//===-- FileTest.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
//
//===----------------------------------------------------------------------===//

#include "lldb/Host/File.h"
#include "llvm/ADT/SmallString.h"
#include "llvm/ADT/StringRef.h"
#include "llvm/Support/FileSystem.h"
#include "llvm/Support/FileUtilities.h"
#include "llvm/Support/Path.h"
#include "llvm/Support/Program.h"
#include "gtest/gtest.h"

#ifdef _WIN32
#include "lldb/Host/windows/windows.h"
#endif

using namespace lldb;
using namespace lldb_private;

TEST(File, GetWaitableHandleFileno) {
  const auto *Info = testing::UnitTest::GetInstance()->current_test_info();

  llvm::SmallString<128> name;
  int fd;
  llvm::sys::fs::createTemporaryFile(llvm::Twine(Info->test_case_name()) + "-" +
                                         Info->name(),
                                     "test", fd, name);
  llvm::FileRemover remover(name);
  ASSERT_GE(fd, 0);

  FILE *stream = fdopen(fd, "r");
  ASSERT_TRUE(stream);

  NativeFile file(stream, File::eOpenOptionReadWrite, true);
#ifdef _WIN32
  EXPECT_EQ(file.GetWaitableHandle(), (HANDLE)_get_osfhandle(fd));
#else
  EXPECT_EQ(file.GetWaitableHandle(), (file_t)fd);
#endif
}

TEST(File, GetStreamFromDescriptor) {
  const auto *Info = testing::UnitTest::GetInstance()->current_test_info();
  llvm::SmallString<128> name;
  int fd;
  llvm::sys::fs::createTemporaryFile(llvm::Twine(Info->test_case_name()) + "-" +
                                         Info->name(),
                                     "test", fd, name);

  llvm::FileRemover remover(name);
  ASSERT_GE(fd, 0);

  NativeFile file(fd, File::eOpenOptionWriteOnly, true);
  ASSERT_TRUE(file.IsValid());

  FILE *stream = file.GetStream();
  ASSERT_TRUE(stream != NULL);

  EXPECT_EQ(file.GetDescriptor(), fd);
#ifdef _WIN32
  EXPECT_EQ(file.GetWaitableHandle(), (HANDLE)_get_osfhandle(fd));
#else
  EXPECT_EQ(file.GetWaitableHandle(), (file_t)fd);
#endif
}

TEST(File, SeekFromEndStream) {
  const auto *Info = testing::UnitTest::GetInstance()->current_test_info();
  llvm::SmallString<128> name;
  int fd;
  llvm::sys::fs::createTemporaryFile(llvm::Twine(Info->test_case_name()) + "-" +
                                         Info->name(),
                                     "test", fd, name);
  llvm::FileRemover remover(name);
  ASSERT_GE(fd, 0);

  FILE *stream = fdopen(fd, "w+");
  ASSERT_TRUE(stream);

  // Write some data so the file has a known size.
  const char data[] = "0123456789";
  ASSERT_EQ(fwrite(data, 1, sizeof(data) - 1, stream), sizeof(data) - 1);
  ASSERT_EQ(fflush(stream), 0);

  // Use the stream-based NativeFile to exercise the stream path in
  // SeekFromEnd. Before the fix, the stream path was missing a return
  // statement, causing the error to be incorrectly set to "invalid file
  // handle".
  NativeFile file(stream, File::eOpenOptionReadWrite, true);

  Status error;
  off_t result = file.SeekFromEnd(-5, &error);
  EXPECT_TRUE(error.Success());
  EXPECT_EQ(result, 0); // fseek returns 0 on success
}

TEST(File, ReadOnlyModeNotWritable) {
  const auto *Info = testing::UnitTest::GetInstance()->current_test_info();
  llvm::SmallString<128> name;
  int fd;
  llvm::sys::fs::createTemporaryFile(llvm::Twine(Info->test_case_name()) + "-" +
                                         Info->name(),
                                     "test", fd, name);

  llvm::FileRemover remover(name);
  ASSERT_GE(fd, 0);

  NativeFile file(fd, File::eOpenOptionReadOnly, true);
  ASSERT_TRUE(file.IsValid());
  llvm::StringLiteral buf = "Hello World";
  size_t bytes_written = buf.size();
  Status error = file.Write(buf.data(), bytes_written);
  EXPECT_EQ(error.Fail(), true);
}