<?php

function extractTitle(string $filePath, string $lang, string $defaultLang): ?string {
    $files = findAllContentFiles($filePath, $lang, $defaultLang);
    if (empty($files)) return null;

    // Check the first content file for a title
    $file = $files[0];
    $ext = pathinfo($file, PATHINFO_EXTENSION);
    $content = file_get_contents($file);

    if ($ext === 'md' && preg_match('/^#\s+(.+)$/m', $content, $matches)) {
        return trim($matches[1]);
    }
    if (in_array($ext, ['html', 'php']) && preg_match('/<h1[^>]*>(.*?)<\/h1>/i', $content, $matches)) {
        return strip_tags($matches[1]);
    }
    return null;
}

function formatNorwegianDate(string $dateString): string {
    if (preg_match('/^(\d{4})-(\d{2})-(\d{2})/', $dateString, $matches)) {
        $months = ['januar', 'februar', 'mars', 'april', 'mai', 'juni', 'juli', 'august', 'september', 'oktober', 'november', 'desember'];
        $day = (int)$matches[3];
        $month = $months[(int)$matches[2] - 1];
        $year = $matches[1];
        return "$day. $month $year";
    }
    return $dateString;
}

function extractDateFromFolder(string $folderName): ?string {
    if (preg_match('/^(\d{4})-(\d{2})-(\d{2})-/', $folderName, $matches)) {
        return formatNorwegianDate($matches[1] . '-' . $matches[2] . '-' . $matches[3]);
    }
    return null;
}

function findCoverImage(string $dirPath): ?string {
    $extensions = ['jpg', 'jpeg', 'png', 'webp', 'gif'];
    foreach ($extensions as $ext) {
        if (file_exists("$dirPath/cover.$ext")) {
            return "cover.$ext";
        }
    }
    return null;
}

function findPdfFile(string $dirPath): ?string {
    $files = scandir($dirPath) ?: [];
    foreach ($files as $file) {
        if (pathinfo($file, PATHINFO_EXTENSION) === 'pdf') {
            return $file;
        }
    }
    return null;
}