<?php

require_once 'config.php';

$config = include 'config.php';

class CodePressCMS {
    private $config;
    private $menu = [];
    private $searchResults = [];
    
    public function __construct($config) {
        $this->config = $config;
        $this->buildMenu();
        
        if (isset($_GET['search'])) {
            $this->performSearch($_GET['search']);
        }
    }
    
    private function buildMenu() {
        $this->menu = $this->scanDirectory($this->config['content_dir'], '');
    }
    
    private function scanDirectory($dir, $prefix) {
        if (!is_dir($dir)) return [];
        
        $items = scandir($dir);
        sort($items);
        $result = [];
        
        foreach ($items as $item) {
            if ($item[0] === '.') continue;
            
            $path = $dir . '/' . $item;
            $relativePath = $prefix ? $prefix . '/' . $item : $item;
            
            if (is_dir($path)) {
                $result[] = [
                    'type' => 'folder',
                    'title' => ucfirst($item),
                    'path' => $relativePath,
                    'children' => $this->scanDirectory($path, $relativePath)
                ];
            } elseif (preg_match('/\.(md|php|html)$/', $item)) {
                $title = ucfirst(pathinfo($item, PATHINFO_FILENAME));
                $result[] = [
                    'type' => 'file',
                    'title' => $title,
                    'path' => $relativePath,
                    'url' => '?page=' . $relativePath
                ];
            }
        }
        
        return $result;
    }
    
    private function performSearch($query) {
        $this->searchResults = [];
        $this->searchInDirectory($this->config['content_dir'], '', $query);
    }
    
    private function searchInDirectory($dir, $prefix, $query) {
        if (!is_dir($dir)) return;
        
        $items = scandir($dir);
        
        foreach ($items as $item) {
            if ($item[0] === '.') continue;
            
            $path = $dir . '/' . $item;
            $relativePath = $prefix ? $prefix . '/' . $item : $item;
            
            if (is_dir($path)) {
                $this->searchInDirectory($path, $relativePath, $query);
} elseif (preg_match('/\.(md|php|html)$/', $item)) {
                $content = file_get_contents($path);
                if (stripos($content, $query) !== false || stripos($item, $query) !== false) {
                    $title = ucfirst(pathinfo($item, PATHINFO_FILENAME));
                    $this->searchResults[] = [
                        'title' => $title,
                        'path' => $relativePath,
                        'url' => '?page=' . $relativePath,
                        'snippet' => $this->createSnippet($content, $query)
                    ];
                }
            }
        }
    }
    
    private function createSnippet($content, $query) {
        $content = strip_tags($content);
        $pos = stripos($content, $query);
        if ($pos === false) return substr($content, 0, 100) . '...';
        
        $start = max(0, $pos - 50);
        $snippet = substr($content, $start, 150);
        return '...' . $snippet . '...';
    }
    
    public function getPage() {
        if (isset($_GET['search'])) {
            return $this->getSearchResults();
        }
        
        $page = $_GET['page'] ?? $this->config['default_page'];
        $page = preg_replace('/\.[^.]+$/', '', $page);
        
        $filePath = $this->config['content_dir'] . '/' . $page;
        $actualFilePath = null;
        
        if (file_exists($filePath . '.md')) {
            $actualFilePath = $filePath . '.md';
            $result = $this->parseMarkdown(file_get_contents($actualFilePath));
        } elseif (file_exists($filePath . '.php')) {
            $actualFilePath = $filePath . '.php';
            $result = $this->parsePHP($actualFilePath);
        } elseif (file_exists($filePath . '.html')) {
            $actualFilePath = $filePath . '.html';
            $result = $this->parseHTML(file_get_contents($actualFilePath));
        } elseif (file_exists($filePath)) {
            $actualFilePath = $filePath;
            $extension = pathinfo($filePath, PATHINFO_EXTENSION);
            if ($extension === 'md') {
                $result = $this->parseMarkdown(file_get_contents($actualFilePath));
            } elseif ($extension === 'php') {
                $result = $this->parsePHP($actualFilePath);
            } elseif ($extension === 'html') {
                $result = $this->parseHTML(file_get_contents($actualFilePath));
            }
        }
        
        if (isset($result) && $actualFilePath) {
            $result['file_info'] = $this->getFileInfo($actualFilePath);
            return $result;
        }
        
        return $this->getError404();
    }
    
    private function getFileInfo($filePath) {
        if (!file_exists($filePath)) {
            return null;
        }
        
