#include "arraylist.h"
#include <stdbool.h>
#include <stdlib.h>
#include <string.h>

ArrayListResult arraylist_init(size_t capacity, size_t elem_size) {
    if (capacity == 0) {
        return (ArrayListResult) {
            .is_valid = false,
            .err = ARRLIST_INVALID_CAPACITY};
    }

    if (elem_size == 0) {
        return (ArrayListResult) {
            .is_valid = false,
            .err = ARRLIST_INVALID_ELEM_SIZE,
        };
    }

    ArrayList arr = {
        .data = malloc(capacity * elem_size),
        .capacity = capacity,
        .elem_size = elem_size,
        .len = 0
    };

    if (arr.data == NULL) {
        return (ArrayListResult) {
            .is_valid = false,
            .err = ARRLIST_BAD_ALLOC,
        };
    }

    return (ArrayListResult) {.is_valid = true, .array = arr};
}

ArrayListErr arraylist_destroy(ArrayList *arr) {
    if (arr == NULL) {
        return ARRLIST_NULL_ARG;
    }

    arr->capacity = 0;
    arr->elem_size = 0;
    arr->len = 0;
    free(arr->data);
    arr->data = NULL;
    return ARRLIST_OK;
}

ArrayListErr arraylist_clear(ArrayList *arr) {
    if (arr == NULL) {
        return ARRLIST_NULL_ARG;
    }

    memset(arr->data, 0, arr->capacity * arr->elem_size);
    arr->capacity = 0;
    arr->elem_size = 0;
    arr->len = 0;
    return ARRLIST_OK;
}