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// test_utf8_codecvt.cpp

// (C) Copyright 2002-4 Robert Ramey - http://www.rrsd.com . 
// Use, modification and distribution is subject to 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 <algorithm>
#include <fstream>
#include <iostream>
#include <iterator>
#include <locale>
#include <vector>
#include <string>

#include <cstddef> // size_t
#include <boost/config.hpp>
#if defined(BOOST_NO_STDC_NAMESPACE)
namespace std{ 
    using ::size_t; 
} // namespace std
#endif

#include <cwchar>
#ifdef BOOST_NO_STDC_NAMESPACE
namespace std{ using ::wcslen; }
#endif

#include "../test/test_tools.hpp"
#include <boost/archive/iterators/istream_iterator.hpp>
#include <boost/archive/iterators/ostream_iterator.hpp>

#include <boost/archive/add_facet.hpp>
#include <boost/archive/detail/utf8_codecvt_facet.hpp>

template<std::size_t s>
struct test_data
{
    static unsigned char utf8_encoding[];
    static wchar_t wchar_encoding[];
};

template<>
unsigned char test_data<2>::utf8_encoding[] = {
    0x01,
    0x7f,
    0xc2, 0x80,
    0xdf, 0xbf,
    0xe0, 0xa0, 0x80,
    0xe7, 0xbf, 0xbf
};

template<>
wchar_t test_data<2>::wchar_encoding[] = {
    0x0001,
    0x007f,
    0x0080,
    0x07ff,
    0x0800,
    0x7fff
};

template<>
unsigned char test_data<4>::utf8_encoding[] = {
    0x01,
    0x7f,
    0xc2, 0x80,
    0xdf, 0xbf,
    0xe0, 0xa0, 0x80,
    0xef, 0xbf, 0xbf,
    0xf0, 0x90, 0x80, 0x80,
    0xf4, 0x8f, 0xbf, 0xbf,
    0xf7, 0xbf, 0xbf, 0xbf,
    0xf8, 0x88, 0x80, 0x80, 0x80,
    0xfb, 0xbf, 0xbf, 0xbf, 0xbf,
    0xfc, 0x84, 0x80, 0x80, 0x80, 0x80,
    0xfd, 0xbf, 0xbf, 0xbf, 0xbf, 0xbf
};

template<>
wchar_t test_data<4>::wchar_encoding[] = {
    0x00000001,
    0x0000007f,
    0x00000080,
    0x000007ff,
    0x00000800,
    0x0000ffff,
    0x00010000,
    0x0010ffff,
    0x001fffff,
    0x00200000,
    0x03ffffff,
    0x04000000,
    0x7fffffff
};

int
test_main(int /* argc */, char * /* argv */[]) {
    std::locale old_loc;
    std::locale * utf8_locale
        = boost::archive::add_facet(
            old_loc, 
            new boost::archive::detail::utf8_codecvt_facet
        );

    typedef char utf8_t;
    typedef test_data<sizeof(wchar_t)> td;

    // Send our test UTF-8 data to file
    {
        std::ofstream ofs;
        ofs.open("test.dat", std::ios::binary);
        std::copy(
            td::utf8_encoding,
            #if ! defined(__BORLANDC__)
                // borland 5.60 complains about this
                td::utf8_encoding + sizeof(td::utf8_encoding) / sizeof(unsigned char),
            #else
                // so use this instead
                td::utf8_encoding + 12,
            #endif
            boost::archive::iterators::ostream_iterator<utf8_t>(ofs)
        );
    }

    // Read the test data back in, converting to UCS-4 on the way in
    std::vector<wchar_t> from_file;
    {
        std::wifstream ifs;
        ifs.imbue(*utf8_locale);
        ifs.open("test.dat");

        wchar_t item = 0;
        // note can't use normal vector from iterator constructor because
        // dinkumware doesn't have it.
        for(;;){
            item = ifs.get();
            if(item == WEOF)
                break;
            //ifs >> item;
            //if(ifs.eof())
            //    break;
            from_file.push_back(item);
        }
    }

    // compare the data read back in with the orginal
    #if ! defined(__BORLANDC__)
        // borland 5.60 complains about this
        BOOST_CHECK(from_file.size() == sizeof(td::wchar_encoding)/sizeof(wchar_t));
    #else
        // so use this instead
        BOOST_CHECK(from_file.size() == 6);
    #endif

    BOOST_CHECK(std::equal(from_file.begin(), from_file.end(), td::wchar_encoding));
  
    // Send the UCS4_data back out, converting to UTF-8
    {
        std::wofstream ofs;
        ofs.imbue(*utf8_locale);
        ofs.open("test2.dat");
        std::copy(
            from_file.begin(),
            from_file.end(),
            boost::archive::iterators::ostream_iterator<wchar_t>(ofs)
        );
    }

    // Make sure that both files are the same
    {
        typedef boost::archive::iterators::istream_iterator<utf8_t> is_iter;
        is_iter end_iter;

        std::ifstream ifs1("test.dat");
        is_iter it1(ifs1);
        std::vector<utf8_t> data1;
        std::copy(it1, end_iter, std::back_inserter(data1));

        std::ifstream ifs2("test2.dat");
        is_iter it2(ifs2);
        std::vector<utf8_t> data2;
        std::copy(it2, end_iter, std::back_inserter(data2));

        BOOST_CHECK(data1 == data2);
    }

    // some libraries have trouble that only shows up with longer strings
    
    wchar_t * test3_data = L"\
    <?xml version=\"1.0\" encoding=\"UTF-8\" standalone=\"yes\" ?>\
    <!DOCTYPE boost_serialization>\
    <boost_serialization signature=\"serialization::archive\" version=\"3\">\
    <a class_id=\"0\" tracking_level=\"0\">\
        <b>1</b>\
        <f>96953204</f>\
        <g>177129195</g>\
        <l>1</l>\
        <m>5627</m>\
        <n>23010</n>\
        <o>7419</o>\
        <p>16212</p>\
        <q>4086</q>\
        <r>2749</r>\
        <c>-33</c>\
        <s>124</s>\
        <t>28</t>\
        <u>32225</u>\
        <v>17543</v>\
        <w>0.84431422</w>\
        <x>1.0170664757130923</x>\
        <y>tjbx</y>\
        <z>cuwjentqpkejp</z>\
    </a>\
    </boost_serialization>\
    ";
    
    // Send the UCS4_data back out, converting to UTF-8
    std::size_t l = std::wcslen(test3_data);
    {
        std::wofstream ofs;
        ofs.imbue(*utf8_locale);
        ofs.open("test3.dat");
        std::copy(
            test3_data,
            test3_data + l,
            boost::archive::iterators::ostream_iterator<wchar_t>(ofs)
        );
    }

    // Make sure that both files are the same
    {
        std::wifstream ifs;
        ifs.imbue(*utf8_locale);
        ifs.open("test3.dat");
        BOOST_CHECK(
            std::equal(
                test3_data,
                test3_data + l,
                boost::archive::iterators::istream_iterator<wchar_t>(ifs)
            )
        );
    }

    delete utf8_locale;
    return EXIT_SUCCESS;
}