// Copyright 2009 Andy Tompkins 2009
// Copyright 2024 Peter Dimov
// Distributed under the Boost Software License, Version 1.0.
// https://www.boost.org/LICENSE_1_0.txt

#include <boost/uuid/uuid.hpp>
#include <boost/uuid/uuid_io.hpp>
#include <boost/core/lightweight_test.hpp>
#include <string>
#include <algorithm>

using namespace boost::uuids;

template<class Ch> void test( uuid const& u, Ch const* expected )
{
    int const N = 56;

    for( int n = 0; n < 36; ++n )
    {
        Ch buffer[ N ];

        std::fill( buffer + 0, buffer + N, '@' );

        // insufficient buffer size; must fail
        BOOST_TEST_NOT( to_chars( u, buffer + 0, buffer + n ) );

        // make sure nothing is written beyond the end
        BOOST_TEST( std::basic_string<Ch>( buffer + n, buffer + N ) == std::basic_string<Ch>( N - n, '@' ) );
    }

    for( int n = 36; n < 48; ++n )
    {
        Ch buffer[ N ];

        std::fill( buffer + 0, buffer + N, '@' );

        // sufficient buffer size; must succeed
        BOOST_TEST( to_chars( u, buffer + 0, buffer + n ) );

        // check that the correct string is produced
        BOOST_TEST( std::basic_string<Ch>( buffer + 0, buffer + 36 ) == std::basic_string<Ch>( expected ) );

        // make sure nothing is written beyond the end
        BOOST_TEST( std::basic_string<Ch>( buffer + n, buffer + N ) == std::basic_string<Ch>( N - n, '@' ) );
    }
}

int main()
{
    uuid const u1 = {{ 0 }};
    uuid const u2 = {{ 0x00, 0x01, 0x02, 0x03, 0x04, 0x05, 0x06, 0x07, 0x08, 0x09, 0x0a, 0x0b, 0x0c, 0x0d, 0x0e, 0x0f }};
    uuid const u3 = {{ 0x12, 0x34, 0x56, 0x78, 0x90, 0xab, 0xcd, 0xef, 0x12, 0x34, 0x56, 0x78, 0x90, 0xab, 0xcd, 0xef }};

    test( u1, "00000000-0000-0000-0000-000000000000" );
    test( u2, "00010203-0405-0607-0809-0a0b0c0d0e0f" );
    test( u3, "12345678-90ab-cdef-1234-567890abcdef" );

    test( u1, L"00000000-0000-0000-0000-000000000000" );
    test( u2, L"00010203-0405-0607-0809-0a0b0c0d0e0f" );
    test( u3, L"12345678-90ab-cdef-1234-567890abcdef" );

    test( u1, u"00000000-0000-0000-0000-000000000000" );
    test( u2, u"00010203-0405-0607-0809-0a0b0c0d0e0f" );
    test( u3, u"12345678-90ab-cdef-1234-567890abcdef" );

    test( u1, U"00000000-0000-0000-0000-000000000000" );
    test( u2, U"00010203-0405-0607-0809-0a0b0c0d0e0f" );
    test( u3, U"12345678-90ab-cdef-1234-567890abcdef" );

    test( u1, u8"00000000-0000-0000-0000-000000000000" );
    test( u2, u8"00010203-0405-0607-0809-0a0b0c0d0e0f" );
    test( u3, u8"12345678-90ab-cdef-1234-567890abcdef" );

    return boost::report_errors();
}