/*
 * Copyright (C) 2025  Johnny Richard <johnny@johnnyrichard.com>
 *
 * This program is free software: you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation, either version 3 of the License, or
 * (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program.  If not, see <https://www.gnu.org/licenses/>.
 */
#include <assert.h>
#include <stdint.h>
#include <stdlib.h>

#include "array.h"

void*
array_new(size_t item_size)
{
    array_header_t* h =
        malloc((item_size * ARRAY_INITIAL_CAPACITY) + sizeof(array_header_t));
    if (h == NULL) {
        return NULL;
    }
    h->length = 0;
    h->item_size = item_size;
    h->capacity = ARRAY_INITIAL_CAPACITY;
    return h + sizeof(array_header_t);
}

array_header_t*
array_get_header(void* arr)
{
    return (array_header_t*)arr - sizeof(array_header_t);
}

void*
array_grow(void* arr)
{
    array_header_t* h = array_get_header(arr);
    h->capacity *= 2;
    h = realloc(h, sizeof(array_header_t) + (h->capacity * h->item_size));
    return h + sizeof(array_header_t);
}

size_t
array_length(void* arr)
{
    assert(arr);
    array_header_t* header = array_get_header(arr);
    return header->length;
}