<?php
/**
 * Logging helper.
 *
 * @package Recast\WCS
 */

namespace Recast\WCS\Support;

defined( 'ABSPATH' ) || exit;

/**
 * Thin wrapper over WC_Logger with the 'recast' source and payment-data redaction.
 */
final class Logger {

	const SOURCE = 'recast';

	/**
	 * Context keys whose values are never written to the log.
	 *
	 * @var string[]
	 */
	private static $redact_patterns = array( 'token', 'secret', 'card', 'payment_meta', 'password', 'key' );

	/**
	 * Logs a message.
	 *
	 * @param string               $level   emergency|alert|critical|error|warning|notice|info|debug.
	 * @param string               $message Message.
	 * @param array<string, mixed> $context Context, redacted before logging.
	 * @return void
	 */
	public static function log( $level, $message, array $context = array() ) {
		if ( ! function_exists( 'wc_get_logger' ) ) {
			return;
		}
		$context           = self::redact( $context );
		$context['source'] = self::SOURCE;
		wc_get_logger()->log( $level, $message, $context );
	}

	/**
	 * Info shortcut.
	 *
	 * @param string               $message Message.
	 * @param array<string, mixed> $context Context.
	 * @return void
	 */
	public static function info( $message, array $context = array() ) {
		self::log( 'info', $message, $context );
	}

	/**
	 * Warning shortcut.
	 *
	 * @param string               $message Message.
	 * @param array<string, mixed> $context Context.
	 * @return void
	 */
	public static function warning( $message, array $context = array() ) {
		self::log( 'warning', $message, $context );
	}

	/**
	 * Error shortcut.
	 *
	 * @param string               $message Message.
	 * @param array<string, mixed> $context Context.
	 * @return void
	 */
	public static function error( $message, array $context = array() ) {
		self::log( 'error', $message, $context );
	}

	/**
	 * Replaces sensitive values recursively.
	 *
	 * @param array<string, mixed> $context Context.
	 * @return array<string, mixed>
	 */
	public static function redact( array $context ) {
		foreach ( $context as $key => $value ) {
			if ( is_array( $value ) ) {
				$context[ $key ] = self::redact( $value );
				continue;
			}
			foreach ( self::$redact_patterns as $pattern ) {
				if ( false !== stripos( (string) $key, $pattern ) ) {
					$context[ $key ] = '[redacted]';
					break;
				}
			}
		}
		return $context;
	}
}