<?php
// ============================================================================
// Modern PHP 8 Textboard System
// Based on world2ch/kareha style textboard
// Production ready - just drop into htdocs and run
// ============================================================================

// Configuration
define('LOGFILE', 'log.txt');           // Name for logfile
define('TITLE', 'Meta/Site');           // Title of your BBS
define('PAGE_DEF', '10');               // Number of threads per page
define('LOG_MAX', '1000');              // Maximum number of posts in log
define('ADMIN_PASS', '4325');           // The admin password
define('RE_COL', '#789922');            // Color of greentext
define('NIKKI', 0);                     // Close board to users? Yes=1 No=0
define('RENZOKU', 30);                  // Continuous posting prevention (seconds)
define('PHP_SELF', basename(__FILE__)); // Script name
define('MARKUP_DEFAULT', 'waka');       // Default markup type
define('MAX_THREADS', 100);             // Maximum number of threads
define('THREAD_EXPIRE', 30);            // Days before threads expire
define('ADMIN_IP', '127.0.0.1');       // Admin IP (set to your IP)

// Error reporting for development (disable in production)
error_reporting(E_ALL);
ini_set('display_errors', 1);

// Security headers
header('X-Content-Type-Options: nosniff');
header('X-Frame-Options: DENY');
header('X-XSS-Protection: 1; mode=block');

session_start();

class TextBoard {
    private $logfile;
    private $threads = [];
    private $posts = [];
    
    public function __construct() {
        $this->logfile = LOGFILE;
        $this->loadData();
        $this->handleRequest();
    }
    
    private function loadData() {
        if (!file_exists($this->logfile)) {
            file_put_contents($this->logfile, '');
            return;
        }
        
        $lines = file($this->logfile, FILE_IGNORE_NEW_LINES | FILE_SKIP_EMPTY_LINES);
        foreach ($lines as $line) {
            $data = explode("\t", $line);
            if (count($data) >= 10) {
                $post = [
                    'id' => $data[0],
                    'thread' => $data[1], 
                    'datetime' => $data[2],
                    'name' => $data[3],
                    'email' => $data[4],
                    'title' => $data[5],
                    'body' => $data[6],
                    'ip' => $data[7],
                    'delkey' => $data[8],
                    'markup' => $data[9] ?? 'waka'
                ];
                
                if ($post['thread'] == '0') {
                    $this->threads[$post['id']] = $post;
                }
                $this->posts[] = $post;
            }
        }
    }
    
    private function saveData() {
        $data = '';
        foreach ($this->posts as $post) {
            $data .= implode("\t", [
                $post['id'],
                $post['thread'],
                $post['datetime'],
                $post['name'],
                $post['email'],
                $post['title'],
                $post['body'],
                $post['ip'],
                $post['delkey'],
                $post['markup']
            ]) . "\n";
        }
        file_put_contents($this->logfile, $data, LOCK_EX);
    }
    
    private function handleRequest() {
        $task = $_POST['task'] ?? $_GET['task'] ?? 'default';
        
        if (NIKKI && $task == 'post') {
            $this->showError('Board is closed');
            return;
        }
        
        switch ($task) {
            case 'post':
                $this->handlePost();
                break;
            case 'admin':
                $this->handleAdmin();
                break;
            default:
                $this->showBoard();
                break;
        }
    }
    
    private function handlePost() {
        if (!$this->checkRateLimit()) {
            $this->showError('Please wait ' . RENZOKU . ' seconds between posts');
            return;
        }
        
        $thread = $_POST['thread'] ?? '0';
        $name = $this->sanitize($_POST['field_a'] ?? 'Nameless');
        $email = $this->sanitize($_POST['field_b'] ?? '');
        $title = $this->sanitize($_POST['title'] ?? '');
        $comment = $_POST['comment'] ?? '';
        $markup = $_POST['markup'] ?? MARKUP_DEFAULT;
        