        $stats = stat($filePath);
        $created = date('d-m-Y H:i', $stats['ctime']);
        $modified = date('d-m-Y H:i', $stats['mtime']);
        
        return [
            'created' => $created,
            'modified' => $modified,
            'size' => $this->formatFileSize($stats['size'])
        ];
    }
    
    private function formatFileSize($bytes) {
        $units = ['B', 'KB', 'MB', 'GB'];
        $bytes = max($bytes, 0);
        $pow = floor(($bytes ? log($bytes) : 0) / log(1024));
        $pow = min($pow, count($units) - 1);
        
        $bytes /= pow(1024, $pow);
        
        return round($bytes, 2) . ' ' . $units[$pow];
    }
    
    private function getSearchResults() {
        $query = $_GET['search'];
        $content = '<h2>Search Results for: "' . htmlspecialchars($query) . '"</h2>';
        
        if (empty($this->searchResults)) {
            $content .= '<p>No results found.</p>';
        } else {
            $content .= '<p>Found ' . count($this->searchResults) . ' results:</p>';
            foreach ($this->searchResults as $result) {
                $content .= '<div class="card mb-3">';
                $content .= '<div class="card-body">';
                $content .= '<h5 class="card-title"><a href="' . htmlspecialchars($result['url']) . '">' . htmlspecialchars($result['title']) . '</a></h5>';
                $content .= '<p class="card-text text-muted">' . htmlspecialchars($result['path']) . '</p>';
                $content .= '<p class="card-text">' . htmlspecialchars($result['snippet']) . '</p>';
                $content .= '</div></div>';
            }
        }
        
        return [
            'title' => 'Search Results',
            'content' => $content
        ];
    }
    
    private function parseMarkdown($content) {
        $lines = explode("\n", $content);
        $title = '';
        $body = '';
        $inBody = false;
        
        foreach ($lines as $line) {
            if (!$inBody && preg_match('/^#\s+(.+)$/', $line, $matches)) {
                $title = $matches[1];
                $inBody = true;
            } elseif ($inBody || trim($line) !== '') {
                $body .= $line . "\n";
                $inBody = true;
            }
        }
        
        $body = preg_replace('/### (.+)/', '<h3>$1</h3>', $body);
        $body = preg_replace('/## (.+)/', '<h2>$1</h2>', $body);
        $body = preg_replace('/# (.+)/', '<h1>$1</h1>', $body);
        $body = preg_replace('/\*\*(.+?)\*\*/', '<strong>$1</strong>', $body);
        $body = preg_replace('/\*(.+?)\*/', '<em>$1</em>', $body);
        
        // Convert Markdown links to HTML links
        $body = preg_replace('/\[([^\]]+)\]\(([^)]+)\)/', '<a href="$2">$1</a>', $body);
        
        // Convert relative internal links to CMS format
        $body = preg_replace('/href="\/blog\/([^"]+)"/', 'href="?page=blog/$1"', $body);
        $body = preg_replace('/href="\/([^"]+)"/', 'href="?page=$1"', $body);
        
        // Auto-link page titles to existing content pages
        $body = $this->autoLinkPageTitles($body);
        
        $body = preg_replace('/\n\n/', '</p><p>', $body);
        $body = '<p>' . $body . '</p>';
        $body = preg_replace('/<p><\/p>/', '', $body);
        $body = preg_replace('/<p>(<h[1-6]>)/', '$1', $body);
        $body = preg_replace('/(<\/h[1-6]>)<\/p>/', '$1', $body);
        
        return [
            'title' => $title ?: 'Untitled',
            'content' => $body
        ];
    }
    
    private function autoLinkPageTitles($content) {
        // Get all available pages with their titles
        $pages = $this->getAllPageTitles();
        
        foreach ($pages as $pagePath => $pageTitle) {
            // Create a pattern that matches the exact page title (case-insensitive)
            $pattern = '/\b' . preg_quote($pageTitle, '/') . '\b/i';
            
