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

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

#include "cmFileAPIToolchains.h"

#include <memory>

#include <string>

#include <vector>

#include <cm3p/json/value.h>

#include "cmFileAPI.h"

#include "cmGlobalGenerator.h"

#include "cmList.h"

#include "cmMakefile.h"

#include "cmState.h"

#include "cmStringAlgorithms.h"

#include "cmValue.h"

#include "cmake.h"

namespace {

struct ToolchainVariable

{

  std::string ObjectKey;

  std::string VariableSuffix;

  bool IsList;

  bool OmitEmpty;

};

class Toolchains

{

  cmFileAPI& FileAPI;

  unsigned int Version;

  Json::Value DumpToolchains();

  Json::Value DumpToolchain(std::string const& lang);

  Json::Value DumpToolchainVariables(

    cmMakefile const* mf, std::string const& lang,

    std::vector<ToolchainVariable> const& variables);

  void DumpToolchainVariable(cmMakefile const* mf, Json::Value& object,

                             std::string const& lang,

                             ToolchainVariable const& variable);

public:

  Toolchains(cmFileAPI& fileAPI, unsigned int version);

  Json::Value Dump();

};

Toolchains::Toolchains(cmFileAPI& fileAPI, unsigned int version)

  : FileAPI(fileAPI)

  , Version(version)

{

  static_cast<void>(this->Version);

}

Json::Value Toolchains::Dump()

{

  Json::Value toolchains = Json::objectValue;

  toolchains["toolchains"] = this->DumpToolchains();

  return toolchains;

}

Json::Value Toolchains::DumpToolchains()

{

  Json::Value toolchains = Json::arrayValue;

  for (std::string const& lang :

       this->FileAPI.GetCMakeInstance()->GetState()->GetEnabledLanguages()) {

    toolchains.append(this->DumpToolchain(lang));

  }

  return toolchains;

}

Json::Value Toolchains::DumpToolchain(std::string const& lang)

{

  static std::vector<ToolchainVariable> const CompilerVariables{

    { "path", "COMPILER", false, false },

    { "commandFragment", "COMPILER_ARG1", false, true },

    { "id", "COMPILER_ID", false, false },

    { "version", "COMPILER_VERSION", false, false },

    { "target", "COMPILER_TARGET", false, false },

  };

  static std::vector<ToolchainVariable> const CompilerImplicitVariables{

    { "includeDirectories", "IMPLICIT_INCLUDE_DIRECTORIES", true, false },

    { "linkDirectories", "IMPLICIT_LINK_DIRECTORIES", true, false },

    { "linkFrameworkDirectories", "IMPLICIT_LINK_FRAMEWORK_DIRECTORIES", true,

      false },

    { "linkLibraries", "IMPLICIT_LINK_LIBRARIES", true, false },

  };

  static ToolchainVariable const SourceFileExtensionsVariable{

    "sourceFileExtensions", "SOURCE_FILE_EXTENSIONS", true, false

  };

  auto const& mf =

    this->FileAPI.GetCMakeInstance()->GetGlobalGenerator()->GetMakefiles()[0];

  Json::Value toolchain = Json::objectValue;

  toolchain["language"] = lang;

  toolchain["compiler"] =

    this->DumpToolchainVariables(mf.get(), lang, CompilerVariables);

  toolchain["compiler"]["implicit"] =

    this->DumpToolchainVariables(mf.get(), lang, CompilerImplicitVariables);

  this->DumpToolchainVariable(mf.get(), toolchain, lang,

                              SourceFileExtensionsVariable);

  return toolchain;

}

Json::Value Toolchains::DumpToolchainVariables(

  cmMakefile const* mf, std::string const& lang,

  std::vector<ToolchainVariable> const& variables)

{

  Json::Value object = Json::objectValue;

  for (auto const& variable : variables) {

    this->DumpToolchainVariable(mf, object, lang, variable);

  }

  return object;

}

void Toolchains::DumpToolchainVariable(cmMakefile const* mf,

                                       Json::Value& object,

                                       std::string const& lang,

                                       ToolchainVariable const& variable)

{

  std::string const variableName =

    cmStrCat("CMAKE_", lang, '_', variable.VariableSuffix);

  if (variable.IsList) {

    cmValue data = mf->GetDefinition(variableName);

    if (data) {

      cmList values(data);

      if (!variable.OmitEmpty || !values.empty()) {

        Json::Value jsonArray = Json::arrayValue;

        for (auto const& value : values) {

          jsonArray.append(value);

        }

        object[variable.ObjectKey] = jsonArray;

      }

    }

  } else {

    cmValue def = mf->GetDefinition(variableName);

    if (def && (!variable.OmitEmpty || !def.IsEmpty())) {

      object[variable.ObjectKey] = *def;

    }

  }

}

}

Json::Value cmFileAPIToolchainsDump(cmFileAPI& fileAPI, unsigned int version)

{

  Toolchains toolchains(fileAPI, version);

  return toolchains.Dump();

}