class SkuItem implements JsonSerializable
{
    /**
     * Item data
     *
     * @var array
     */
    protected $item = [];

    /**
     * SKU data
     *
     * @var array
     */
    protected $sku = [];

    /**
     * The SKU meta ID
     *
     * @var int
     */
    protected $skuMetaId;

    /**
     * Constructs an SKU item
     *
     * @author Evan D Shaw <evandanielshaw@gmail.com>
     * @param int $skuMetaId
     * @return void
     */
    public function __construct($skuMetaId) {
        $this->skuMetaId = (int)$skuMetaId;
        $data = Utils::getSkuData($this->skuMetaId);
        if (!empty($data)) {
            $this->item = $data['item'];
            $this->sku = $data['sku'];
        }
    }

    /**
     * Returns JSON serializable array
     *
     * @author Evan D Shaw <evandanielshaw@gmail.com>
     * @return array
     */
    public function jsonSerialize() {
        return [
            'postId' => !empty($this->sku) ? $this->sku['post_id'] : null,
            'skuMetaId' => $this->skuMetaId,
            'welitemSku' => $this->sku,
            'welitem' => $this->item,
        ];
    }

    /**
     * Getter for `$this->postId`
     *
     * @author Evan D Shaw <evandanielshaw@gmail.com>
     * @return int|null
     */
    public function getPostId() {
        return !empty($this->sku) ? $this->sku['post_id'] : null;
    }

    /**
     * Getter for `$this->skuMetaId`
     *
     * @author Evan D Shaw <evandanielshaw@gmail.com>
     * @return int
     */
    public function getSkuMetaId() {
        return $this->skuMetaId;
    }

    /**
     * Returns Welcart item data
     *
     * @author Evan D Shaw <evandanielshaw@gmail.com>
     * @return array
     */
    public function getItemData() {
        return $this->item;
    }

    /**
     * Returns Welcart item SKU data
     *
     * @author Evan D Shaw <evandanielshaw@gmail.com>
     * @return array
     */
    public function getSkuData() {
        return $this->sku;
    }
}