<?php

function resolveTemplate(string $templateName): string {
    $customTemplate = dirname(__DIR__) . "/custom/templates/$templateName.php";
    $defaultTemplate = __DIR__ . "/default/templates/$templateName.php";
    return file_exists($customTemplate) ? $customTemplate : $defaultTemplate;
}

function getSubdirectories(string $dir): array {
    if (!is_dir($dir)) return [];
    return array_filter(
        scandir($dir) ?: [],
        fn($item) => !in_array($item, ['.', '..']) && is_dir("$dir/$item")
    );
}

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 {
    // PHP 8.4: array_find() - cleaner than foreach
    $found = array_find(
        COVER_IMAGE_EXTENSIONS,
        fn($ext) => file_exists("$dirPath/cover.$ext")
    );
    return $found ? "cover.$found" : null;
}

function findPdfFile(string $dirPath): ?string {
    // PHP 8.4: array_find() with glob
    $pdfs = glob("$dirPath/*.pdf") ?: [];
    return $pdfs ? basename($pdfs[0]) : null;
}