// This is core/vnl/io/vnl_io_vector_fixed.hxx
#ifndef vnl_io_vector_fixed_hxx_
#define vnl_io_vector_fixed_hxx_
//:
// \file

#include "vnl_io_vector_fixed.h"
#include <vsl/vsl_binary_io.h>
#include <vsl/vsl_b_read_block_old.h>
#include <vsl/vsl_block_binary.h>

//=================================================================================
//: Binary save self to stream.
template <class T, unsigned int n>
void
vsl_b_write(vsl_b_ostream & os, const vnl_vector_fixed<T, n> & p)
{
  constexpr short io_version_no = 2;
  vsl_b_write(os, io_version_no);
  vsl_b_write(os, p.size());
  if (!p.empty())
    vsl_block_binary_write(os, p.data_block(), p.size());
}

//=================================================================================
//: Binary load self from stream.
template <class T, unsigned int n>
void
vsl_b_read(vsl_b_istream & is, vnl_vector_fixed<T, n> & p)
{
  if (!is)
    return;

  short ver;
  unsigned stream_n;
  vsl_b_read(is, ver);
  switch (ver)
  {
    case 1:
#if !VXL_LEGACY_FUTURE_REMOVE
      vsl_b_read(is, stream_n);
      if (n == stream_n)
      {
        vsl_b_read_block_old(is, p.begin(), n);
      }
      else
      {
        std::cerr << "I/O ERROR: vsl_b_read(vsl_b_istream&, vnl_vector_fixed<T,n>&)\n"
                  << "           Expected n=" << n << ", got " << stream_n << '\n';
        is.is().clear(std::ios::badbit); // Set an unrecoverable IO error on stream
        return;
      }
      break;
#else
      std::cerr << "I/O ERROR: Old version 1 file formats are no longer supported since deprecation of required "
                   "function vsl_b_read_block_old in 2006\n";
#endif

    case 2:
      vsl_b_read(is, stream_n);
      if (n == stream_n)
      {
        vsl_block_binary_read(is, p.data_block(), n);
      }
      else
      {
        std::cerr << "I/O ERROR: vsl_b_read(vsl_b_istream&, vnl_vector_fixed<T,n>&)\n"
                  << "           Expected n=" << n << ", got " << stream_n << '\n';
        is.is().clear(std::ios::badbit); // Set an unrecoverable IO error on stream
        return;
      }
      break;

    default:
      std::cerr << "I/O ERROR: vsl_b_read(vsl_b_istream&, vnl_vector_fixed<T,n>&)\n"
                << "           Unknown version number " << ver << '\n';
      is.is().clear(std::ios::badbit); // Set an unrecoverable IO error on stream
      return;
  }
}

//====================================================================================
//: Output a human readable summary to the stream
template <class T, unsigned int n>
void
vsl_print_summary(std::ostream & os, const vnl_vector_fixed<T, n> & p)
{
  os << "Len: " << p.size() << " [fixed] (";
  for (unsigned int i = 0; i < p.size() && i < 5; ++i)
    os << p(i) << ' ';
  if (p.size() > 5)
    os << " ...";
  os << ')';
}

#define VNL_IO_VECTOR_FIXED_INSTANTIATE(T, n)                                      \
  template void vsl_print_summary(std::ostream &, const vnl_vector_fixed<T, n> &); \
  template void vsl_b_read(vsl_b_istream &, vnl_vector_fixed<T, n> &);             \
  template void vsl_b_write(vsl_b_ostream &, const vnl_vector_fixed<T, n> &)

#endif // vnl_io_vector_fixed_hxx_
