// --------------------------------------------------------
//        (C) Copyright Jeremy Siek   2001.
//        (C) Copyright Gennaro Prota 2003 - 2004.
//
// Distributed under the Boost Software License, Version 1.0.
//    (See accompanying file LICENSE_1_0.txt or copy at
//          http://www.boost.org/LICENSE_1_0.txt)
//
// -----------------------------------------------------------

#include <fstream>
#include <string>
#include <cstddef> // for std::size_t
#include <stdexcept> // for std::logic_error
#include <cassert>

#include "boost/config.hpp"
#if !defined (BOOST_NO_STRINGSTREAM)
# include <sstream>
#endif

#include "bitset_test.hpp"
#include "boost/dynamic_bitset.hpp"
#include "boost/detail/workaround.hpp"


// Codewarrior 8.3 for Win fails without this.
// Thanks Howard Hinnant ;)
#if BOOST_WORKAROUND(__MWERKS__, <= 0x3003) // 8.x
#pragma parse_func_templ off
#endif


#if defined BOOST_NO_STD_WSTRING || defined BOOST_NO_STD_LOCALE
# define BOOST_DYNAMIC_BITSET_NO_WCHAR_T_TESTS
#endif

#if !defined BOOST_DYNAMIC_BITSET_NO_WCHAR_T_TESTS
std::wstring widen_string( const std::string & str,
                           const std::locale & loc = std::locale() )
{
  std::wstring result;
  const std::string::size_type len = str.length();
  if(len != 0) {
    result.resize(len);
    BOOST_USE_FACET(std::ctype<wchar_t>, loc)
                  .widen(&str[0], 1 + &str[len-1], &result[0]);
  }
  return result;
}
#endif

template <typename Block>
void run_test_cases( BOOST_EXPLICIT_TEMPLATE_TYPE(Block) )
{

  typedef boost::dynamic_bitset<Block> bitset_type;
  typedef bitset_test<bitset_type> Tests;

  //=====================================================================
  // Test stream operator<<
  {

    // The test "variables" are: the stream type and its state, the
    // exception mask, the width, the fill char and the padding side (left/right)

    std::ios::iostate masks[] = {
                                  std::ios::goodbit,
                                  std::ios::eofbit,
                                  std::ios::failbit,
                                  std::ios::eofbit | std::ios::failbit
                                };

    static std::string strings[] = {
                                  std::string(""),
                                  std::string("0"),
                                  std::string("1"),
                                  std::string("11100"),
                                  get_long_string()
                                };

    char fill_chars[] =         { '*', 'x', ' ' };

    std::size_t num_masks   = sizeof(masks) / sizeof(masks[0]);
    std::size_t num_strings = sizeof(strings) / sizeof(strings[0]);
    std::size_t num_chars   = sizeof(fill_chars) / sizeof(fill_chars[0]);

    std::fstream not_good_stream("dynamic_bitset_tests - this file shouldn't exist",
                                 std::ios::in);


    for (std::size_t mi = 0; mi < num_masks; ++mi) {
      for (std::size_t si = 0; si < num_strings; ++si) {

        std::streamsize slen = (std::streamsize)(strings[si].length());

        assert( (std::numeric_limits<std::streamsize>::max)()
                 >=(std::streamsize)(1+slen*2) );

        for (std::size_t ci = 0; ci < num_chars; ++ci) {

          // note how "negative widths" are tested too
          const std::streamsize widths[] = { -1 - slen/2, 0, slen/2, 1 + slen*2 };
          std::size_t num_widths = sizeof(widths) / sizeof(widths[0]);

          for (std::size_t wi = 0; wi < num_widths; ++wi) {
            std::streamsize w = widths[wi];
            {
              // test 0 - stream !good()
              if(not_good_stream.good())
                  throw std::logic_error("Error in operator << tests"
                                         " - please, double check");
              bitset_type b(strings[si]);
              not_good_stream.width(w);
              not_good_stream.fill(fill_chars[ci]);
              try { not_good_stream.exceptions(masks[mi]); } catch(...) {}

              Tests::stream_inserter(b, not_good_stream, "<unused_string>");
            }
            {
              // test 1a - file stream
              bitset_type b(strings[si]);
              std::ofstream file(test_file_name(), std::ios::trunc);
              file.width(w);
              file.fill(fill_chars[ci]);
              file.exceptions(masks[mi]);
              Tests::stream_inserter(b, file, test_file_name());

            }
            {
              //NOTE: there are NO string stream tests - gps
            }
#if !defined (BOOST_DYNAMIC_BITSET_NO_WCHAR_T_TESTS)
            {
              // test 1b - wide file stream
              bitset_type b(strings[si]);
              std::wofstream file(test_file_name());
              file.width(w);
              file.fill(fill_chars[ci]);
              file.exceptions(masks[mi]);
              Tests::stream_inserter(b, file, test_file_name());
            }
#endif
          }
        }
      }
    } // for (; mi..)

