<?php
//test
// Load configuration
$configFile = file_exists(__DIR__ . '/../custom/config.ini')
    ? __DIR__ . '/../custom/config.ini'
    : __DIR__ . '/config.ini';
$config = parse_ini_file($configFile, true);

$defaultLang = $config['languages']['default'] ?? 'no';
$availableLangs = array_map('trim', explode(',', $config['languages']['available'] ?? 'no'));

// Use user content if exists and has content, otherwise fall back to demo content
$userContentDir = $_SERVER['DOCUMENT_ROOT'];
$demoContentDir = __DIR__ . '/default/content';

// Check if user content directory has actual content (more than just . and ..)
$hasUserContent = false;
if (is_dir($userContentDir)) {
    $userFiles = scandir($userContentDir) ?: [];
    $userFiles = array_diff($userFiles, ['.', '..']);
    $hasUserContent = count($userFiles) > 0;
}

$contentDir = $hasUserContent ? realpath($userContentDir) : realpath($demoContentDir);

$requestUri = parse_url($_SERVER['REQUEST_URI'] ?? '', PHP_URL_PATH) ?: '/';
$hasTrailingSlash = str_ends_with($requestUri, '/') && $requestUri !== '/';
$requestPath = trim($requestUri, '/');

// Extract language from URL
$currentLang = $defaultLang;
$pathParts = explode('/', $requestPath);
if (!empty($pathParts[0]) && in_array($pathParts[0], $availableLangs) && $pathParts[0] !== $defaultLang) {
    $currentLang = $pathParts[0];
    array_shift($pathParts);
    $requestPath = implode('/', $pathParts);
}

// Use custom templates with fallback to defaults
$customBaseTemplate = dirname(__DIR__) . '/custom/templates/base.php';
$defaultBaseTemplate = __DIR__ . '/default/templates/base.php';
$baseTemplate = file_exists($customBaseTemplate) ? $customBaseTemplate : $defaultBaseTemplate;

$customPageTemplate = dirname(__DIR__) . '/custom/templates/page.php';
$defaultPageTemplate = __DIR__ . '/default/templates/page.php';
$pageTemplate = file_exists($customPageTemplate) ? $customPageTemplate : $defaultPageTemplate;

$customListTemplate = dirname(__DIR__) . '/custom/templates/list.php';
$defaultListTemplate = __DIR__ . '/default/templates/list.php';
$listTemplate = file_exists($customListTemplate) ? $customListTemplate : $defaultListTemplate;

// Find all content files in a directory (supporting language variants)
function findAllContentFiles(string $dir, string $lang, string $defaultLang): array {
    if (!is_dir($dir)) return [];
    
    $files = scandir($dir) ?: [];
    $contentFiles = [];
    $extensions = ['md', 'html', 'php'];
    
    foreach ($files as $file) {
        if ($file === '.' || $file === '..') continue;
        
        // Exclude system files from content
        if ($file === 'index.php') continue;
        
        $ext = pathinfo($file, PATHINFO_EXTENSION);
        if (!in_array($ext, $extensions)) continue;
        
        $filePath = "$dir/$file";
        if (!is_file($filePath)) continue;
        
        // Parse filename to check for language variant
        $parts = explode('.', $file);
        
        // Check if this is a language-specific file
        if (count($parts) >= 3) {
            // Pattern: name.lang.ext
            $fileLang = $parts[count($parts) - 2];
            if (in_array($fileLang, ['no', 'en'])) {
                // Only include if it matches current language
                if ($fileLang === $lang) {
                    $contentFiles[] = [
                        'path' => $filePath,
                        'name' => $file,
                        'sort_key' => $parts[0] // Use base name for sorting
                    ];
                }
                continue;
            }
        }
        
        // Default files (no language suffix) - include if current lang is default
        // or if no language-specific version exists
        $baseName = $parts[0];
        $hasLangVersion = false;
        
        if ($lang !== $defaultLang) {
            // Check if language-specific version exists
            foreach ($extensions as $checkExt) {
                if (file_exists("$dir/$baseName.$lang.$checkExt")) {
                    $hasLangVersion = true;
                    break;
                }
            }
        }
        
        if (!$hasLangVersion) {
            $contentFiles[] = [
                'path' => $filePath,
                'name' => $file,
                'sort_key' => $baseName
            ];
        }
    }
    
