#ifndef BASE_STACK_H
#define BASE_STACK_H

#if defined(PLATFORM_UNIX)
#define StackCreate(size) unix_stack_create(size)
#define StackDestroy(stack) unix_stack_destroy(stack)
#elif defined(PLATFORM_WINDOWS)
#define StackCreate(size) win32_stack_create(size)
#define StackDestroy(stack) win32_stack_destroy(stack)
#endif

//-

typedef struct MemStackHeader MemStackHeader;
typedef struct MemStack MemStack;

struct MemStackHeader {
    u8 padding;
    u8 previous_offset;
};

struct MemStack {
    MemStackHeader *header;
    u64 current_offset;
    u64 capacity;
    u8 *base_position; // TODO: why is this a (u8 *)?
};

//-

internal MemStack *stack_push_align(MemStack *stack, u64 size, u8 alignment);
internal MemStack *stack_resize_align(MemStack *stack, void *pointer, u64 old_size, u64 new_size,
                                      u8 alignment);
internal void *stack_push(MemStack *stack, u64 size);
internal void stack_pop(MemStack *stack, void *pointer);
internal void stack_clear(MemStack *stack);
internal u8 calculate_padding(u64 pointer, u8 alignment, u64 header_size);
internal MemStack *arena_to_stack(MemArena *arena, u64 size, u64 alignment);


#define ArenaToStack(arena, size) arena_to_stack(arena, size);
#define StackPushStruct(stack, type) (type *)stack_push((stack), sizeof(type))
#define StackPushArray(stack, type, len) (type *)stack_push((stack), sizeof(type) * (len))
#define StackPop(stack, pointer) stack_pop(stack, pointer)
#define StackClear(stack) stack_clear(stack)

#endif // BASE_STACK_H