#ifndef RR_GENERIC_ALLOCATOR_H
#define RR_GENERIC_ALLOCATOR_H

#include <librr/types.h>

typedef struct rr_generic_allocator rr_generic_allocator_s;
typedef struct rr_generic_pool      rr_generic_pool_s;
typedef struct rr_generic_arena     rr_generic_arena_s;

typedef rr_generic_arena_s (*rr_create_arena_fn) (usz_t capacity);
typedef rr_generic_pool_s  (*rr_create_pool_fn)  (usz_t item_size, usz_t num_items);

struct rr_generic_allocator
{
    void *            (*fn_alloc)               (rr_generic_allocator_s *allocator, usz_t num_bytes);
    void              (*fn_free)                (rr_generic_allocator_s *allocator, void *block);
    void              (*fn_destruct)            (rr_generic_allocator_s *allocator);
    void               *specifics;
};

struct rr_generic_pool
{
    void *            (*fn_alloc)               (rr_generic_pool_s *pool);
    void              (*fn_free)                (rr_generic_pool_s *pool, void *block);
    void              (*fn_destruct)            (rr_generic_pool_s *pool);
    void               *specifics;
};

struct rr_generic_arena
{
    void *            (*fn_alloc)               (rr_generic_arena_s *arena, usz_t num_bytes);
    void              (*fn_destruct)            (rr_generic_arena_s *arena);
    void               *specifics;
};

void * rr_alloc(rr_generic_allocator_s *allocator, usz_t size);
void rr_free(rr_generic_allocator_s *allocator, void *allocation);

void * rr_arena_alloc(rr_generic_arena_s *arena, usz_t size);

void * rr_pool_alloc(rr_generic_pool_s *pool);
void rr_pool_free(rr_generic_pool_s *pool, void *allocation);


#ifndef __RR_AVOID_STDLIB
rr_generic_allocator_s rr_provide_stdlib_allocator();
#endif // __RR_AVOID_STDLIB

rr_generic_arena_s rr_provide_arena(rr_generic_allocator_s *allocator, usz_t len_allocation);
rr_generic_pool_s rr_provide_dynamic_pool(rr_generic_allocator_s *allocator, usz_t item_size, usz_t capacity);
rr_generic_pool_s rr_provide_static_pool(rr_generic_allocator_s *allocator, usz_t item_size, usz_t capacity);

rr_generic_arena_s rr_provide_arena_from_malloc(usz_t len_allocation);
rr_generic_pool_s rr_provide_dynamic_pool_from_malloc(usz_t item_size, usz_t capacity);
rr_generic_pool_s rr_provide_static_pool_from_malloc(usz_t item_size, usz_t capacity);

#endif // RR_GENERIC_ALLOCATOR_H