#ifndef SN_TARGET
#define SN_TARGET

#include "sn_internal.h"
#include <stdint.h>

#define SN_OS_WINDOWS 0
#define SN_OS_LINUX 1
#define SN_OS_MACOS 2
#define SN_OS_IOS 3
#define SN_OS_ANDROID 4
#define SN_OS_UNKNOWN 5

#define SN_ARCH_X86_64 0
#define SN_ARCH_ARM64 1
#define SN_ARCH_RISCV64 2
#define SN_ARCH_PPC64le 3

/*
 * Target selection policy:
 * - Default (no SN_EXTERN_TARGET): fixed Windows + x86_64.
 * - External (SN_EXTERN_TARGET): build system must provide SN_OS and SN_ARCH.
 */
#ifndef SN_EXTERN_TARGET

#define SN_OS_TARGET SN_OS_WINDOWS
#define SN_ARCH_TARGET SN_ARCH_X86_64

#else

#ifndef SN_OS_TARGET
#error "SN_EXTERN_TARGET is defined but SN_OS is not provided."
#endif

#ifndef SN_ARCH_TARGET
#error "SN_EXTERN_TARGET is defined but SN_ARCH is not provided."
#endif

/* Validate externally supplied values are within known enum constants. */
#if (SN_OS_TARGET != SN_OS_WINDOWS) && (SN_OS_TARGET != SN_OS_LINUX) && \
        (SN_OS_TARGET != SN_OS_MACOS) && (SN_OS_TARGET != SN_OS_IOS) && \
        (SN_OS_TARGET != SN_OS_ANDROID) && (SN_OS_TARGET != SN_OS_UNKNOWN)
#error "SN_OS has an invalid value. Use SN_OS_<...> enum constants."
#endif

#if (SN_ARCH_TARGET != SN_ARCH_X86_64) && (SN_ARCH_TARGET != SN_ARCH_ARM64) && \
        (SN_ARCH_TARGET != SN_ARCH_RISCV64) && (SN_ARCH_TARGET != SN_ARCH_PPC64le)
#error "SN_ARCH has an invalid value. Use SN_ARCH_<...> enum constants."
#endif

#endif

#define SN_IS_OS(os) ((SN_OS_TARGET) == (os))

#define SN_IS_ARCH(arch) ((SN_ARCH_TARGET) == (arch))

typedef union SIMDID {
        uint64_t mask;
        char make_byte[8];
} SIMDID;

SN_API SIMDID SN_DECL sn_get_simd_level();

#endif // SN_TARGET