        // Spam trap check
        if (!empty($_POST['name']) || !empty($_POST['link'])) {
            $this->showError('Spam detected');
            return;
        }
        
        if (empty($comment) && $thread == '0' && empty($title)) {
            $this->showError('Comment and title cannot both be empty');
            return;
        }
        
        if ($thread == '0' && empty($title)) {
            $this->showError('Thread title is required');
            return;
        }
        
        $ip = $_SERVER['REMOTE_ADDR'];
        $delkey = $this->generateDelKey();
        $id = $this->generateId();
        $datetime = date('Y/m/d H:i');
        
        // Process comment
        $body = $this->processMarkup($comment, $markup);
        
        $post = [
            'id' => $id,
            'thread' => $thread,
            'datetime' => $datetime,
            'name' => $name,
            'email' => $email,
            'title' => $title,
            'body' => $body,
            'ip' => $ip,
            'delkey' => password_hash($delkey, PASSWORD_DEFAULT),
            'markup' => $markup
        ];
        
        $this->posts[] = $post;
        
        if ($thread == '0') {
            $this->threads[$id] = $post;
        }
        
        $this->pruneOldPosts();
        $this->saveData();
        $this->setRateLimit();
        
        // Redirect to prevent double posting
        header('Location: ' . PHP_SELF);
        exit;
    }
    
    private function handleAdmin() {
        $pass = $_POST['admin_pass'] ?? '';
        $action = $_POST['admin_action'] ?? '';
        
        if ($pass !== ADMIN_PASS) {
            $this->showError('Invalid admin password');
            return;
        }
        
        switch ($action) {
            case 'delete':
                $delete_id = $_POST['delete_id'] ?? '';
                $this->deletePost($delete_id);
                break;
            case 'ban':
                $ban_ip = $_POST['ban_ip'] ?? '';
                $this->banIP($ban_ip);
                break;
        }
        
        header('Location: ' . PHP_SELF);
        exit;
    }
    
    private function deletePost($id) {
        $this->posts = array_filter($this->posts, function($post) use ($id) {
            return $post['id'] != $id;
        });
        
        if (isset($this->threads[$id])) {
            unset($this->threads[$id]);
        }
        
        $this->saveData();
    }
    
    private function banIP($ip) {
        $banfile = 'banned_ips.txt';
        file_put_contents($banfile, $ip . "\n", FILE_APPEND | LOCK_EX);
    }
    
    private function checkBanned() {
        $banfile = 'banned_ips.txt';
        if (!file_exists($banfile)) return false;
        
        $banned_ips = file($banfile, FILE_IGNORE_NEW_LINES | FILE_SKIP_EMPTY_LINES);
        return in_array($_SERVER['REMOTE_ADDR'], $banned_ips);
    }
    
    private function checkRateLimit() {
        $ip = $_SERVER['REMOTE_ADDR'];
        $last_post = $_SESSION['last_post_' . $ip] ?? 0;
        return (time() - $last_post) >= RENZOKU;
    }
    
    private function setRateLimit() {
        $ip = $_SERVER['REMOTE_ADDR'];
        $_SESSION['last_post_' . $ip] = time();
    }
    
    private function generateId() {
        return time() . rand(100, 999);
    }
    
    private function generateDelKey() {
        return substr(md5(uniqid(rand(), true)), 0, 8);
    }
    
    private function sanitize($str) {
        return htmlspecialchars(trim($str), ENT_QUOTES, 'UTF-8');
    }
    
    private function processMarkup($text, $markup) {
        $text = $this->sanitize($text);
        
        switch ($markup) {
            case 'waka':
                return $this->processWakabaMarkup($text);
            case 'html':
                return $this->processHTMLMarkup($text);
            case 'aa':
                return $this->processAAMarkup($text);
            default:
                return $this->processNoneMarkup($text);
        }
    }
    
    private function processWakabaMarkup($text) {
        // Convert line breaks
        $text = nl2br($text);
        
        // Bold **text**
        $text = preg_replace('/\*\*(.*?)\*\*/', '<strong>$1</strong>', $text);
        
