#include "darr.h"
#include "aliases.h"
#include <stdlib.h>
#include <string.h>

#define BASE_CAPACITY 2048

struct darr {
  u64 count;
  u64 capacity;
  void *items[];
};

bool darr_init(darr_t **darr) {
  u64 size = sizeof(darr_t) + sizeof(void *) * BASE_CAPACITY;

  *darr = malloc(size);
  if (!(*darr)) {
    return false;
  }

  memset((void *)(*darr), 0, size);

  (*darr)->capacity = BASE_CAPACITY;

  return true;
}

i64 darr_add(darr_t **darr, void *item) {
  if ((*darr)->count == (*darr)->capacity) {
    u64 new_size =
        sizeof(darr_t) + sizeof(void *) * ((*darr)->capacity + BASE_CAPACITY);

    darr_t *orig = *darr;

    *darr = realloc(*darr, new_size);
    if (!(*darr)) {
      *darr = orig;

      return INVALID_IDX;
    }

    (*darr)->capacity = orig->capacity + BASE_CAPACITY;
  }

  u64 index = (*darr)->count;

  (*darr)->items[((*darr)->count)++] = item;

  return index;
}

void **darr_get_items(darr_t *darr) { return darr->items; }

void darr_free(darr_t **darr) {
  if (!(*darr)) {
    return;
  }

  free(*darr);
  *darr = NULL;
}