
  {
    Any,
    CMake,
    Cps,
  };

  /*! sorts a given list of string based on the input sort parameters */
  static void Sort(std::vector<std::string>::iterator begin,
                   std::vector<std::string>::iterator end, SortOrderType order,
                   SortDirectionType dir);

  cmFindPackageCommand(cmExecutionStatus& status);
  ~cmFindPackageCommand() override;

  bool InitialPass(std::vector<std::string> const& args);

private:
  class PathLabel : public cmFindCommon::PathLabel
  {
  protected:
    PathLabel();

  public:
    PathLabel(std::string const& label)
      : cmFindCommon::PathLabel(label)
    {
    }
    static PathLabel PackageRedirect;
    static PathLabel UserRegistry;
    static PathLabel Builds;
    static PathLabel SystemRegistry;
  };

  void InheritOptions(cmFindPackageCommand* other);

  bool IsFound() const override;
  bool IsDefined() const override;

  // Try to find a package, assuming most state has already been set up. This
  // is used for recursive dependency solving, particularly when importing
  // packages via CPS. Bypasses providers if argsForProvider is empty.
  bool FindPackage(std::vector<std::string> const& argsForProvider = {});

  bool FindPackageUsingModuleMode();
  bool FindPackageUsingConfigMode();

  // Add additional search path labels and groups not present in the
  // parent class
  void AppendSearchPathGroups();

  void AppendSuccessInformation();
  void AppendToFoundProperty(bool found);
  void SetVersionVariables(
    std::function<void(std::string const&, cm::string_view)> const&
      addDefinition,
    std::string const& prefix, std::string const& version, unsigned int count,
    unsigned int major, unsigned int minor, unsigned int patch,
    unsigned int tweak);
  void SetModuleVariables();
  bool FindModule(bool& found);
  void AddFindDefinition(std::string const& var, cm::string_view value);
  void RestoreFindDefinitions();

  class SetRestoreFindDefinitions;

  enum /*class*/ HandlePackageModeType
  {
    Module,
    Config
  };
  bool HandlePackageMode(HandlePackageModeType type);

  bool FindConfig();
  bool FindPrefixedConfig();
  bool FindFrameworkConfig();
  bool FindAppBundleConfig();
  bool FindEnvironmentConfig();
  enum PolicyScopeRule
  {
    NoPolicyScope,
    DoPolicyScope
  };
  bool ReadListFile(std::string const& f, PolicyScopeRule psr);
  bool ReadPackage();

  struct Appendix
  {
    std::unique_ptr<cmPackageInfoReader> Reader;
    std::vector<std::string> Components;

    operator cmPackageInfoReader&() const { return *this->Reader; }
  };
  using AppendixMap = std::map<std::string, Appendix>;
  AppendixMap FindAppendices(std::string const& base,
                             cmPackageInfoReader const& baseReader) const;
  enum RequiredStatus
  {
    Optional,
    OptionalExplicit,
    RequiredExplicit,
    RequiredFromPackageVar,
    RequiredFromFindVar
  };
  bool FindPackageDependencies(std::string const& filePath,
                               cmPackageInfoReader const& reader,
                               RequiredStatus required);

  bool ImportPackageTargets(cmPackageState& packageState,
                            std::string const& filePath,
                            cmPackageInfoReader& reader);
  void StoreVersionFound();
  void SetConfigDirCacheVariable(std::string const& value);

  void PushFindPackageRootPathStack();
  void PopFindPackageRootPathStack();
  class PushPopRootPathStack;

  enum class FoundPackageMode
  {
    None,
    Module,
    // Do not implicitly log for prior package types.
    Config,
    Cps,
    Provider,
  };
  void ComputePrefixes();
  void FillPrefixesPackageRedirect();
  void FillPrefixesPackageRoot();
  void FillPrefixesCMakeEnvironment();
  void FillPrefixesCMakeVariable();
  void FillPrefixesSystemEnvironment();
  void FillPrefixesUserRegistry();
  void FillPrefixesSystemRegistry();
  void FillPrefixesCMakeSystemVariable();
  void FillPrefixesUserGuess();
  void FillPrefixesUserHints();
  void LoadPackageRegistryDir(std::string const& dir, cmSearchPath& outPaths);
  void LoadPackageRegistryWinUser();
  void LoadPackageRegistryWinSystem();
  void LoadPackageRegistryWin(bool user, unsigned int view,
                              cmSearchPath& outPaths);
  bool CheckPackageRegistryEntry(std::string const& fname,
                                 cmSearchPath& outPaths);
  bool SearchDirectory(std::string const& dir, PackageDescriptionType type);
  bool CheckDirectory(std::string const& dir, PackageDescriptionType type);
  bool FindConfigFile(std::string const& dir, PackageDescriptionType type,
                      std::string& file, FoundPackageMode& foundMode);
  bool CheckVersion(std::string const& config_file);
  bool CheckVersionFile(std::string const& version_file,
                        std::string& result_version);
  bool SearchPrefix(std::string const& prefix);
  bool SearchFrameworkPrefix(std::string const& prefix);
  bool SearchAppBundlePrefix(std::string const& prefix);
  bool SearchEnvironmentPrefix(std::string const& prefix);

  bool IsRequired() const;

  struct OriginalDef
  {
    bool exists;
    std::string value;
  };
  std::map<std::string, OriginalDef> OriginalDefs;

  std::map<std::string, cmPolicies::PolicyID> DeprecatedFindModules;

  static cm::string_view const VERSION_ENDPOINT_INCLUDED;
  static cm::string_view const VERSION_ENDPOINT_EXCLUDED;