            // Replace with link, but avoid linking inside existing links or headings
            $replacement = function($matches) use ($pageTitle, $pagePath) {
                // Check if we're inside an HTML tag or link
                $before = substr($matches[0], 0, 50);
                if (preg_match('/<[^>]*$/', $before) || preg_match('/href=/', $before)) {
                    return $matches[0]; // Don't link inside HTML tags
                }
                
                return '<a href="?page=' . $pagePath . '" class="auto-link" title="Ga naar ' . htmlspecialchars($pageTitle) . '">' . $matches[0] . '</a>';
            };
            
            $content = preg_replace_callback($pattern, $replacement, $content);
        }
        
        return $content;
    }
    
    private function getAllPageTitles() {
        $pages = [];
        $this->scanForPageTitles($this->config['content_dir'], '', $pages);
        return $pages;
    }
    
    private function scanForPageTitles($dir, $prefix, &$pages) {
        if (!is_dir($dir)) return;
        
        $items = scandir($dir);
        sort($items);
        
        foreach ($items as $item) {
            if ($item[0] === '.') continue;
            
            $path = $dir . '/' . $item;
            $relativePath = $prefix ? $prefix . '/' . $item : $item;
            
            if (is_dir($path)) {
                $this->scanForPageTitles($path, $relativePath, $pages);
            } elseif (preg_match('/\.(md|php|html)$/', $item)) {
                $title = $this->extractPageTitle($path);
                if ($title && !empty(trim($title))) {
                    $pagePath = preg_replace('/\.[^.]+$/', '', $relativePath);
                    $pages[$pagePath] = $title;
                }
            }
        }
    }
    
    private function extractPageTitle($filePath) {
        $content = file_get_contents($filePath);
        $extension = pathinfo($filePath, PATHINFO_EXTENSION);
        
        if ($extension === 'md') {
            // Extract first H1 from Markdown
            if (preg_match('/^#\s+(.+)$/m', $content, $matches)) {
                return trim($matches[1]);
            }
        } elseif ($extension === 'php') {
            // Extract title from PHP file
            if (preg_match('/\$title\s*=\s*["\']([^"\']+)["\']/', $content, $matches)) {
                return trim($matches[1]);
            }
        } elseif ($extension === 'html') {
            // Extract title from HTML file
            if (preg_match('/<title>(.*?)<\/title>/i', $content, $matches)) {
                return trim(strip_tags($matches[1]));
            }
            if (preg_match('/<h1[^>]*>(.*?)<\/h1>/i', $content, $matches)) {
                return trim(strip_tags($matches[1]));
            }
        }
        
        return null;
    }
    
    private function parsePHP($filePath) {
        ob_start();
        $title = 'Untitled';
        include $filePath;
        $content = ob_get_clean();
        
        return [
            'title' => $title,
            'content' => $content
        ];
    }
    
    private function parseHTML($content) {
        $title = 'Untitled';
        
        if (preg_match('/<title>(.*?)<\/title>/i', $content, $matches)) {
            $title = strip_tags($matches[1]);
        } elseif (preg_match('/<h1[^>]*>(.*?)<\/h1>/i', $content, $matches)) {
            $title = strip_tags($matches[1]);
        }
        
        return [
            'title' => $title,
            'content' => $content
        ];
    }
    
    private function getError404() {
        return [
            'title' => 'Page Not Found',
            'content' => '<h1>404 - Page Not Found</h1><p>The page you are looking for does not exist.</p>'
        ];
    }
    
    public function getMenu() {
        return $this->menu;
    }
    
    public function render() {
        $page = $this->getPage();
        $menu = $this->getMenu();
        $breadcrumb = $this->getBreadcrumb();
        
        $template = file_get_contents($this->config['templates_dir'] . '/layout.html');
        
