cake-carts/src/Controller/Component/ShoppingCartComponent.php

<?php
declare(strict_types=1);

namespace CakeCarts\Controller\Component;

use Cake\Controller\Component;
use Cake\Core\Configure;
use Cake\Datasource\EntityInterface;
use Cake\Datasource\Exception\RecordNotFoundException;
use Cake\Event\EventInterface;
use Cake\ORM\Table;
use Cake\ORM\TableRegistry;
use CakeCarts\Model\Enum\CartTypeId;
use CakeCarts\Model\Table\CartsTable;

/**
 * ShoppingCart component
 */
class ShoppingCartComponent extends Component {

	protected string $userIdField;

	protected CartsTable|Table $Carts;

	/**
     * @param array $config
     * @return void
     */
	public function initialize(array $config): void {
		parent::initialize($config); // TODO: Change the autogenerated stub

		$this->userIdField = Configure::readOrFail('CakeCarts.Users.user_id') === 'uuid' ? 'user_id_uuid' : 'user_id';
		$this->Carts = TableRegistry::getTableLocator()->get(Configure::readOrFail('CakeCarts.Carts.table'));
	}

	/**
     * Default configuration.
     *
     * @var array<string, mixed>
     */
	protected array $_defaultConfig = [];

	/**
     * @param \Cake\Event\EventInterface $event
     * @return void
     */
	public function beforeFilter(EventInterface $event): void {
		if (!$this->_isActionEnabled()) {
			return;
		}

		$sessionId = $this->getSessionId();
		$cart = $this->findExistingCartOrCreate($sessionId);

		$this->getController()->set(compact('cart'));
	}

	/**
     * @param string $cartId
     *
     * @return \Cake\Datasource\EntityInterface|\CakeCarts\Model\Entity\Cart
     */
	public function getCartForUserById(string $cartId) {
		$identity = $this->getController()->getRequest()->getAttribute('identity');
		$sessionId = $this->getSessionId();

		$cartsQ = $this->Carts
			->find()
			->contain(['CartItems'])
			->where(['Carts.id' => $cartId]);
		if ($identity) {
			$cartsQ->where([$this->userIdField => $identity->getIdentifier()]);
		} else {
			$cartsQ->where(['session_id' => $sessionId]);
		}

		return $cartsQ->firstOrFail();
	}

	/**
     * @param string $sessionId
     * @param int|null $cartTypeId
     * @return EntityInterface|\CakeCarts\Model\Entity\Cart
     */

	public function findExistingCartOrCreate(string $sessionId, int|null $cartTypeId = null) {
		$identity = $this->getController()->getRequest()->getAttribute('identity');

		$cartTypeId = $cartTypeId ?? CartTypeId::Cart->value;

		$cart = $this->Carts
			->findBySessionId($sessionId)
			->contain(['CartItems'])
			->where(['cart_type_id' => $cartTypeId])
			->first();

		if (isset($cart) && isset($identity) && !isset($cart[$this->userIdField])) {
			$cart = $this->Carts->patchEntity($cart, [
				$this->userIdField => $identity->getIdentifier(),
			]);

			$cart = $this->Carts->saveOrFail($cart);
		}
		if (!isset($cart)) {
			$cart = $this->Carts->newEntity([
				'cart_type_id' => $cartTypeId,
				'session_id' => $sessionId,
				$this->userIdField => isset($identity) ? $identity->getIdentifier() : null,
				'num_items' => 0,
				'cart_items' => [],
			]);

			$cart = $this->Carts->saveOrFail($cart);
		}

		return $cart;
	}

	/**
     * @return string
     */
	public function getUserIdField() {
		return $this->userIdField;
	}

	/**
     * @return string
     */
	public function getSessionId(): string {
		if (!$this->getController()->getRequest()->getSession()->started()) {
			$this->getController()->getRequest()->getSession()->start();
		}

		if (!$this->getController()->getRequest()->getSession()->check('CakeCarts.session_id')) {
			$this->getController()->getRequest()->getSession()->write('CakeCarts.session_id', $this->getController()->getRequest()->getSession()->id());
		}

		return $this->getController()->getRequest()->getSession()->read('CakeCarts.session_id');
	}

	/**
     * @param \Cake\Datasource\EntityInterface $cart
     * @throws \Cake\Datasource\Exception\RecordNotFoundException
     *
     * @return void
     */
	public function checkIfIsOwnCart(EntityInterface $cart): void {
		$identity = $this->getController()->getRequest()->getAttribute('identity');

		if (!isset($identity) && isset($cart->session_id) && ($cart->session_id != $this->getSessionId())) {
			throw new RecordNotFoundException();
		}
		if (isset($identity) && $identity->getIdentifier() != $cart->get($this->getUserIdField())) {
			throw new RecordNotFoundException();
		}
	}

	/**
     * @return bool
     */
	protected function _isActionEnabled(): bool {
		$actions = $this->getConfig('actions');
		if (is_bool($actions)) {
			return $actions;
		}

		return in_array($this->getController()->getRequest()->getParam('action'), (array)$actions, true);
	}

}