  }

  //=====================================================================
  // Test stream operator>>
  {

  // The test "variables" are: the stream type, the exception mask,
  // the actual contents (and/or state) of the stream, and width.
  //
  // With few exceptions, each test case consists of writing a different
  // assortment of digits and "whitespaces" to a text stream and then checking
  // that what was written gets read back unchanged. That's NOT guaranteed by
  // the standard, unless the assortment always ends with a '\n' and satisfies
  // other conditions (see C99, 7.19.2/2), however it works in practice and is
  // a good "real life" test. Some characters, such as '\v' and '\f', are not
  // used exactly because they are the ones which will most likely give problems
  // on some systems (for instance '\f' could actually be written as a sequence
  // of new-lines, and we could never be able to read it back) [gps]
  //
  // Note how the bitset object is not initially empty. That helps checking
  // that it isn't erroneously clear()ed by operator>>.


  std::ios::iostate masks[] = {
                                  std::ios::goodbit,
                                  std::ios::eofbit,
                                  std::ios::failbit,
                                  std::ios::eofbit | std::ios::failbit
                                   };

  const std::string spaces = "\t\n "; //"\t\n\v\f ";

  const std::string long_string = get_long_string();
  /*const*/ static std::string strings[] = {
                  // NOTE: "const" gives the usual problems with Borland
                  //       (in Tests::stream_extractor instantiation)


#if !(defined __BORLANDC__     \
      && BOOST_WORKAROUND(BOOST_RWSTD_VER, BOOST_TESTED_AT(0x20101)))
                                        // Borland 5.5.1 with RW library crashes
            // empty string
            std::string(""),
            // no bitset
            spaces,
#endif
            // no bitset
            std::string("x"),
            std::string("\t  xyz"),

            // bitset of size 1
            std::string("0"),
            std::string("1"),

            std::string("  0  "),
            std::string("  1  "),
            spaces + "1",
            "1" + spaces,
            spaces + "1" + spaces,
            std::string("  x1x  "),
            std::string("  1x  "),

            // long bitset
            long_string,
            "  " + long_string + " xyz",
            spaces + long_string,
            spaces + long_string + spaces
    };


  //-----------------------------------------------------

  std::stringstream not_good_stream;
  not_good_stream << "test";
  std::string sink;
  not_good_stream >> sink; // now the stream should be in eof state

  const std::size_t num_masks = sizeof(masks) / sizeof(masks[0]);
  const std::size_t num_strings = sizeof(strings) / sizeof(strings[0]);

  for (std::size_t mi = 0; mi < num_masks; ++mi) {
    for (std::size_t si = 0; si < num_strings; ++si) {

      const std::streamsize slen = (std::streamsize)(strings[si].length());
      assert((std::numeric_limits<std::streamsize>::max)() >= (std::streamsize)(1+slen*2));

      std::streamsize widths[] = { -1, 0, slen/2, slen, 1 + slen*2 };
      std::size_t num_widths = sizeof(widths) / sizeof(widths[0]);

      for(std::size_t wi = 0; wi < num_widths; ++wi) {
        const std::streamsize w = widths[wi];

        // test 0 - !good() stream
        {
          if(not_good_stream.good())
            throw std::logic_error("Error in operator >> tests"
                                   " - please, double check");
          bitset_type b(1, 15ul); // note: b is not empty
          not_good_stream.width(w);
          try { not_good_stream.exceptions(masks[mi]); } catch(...) {}
          std::string irrelevant;
          Tests::stream_extractor(b, not_good_stream, irrelevant);
        }
        // test 1a - (narrow) file stream
        {
          bitset_type b(1, 255ul);
          {
            std::ofstream f(test_file_name());
            f << strings[si];
          }

          std::ifstream f(test_file_name());
          f.width(w);
          f.exceptions(masks[mi]);
          Tests::stream_extractor(b, f, strings[si]);
        }
#if !defined(BOOST_NO_STRINGSTREAM)
        // test 2a - stringstream
        {
          bitset_type b(1, 255ul);
          std::istringstream stream(strings[si]);
          stream.width(w);
          stream.exceptions(masks[mi]);
          Tests::stream_extractor(b, stream, strings[si]);
        }
#endif

#if !defined(BOOST_DYNAMIC_BITSET_NO_WCHAR_T_TESTS)
        // test 1b - wchar_t file stream
        {
          std::wstring wstr = widen_string(strings[si]);
          bitset_type b(1, 255ul);
          {
            std::basic_ofstream<wchar_t> of(test_file_name());
            of << wstr;
          }

          std::basic_ifstream<wchar_t> f(test_file_name());
          f.width(w);
          f.exceptions(masks[mi]);
          Tests::stream_extractor(b, f, wstr);
        }
        // test 2b - wstringstream
        {
          bitset_type b(1, 255ul);
          std::wstring wstr = widen_string(strings[si]);

          std::wistringstream wstream(wstr);
          wstream.width(w);
          wstream.exceptions(masks[mi]);
          Tests::stream_extractor(b, wstream, wstr);
        }
#endif // BOOST_DYNAMIC_BITSET_NO_WCHAR_T_TESTS

      }
    }

  } // for ( mi = 0; ...)


  }
  //=====================================================================
  // << Any other tests go here >>
  //         .....

}


int
test_main(int, char*[])
{
  run_test_cases<unsigned char>();
  run_test_cases<unsigned short>();
  run_test_cases<unsigned int>();
  run_test_cases<unsigned long>();
# ifdef BOOST_HAS_LONG_LONG
  run_test_cases< ::boost::ulong_long_type>();
# endif

  return 0;
}
