<?php
/** Compare product URL strings without making network requests. */
namespace AdParityLite;

defined( 'ABSPATH' ) || exit;

final class ProductLink {
	/** Match URL origin exactly, including scheme and effective port. */
	public static function same_origin( string $url, string $home ): bool {
		$a = wp_parse_url( $url );
		$b = wp_parse_url( $home );
		if ( ! is_array( $a ) || ! is_array( $b ) || isset( $a['user'] ) || isset( $a['pass'] ) || empty( $a['host'] ) || empty( $b['host'] ) ) {
			return false;
		}
		$scheme = strtolower( $a['scheme'] ?? '' );
		$port_a = $a['port'] ?? ( 'https' === $scheme ? 443 : 80 );
		$port_b = $b['port'] ?? ( 'https' === ( $b['scheme'] ?? '' ) ? 443 : 80 );
		return in_array( $scheme, array( 'http', 'https' ), true ) && strtolower( $b['scheme'] ?? '' ) === $scheme && strtolower( $a['host'] ) === strtolower( $b['host'] ) && $port_b === $port_a;
	}

	/** Accept only canonical product path and product/variation selector values; ignore tracking parameters. */
	public static function same_product( string $feed_url, string $canonical ): bool {
		if ( ! self::same_origin( $feed_url, $canonical ) ) {
			return false;
		}
		$a = wp_parse_url( $feed_url );
		$b = wp_parse_url( $canonical );
		if ( untrailingslashit( $a['path'] ?? '/' ) !== untrailingslashit( $b['path'] ?? '/' ) ) {
			return false;
		}
		parse_str( $a['query'] ?? '', $aq );
		parse_str( $b['query'] ?? '', $bq );
		$select = static function ( array $query ): array {
			$result = array();
			foreach ( $query as $key => $value ) {
				if ( ! str_starts_with( $key, 'utm_' ) && ! in_array( $key, array( 'gclid', 'dclid', 'fbclid', 'msclkid', 'srsltid', '_ga', '_gl' ), true ) ) {
					$result[ $key ] = $value;
				}
			}
			ksort( $result );
			return $result;
		};
		return $select( $aq ) === $select( $bq );
	}
}