    // Sort by filename (alphanumerical)
    usort($contentFiles, fn($a, $b) => strnatcmp($a['sort_key'], $b['sort_key']));
    
    return array_column($contentFiles, 'path');
}


function resolveTranslatedPath(string $requestPath, string $contentDir, string $lang, string $defaultLang): string {
    // If default language, no translation needed
    if ($lang === $defaultLang) {
        return $requestPath;
    }

    $parts = explode('/', trim($requestPath, '/'));
    $resolvedParts = [];
    $currentPath = $contentDir;

    foreach ($parts as $segment) {
        if (empty($segment)) continue;

        // Check all subdirectories for slug matches
        $found = false;
        if (is_dir($currentPath)) {
            $subdirs = array_filter(
                scandir($currentPath) ?: [],
                fn($item) => !in_array($item, ['.', '..']) && is_dir("$currentPath/$item")
            );

            foreach ($subdirs as $dir) {
                $metadata = loadMetadata("$currentPath/$dir", $lang, $defaultLang);
                if ($metadata && isset($metadata['slug']) && $metadata['slug'] === $segment) {
                    $resolvedParts[] = $dir;
                    $currentPath .= "/$dir";
                    $found = true;
                    break;
                }
            }
        }

        // If no slug match, use segment as-is
        if (!$found) {
            $resolvedParts[] = $segment;
            $currentPath .= "/$segment";
        }
    }

    return implode('/', $resolvedParts);
}

function parseRequestPath(string $requestPath, string $contentDir, bool $hasTrailingSlash, string $lang, string $defaultLang): array {
    // Resolve translated slugs to actual directory names
    $resolvedPath = resolveTranslatedPath($requestPath, $contentDir, $lang, $defaultLang);
    $contentPath = rtrim($contentDir, '/') . '/' . ltrim($resolvedPath, '/');

    if (is_file($contentPath)) {
        return ['type' => 'file', 'path' => realpath($contentPath)];
    }

    if (is_dir($contentPath)) {
        // Check if directory has subdirectories
        $hasSubdirs = !empty(array_filter(
            scandir($contentPath) ?: [],
            fn($item) => !in_array($item, ['.', '..']) && is_dir("$contentPath/$item")
        ));

        // If directory has subdirectories, it's an article-type folder (list view)
        if ($hasSubdirs) {
            return ['type' => 'directory', 'path' => realpath($contentPath)];
        }
        
        // No subdirectories - it's a page-type folder
        // Find all content files in this directory
        $contentFiles = findAllContentFiles($contentPath, $lang, $defaultLang);
        
        if (!empty($contentFiles)) {
            return ['type' => 'page', 'path' => realpath($contentPath), 'files' => $contentFiles, 'needsSlash' => !$hasTrailingSlash];
        }
        
        // No content files found
        return ['type' => 'directory', 'path' => realpath($contentPath)];
    }

    return ['type' => 'not_found', 'path' => $contentPath];
}

function loadMetadata(string $dirPath, string $lang, string $defaultLang): ?array {
    $metadataFile = "$dirPath/metadata.ini";
    if (!file_exists($metadataFile)) return null;

    $metadata = parse_ini_file($metadataFile, true);
    if (!$metadata) return null;

    // Extract base metadata (non-section values)
    $baseMetadata = array_filter($metadata, fn($key) => !is_array($metadata[$key]), ARRAY_FILTER_USE_KEY);

    // If current language is not default, merge language-specific overrides
    if ($lang !== $defaultLang && isset($metadata[$lang]) && is_array($metadata[$lang])) {
        $baseMetadata = array_merge($baseMetadata, $metadata[$lang]);
    }

    return $baseMetadata ?: null;
}

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;
}

function loadTranslations(string $lang): array {
    $translationFile = dirname(__DIR__) . "/custom/languages/$lang.ini";
    if (file_exists($translationFile)) {
        return parse_ini_file($translationFile) ?: [];
    }
    return [];
}

function buildNavigation(string $contentDir, string $currentLang, string $defaultLang): array {
    $navItems = [];

    // Scan top-level directories in content
    $items = array_filter(
        scandir($contentDir) ?: [],
        fn($item) => !in_array($item, ['.', '..']) && is_dir("$contentDir/$item")
    );

    foreach ($items as $item) {
        $itemPath = "$contentDir/$item";
        $metadata = loadMetadata($itemPath, $currentLang, $defaultLang);

        // Check if this item should be in menu
        if (!$metadata || empty($metadata['menu'])) {
            continue;
        }

