<?php
/**
 * Settings of the Google tools (F-GOOGLE-01, 02).
 *
 * @package ForensixDigital
 */

declare(strict_types=1);

namespace ForensixDigital\Apps\Google;

defined( 'ABSPATH' ) || exit;

/**
 * The three codes the owner copies from Google, and two choices about how the tag behaves.
 * Every code is checked against the exact shape Google uses, so nothing else can be printed
 * into the page.
 */
final class GoogleConfig {

	public const SCOPE = 'google';

	/**
	 * Defaults. Nothing is output until a code is saved.
	 *
	 * @return array<string, mixed>
	 */
	public static function defaults(): array {
		return array(
			'verification'   => '',
			'ga4_id'         => '',
			'gtm_id'         => '',
			'consent_denied' => false,
			'track_editors'  => false,
		);
	}

	/**
	 * Cleans values before they are saved.
	 *
	 * @param array<string, mixed> $values Values.
	 * @return array<string, mixed>
	 */
	public static function sanitize( array $values ): array {
		$values = array_merge( self::defaults(), $values );
		return array(
			'verification'   => self::verification( (string) $values['verification'] ),
			'ga4_id'         => self::match( (string) $values['ga4_id'], '/^G-[A-Z0-9]{6,12}$/' ),
			'gtm_id'         => self::match( (string) $values['gtm_id'], '/^GTM-[A-Z0-9]{4,10}$/' ),
			'consent_denied' => (bool) $values['consent_denied'],
			'track_editors'  => (bool) $values['track_editors'],
		);
	}

	/**
	 * The verification code from either the bare code or the whole meta tag Google shows.
	 *
	 * @param string $raw What the owner pasted.
	 */
	public static function verification( string $raw ): string {
		$raw = trim( $raw );
		if ( preg_match( '/content\s*=\s*["\']([^"\']+)["\']/i', $raw, $found ) ) {
			$raw = $found[1];
		}
		return preg_match( '/^[A-Za-z0-9_-]{20,100}$/', $raw ) ? $raw : '';
	}

	/**
	 * Keeps a value only when it has the exact shape, after trimming and upper-casing.
	 *
	 * @param string $raw     Pasted value.
	 * @param string $pattern Pattern of the allowed shape.
	 */
	private static function match( string $raw, string $pattern ): string {
		$raw = strtoupper( trim( $raw ) );
		return preg_match( $pattern, $raw ) ? $raw : '';
	}
}