#ifndef SN_TARGET
#define SN_TARGET

typedef enum SN_OS_T {
        SN_OS_WINDOWS,
        SN_OS_LINUX,
        SN_OS_MACOS,
        SN_OS_IOS,
        SN_OS_ANDROID,
        SN_OS_UNKNOWN
} SN_OS_T;

typedef enum SN_ARCH_T {
        SN_ARCH_X86_64,
        SN_ARCH_ARM64,
        SN_ARCH_RISCV64,
        SN_ARCH_PPC64le,
} SN_ARCH_T;

/*
 * 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

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

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

#endif // SN_TARGET