<?php
/**
 * Rules for product content (F-COMMERCE-03, 04).
 *
 * @package ForensixDigital
 */

declare(strict_types=1);

namespace ForensixDigital\Apps\Commerce;

defined( 'ABSPATH' ) || exit;

use ForensixDigital\Apps\Content\ContentRules;

/**
 * Decides what is missing on a product. Pure: it gets plain values and returns the names of the
 * problems, so it can be tested without WooCommerce.
 */
final class ProductRules {

	/**
	 * The problems of one product.
	 *
	 * @param array{title: string, content: string, excerpt: string, image: int, price: string, sku: string, variable: bool, gallery?: int, external?: bool, url?: string} $product Plain product values.
	 * @return array<int, string> Names: no_description, no_image, no_gallery, no_price, no_sku, no_buy_url, placeholder.
	 */
	public static function problems( array $product ): array {
		$found = array();
		if ( '' === trim( wp_strip_all_tags( $product['content'] ) ) && '' === trim( wp_strip_all_tags( $product['excerpt'] ) ) ) {
			$found[] = 'no_description';
		}
		if ( $product['image'] <= 0 ) {
			$found[] = 'no_image';
		} elseif ( isset( $product['gallery'] ) && $product['gallery'] <= 0 ) {
			// Only with a main image, so a product without any image is reported once.
			$found[] = 'no_gallery';
		}
		if ( '' === trim( $product['price'] ) && ! $product['variable'] ) {
			$found[] = 'no_price';
		}
		if ( '' === trim( $product['sku'] ) && ! $product['variable'] ) {
			$found[] = 'no_sku';
		}
		if ( ! empty( $product['external'] ) && '' === trim( $product['url'] ?? '' ) ) {
			$found[] = 'no_buy_url';
		}
		if ( array() !== ContentRules::placeholders( $product['title'] . ' ' . $product['content'] . ' ' . $product['excerpt'] ) ) {
			$found[] = 'placeholder';
		}
		return $found;
	}
}