#pragma once

#include <nall/intrinsics.hpp>

namespace Math {
  static const long double e  = 2.71828182845904523536;
  static const long double Pi = 3.14159265358979323846;
}

#if defined(PLATFORM_WINDOWS)
  //minimum version needed for _wstat64, AI_ADDRCONFIG, etc
  #undef  _WIN32_WINNT
  #define _WIN32_WINNT 0x0601
  #undef  __MSVCRT_VERSION__
  #define __MSVCRT_VERSION__ _WIN32_WINNT
  #include <nall/windows/utf8.hpp>
#endif

#include <atomic>
#include <limits>
#include <mutex>
#include <utility>

#include <assert.h>
#include <errno.h>
#include <limits.h>
#include <math.h>
#include <stdarg.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <time.h>
#include <fcntl.h>

#include <sys/types.h>
#include <sys/stat.h>

#if defined(PLATFORM_WINDOWS)
  #include <io.h>
  #include <direct.h>
  #include <shlobj.h>
  #include <wchar.h>
  #include <winsock2.h>
  #include <ws2tcpip.h>
#else
  #include <dlfcn.h>
  #include <unistd.h>
  #include <pwd.h>
  #include <grp.h>
  #include <sys/socket.h>
  #include <sys/wait.h>
  #include <netinet/in.h>
  #include <netdb.h>
  #include <poll.h>
#endif

#if defined(COMPILER_VISUALCPP)
  #define va_copy(dest, src) ((dest) = (src))
#endif

#if defined(PLATFORM_WINDOWS)
  //fight Microsoft's ardent efforts at vendor lock-in

  #undef  interface
  #define dllexport __declspec(dllexport)
  #define MSG_NOSIGNAL 0

  extern "C" {
    using pollfd = WSAPOLLFD;
  }

  inline auto access(const char* path, int amode) -> int { return _waccess(nall::utf16_t(path), amode); }
  inline auto getcwd(char* buf, size_t size) -> char* { wchar_t wpath[PATH_MAX] = L""; if(!_wgetcwd(wpath, size)) return nullptr; strcpy(buf, nall::utf8_t(wpath)); return buf; }
  inline auto mkdir(const char* path, int mode) -> int { return _wmkdir(nall::utf16_t(path)); }
  inline auto poll(struct pollfd fds[], unsigned long nfds, int timeout) -> int { return WSAPoll(fds, nfds, timeout); }
  inline auto putenv(const char* value) -> int { return _wputenv(nall::utf16_t(value)); }
  inline auto realpath(const char* file_name, char* resolved_name) -> char* { wchar_t wfile_name[PATH_MAX] = L""; if(!_wfullpath(wfile_name, nall::utf16_t(file_name), PATH_MAX)) return nullptr; strcpy(resolved_name, nall::utf8_t(wfile_name)); return resolved_name; }
  inline auto rename(const char* oldname, const char* newname) -> int { return _wrename(nall::utf16_t(oldname), nall::utf16_t(newname)); }
  inline auto usleep(unsigned milliseconds) -> void { Sleep(milliseconds / 1000); }

  namespace nall {
    //network functions take void*, not char*. this allows them to be used without casting

    inline auto recv(int socket, void* buffer, size_t length, int flags) -> ssize_t {
      return ::recv(socket, (char*)buffer, length, flags);
    }

    inline auto send(int socket, const void* buffer, size_t length, int flags) -> ssize_t {
      return ::send(socket, (const char*)buffer, length, flags);
    }

    inline auto setsockopt(int socket, int level, int option_name, const void* option_value, socklen_t option_len) -> int {
      return ::setsockopt(socket, level, option_name, (const char*)option_value, option_len);
    }
  }
#else
  #define dllexport
#endif

#if defined(PLATFORM_MACOSX)
  #define MSG_NOSIGNAL 0
#endif

#if defined(COMPILER_CLANG) || defined(COMPILER_GCC)
  #define neverinline   __attribute__((noinline))
  #define alwaysinline  inline __attribute__((always_inline))
  #if !defined(PLATFORM_MACOSX)
  //todo: we want this prefix; but it causes compilation errors
  #define deprecated    __attribute__((deprecated))
  #endif
#elif defined(COMPILER_VISUALCPP)
  #define neverinline   __declspec(noinline)
  #define alwaysinline  inline __forceinline
  #define deprecated    __declspec(deprecated)
#else
  #define neverinline
  #define alwaysinline  inline
  #define deprecated
#endif

#if defined(COMPILER_CLANG) || defined(COMPILER_GCC)
  #define unreachable __builtin_unreachable()
#else
  #define unreachable throw
#endif

#if defined(COMPILER_GCC) && __GNUC__ == 4 && __GNUC_MINOR__ <= 7
  //GCC 4.7.x has a bug (#54849) when specifying override with a trailing return type:
  //auto function() -> return_type override;  //this is the syntax that the C++11 standard requires
  //auto function() override -> return_type;  //this is the syntax that GCC 4.7.x requires
  //in order to compile code correctly with both compilers, we disable the override keyword for GCC
  #define override
#endif