        // Check if content exists for current language
        if ($currentLang !== $defaultLang) {
            $contentFiles = findAllContentFiles($itemPath, $currentLang, $defaultLang);
            
            // If no content files, check if metadata has title for this language
            $hasContent = !empty($contentFiles) || ($metadata && isset($metadata['title']));

            if (!$hasContent) continue;
        }

        // Extract title and build URL
        $title = $metadata['title'] ?? extractTitle($itemPath, $currentLang, $defaultLang) ?? ucfirst($item);
        $langPrefix = $currentLang !== $defaultLang ? "/$currentLang" : '';

        // Use translated slug if available
        $urlSlug = ($currentLang !== $defaultLang && $metadata && isset($metadata['slug']))
            ? $metadata['slug']
            : $item;

        $navItems[] = [
            'title' => $title,
            'url' => $langPrefix . '/' . urlencode($urlSlug) . '/',
            'order' => (int)($metadata['menu_order'] ?? 999)
        ];
    }

    // Sort by menu_order
    usort($navItems, fn($a, $b) => $a['order'] <=> $b['order']);

    return $navItems;
}

function renderTemplate(string $content, int $statusCode = 200): void {
    global $baseTemplate, $contentDir, $currentLang, $defaultLang;

    // Build navigation for templates
    $navigation = buildNavigation($contentDir, $currentLang, $defaultLang);

    // Load frontpage metadata for home button label
    $frontpageMetadata = loadMetadata($contentDir, $currentLang, $defaultLang);
    $homeLabel = $frontpageMetadata['slug'] ?? 'Home';

    // Load translations
    $translations = loadTranslations($currentLang);

    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($ext, ['php', 'html', 'md'])) {
        ob_start();
        if ($ext === 'md') {
            if (!class_exists('Parsedown')) {
                require_once __DIR__ . '/vendor/Parsedown.php';
            }
            echo '<article>' . (new Parsedown())->text(file_get_contents($realPath)) . '</article>';
        } else {
            include $realPath;
        }
        $content = ob_get_clean();

        // Build navigation for templates
        $navigation = buildNavigation($contentDir, $currentLang, $defaultLang);

        // Load metadata for current page/directory
        $pageDir = dirname($realPath);
        $pageMetadata = loadMetadata($pageDir, $currentLang, $defaultLang);
        $pageTitle = $pageMetadata['title'] ?? null;

        // Load frontpage metadata for home button label
        $frontpageMetadata = loadMetadata($contentDir, $currentLang, $defaultLang);
        $homeLabel = $frontpageMetadata['slug'] ?? 'Home';

        // Load translations
        $translations = loadTranslations($currentLang);

        // 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
    $content = '';
    foreach ($filePaths as $filePath) {
        $ext = pathinfo($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 ($ext === 'html') {
            include $filePath;
        } elseif ($ext === 'php') {
            include $filePath;
        }
        $content .= ob_get_clean();
    }

    // Build navigation for templates
    $navigation = buildNavigation($contentDir, $currentLang, $defaultLang);

    // Load metadata for current page/directory
    $pageMetadata = loadMetadata($pageDir, $currentLang, $defaultLang);
    $pageTitle = $pageMetadata['title'] ?? null;

    // Load frontpage metadata for home button label
    $frontpageMetadata = loadMetadata($contentDir, $currentLang, $defaultLang);
    $homeLabel = $frontpageMetadata['slug'] ?? 'Home';

    // Load translations
    $translations = loadTranslations($currentLang);

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

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

// Check for assets in /custom/assets/ served at root level
$assetPath = dirname(__DIR__) . '/custom/assets/' . $requestPath;
if (file_exists($assetPath) && is_file($assetPath)) {
    header('Content-Type: ' . (mime_content_type($assetPath) ?: 'application/octet-stream'));
    readfile($assetPath);
    exit;
}

// Handle frontpage
if (empty($requestPath)) {
    // Find all content files in the root content directory
    $contentFiles = findAllContentFiles($contentDir, $currentLang, $defaultLang);
    
    if (!empty($contentFiles)) {
        renderMultipleFiles($contentFiles, $contentDir);
    }
}

