#ifndef MEM_UTILS_H
#define MEM_UTILS_H

#include "aliases.h"
#include "platform.h"

#if defined(WAPP_PLATFORM_WINDOWS)
#define WIN32_LEAN_AND_MEAN
#include <Windows.h>
#include <memoryapi.h>
#elif defined(WAPP_PLATFORM_POSIX)
#include <sys/mman.h>
#else
#error "Unrecognised platform"
#endif

#ifdef __cplusplus
extern "C" {
#endif // __cplusplus

typedef enum mem_access {
  WAPP_MEM_ACCESS_NONE,
  WAPP_MEM_ACCESS_READ_ONLY,
  WAPP_MEM_ACCESS_EXEC_ONLY,
  WAPP_MEM_ACCESS_READ_WRITE,
  WAPP_MEM_ACCESS_READ_EXEC,
  WAPP_MEM_ACCESS_READ_WRITE_EXEC,
} MemAccess;

typedef enum mem_alloc_flags {
#if defined(WAPP_PLATFORM_WINDOWS)
  WAPP_MEM_ALLOC_RESERVE = MEM_RESERVE,
  WAPP_MEM_ALLOC_COMMIT = MEM_COMMIT,
#elif defined(WAPP_PLATFORM_LINUX) || defined(WAPP_PLATFORM_GNU)
  WAPP_MEM_ALLOC_RESERVE = 0,
  WAPP_MEM_ALLOC_COMMIT = MAP_POPULATE,
#elif defined(WAPP_PLATFORM_FREE_BSD)
  WAPP_MEM_ALLOC_RESERVE = 0,
  WAPP_MEM_ALLOC_COMMIT = MAP_PREFAULT_READ,
#elif defined(WAPP_PLATFORM_BSD) || defined(WAPP_PLATFORM_UNIX) ||             \
    defined(WAPP_PLATFORM_APPLE)
  WAPP_MEM_ALLOC_RESERVE = 0,
  WAPP_MEM_ALLOC_COMMIT = 0,
#endif
} MemAllocFlags;

typedef enum mem_init_type {
  WAPP_MEM_INIT_UNINITIALISED,
  WAPP_MEM_INIT_INITIALISED,
} MemInitType;

void *wapp_mem_util_align_forward(void *ptr, u64 alignment);
void *wapp_mem_util_alloc(void *addr, u64 size, MemAccess access,
                          MemAllocFlags flags, MemInitType type);
void wapp_mem_util_free(void *ptr, u64 size);

#ifdef __cplusplus
}
#endif // __cplusplus

#endif // !MEM_UTILS_H