/***
    Copyright (©) 2020 Reece Wilson (a/k/a "Reece").
    All rights reserved.

    File: AuroraEnvironment.h
    Date: 2020-6-9
    Originator: Reece
    Purpose:
***/
#pragma once

#if defined(__clang_major__)
    #define AURORA_COMPILER_CLANG
#elif defined(_MSC_VER)
    #define AURORA_COMPILER_MSVC
#elif __GNUC__ > 8 || __GNUC__ == 8 // minimum *might* be boosted to 10 soon
    #define AURORA_COMPILER_GCC
#elif __GNUC__
    #error GCC outdated
#else
    #error Illegal Compiler
#endif

#if defined(_LINUX_KERNEL_AURORA_PREPROCESSOR)
    #define AURORA_PLATFORM_KERNEL_LINUX
#elif defined(_NTOS_AURORA_PREPROCESSOR)
    #define AURORA_PLATFORM_NTOS
#elif defined(_WINDOWS) || defined(_WIN32) || defined(_WIN64) 
    #define AURORA_PLATFORM_WIN32
#elif defined(__ANDROID__) || defined(_ANDROID_AURORA_PREPROCESSOR)
    #define AURORA_PLATFORM_ANDROID
#elif defined(__linux__) || defined(_LINUX_AURORA_PREPROCESSOR)
    #define AURORA_PLATFORM_LINUX
#elif (defined(__APPLE__) && defined(__MACH__)) || defined(_APPLE_AURORA_PREPROCESSOR)
    #define AURORA_PLATFORM_APPLE
#elif (defined(__APPLE__) && defined(TARGET_OS_IPHONE)) || defined(_APPLE_MOBILE_AURORA_PREPROCESSOR)
    #define AURORA_PLATFORM_IOS
#elif defined(__FreeBSD__)
    #define AURORA_PLATFORM_BSD
#elif defined(_SWITCH_AURORA_PREPROCESSOR)
    #define AURORA_PLATFORM_SWITCH
#elif defined(_PS4_AURORA_PREPROCESSOR) || defined(__ORBIS__)
    #define AURORA_PLATFORM_PS4
#elif defined(_PS5_AURORA_PREPROCESSOR)
    #define AURORA_PLATFORM_PS5
#elif defined(_XBONE_AURORA_PREPROCESSOR) || defined(_XBOX_ONE)
    #define AURORA_PLATFORM_XBONE
#elif defined(_WII_AURORA_PREPROCESSOR)
    #define AURORA_PLATFORM_WII
#elif defined(_WII_U_AURORA_PREPROCESSOR)
    #define AURORA_PLATFORM_WII_U
#endif

#if defined(_GAMING_XBOX)
    #define VENDOR_CONSOLE_MICROSOFT
#elif defined(__APPLE__)
    #define VENDOR_GENERIC_APPLE
#elif defined(AURORA_PLATFORM_PS4) || defined(AURORA_PLATFORM_PS5)
    #define VENDOR_CONSOLE_SONY
#elif defined(AURORA_PLATFORM_SWITCH) || defined(AURORA_PLATFORM_WII)|| defined(AURORA_PLATFORM_WII_U)
    #define VENDOR_CONSOLE_NINTENDO
#elif defined(AURORA_PLATFORM_NTOS) || defined(AURORA_PLATFORM_WIN32)
    #define VENDOR_GENERIC_MICROSOFT
#else 
    #define VENDOR_UNKNOWN
#endif

#if defined(AURORA_PLATFORM_BSD) || defined(AURORA_PLATFORM_IOS) || defined(AURORA_PLATFORM_APPLE) || defined(VENDOR_CONSOLE_SONY) 
    #define AURORA_IS_BSD_DERIVED
#endif

#if defined(AURORA_PLATFORM_LINUX) || defined(AURORA_PLATFORM_ANDROID) 
    #define AURORA_IS_LINUX_DERIVED
#endif

#if defined(VENDOR_GENERIC_APPLE)
    #define AURORA_IS_XNU_DERIVED
#endif

#if defined(AURORA_IS_BSD_DERIVED) || defined(AURORA_IS_LINUX_DERIVED) || defined(VENDOR_GENERIC_APPLE) 
    #define AURORA_IS_POSIX_DERIVED
#endif

#if defined(VENDOR_CONSOLE_MICROSOFT) || defined(AURORA_PLATFORM_WIN32) 
    #define AURORA_IS_MODERNNT_DERIVED
#endif

#if defined(AURORA_COMPILER_MSVC)

