<?php

namespace Glovario\Domain;

defined( 'ABSPATH' ) || exit;

final class TokenParser {
	const PATTERN = '/\{\{glvr:([a-z0-9_-]+)(?:\|format=([a-z]+))?\}\}/';

	public function replace( $content, $callback ) {
		$content = (string) $content;
		if ( false === strpos( $content, '{{glvr:' ) ) {
			return $content;
		}
		$result = preg_replace_callback(
			self::PATTERN,
			static function ( $matches ) use ( $callback ) {
				$format      = isset( $matches[2] ) ? BuiltinVariables::sanitize_date_format( $matches[2] ) : BuiltinVariables::DEFAULT_DATE_FORMAT;
				$replacement = call_user_func( $callback, sanitize_key( $matches[1] ), $matches[0], $format );
				return null === $replacement ? $matches[0] : (string) $replacement;
			},
			$content
		);
		return null === $result ? $content : $result;
	}

	public function keys( $content ) {
		if ( false === strpos( (string) $content, '{{glvr:' ) ) {
			return array();
		}
		preg_match_all( self::PATTERN, (string) $content, $matches );
		return array_values( array_unique( array_map( 'sanitize_key', $matches[1] ?? array() ) ) );
	}

	public function keys_in_html_text( $content ) {
		$keys  = array();
		$parts = preg_split( '~(<(?:script|style|pre|code)\b[^>]*>.*?</(?:script|style|pre|code)>|<!--.*?-->|<[^>]+>)~is', (string) $content, -1, PREG_SPLIT_DELIM_CAPTURE );
		foreach ( $parts as $index => $part ) {
			if ( 0 === $index % 2 ) {
				$keys = array_merge( $keys, $this->keys( $part ) );
			}
		}
		return array_values( array_unique( $keys ) );
	}
}