#pragma once
#include <stdint.h>
#include <stddef.h>

typedef uint8_t   u8;
typedef uint16_t  u16;
typedef int16_t   i16;
typedef int32_t   i32;
typedef uint32_t  u32;
typedef uint64_t  u64;
typedef float     f32;
typedef double    f64;
typedef uintptr_t uptr;
typedef char      sbyte;
typedef ptrdiff_t size;
typedef size_t    usize;

enum OptionTag {NONE, SOME};

#define OPTION(type)                                                    \
    typedef struct                                                      \
    {                                                                   \
        enum OptionTag tag;                                             \
        union {                                                         \
            char none;                                                  \
            type value;                                                 \
        };                                                              \
    } type##_opt;                                                       \
                                                                        \
    static inline type##_opt none_##type(void)                          \
    {                                                                   \
        return (type##_opt){ .tag = NONE, .none = 0 };                  \
    }                                                                   \
                                                                        \
    static inline type##_opt some_##type(type value)                    \
    {                                                                   \
        return (type##_opt){ .tag = SOME, .value = value };             \
    }                                                                   \
                                                                        \
    static inline int get_some_##type(type##_opt opt, type* out_value)  \
    {                                                                   \
        if (opt.tag != SOME) return 0;                                  \
        *out_value = opt.value;                                         \
        return 1;                                                       \
    }

#define IF_LET_SOME(type, var, opt)             \
    type var;                                   \
    if (get_some_##type(opt, &var))


OPTION(u8)
OPTION(u16)