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#ifndef BOOST_LEAF_COMMON_HPP_INCLUDED
#define BOOST_LEAF_COMMON_HPP_INCLUDED

// Copyright (c) 2018-2020 Emil Dotchevski and Reverge Studios, Inc.

// 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)

#ifndef BOOST_LEAF_ENABLE_WARNINGS
#   if defined(__clang__)
#       pragma clang system_header
#   elif (__GNUC__*100+__GNUC_MINOR__>301)
#       pragma GCC system_header
#   elif defined(_MSC_VER)
#       pragma warning(push,1)
#   endif
#endif

#include <boost/leaf/detail/print.hpp>
#include <string>
#include <cerrno>
#ifdef _WIN32
#   include <Windows.h>
#   include <cstring>
#ifdef min
#   undef min
#endif
#ifdef max
#   undef max
#endif
#endif

namespace boost { namespace leaf {

    struct e_api_function { char const * value; };

    struct e_file_name { std::string value; };

    struct e_errno
    {
        int value;

        template <class CharT, class Traits>
        friend std::basic_ostream<CharT, Traits> & operator<<( std::basic_ostream<CharT, Traits> & os, e_errno const & err )
        {
            return os << type<e_errno>() << ": " << err.value << ", \"" << std::strerror(err.value) << '"';
        }
    };

    struct e_type_info_name { char const * value; };

    struct e_at_line { int value; };

    namespace windows
    {
        struct e_LastError
        {
            unsigned value;

#ifdef _WIN32
            template <class CharT, class Traits>
            friend std::basic_ostream<CharT, Traits> & operator<<( std::basic_ostream<CharT, Traits> os, e_LastError const & err )
            {
                struct msg_buf
                {
                    LPVOID * p;
                    msg_buf(): p(0) { }
                    ~msg_buf() noexcept { if(p) LocalFree(p); }
                };
                msg_buf mb;
                if( FormatMessageA(
                    FORMAT_MESSAGE_ALLOCATE_BUFFER|FORMAT_MESSAGE_FROM_SYSTEM|FORMAT_MESSAGE_IGNORE_INSERTS,
                    0,
                    err.value,
                    MAKELANGID(LANG_NEUTRAL,SUBLANG_DEFAULT),
                    (LPSTR)&mb.p,
                    0,
                    0) )
                {
                    BOOST_LEAF_ASSERT(mb.p != 0);
                    char * z = std::strchr((LPSTR)mb.p,0);
                    if( z[-1] == '\n' )
                        *--z = 0;
                    if( z[-1] == '\r' )
                        *--z = 0;
                    return os << type<e_LastError>() << ": " << err.value << ", \"" << (LPCSTR)mb.p << '"';
                }
                return os;
            }
#else
            // TODO : Other platforms
#endif
        };
    }

} }

#endif

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