    #if defined(_M_X64)
        #define AURORA_ABI_MSFT_64
        #define AURORA_ARCH_X64
        #define AURORA_IS_64BIT
    #elif defined(__aarch64__)
        #define AURORA_ARCH_ARM
        #define AURORA_ABI_MS_ARM
        #define AURORA_IS_64BIT
    #else
        #define AURORA_ARCH_X86
        #define AURORA_ABI_CDECL
        #define AURORA_IS_32BIT
    #endif

    #define AURORA_SYMBOL_IMPORT __declspec(dllimport) 
    #define AURORA_SYMBOL_EXPORT __declspec(dllexport) 

#elif defined(AURORA_COMPILER_GCC) || defined(AURORA_COMPILER_CLANG)

    #if defined(__x86_64__)
        #define AURORA_ARCH_X64
        #if defined(AURORA_PLATFORM_WIN32) || defined(AURORA_PLATFORM_NTOS)
            #define AURORA_ABI_MSFT_64
        #else
            #define AURORA_ABI_SYSV
        #endif
        #define AURORA_IS_64BIT
    #elif defined(__aarch64__)
        #define AURORA_ARCH_ARM
        #if defined(__APPLE__)
            #define AURORA_ABI_APPLE_ARM
        #else
            #define AURORA_ABI_LLVM_ARM 
        #endif
        #define AURORA_IS_64BIT
    #else
        #define AURORA_ARCH_X86
        #define AURORA_ABI_CDECL
        #define AURORA_IS_32BIT
    #endif

    #if defined(AURORA_IS_MODERNNT_DERIVED)
        #define AURORA_SYMBOL_IMPORT 
        #define AURORA_SYMBOL_EXPORT __declspec(dllexport) 
    #else
        #define AURORA_SYMBOL_IMPORT 
        #define AURORA_SYMBOL_EXPORT __attribute__((visibility("default")))
    #endif

#endif

#if defined(__cplusplus)
    #if defined(_AURORA_DONT_QUESTION_ME_17)
        #define AU_LANG_CPP_17
        #define AU_LANG_CPP
    #elif defined(_AURORA_DONT_QUESTION_ME_14)
        #define AU_LANG_CPP_14
        #define AU_LANG_CPP
    #elif __cplusplus > 201703L
        #define AU_LANG_CPP_20
        #define AU_LANG_CPP
    #elif __cplusplus >= 201703L
        #define AU_LANG_CPP_17
        #define AU_LANG_CPP
    #elif __cplusplus >= 201400L
        #define AU_LANG_CPP_14
        #define AU_LANG_CPP
    #else
        #define AU_LANG_C
    #endif
#endif

#if (defined(_CPU_BIG_AURORA_PREPROCESSOR) || defined(_CPU_LITTLE_AURORA_PREPROCESSOR))
    #if defined(_CPU_LITTLE_AURORA_PREPROCESSOR)
        #define AU_CPU_ENDIAN_LITTLE
    #elif defined(_CPU_BIG_AURORA_PREPROCESSOR)
        #define AU_CPU_ENDIAN_BIG
    #endif
#else

    // Could we please ignore this?
    #if defined(__has_include)
        #if __has_include(<endian.h>)
            #include <endian.h>
        #elif __has_include(<machine/endian.h>)
            #include <machine/endian.h>
        #endif
    #endif

    #if (defined(__BYTE_ORDER) && __BYTE_ORDER == __BIG_ENDIAN) || \
        (defined(__BYTE_ORDER) && __BYTE_ORDER == __ORDER_BIG_ENDIAN__) || \
        defined(__BIG_ENDIAN__) || \
        defined(__ARMEB__) || \
        defined(__THUMBEB__) || \
        defined(__AARCH64EB__) || \
        defined(_M_PPC) || \
        (defined(__sun) && defined(__SVR4) && defined(_BIG_ENDIAN)) || \
        defined(_MIBSEB) || defined(__MIBSEB) || defined(__MIBSEB__) 

        #define AU_CPU_ENDIAN_BIG

    #elif (defined(__BYTE_ORDER) && __BYTE_ORDER == __LITTLE_ENDIAN) || \
          (defined(__BYTE_ORDER) && __BYTE_ORDER == __ORDER_LITTLE_ENDIAN__) || \
          defined(__LITTLE_ENDIAN__) || \
          defined(__ARMEL__) || \
          defined(__THUMBEL__) || \
          defined(__AARCH64EL__) || \
          defined(_MIPSEL) || defined(__MIPSEL) || defined(__MIPSEL__) || \
          defined(_M_IX86) || defined(_M_X64) 

        #define AU_CPU_ENDIAN_LITTLE

    #else
    
        #if defined(AURORA_PLATFORM_WIN32)
            #define AU_CPU_ENDIAN_LITTLE
        #else
            #define AU_CPU_ENDIAN_LITTLE
        #endif

    #endif
#endif