<?php
declare(strict_types=1);

namespace RtbPanelConnector\Events;

use RtbPanelConnector\Helpers\Uid;

defined('ABSPATH') || exit;

/**
 * BASKET_ADD event.
 */
class BasketAddEvent extends BaseEvent{
	public const EVENT_TYPE = 'basketadd';

	private static function getEventBody(int $offerId): array
	{
		return [
			'eventType' => self::EVENT_TYPE,
			'offerId' => $offerId
		];

	}

	public static function build(): array
	{
		$ids = array();

		// phpcs:disable WordPress.Security.NonceVerification.Recommended -- Read-only inspection of WooCommerce add-to-cart requests is used for analytics.
		$request = wp_unslash($_REQUEST);
		// phpcs:enable WordPress.Security.NonceVerification.Recommended

		// Both carry the parent product ID for variations, which is the ID the feed exports.
		// Classic add-to-cart flow.
		if (isset($request['add-to-cart'])) {
			$ids[] = (int) $request['add-to-cart'];
		}

		// Some forms/AJAX send product_id.
		if (isset($request['product_id'])) {
			$ids[] = (int) $request['product_id'];
		}

		// Grouped products: quantity[product_id] => qty.
		if (!empty($request['quantity']) && is_array($request['quantity'])) {
			$quantities = array_map('intval', $request['quantity']);
			foreach ($quantities as $pid => $qty) {
				$pid = (int) $pid;
				$qty = (int) $qty;
				if ($pid > 0 && $qty > 0) {
					$ids[] = $pid;
				}
			}
		}

		// Normalize, unique, positive only.
		$ids = array_values(array_unique(array_filter(array_map('intval', $ids), static function (int $v): bool {
			return $v > 0;
		})));

		if (empty($ids)) {
			return [];
		}

		$events = [];
		foreach ($ids as $id) {
			$events[] = self::getEventBody($id);
		}

		$events[] = Uid::buildTag();

		return $events;
	}
}