// Parse and handle request
$parsedPath = parseRequestPath($requestPath, $contentDir, $hasTrailingSlash, $currentLang, $defaultLang);

switch ($parsedPath['type']) {
    case 'page':
        // Page-type folder with content files (no subdirectories)
        // Redirect to add trailing slash if needed
        if (!empty($parsedPath['needsSlash'])) {
            header('Location: ' . rtrim($_SERVER['REQUEST_URI'], '/') . '/', true, 301);
            exit;
        }
        renderMultipleFiles($parsedPath['files'], $parsedPath['path']);

    case 'file':
        // Direct file access or legacy single file
        // Redirect to add trailing slash if this is a directory-based page
        if (!empty($parsedPath['needsSlash'])) {
            header('Location: ' . rtrim($_SERVER['REQUEST_URI'], '/') . '/', true, 301);
            exit;
        }
        renderFile($parsedPath['path']);

    case 'directory':
        $dir = $parsedPath['path'];
        if (file_exists("$dir/index.php")) {
            renderFile("$dir/index.php");
        }

        // Check for page content files in this directory
        $pageContent = null;
        $contentFiles = findAllContentFiles($dir, $currentLang, $defaultLang);
        if (!empty($contentFiles)) {
            ob_start();
            foreach ($contentFiles as $file) {
                $ext = pathinfo($file, PATHINFO_EXTENSION);
                if ($ext === 'md') {
                    if (!class_exists('Parsedown')) {
                        require_once __DIR__ . '/vendor/Parsedown.php';
                    }
                    echo (new Parsedown())->text(file_get_contents($file));
                } else {
                    include $file;
                }
            }
            $pageContent = ob_get_clean();
        }

        // Load metadata for this directory
        $metadata = loadMetadata($dir, $currentLang, $defaultLang);

        // Select list template based on metadata page_template
        if (isset($metadata['page_template']) && !empty($metadata['page_template'])) {
            $templateName = $metadata['page_template'];
            // Add .php extension if not present
            if (!str_ends_with($templateName, '.php')) {
                $templateName .= '.php';
            }
            $customTemplate = dirname(__DIR__) . '/custom/templates/' . $templateName;
            $defaultTemplate = __DIR__ . '/default/templates/' . $templateName;
            
            if (file_exists($customTemplate)) {
                $listTemplate = $customTemplate;
            } elseif (file_exists($defaultTemplate)) {
                $listTemplate = $defaultTemplate;
            }
            // If template doesn't exist, fall back to default $listTemplate
        }

        // Default directory listing
        $subdirs = array_filter(
            scandir($dir) ?: [],
            fn($item) => !in_array($item, ['.', '..']) && is_dir("$dir/$item")
        );

        $items = array_filter(array_map(function($item) use ($dir, $requestPath, $currentLang, $defaultLang) {
            $itemPath = "$dir/$item";

            // Check if content exists for current language
            if ($currentLang !== $defaultLang) {
                $contentFiles = findAllContentFiles($itemPath, $currentLang, $defaultLang);
                if (empty($contentFiles)) return null;
            }

            $metadata = loadMetadata($itemPath, $currentLang, $defaultLang);
            $coverImage = findCoverImage($itemPath);
            $pdfFile = findPdfFile($itemPath);

            $title = $metadata['title'] ?? extractTitle($itemPath, $currentLang, $defaultLang) ?? $item;
            $date = null;
            if (isset($metadata['date'])) {
                $date = formatNorwegianDate($metadata['date']);
            } else {
                $date = extractDateFromFolder($item) ?: date("F d, Y", filemtime($itemPath));
            }

            $langPrefix = $currentLang !== $defaultLang ? "/$currentLang" : '';

            // Use translated slug if available, otherwise use folder name
            $urlSlug = ($currentLang !== $defaultLang && $metadata && isset($metadata['slug']))
                ? $metadata['slug']
                : $item;

            return [
                'title' => $title,
                'date' => $date,
                'url' => $langPrefix . '/' . trim($requestPath, '/') . '/' . urlencode($urlSlug),
                'cover' => $coverImage ? $langPrefix . '/' . trim($requestPath, '/') . '/' . urlencode($urlSlug) . '/' . $coverImage : null,
                'summary' => $metadata['summary'] ?? null,
                'pdf' => $pdfFile ? $langPrefix . '/' . trim($requestPath, '/') . '/' . urlencode($urlSlug) . '/' . $pdfFile : null,
                'redirect' => $metadata['redirect'] ?? null
            ];
        }, $subdirs));

        ob_start();
        include $listTemplate;
        $content = ob_get_clean();

        // Build navigation for base template
        $navigation = buildNavigation($contentDir, $currentLang, $defaultLang);

        include $baseTemplate;
        exit;

    case 'not_found':
        renderTemplate("<h1>404 Not Found</h1><p>The requested resource was not found.</p>", 404);
}