        // Italic *text*
        $text = preg_replace('/\*(.*?)\*/', '<em>$1</em>', $text);
        
        // Greentext
        $text = preg_replace('/^(&gt;.*)$/m', '<span style="color:' . RE_COL . '">$1</span>', $text);
        
        // Auto-link URLs
        $text = preg_replace('/https?:\/\/[^\s<>"]+/', '<a href="$0" rel="nofollow">$0</a>', $text);
        
        // Quote links >>123
        $text = preg_replace('/&gt;&gt;(\d+)/', '<a href="javascript:insert(\'&gt;&gt;$1\',0)">&gt;&gt;$1</a>', $text);
        
        return $text;
    }
    
    private function processHTMLMarkup($text) {
        // Allow limited HTML tags
        $allowed_tags = '<a><b><blockquote><br><dd><dl><dt><em><i><li><ol><p><strong><sub><sup><u><ul>';
        return strip_tags($text, $allowed_tags);
    }
    
    private function processAAMarkup($text) {
        $text = htmlspecialchars($text, ENT_QUOTES, 'UTF-8');
        return '<pre style="font-family:monospace">' . $text . '</pre>';
    }
    
    private function processNoneMarkup($text) {
        $text = nl2br($text);
        // Auto-link URLs only
        $text = preg_replace('/https?:\/\/[^\s<>"]+/', '<a href="$0" rel="nofollow">$0</a>', $text);
        // Quote links
        $text = preg_replace('/&gt;&gt;(\d+)/', '<a href="javascript:insert(\'&gt;&gt;$1\',0)">&gt;&gt;$1</a>', $text);
        return $text;
    }
    
    private function pruneOldPosts() {
        if (count($this->posts) > LOG_MAX) {
            $this->posts = array_slice($this->posts, -LOG_MAX);
        }
        
        // Remove old threads
        if (count($this->threads) > MAX_THREADS) {
            $sorted_threads = $this->threads;
            uasort($sorted_threads, function($a, $b) {
                return strtotime($a['datetime']) - strtotime($b['datetime']);
            });
            
            $to_remove = array_slice(array_keys($sorted_threads), 0, count($sorted_threads) - MAX_THREADS);
            foreach ($to_remove as $thread_id) {
                unset($this->threads[$thread_id]);
                $this->posts = array_filter($this->posts, function($post) use ($thread_id) {
                    return $post['thread'] != $thread_id && $post['id'] != $thread_id;
                });
            }
        }
    }
    
    private function getThreadPosts($thread_id) {
        return array_filter($this->posts, function($post) use ($thread_id) {
            return $post['thread'] == $thread_id || $post['id'] == $thread_id;
        });
    }
    
    private function getThreadReplies($thread_id) {
        return array_filter($this->posts, function($post) use ($thread_id) {
            return $post['thread'] == $thread_id;
        });
    }
    
    private function getLastBumpTime($thread_id) {
        $posts = $this->getThreadPosts($thread_id);
        $latest = 0;
        foreach ($posts as $post) {
            $time = strtotime($post['datetime']);
            if ($time > $latest) {
                $latest = $time;
            }
        }
        return $latest;
    }
    
    private function getThreadsByBumpOrder() {
        $threads_with_bump = [];
        foreach ($this->threads as $thread_id => $thread) {
            $threads_with_bump[$thread_id] = [
                'thread' => $thread,
                'bump_time' => $this->getLastBumpTime($thread_id)
            ];
        }
        
        // Sort by bump time (newest first)
        uasort($threads_with_bump, function($a, $b) {
            return $b['bump_time'] - $a['bump_time'];
        });
        
        return $threads_with_bump;
    }
    
    private function showError($message) {
        $this->showHeader();
        echo '<div class="error">' . $this->sanitize($message) . '</div>';
        $this->showFooter();
    }
    
    private function showBoard() {
        if ($this->checkBanned()) {
            $this->showError('You have been banned');
            return;
        }
        
