// vim:fileencoding=utf-8:foldmethod=marker

#ifndef MEM_ALLOCATOR_H
#define MEM_ALLOCATOR_H

#include "../../common/aliases/aliases.h"
#include "../../common/platform/platform.h"
#include <string.h>

#ifdef WAPP_PLATFORM_CPP
BEGIN_C_LINKAGE
#endif // !WAPP_PLATFORM_CPP

typedef void *(MemAllocFunc)(u64 size, void *alloc_obj);
typedef void *(MemAllocAlignedFunc)(u64 size, u64 alignment, void *alloc_obj);
typedef void *(MemReallocFunc)(void *ptr, u64 old_size, u64 new_size, void *alloc_obj);
typedef void *(MemReallocAlignedFunc)(void *ptr, u64 old_size, u64 new_size, u64 alignment, void *alloc_obj);
typedef void  (MemFreeFunc)(void **ptr, u64 size, void *alloc_obj);

typedef struct allocator Allocator;
struct allocator {
  void *obj;
  MemAllocFunc *alloc;
  MemAllocAlignedFunc *alloc_aligned;
  MemReallocFunc *realloc;
  MemReallocAlignedFunc *realloc_aligned;
  MemFreeFunc *free;
};

#ifdef WAPP_PLATFORM_CPP
#define wapp_mem_allocator_invalid(ALLOCATOR) ([&]() {      \
  Allocator alloc{};                                        \
  return memcmp(ALLOCATOR, &alloc, sizeof(Allocator)) == 0; \
}())
#else
#define wapp_mem_allocator_invalid(ALLOCATOR) (memcmp(ALLOCATOR, &((Allocator){0}), sizeof(Allocator)) == 0)
#endif // !WAPP_PLATFORM_CPP

void *wapp_mem_allocator_alloc(const Allocator *allocator, u64 size);
void *wapp_mem_allocator_alloc_aligned(const Allocator *allocator, u64 size, u64 alignment);
void *wapp_mem_allocator_realloc(const Allocator *allocator, void *ptr, u64 old_size, u64 new_size);
void *wapp_mem_allocator_realloc_aligned(const Allocator *allocator, void *ptr, u64 old_size,
                                         u64 new_size, u64 alignment);
void wapp_mem_allocator_free(const Allocator *allocator, void **ptr, u64 size);

#ifdef WAPP_PLATFORM_CPP
END_C_LINKAGE
#endif // !WAPP_PLATFORM_CPP

#endif // !MEM_ALLOCATOR_H