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#include "base/file_stream.h"

#ifdef OS_WIN
#include <codecvt>
#include <locale>
#endif  // OS_WIN

#include <string>

namespace mozc {
namespace {

#ifdef OS_WIN
std::wstring ToPlatformString(const char* filename) {
  // Since Windows uses UTF-16 for internationalized file names, we should
  // convert the encoding of the given |filename| from UTF-8 to UTF-16.
  // NOTE: To avoid circular dependency, |Util::UTF8ToWide| shouldn't be used
  // here.
  std::wstring_convert<std::codecvt_utf8_utf16<wchar_t>, wchar_t> utf8_to_wide;
  return utf8_to_wide.from_bytes(filename);
}
#else   // OS_WIN
std::string ToPlatformString(const char* filename) {
  return std::string(filename);
}
#endif  // OS_WIN or not

}  // namespace

InputFileStream::InputFileStream() {}

InputFileStream::InputFileStream(const char* filename,
                                 std::ios_base::openmode mode) {
  InputFileStream::open(filename, mode);
}

void InputFileStream::open(const char* filename, std::ios_base::openmode mode) {
  std::ifstream::open(ToPlatformString(filename), mode);
}

OutputFileStream::OutputFileStream() {}

OutputFileStream::OutputFileStream(const char* filename,
                                   std::ios_base::openmode mode) {
  OutputFileStream::open(filename, mode);
}

void OutputFileStream::open(const char* filename,
                            std::ios_base::openmode mode) {
  std::ofstream::open(ToPlatformString(filename), mode);
}

// Common implementations.

void InputFileStream::ReadToString(std::string* s) {
  seekg(0, end);
  const size_t size = tellg();
  seekg(0, beg);
  s->resize(size);
  read(&(*s)[0], size);
}

std::string InputFileStream::Read() {
  std::string s;
  ReadToString(&s);
  return s;
}

void InputFileStream::UnusedKeyMethod() {}   // go/definekeymethod
void OutputFileStream::UnusedKeyMethod() {}  // go/definekeymethod

}  // namespace mozc
