#include <stdio.h>
#include <stdlib.h>
#include "array.h"

Array array_init(size_t capacity) {
  return (Array) {
    .items = calloc(capacity, sizeof(int)),
    .capacity = capacity,
    .length = 0
  };
}

int array_push(Array *a, int value) {
  if (a->length == a->capacity) {
    array_resize(a, a->capacity * 1.5);
  }
  a->items[a->length++] = value;
  return 0;
}

int array_pop(Array *a) {
    if (a->length > 0) {
      int item = a->items[a->length-1];
      size_t capacity = a->capacity - (a->capacity - a->length);
        if (array_resize(a, capacity) == EXIT_SUCCESS)
            a->length--;
        return item;
    }
    return 1;
}

int array_resize(Array *a, size_t capacity) {
  a->items = realloc(a->items, capacity * sizeof(int));
  if (a->items == NULL) {
    fprintf(stderr, "Memory reallocation failed\n");
    return EXIT_FAILURE;
  }
  a->capacity = capacity;
  return EXIT_SUCCESS;
}

void array_free(Array *a) {
  free(a->items);
  a->items = NULL;
  a->length = a->capacity = 0;
}

void array_print(Array *a) {
    printf("Capacity: %zu\t length: %zu\n",
           a->capacity, a->length);
    puts("Array items:");
    for (int i = 0; i < a->capacity; ++i) {
        if (i > a->length) {
            printf("%i: unused\n", i);
        } else {
            printf("%i: %i\n", i, a->items[i]);
        }
    }
}