        $this->showHeader();
        $this->showThreadList();
        $this->showThreads();
        $this->showNewThreadForm();
        $this->showFooter();
    }
    
    private function showHeader() {
        ?>
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml" xml:lang="en">
<head>
    <title><?= TITLE ?></title>
    <meta http-equiv="Content-Type" content="text/html;charset=utf-8" />
    <style type="text/css">
        html{padding:0;margin:0;font-family:"MS PGothic"}body{padding:8px;margin:0}body.mainpage{background-color:#C5AD99;background-image:url("../img/ba.gif");color:#000000}body.threadpage{background:#EFEFEF;color:#000000}body.backlogpage{background:#FFFFFF;color:#000000}a{color:#0000FF}a:visited{color:#660099}a:hover{color:#FF0000}form{margin:0}ol ol,ol ul,ul ol,ul ul{margin-top:0;margin-bottom:0}ol p:first-child,ul p:first-child{margin-top:0}ol p:last-child,ul p:last-child{margin-bottom:0}.aa{font-family:Mona,'MS PGothic' !important}.outerbox{background:#CCFFCC;border:1px outset white;padding:7px;margin-bottom:1em;margin-left:2.5%;margin-right:2.5%;clear:both}.innerbox{border:1px inset white;padding:6px}#titlebox h1{font-size:1.5em;font-weight:normal;padding:0;margin:0}#titlebox{position:relative}#titlebox .threadnavigation{position:absolute;right:2.5%;padding-right:20px;top:12px}#titlebox div > .threadnavigation{right:12px;padding-right:0}#threadbox .threadlink{padding-right:0.5em}#threadlinks{text-align:right;font-weight:bold}#createbox h2{font-size:1.2em;font-weight:bold;margin:0 0 0.5em 0.3em}.threadcaptcha{color:#000000}body.threadpage #threads{margin-left:2.5%;margin-right:2.5%;background:#CCFFCC;padding:7px;margin-bottom:2em;border:1px outset white;clear:both}body.mainpage #threads{margin-left:2.5%;margin-right:2.5%;background:#CCFFCC;padding:7px;margin-bottom:2em;border:1px outset white;clear:both}body.backlogpage #threads{background:#FFFFFF}body.threadpage #threads h1{margin-left:2.5%;margin-right:2.5%;font-size:2em;font-weight:normal;text-align:center;padding:0;margin:0;border-top:1px inset white;border-left:1px inset white;border-right:1px inset white}body.backlogpage #threads h1{display:none}body.threadpage #threadlist{background:#CCFFCC;font-family:serif;margin:0 0 7px;padding:6px;border-left:1px inset white;border-right:1px inset white;border-bottom:1px inset white}body.backlogpage #threadlist{background:#FFFFFF;font-family:serif;padding:6px}#oldthreadlist{background:#FFFFFF;font-family:serif;margin:1px;padding:3px;margin-bottom:7px}#oldthreadlist .threadlink{display:block}#oldthreadlist .manage{font-size:small;margin-left:1em}#posts{}.mainpage #posts .thread{margin-left:2.5%;margin-right:2.5%;position:relative;background:#EFEFEF;border:1px outset white;padding:7px;margin-bottom:2em;clear:both}.mainpage #posts .sagethread{margin-left:2.5%;margin-right:2.5%;position:relative;background:#EFEFEF;border:2px inset white;padding:9px;margin-bottom:2em;clear:both}.mainpage #posts h2{color:#FF0000;font-size:1.5em;font-weight:bold;margin:0 0 -1px;padding:1em 0 0 0.3em;border-top:1px inset white;border-left:1px inset white;border-right:1px inset white}.mainpage #posts h2 a{color:#FF0000;text-decoration:none}.mainpage #posts h2 a:hover{text-decoration:underline}.threadpage #posts h2{color:red;font-size:1.2em;font-weight:normal;border-top:2px ridge white;margin:1em 0 0;padding:0 0 0.5em}#posts h2 small{font-size:1em;font-weight:normal}#posts .threadnavigation{position:absolute;right:2.5%;padding-right:20px;top:10px}#posts div > .threadnavigation{right:12px;padding-right:0}#posts .replies{clear:both;margin:0}.mainpage #posts .replies{padding:3px;border-left:1px inset white;border-right:1px inset white}#posts .allreplies,#posts .finalreplies,#posts .firstreply{}#posts .reply{clear:both;margin:0 0 0.5em}#posts .deletedreply{clear:both;margin:0 0 1.2em}#posts h3{font-size:1em;font-weight:normal;margin:0;padding:0}#posts .deletedreply h3{color:#AFAFAF;font-weight:bold}#posts h3 .replynum{font-weight:bold;margin-right:0.3em}.mainpage #posts h3 .replynum{margin-left:0.3em}#posts h3 .replynum a{color:#000000;text-decoration:none}#posts h3 .replynum a:hover{color:#DD0000}#posts h3 .postername{color:green;font-weight:bold}#posts h3 .postertrip{color:green}#posts .deletebutton{font-size:small;position:absolute;right:2.5%;padding-right:8px}#posts h3 > .deletebutton{right:8px;padding-right:0}#posts a img,#posts img.thumb{border-width:1px;float:left;margin:0.5em 2em 0.5em 3em}#posts .nothumbnail{float:left;display:inline;border:1px inset white;text-align:center;padding:1em 0.5em;margin:0.5em 2em}.replytext{margin:0.5em 0 0 3em}.reply .replytext > :first-child{margin-top:0}.replytext blockquote{margin-left:0;font-style:italic}.replytext em{font-style:normal}#posts .replyabbrev{color:green;margin-left:3em;margin-bottom:0.5em}#posts form{clear:both;background:#EFEFEF;font-family:serif;margin:0}#posts form small a{color:#000000;text-decoration:none}#posts form small a:hover{color:#FF0000;text-decoration:underline}.threadpage #posts form{padding-top:0.5em;border-top:2px ridge white}.mainpage #posts form{padding:6px 6px 1em;border-left:1px inset white;border-right:1px inset white;border-bottom:1px inset white}#createbox form .replytext,#posts form .replytext{border:1px dotted #000000;margin:0.5em 0;padding:0 1em;background:#EFEFEF}.postcaptcha{color:#000000}h4{color:red;font-size:1em;font-weight:bold;font-family:sans-serif}#oldthreadlist{}#oldthreadlist th{text-align:left}#oldthreadlist .line0{}#oldthreadlist .line1{}#oldthreadlist a{display:block}#footer{}.errorpage h1,.errorpage h2{text-align:center}
    </style>
    <script type="text/javascript">
        function insert(text, thread) {
            var form = document.getElementById('postform' + thread);
            if (form) {
                var comment = form.querySelector('textarea[name="comment"]');
                if (comment) {
                    comment.value += text + '\n';
                }
            }
        }
        
