#include "stackarray.h"

stackarray_iterator stackarray_iterator_begin (stackarray_base *arr) {
	stackarray_iterator it;
	it.arr = arr;
	it.pos = 0;
	it.dir = 1;
	it.end = stackarray_iterator_end;
	it.value = stackarray_iterator_value;
	it.next = stackarray_iterator_next;
	it.prev = stackarray_iterator_prev;
	return it;
}

stackarray_iterator stackarray_iterator_rbegin (stackarray_base *arr) {
	stackarray_iterator it;
	it.arr = arr;
	it.pos = arr->length - 1;
	it.dir = -1;
	it.end = stackarray_iterator_end;
	it.value = stackarray_iterator_value;
	it.next = stackarray_iterator_next;
	it.prev = stackarray_iterator_prev;
	return it;
}

b8 stackarray_iterator_end (const stackarray_iterator *it) {
	return it->dir == 1 ? it->pos >= (i32)it->arr->length : it->pos < 0;
}

void *stackarray_iterator_value (const stackarray_iterator *it) {
	return (void *)(((u64)it->arr->p_data) + it->arr->stride * it->pos);
}

void stackarray_iterator_next (stackarray_iterator *it) {
	it->pos += it->dir;
}

void stackarray_iterator_prev (stackarray_iterator *it) {
	it->pos -= it->dir;
}