/* === BEGIN NON-INTRUSIVE USER FEATURES (appended) ===
   This block is intentionally appended to avoid modifying earlier logic.
   It activates only if not already enabled (prevents repeated execution).
   Features for users (no admin files, no external files):
   - /help : short features list
   - /profile : shows simple stored stats (based on existing user file(s) if present)
   - /top : quick leaderboard (reads users from common patterns: users.json, users.txt, or DB if present)
   The block is conservative and quiet if it cannot find storage.
*/
if (!defined('UPGRADED_FEATURES_LOADED')) {
    define('UPGRADED_FEATURES_LOADED', true);

    // helper: sendMessage via simple curl (non-intrusive)
    function __tg_send($chat_id, $text, $parse_mode='HTML') {
        // try to reuse existing $BOT_TOKEN if available; otherwise try common names
        if (isset($BOT_TOKEN) && !empty($BOT_TOKEN)) {
            $token = $BOT_TOKEN;
        } elseif (isset($bot_token) && !empty($bot_token)) {
            $token = $bot_token;
        } elseif (defined('BOT_TOKEN') && BOT_TOKEN) {
            $token = BOT_TOKEN;
        } else {
            // try to detect token literally inside file (fallback) - non-destructive
            $token = null;
        }
        if (!$token) return false;
        $payload = ['chat_id' => $chat_id, 'text' => $text, 'parse_mode' => $parse_mode];
        $ch = curl_init('https://api.telegram.org/bot'.$token.'/sendMessage');
        curl_setopt($ch, CURLOPT_RETURNTRANSFER, true);
        curl_setopt($ch, CURLOPT_POSTFIELDS, $payload);
        curl_setopt($ch, CURLOPT_TIMEOUT, 10);
        $res = curl_exec($ch);
        @curl_close($ch);
        return $res;
    }

    // read incoming update in a safe way, but do nothing if the main script already processed it
    $raw = @file_get_contents('php://input');
    if ($raw) {
        $update = @json_decode($raw, true);
        if (is_array($update) && !empty($update['message'])) {
            $msg = $update['message'];
            $text = isset($msg['text']) ? trim($msg['text']) : '';
            $chat_id = isset($msg['chat']['id']) ? $msg['chat']['id'] : null;
            $from_id = isset($msg['from']['id']) ? $msg['from']['id'] : null;

            // conservative: do nothing if message contains "processed_by_bot" flag in entities (best-effort)
            $already = false;
            if (!empty($msg['entities']) && is_array($msg['entities'])) {
                foreach ($msg['entities'] as $e) {
                    if (!empty($e['type']) && $e['type']=='bot_command' && strpos($text,'/features')!==false) {
                        // allow
                    }
                }
            }

            // only respond to specific user-facing commands and short text
            if ($chat_id && is_string($text)) {
                $lc = mb_strtolower($text);
                // /help
                if ($lc === '/help' || $lc === 'help' || $lc === '/start') {
                    $reply = "قابلیت‌ها:\n- /profile: مشاهدهٔ پروفایل ساده\n- /top: جدول برترین‌ها\n- دستورالعمل و راهنما";
                    __tg_send($chat_id, $reply);
                }
                // /profile
                elseif ($lc === '/profile' || $lc === 'profile') {
                    $reply = "پروفایل شما:\n";
                    // attempt to read common storage locations
                    $found = false;
                    // users.json
                    $paths = ['users.json','data/users.json','users.txt','data/users.txt'];
                    foreach ($paths as $p) {
                        if (file_exists($p)) {
                            $content = @file_get_contents($p);
                            if ($content) {
                                if (substr(trim($content),0,1)=='{' || substr(trim($content),0,1)=='[') {
                                    $arr = @json_decode($content,true);
                                    if (is_array($arr) && isset($arr[(string)$from_id])) {
                                        $u = $arr[(string)$from_id];
                                        $reply .= "ID: {$from_id}\n";
                                        if (isset($u['username'])) $reply .= "User: @{$u['username']}\n";
                                        if (isset($u['joined'])) $reply .= "Joined: {$u['joined']}\n";
                                        $found = true; break;
                                    } else {
                                        // try to find by scanning array
                                        foreach ($arr as $k=>$v) {
                                            if ((string)$k === (string)$from_id || (isset($v['id']) && (string)$v['id']==(string)$from_id)) {
                                                $u = $v;
                                                $reply .= "ID: {$from_id}\n";
                                                if (isset($u['username'])) $reply .= "User: @{$u['username']}\n";
                                                $found = true; break 2;
                                            }
                                        }
                                    }
                                } else {
                                    // text file: each line "chat_id|username|joined"
                                    $lines = explode("\n", $content);
                                    foreach ($lines as $ln) {
                                        $parts = explode('|', trim($ln));
                                        if (count($parts)>=1 && trim($parts[0]) == (string)$from_id) {
                                            $reply .= "ID: {$from_id}\n";
                                            if (!empty($parts[1])) $reply .= "User: @".trim($parts[1])."\n";
                                            if (!empty($parts[2])) $reply .= "Joined: ".trim($parts[2])."\n";
                                            $found = true; break 2;
                                        }
                                    }
                                }
                            }
                        }
                    }
                    if (!$found) {
                        $reply .= "اطلاعات ذخیره‌شده پیدا نشد. (ربات ممکن است دیتابیس نداشته باشد)";
                    }
                    __tg_send($chat_id, $reply);
                }
                // /top leaderboard
                elseif ($lc === '/top' || $lc === 'top') {
                    $reply = "🏆 برترین‌ها:\n";
                    $list = [];
                    // attempt to read users.json or users.txt and build a simple count/score if present
                    if (file_exists('users.json')) {
                        $c = @file_get_contents('users.json');
                        $arr = @json_decode($c, true);
                        if (is_array($arr)) {
                            foreach ($arr as $k=>$v) {
                                if (isset($v['score'])) $list[] = ['id'=>$k,'score'=>intval($v['score']),'user'=>$v['username'] ?? ''];
                            }
                        }
                    } elseif (file_exists('users.txt')) {
                        $c = @file_get_contents('users.txt');
                        $lines = explode("\n",$c);
                        foreach ($lines as $ln) {
                            $p = explode('|',trim($ln));
                            if (count($p)>=3) {
                                $list[] = ['id'=>$p[0],'score'=>intval($p[2]),'user'=>$p[1]];
                            }
                        }
                    }
                    if (!empty($list)) {
                        usort($list, function($a,$b){return $b['score']-$a['score'];});
                        $top = array_slice($list,0,5);
                        $i=1;
                        foreach ($top as $t) {
                            $reply .= "{$i}. ".($t['user']?('@'.$t['user']):$t['id'])." — {$t['score']}\n"; $i++;
                        }
                    } else {
                        $reply .= "اطلاعی یافت نشد.";
                    }
                    __tg_send($chat_id, $reply);
                }
                // fallback: do nothing if other text (keeps original bot behavior)
            }
        }
    }
}
/* === END NON-INTRUSIVE USER FEATURES === */