<?php
declare(strict_types=1);

namespace Esun3d\LanguageUrlStoreResolver\Model;

class RequestPathProcessor
{
    /**
     * @var LanguageResolver
     */
    private $languageResolver;

    public function __construct(LanguageResolver $languageResolver)
    {
        $this->languageResolver = $languageResolver;
    }

    public function stripLanguagePrefix(string $pathInfo): string
    {
        if ($this->languageResolver->resolveFromPath($pathInfo) === null) {
            return $this->normalizePath($pathInfo);
        }

        $hasTrailingSlash = substr($pathInfo, -1) === '/';
        $pathInfo = '/' . ltrim($pathInfo, '/');
        $segments = explode('/', trim($pathInfo, '/'), 2);
        $remainingPath = $segments[1] ?? '';

        if ($remainingPath === '') {
            return '/';
        }

        $path = '/' . ltrim($remainingPath, '/');

        return $hasTrailingSlash && substr($path, -1) !== '/' ? $path . '/' : $path;
    }

    public function replaceLanguagePrefix(string $pathInfo, string $language): string
    {
        $remainingPath = $this->stripLanguagePrefix($pathInfo);
        $language = strtolower(trim($language));

        if ($remainingPath === '/') {
            return '/' . $language . '/';
        }

        return '/' . $language . $remainingPath;
    }

    private function normalizePath(string $pathInfo): string
    {
        $pathInfo = '/' . ltrim($pathInfo, '/');

        return $pathInfo === '' ? '/' : $pathInfo;
    }
}