        function show(id) {
            var element = document.getElementById(id);
            if (element) {
                element.style.display = element.style.display === 'none' ? '' : 'none';
            }
        }
        
        function select_markup(select) {
            // Handle markup selection
        }
        
        function size_field(formid, size) {
            var form = document.getElementById(formid);
            if (form) {
                var textarea = form.querySelector('textarea');
                if (textarea) {
                    textarea.rows = size;
                }
            }
        }
    </script>
</head>
<body class="mainpage">
<center><h1><?= TITLE ?></h1></center>
        <?php
    }
    
    private function showThreadList() {
        echo '<a name="menu"></a>';
        echo '<div id="threadbox" class="outerbox"><div class="innerbox">';
        echo '<div id="threadlist">';
        
        // Get threads sorted by bump order
        $threads_by_bump = $this->getThreadsByBumpOrder();
        $bump_order = 1;
        
        foreach ($threads_by_bump as $thread_id => $thread_data) {
            $thread = $thread_data['thread'];
            $reply_count = count($this->getThreadReplies($thread_id));
            
            echo '<span class="threadlink">';
            echo '<a href="' . PHP_SELF . '?thread=' . $thread_id . '" rel="nofollow">' . $bump_order . ':  </a>';
            echo '<a href="#' . $thread_id . '"> ' . ($thread['title'] ?: 'No Title') . ' (' . ($reply_count + 1) . ')</a>';
            echo '</span>';
            $bump_order++;
        }
        
        echo '</div>';
        echo '<div id="threadlinks">';
        echo '<a href="#newthread">New thread</a>';
        echo '</div>';
        echo '</div></div>';
    }
    
    private function showThreads() {
        echo '<div id="posts">';
        