  std::string Name;
  std::string Variable;
  std::string VersionComplete;
  std::string VersionRange;
  cm::string_view VersionRangeMin;
  cm::string_view VersionRangeMax;
  std::string Version;
  unsigned int VersionMajor = 0;
  unsigned int VersionMinor = 0;
  unsigned int VersionPatch = 0;
  unsigned int VersionTweak = 0;
  unsigned int VersionCount = 0;
  std::string VersionMax;
  unsigned int VersionMaxMajor = 0;
  unsigned int VersionMaxMinor = 0;
  unsigned int VersionMaxPatch = 0;
  unsigned int VersionMaxTweak = 0;
  unsigned int VersionMaxCount = 0;
  bool VersionExact = false;
  std::string FileFound;
  FoundPackageMode FileFoundMode = FoundPackageMode::None;
  std::string VersionFound;
  unsigned int VersionFoundMajor = 0;
  unsigned int VersionFoundMinor = 0;
  unsigned int VersionFoundPatch = 0;
  unsigned int VersionFoundTweak = 0;
  unsigned int VersionFoundCount = 0;
  KWIML_INT_uint64_t RequiredCMakeVersion = 0;
  bool BypassProvider = false;
  bool Quiet = false;
  RequiredStatus Required = RequiredStatus::Optional;
  bool UseCpsFiles = false;
  bool UseConfigFiles = true;
  bool UseFindModules = true;
  bool NoUserRegistry = false;
  bool NoSystemRegistry = false;
  bool UseLib32Paths = false;
  bool UseLib64Paths = false;
  bool UseLibx32Paths = false;
  bool UseRealPath = false;
  bool PolicyScope = true;
  bool GlobalScope = false;
  bool RegistryViewDefined = false;
  bool ScopeUnwind = false;
  std::string LibraryArchitecture;
  std::vector<std::string> Names;
  std::set<std::string> IgnoredPaths;
  std::set<std::string> IgnoredPrefixPaths;
  std::string Components;
  std::set<std::string> RequiredComponents;
  std::set<std::string> OptionalComponents;
  std::set<std::string> RequiredTargets;
  std::string DebugBuffer;
  cmPackageInformation* CurrentPackageInfo;

  enum class SearchResult
  {
    InsufficientVersion,
    NoExist,
    Ignored,
    NoConfigFile,
    NotFound,
  };
  struct ConsideredPath
  {
    ConsideredPath(std::string path, FoundPackageMode mode,
                   SearchResult reason)
      : Path(std::move(path))
      , Mode(mode)
      , Reason(reason)
    {
    }

    std::string Path;
    FoundPackageMode Mode;
    SearchResult Reason;
    std::string Message;
  };
  std::vector<ConsideredPath> ConsideredPaths;

  static FoundPackageMode FoundMode(PackageDescriptionType type);

  struct ConfigName
  {
    ConfigName(std::string const& name, PackageDescriptionType type)
      : Name{ name }
      , Type{ type }
    {
    }
    ConfigName(std::string&& name, PackageDescriptionType type)
      : Name{ std::move(name) }
      , Type{ type }
    {
    }
    ConfigName(ConfigName const&) = default;
    ConfigName(ConfigName&&) = default;

    std::string Name;
    PackageDescriptionType Type;
  };
  std::vector<ConfigName> Configs;

  class FlushDebugBufferOnExit;

  /*! the selected sortOrder (Natural by default)*/
  SortOrderType SortOrder = Natural;
  /*! the selected sortDirection (Dec by default)*/
  SortDirectionType SortDirection = Dec;

  struct ConfigFileInfo
  {
    std::string filename;
    std::string version;

    bool operator<(ConfigFileInfo const& rhs) const
    {
      return this->filename < rhs.filename;
    }

    bool operator==(ConfigFileInfo const& rhs) const
    {
      return this->filename == rhs.filename;
    }

    bool operator!=(ConfigFileInfo const& rhs) const
    {
      return !(*this == rhs);
    }
  };
  std::vector<ConfigFileInfo> ConsideredConfigs;

  std::unique_ptr<cmPackageInfoReader> CpsReader;
  AppendixMap CpsAppendices;

  friend struct std::hash<ConfigFileInfo>;
  friend class cmFindPackageDebugState;

  enum class FindState
  {
    Undefined,
    Irrelevant,
    Found,
    NotFound,
  };
  FindState InitialState = FindState::Undefined;
};

namespace std {

template <>
struct hash<cmFindPackageCommand::ConfigFileInfo>
{
  using argument_type = cmFindPackageCommand::ConfigFileInfo;
  using result_type = size_t;

  result_type operator()(argument_type const& s) const noexcept
  {
    result_type const h(std::hash<std::string>{}(s.filename));
    return h;
  }
};
}

bool cmFindPackage(std::vector<std::string> const& args,
                   cmExecutionStatus& status);

class cmFindPackageDebugState : public cmFindCommonDebugState
{
public:
  explicit cmFindPackageDebugState(cmFindPackageCommand const* findPackage);
  ~cmFindPackageDebugState() override;

private:
  void FoundAtImpl(std::string const& path, std::string regexName) override;
  void FailedAtImpl(std::string const& path, std::string regexName) override;
  bool ShouldImplicitlyLogEvents() const override;

  void WriteDebug() const override;
#ifndef CMAKE_BOOTSTRAP
  void WriteEvent(cmConfigureLog& log, cmMakefile const& mf) const override;
  std::vector<std::pair<VariableSource, std::string>> ExtraSearchVariables()
    const override;
#endif

  cmFindPackageCommand const* const FindPackageCommand;
};