<?php
// TrailerHeader.php
// Created: 2022-02-14
// Updated: 2022-02-27

namespace Index\Http\Headers;

use Index\Http\HttpHeader;

class TrailerHeader {
    private array $headers;

    public function __construct(array $headers) {
        $this->headers = $headers;
    }

    public function getHeaders(): array {
        return $this->headers;
    }

    public function isTrailer(string $header): bool {
        return in_array(strtolower($header), $this->headers);
    }

    public static function parse(HttpHeader $header): TrailerHeader {
        $raw = explode(',', $header->getFirstLine());
        $headers = [];

        foreach($raw as $header)
            $headers[] = strtolower(trim($header));

        return new TrailerHeader(array_unique($headers));
    }
}