//===-- lib/runtime/pseudo-unit.cpp -----------------------------*- C++ -*-===//
//
// 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
//
//===----------------------------------------------------------------------===//
//
// Implemenation of ExternalFileUnit and PseudoOpenFile for
// RT_USE_PSEUDO_FILE_UNIT=1.
//
//===----------------------------------------------------------------------===//

#include "unit.h"
#include "flang-rt/runtime/io-error.h"
#include "flang-rt/runtime/tools.h"

// NOTE: the header files above may define OpenMP declare target
// variables, so they have to be included unconditionally
// so that the offload entries are consistent between host and device.
#if defined(RT_USE_PSEUDO_FILE_UNIT)
#include <cstdio>

namespace Fortran::runtime::io {

void FlushOutputOnCrash(const Terminator &) {}

ExternalFileUnit *ExternalFileUnit::LookUp(int, Terminator &terminator) {
  terminator.Crash("%s: unsupported", RT_PRETTY_FUNCTION);
}

ExternalFileUnit *ExternalFileUnit::LookUpOrCreate(
    int, const Terminator &terminator, bool &) {
  terminator.Crash("%s: unsupported", RT_PRETTY_FUNCTION);
}

ExternalFileUnit *ExternalFileUnit::LookUpOrCreateAnonymous(int unit,
    Direction direction, common::optional<bool>, IoErrorHandler &handler) {
  if (direction != Direction::Output || unit != 6) {
    handler.Crash("ExternalFileUnit only supports output to unit 6");
  }
  // The pseudo-unit allocated here will be released in
  // ExternalIoStatementBase::EndIoStatement().
  return New<ExternalFileUnit>{handler}(unit).release();
}

ExternalFileUnit *ExternalFileUnit::LookUp(
    const char *, std::size_t, Terminator &terminator) {
  terminator.Crash("%s: unsupported", RT_PRETTY_FUNCTION);
}

ExternalFileUnit &ExternalFileUnit::CreateNew(
    int, const Terminator &terminator) {
  terminator.Crash("%s: unsupported", RT_PRETTY_FUNCTION);
}

ExternalFileUnit *ExternalFileUnit::LookUpForClose(
    int, Terminator &terminator) {
  terminator.Crash("%s: unsupported", RT_PRETTY_FUNCTION);
}

ExternalFileUnit &ExternalFileUnit::NewUnit(
    const Terminator &terminator, bool) {
  terminator.Crash("%s: unsupported", RT_PRETTY_FUNCTION);
}

bool ExternalFileUnit::OpenUnit(common::optional<OpenStatus> status,
    common::optional<Action>, Position, OwningPtr<char> &&, std::size_t,
    Convert, IoErrorHandler &handler) {
  handler.Crash("%s: unsupported", RT_PRETTY_FUNCTION);
}

bool ExternalFileUnit::OpenAnonymousUnit(common::optional<OpenStatus>,
    common::optional<Action>, Position, Convert convert,
    IoErrorHandler &handler) {
  handler.Crash("%s: unsupported", RT_PRETTY_FUNCTION);
}

void ExternalFileUnit::CloseUnit(CloseStatus, IoErrorHandler &handler) {
  handler.Crash("%s: unsupported", RT_PRETTY_FUNCTION);
}

void ExternalFileUnit::DestroyClosed(Terminator &terminator) {
  terminator.Crash("%s: unsupported", RT_PRETTY_FUNCTION);
}

Iostat ExternalFileUnit::SetDirection(Direction direction) {
  if (direction != Direction::Output) {
    return IostatReadFromWriteOnly;
  }
  direction_ = direction;
  return IostatOk;
}

void ExternalFileUnit::CloseAll(IoErrorHandler &) {}

void ExternalFileUnit::FlushAll(IoErrorHandler &) {}

int ExternalFileUnit::GetAsynchronousId(IoErrorHandler &handler) {
  handler.Crash("%s: unsupported", RT_PRETTY_FUNCTION);
}

bool ExternalFileUnit::Wait(int) {
  Terminator{__FILE__, __LINE__}.Crash("unsupported");
}

void PseudoOpenFile::set_mayAsynchronous(bool yes) {
  if (yes) {
    Terminator{__FILE__, __LINE__}.Crash("%s: unsupported", RT_PRETTY_FUNCTION);
  }
}

common::optional<PseudoOpenFile::FileOffset> PseudoOpenFile::knownSize() const {
  Terminator{__FILE__, __LINE__}.Crash("unsupported");
}

void PseudoOpenFile::Open(
    OpenStatus, common::optional<Action>, Position, IoErrorHandler &handler) {
  handler.Crash("%s: unsupported", RT_PRETTY_FUNCTION);
}

void PseudoOpenFile::Close(CloseStatus, IoErrorHandler &handler) {
  handler.Crash("%s: unsupported", RT_PRETTY_FUNCTION);
}

std::size_t PseudoOpenFile::Read(
    FileOffset, char *, std::size_t, std::size_t, IoErrorHandler &handler) {
  handler.Crash("%s: unsupported", RT_PRETTY_FUNCTION);
}

std::size_t PseudoOpenFile::Write(FileOffset at, const char *buffer,
    std::size_t bytes, IoErrorHandler &handler) {
  char *mutableBuffer{const_cast<char *>(buffer)};
  char save{buffer[bytes]};
  mutableBuffer[bytes] = '\0';
  std::printf("%s", buffer);
  mutableBuffer[bytes] = save;
  return bytes;
}

void PseudoOpenFile::Truncate(FileOffset, IoErrorHandler &handler) {
  handler.Crash("%s: unsupported", RT_PRETTY_FUNCTION);
}

int PseudoOpenFile::ReadAsynchronously(
    FileOffset, char *, std::size_t, IoErrorHandler &handler) {
  handler.Crash("%s: unsupported", RT_PRETTY_FUNCTION);
}

int PseudoOpenFile::WriteAsynchronously(
    FileOffset, const char *, std::size_t, IoErrorHandler &handler) {
  handler.Crash("%s: unsupported", RT_PRETTY_FUNCTION);
}

void PseudoOpenFile::Wait(int, IoErrorHandler &handler) {
  handler.Crash("%s: unsupported", RT_PRETTY_FUNCTION);
}

void PseudoOpenFile::WaitAll(IoErrorHandler &handler) {
  handler.Crash("%s: unsupported", RT_PRETTY_FUNCTION);
}

Position PseudoOpenFile::InquirePosition(FileOffset) const {
  Terminator{__FILE__, __LINE__}.Crash("%s: unsupported", RT_PRETTY_FUNCTION);
}

} // namespace Fortran::runtime::io

#endif // defined(RT_USE_PSEUDO_FILE_UNIT)