        // Get threads sorted by bump order for display
        $threads_by_bump = $this->getThreadsByBumpOrder();
        $shown_threads = array_slice($threads_by_bump, 0, PAGE_DEF, true);
        
        $bump_order = 1;
        foreach ($shown_threads as $thread_id => $thread_data) {
            $thread = $thread_data['thread'];
            $posts = $this->getThreadPosts($thread_id);
            $reply_count = count($this->getThreadReplies($thread_id));
            
            $sorted_posts = [];
            foreach ($posts as $post) {
                $sorted_posts[] = $post;
            }
            usort($sorted_posts, function($a, $b) {
                return strtotime($a['datetime']) - strtotime($b['datetime']);
            });
            
            echo '<a name="' . $thread_id . '"></a>';
            echo '<div class="thread">';
            echo '<h2><font size="3" color="#000000">【' . $bump_order . ':' . $reply_count . '】 </font>' . $this->sanitize($thread['title']) . '</h2>';
            
            echo '<div class="replies">';
            echo '<div class="allreplies">';
            
            $reply_num = 1;
            foreach ($sorted_posts as $post) {
                $this->showPost($post, $reply_num, $thread_id);
                $reply_num++;
            }
            
            echo '</div></div>';
            
            $this->showReplyForm($thread_id);
            
            echo '</div>';
            $bump_order++;
        }
        
        echo '</div>';
    }
    
    private function showPost($post, $reply_num, $thread_id) {
        echo '<div class="reply">';
        echo '<h3>';
        echo '<span class="replynum"><a title="Quote post number in reply" href="javascript:insert(\'&gt;&gt;' . $reply_num . '\',' . $thread_id . ')">' . $reply_num . '</a></span> ';
        echo 'Name: ';
        
        if (!empty($post['email'])) {
            echo '<span class="postername"><a href="mailto:' . $this->sanitize($post['email']) . '" rel="nofollow">' . $this->sanitize($post['name']) . '</a></span>';
        } else {
            echo '<span class="postername">' . $this->sanitize($post['name']) . '</span>';
        }
        
        echo '<span class="postertrip"></span> : ' . $this->sanitize($post['datetime']);
        
        // Admin controls
        if ($_SERVER['REMOTE_ADDR'] === ADMIN_IP) {
            echo ' <small>[<a href="javascript:void(0)" onclick="if(confirm(\'Delete post?\')) { var f=document.createElement(\'form\'); f.method=\'POST\'; f.action=\'\'; var i=document.createElement(\'input\'); i.type=\'hidden\'; i.name=\'task\'; i.value=\'admin\'; f.appendChild(i); i=document.createElement(\'input\'); i.type=\'hidden\'; i.name=\'admin_action\'; i.value=\'delete\'; f.appendChild(i); i=document.createElement(\'input\'); i.type=\'hidden\'; i.name=\'delete_id\'; i.value=\'' . $post['id'] . '\'; f.appendChild(i); i=document.createElement(\'input\'); i.type=\'hidden\'; i.name=\'admin_pass\'; i.value=\'' . ADMIN_PASS . '\'; f.appendChild(i); document.body.appendChild(f); f.submit(); }">Del</a>]</small>';
        }
        
        echo '</h3>';
        echo '<div class="replytext">' . $post['body'] . '</div>';
        echo '</div>';
    }
    
