//===- TapiUniversal.cpp --------------------------------------------------===//
//
// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
// See https://llvm.org/LICENSE.txt for license information.
// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
//
//===----------------------------------------------------------------------===//
//
// This file defines the Text-based Dynamic Library Stub format.
//
//===----------------------------------------------------------------------===//

#include "llvm/Object/TapiUniversal.h"
#include "llvm/ADT/StringRef.h"
#include "llvm/Object/TapiFile.h"
#include "llvm/TextAPI/TextAPIReader.h"

using namespace llvm;
using namespace MachO;
using namespace object;

TapiUniversal::TapiUniversal(MemoryBufferRef Source, Error &Err)
    : Binary(ID_TapiUniversal, Source) {
  Expected<std::unique_ptr<InterfaceFile>> Result = TextAPIReader::get(Source);
  ErrorAsOutParameter ErrAsOuParam(Err);
  if (!Result) {
    Err = Result.takeError();
    return;
  }
  ParsedFile = std::move(Result.get());

  auto FlattenObjectInfo = [this](const auto &File,
                                  std::optional<size_t> DocIdx = std::nullopt) {
    StringRef Name = File->getInstallName();
    for (const Architecture Arch : File->getArchitectures())
      Libraries.emplace_back(Library({Name, Arch, DocIdx}));
  };
  FlattenObjectInfo(ParsedFile);
  // Get inlined documents from tapi file.
  size_t DocIdx = 0;
  for (const std::shared_ptr<InterfaceFile> &File : ParsedFile->documents())
    FlattenObjectInfo(File, DocIdx++);
}

TapiUniversal::~TapiUniversal() = default;

Expected<std::unique_ptr<TapiFile>>
TapiUniversal::ObjectForArch::getAsObjectFile() const {
  const auto &InlinedDocuments = Parent->ParsedFile->documents();
  const Library &CurrLib = Parent->Libraries[Index];
  assert(
      (isTopLevelLib() || (CurrLib.DocumentIdx.has_value() &&
                           (InlinedDocuments.size() > *CurrLib.DocumentIdx))) &&
      "Index into documents exceeds the container for them");
  InterfaceFile *IF = isTopLevelLib()
                          ? Parent->ParsedFile.get()
                          : InlinedDocuments[*CurrLib.DocumentIdx].get();
  return std::make_unique<TapiFile>(Parent->getMemoryBufferRef(), *IF,
                                    CurrLib.Arch);
}

Expected<std::unique_ptr<TapiUniversal>>
TapiUniversal::create(MemoryBufferRef Source) {
  Error Err = Error::success();
  std::unique_ptr<TapiUniversal> Ret(new TapiUniversal(Source, Err));
  if (Err)
    return std::move(Err);
  return std::move(Ret);
}