        $template = str_replace('{{site_title}}', $this->config['site_title'], $template);
        $template = str_replace('{{page_title}}', $page['title'], $template);
        $template = str_replace('{{content}}', $page['content'], $template);
        $template = str_replace('{{search_query}}', isset($_GET['search']) ? htmlspecialchars($_GET['search']) : '', $template);
        $template = str_replace('{{breadcrumb}}', $breadcrumb, $template);
        
        // File info for footer
        $fileInfo = '';
        if (isset($page['file_info'])) {
            $fileInfo = '<i class="bi bi-file-text"></i> Created: ' . htmlspecialchars($page['file_info']['created']) . 
                       ' | Modified: ' . htmlspecialchars($page['file_info']['modified']);
        }
        $template = str_replace('{{file_info}}', $fileInfo, $template);
        
        $menuHtml = $this->renderMenu($menu);
        
        $template = str_replace('{{menu}}', $menuHtml, $template);
        
        echo $template;
    }
    
    private function getBreadcrumb() {
        if (isset($_GET['search'])) {
            return '<nav aria-label="breadcrumb"><ol class="breadcrumb"><li class="breadcrumb-item"><a href="?page=' . $this->config['default_page'] . '">Home</a></li><li class="breadcrumb-item active">Search</li></ol></nav>';
        }
        
        $page = $_GET['page'] ?? $this->config['default_page'];
        $page = preg_replace('/\.[^.]+$/', '', $page);
        
        if ($page === $this->config['default_page']) {
            return '<nav aria-label="breadcrumb"><ol class="breadcrumb"><li class="breadcrumb-item active">Home</li></ol></nav>';
        }
        
        $parts = explode('/', $page);
        $breadcrumb = '<nav aria-label="breadcrumb"><ol class="breadcrumb"><li class="breadcrumb-item"><a href="?page=' . $this->config['default_page'] . '">Home</a></li>';
        
        $path = '';
        foreach ($parts as $i => $part) {
            $path .= ($path ? '/' : '') . $part;
            $title = ucfirst($part);
            
            if ($i === count($parts) - 1) {
                $breadcrumb .= '<li class="breadcrumb-item active">' . $title . '</li>';
            } else {
                $breadcrumb .= '<li class="breadcrumb-item"><a href="?page=' . $path . '">' . $title . '</a></li>';
            }
        }
        
        $breadcrumb .= '</ol></nav>';
        return $breadcrumb;
    }
    
    private function renderMenu($items, $level = 0) {
        $html = '';
        foreach ($items as $item) {
            if ($item['type'] === 'folder') {
                $hasChildren = !empty($item['children']);
                $html .= '<li class="nav-item">';
                
                if ($hasChildren) {
                    $folderId = 'folder-' . str_replace('/', '-', $item['path']);
                    $html .= '<span class="nav-link folder-toggle" data-bs-toggle="collapse" data-bs-target="#' . $folderId . '" aria-expanded="false">';
                    $html .= '<i class="arrow bi bi-chevron-right"></i> ' . htmlspecialchars($item['title']);
                    $html .= '</span>';
                    $html .= '<ul class="nav flex-column ms-2 collapse" id="' . $folderId . '">';
                    $html .= $this->renderMenu($item['children'], $level + 1);
                    $html .= '</ul>';
                } else {
                    $html .= '<span class="nav-link folder-disabled" disabled>';
                    $html .= '<i class="arrow bi bi-chevron-right"></i> ' . htmlspecialchars($item['title']);
                    $html .= '</span>';
                }
                
                $html .= '</li>';
            } else {
                $active = (isset($_GET['page']) && $_GET['page'] === $item['path']) ? 'active' : '';
                $html .= '<li class="nav-item">';
                $html .= '<a class="nav-link page-link ' . $active . '" href="' . htmlspecialchars($item['url']) . '">' . htmlspecialchars($item['title']) . '</a>';
                $html .= '</li>';
            }
        }
        return $html;
    }
}

$cms = new CodePressCMS($config);
$cms->render();