    private function showReplyForm($thread_id) {
        ?>
        <form id="postform<?= $thread_id ?>" action="<?= PHP_SELF ?>" method="post" enctype="multipart/form-data">
            <input type="hidden" name="task" value="post" />
            <input type="hidden" name="thread" value="<?= $thread_id ?>" />
            <table><tbody>
                <tr>
                    <td>Name: </td>
                    <td>
                        <input type="text" name="field_a" size="19" maxlength="100" />
                        E-Mail: <input type="text" name="field_b" size="19" maxlength="100" />
                        <input type="submit" value="Reply" />
                        <div style="display:none">Leave these fields empty (spam trap): 
                            <input type="text" name="name" size="19" autocomplete="off" />
                            <input type="text" name="link" size="19" autocomplete="off" />
                        </div>
                    </td>
                </tr>
                <tr style="display:none;vertical-align:top" id="options<?= $thread_id ?>">
                    <td></td>
                    <td>
                        <select name="markup" onchange="select_markup(this)">
                            <option value="none">None</option>
                            <option value="waka" selected="selected">WakabaMark</option>
                            <option value="html">HTML</option>
                            <option value="aa">Text Art</option>
                        </select>
                    </td>
                </tr>
                <tr>
                    <td></td>
                    <td><textarea name="comment" cols="64" rows="5" onfocus="size_field('postform<?= $thread_id ?>',15)" onblur="size_field('postform<?= $thread_id ?>',5)"></textarea></td>
                </tr>
            </tbody></table>
        </form>
        <?php
    }
    
    private function showNewThreadForm() {
        ?>
        <a name="newthread"></a>
        <div id="createbox" class="outerbox"><div class="innerbox">
            <h2>New thread</h2>
            <form id="threadform" action="<?= PHP_SELF ?>" method="post" enctype="multipart/form-data">
                <input type="hidden" name="task" value="post" />
                <table><tbody>
                    <tr>
                        <td>Thread Title:</td>
                        <td>
                            <input type="text" name="title" size="46" maxlength="100" />
                            <input type="submit" value="Create new thread" />
                        </td>
                    </tr>
                    <tr>
                        <td>Name: </td>
                        <td>
                            <input type="text" name="field_a" size="19" maxlength="100" />
                            E-Mail: <input type="text" name="field_b" size="19" maxlength="100" />
                            <div style="display:none">Leave these fields empty (spam trap): 
                                <input type="text" name="name" size="19" autocomplete="off" />
                                <input type="text" name="link" size="19" autocomplete="off" />
                            </div>
                        </td>
                    </tr>
                    <tr style="display:none;vertical-align:top" id="options">
                        <td></td>
                        <td>
                            <select name="markup" onchange="select_markup(this)">
                                <option value="none">None</option>
                                <option value="waka" selected="selected">WakabaMark</option>
                                <option value="html">HTML</option>
                                <option value="aa">Text Art</option>
                            </select>
                        </td>
                    </tr>
                    <tr>
                        <td></td>
                        <td><textarea name="comment" cols="64" rows="5" onfocus="size_field('threadform',15)" onblur="size_field('threadform',5)"></textarea></td>
                    </tr>
                </tbody></table>
            </form>
        </div></div>
        
        <?php if ($_SERVER['REMOTE_ADDR'] === ADMIN_IP): ?>
        <div class="adminform">
            <h3>Admin Panel</h3>
            <form method="post">
                <input type="hidden" name="task" value="admin" />
                <input type="password" name="admin_pass" placeholder="Admin Password" required />
                <select name="admin_action">
                    <option value="delete">Delete Post</option>
                    <option value="ban">Ban IP</option>
                </select>
                <input type="text" name="delete_id" placeholder="Post ID" />
                <input type="text" name="ban_ip" placeholder="IP Address" />
                <input type="submit" value="Execute" />
            </form>
        </div>
        <?php endif; ?>
        <?php
    }
    
    private function showFooter() {
        ?>
        <div id="footer">
            <b><a href="https://gitty.neocities.org/#post1">2ch textboard for php 8</a> - <?= date('Y/m/d') ?></b>
        </div>
        </body>
        </html>
        <?php
    }
}

// Initialize the textboard
new TextBoard();
?>