folderweb/app/rendering.php

<?php

function prepareTemplateContext(): array {
    global $contentDir, $currentLang, $defaultLang;
    
    return [
        'navigation' => buildNavigation($contentDir, $currentLang, $defaultLang),
        'homeLabel' => loadMetadata($contentDir, $currentLang, $defaultLang)['slug'] ?? 'Home',
        'translations' => loadTranslations($currentLang)
    ];
}

function renderContentFile(string $filePath): string {
    $ext = pathinfo($filePath, PATHINFO_EXTENSION);
    
    ob_start();
    if ($ext === 'md') {
        if (!class_exists('Parsedown')) {
            require_once __DIR__ . '/vendor/Parsedown.php';
        }
        echo '<article>' . (new Parsedown())->text(file_get_contents($filePath)) . '</article>';
    } elseif (in_array($ext, ['html', 'php'])) {
        include $filePath;
    }
    return ob_get_clean();
}

function renderTemplate(string $content, int $statusCode = 200): void {
    global $baseTemplate;
    
    extract(prepareTemplateContext());
    
    http_response_code($statusCode);
    include $baseTemplate;
    exit;
}

function renderFile(string $filePath): void {
    global $baseTemplate, $pageTemplate, $contentDir, $currentLang, $defaultLang;

    $realPath = realpath($filePath);
    if (!$realPath || !str_starts_with($realPath, $contentDir) || !is_readable($realPath)) {
        renderTemplate("<article><h1>403 Forbidden</h1><p>Access denied.</p></article>", 403);
    }

    $ext = pathinfo($realPath, PATHINFO_EXTENSION);

    if (in_array($ext, CONTENT_EXTENSIONS)) {
        $content = renderContentFile($realPath);

        // Prepare template variables
        extract(prepareTemplateContext());
        
        $pageDir = dirname($realPath);
        $pageMetadata = loadMetadata($pageDir, $currentLang, $defaultLang);
        $pageTitle = $pageMetadata['title'] ?? null;

        // Wrap content with page template
        ob_start();
        include $pageTemplate;
        $content = ob_get_clean();

        // Wrap with base template
        include $baseTemplate;
        exit;
    }

    // Serve other file types directly
    header('Content-Type: ' . (mime_content_type($realPath) ?: 'application/octet-stream'));
    readfile($realPath);
    exit;
}

function renderMultipleFiles(array $filePaths, string $pageDir): void {
    global $baseTemplate, $pageTemplate, $contentDir, $currentLang, $defaultLang;

    // Validate all files are safe
    foreach ($filePaths as $filePath) {
        $realPath = realpath($filePath);
        if (!$realPath || !str_starts_with($realPath, $contentDir) || !is_readable($realPath)) {
            renderTemplate("<article><h1>403 Forbidden</h1><p>Access denied.</p></article>", 403);
        }
    }

    // Render all content files in order
    $content = implode('', array_map('renderContentFile', $filePaths));

    // Prepare template variables
    extract(prepareTemplateContext());
    
    $pageMetadata = loadMetadata($pageDir, $currentLang, $defaultLang);
    $pageTitle = $pageMetadata['title'] ?? null;

    // Wrap content with page template
    ob_start();
    include $pageTemplate;
    $content = ob_get_clean();

    // Wrap with base template
    include $baseTemplate;
    exit;
}