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<?php
error_reporting(E_ALL);
ini_set('display_errors', 0);
ini_set('log_errors', 1);
ini_set('error_log', '/path/to/error.log');

require_once 'bot.php';

// Конфигурация
define('BOT_TOKEN', '7572198293:AAFva1HURwEc4LNkT5Zzbziqi1B1qL-2Lq0');
define('WEBHOOK_SECRET', '637737jsjjsjjj'); // Опциональный секрет для безопасности

class WebhookHandler {
    private $bot;
    private $database;
    
    public function __construct() {
        global $database;
        $this->database = $database;
        $this->bot = new TelegramBot(BOT_TOKEN);
    }
    
    public function handle() {
        try {
            // Проверяем метод запроса
            if ($_SERVER['REQUEST_METHOD'] !== 'POST') {
                $this->sendError('Only POST method allowed', 405);
                return;
            }
            
            // Проверяем Content-Type
            $contentType = $_SERVER['CONTENT_TYPE'] ?? '';
            if (strpos($contentType, 'application/json') === false) {
                $this->sendError('Content-Type must be application/json', 400);
                return;
            }
            
            // Получаем данные
            $input = file_get_contents('php://input');
            if (empty($input)) {
                $this->sendError('Empty request body', 400);
                return;
            }
            
            // Проверяем секрет (если настроен)
            if (defined('WEBHOOK_SECRET') && !empty(WEBHOOK_SECRET)) {
                $signature = $_SERVER['HTTP_X_TELEGRAM_BOT_API_SECRET_TOKEN'] ?? '';
                if ($signature !== WEBHOOK_SECRET) {
                    $this->database->log('warning', 'Invalid webhook secret', [
                        'ip' => $_SERVER['REMOTE_ADDR'] ?? 'unknown',
                        'signature' => $signature
                    ]);
                    $this->sendError('Forbidden', 403);
                    return;
                }
            }
            
            // Декодируем JSON
            $update = json_decode($input, true);
            if (json_last_error() !== JSON_ERROR_NONE) {
                $this->sendError('Invalid JSON: ' . json_last_error_msg(), 400);
                return;
            }
            
            // Логируем входящее обновление
            $this->database->log('debug', 'Webhook received', [
                'update_id' => $update['update_id'] ?? 'unknown',
                'type' => $this->getUpdateType($update)
            ]);
            
            // Обрабатываем обновление
            $this->bot->processUpdate($update);
            
            // Отправляем успешный ответ
            http_response_code(200);
            echo json_encode(['ok' => true]);
            
        } catch (Exception $e) {
            $this->database->log('error', 'Webhook error: ' . $e->getMessage(), [
                'file' => $e->getFile(),
                'line' => $e->getLine(),
                'trace' => $e->getTraceAsString()
            ]);
            
            $this->sendError('Internal server error', 500);
        }
    }
    
    private function getUpdateType($update) {
        if (isset($update['message'])) {
            return 'message';
        } elseif (isset($update['callback_query'])) {
            return 'callback_query';
        } elseif (isset($update['inline_query'])) {
            return 'inline_query';
        } elseif (isset($update['chosen_inline_result'])) {
            return 'chosen_inline_result';
        } elseif (isset($update['edited_message'])) {
            return 'edited_message';
        } elseif (isset($update['channel_post'])) {
            return 'channel_post';
        } elseif (isset($update['edited_channel_post'])) {
            return 'edited_channel_post';
        }
        
        return 'unknown';
    }
    
    private function sendError($message, $code = 400) {
        http_response_code($code);
        echo json_encode(['error' => $message]);
        
        $this->database->log('warning', 'Webhook error response', [
            'message' => $message,
            'code' => $code,
            'ip' => $_SERVER['REMOTE_ADDR'] ?? 'unknown',
            'user_agent' => $_SERVER['HTTP_USER_AGENT'] ?? 'unknown'
        ]);
    }
}

// Обработка webhook-запросов
if ($_SERVER['REQUEST_METHOD'] === 'POST') {
    $handler = new WebhookHandler();
    $handler->handle();
    exit;
}

// GET-запросы для настройки webhook
if ($_SERVER['REQUEST_METHOD'] === 'GET') {
    $action = $_GET['action'] ?? '';
    
    switch ($action) {
        case 'set':
            setWebhook();
            break;
            
        case 'delete':
            deleteWebhook();
            break;
            
        case 'info':
            getWebhookInfo();
            break;
            
        default:
            showHelp();
    }
    exit;
}

function setWebhook() {
    $webhookUrl = getWebhookUrl();
    
    $params = [
        'url' => $webhookUrl,
        'max_connections' => 100,
        'drop_pending_updates' => true,
        'allowed_updates' => ['message', 'callback_query']
    ];
    
    if (defined('WEBHOOK_SECRET') && !empty(WEBHOOK_SECRET)) {
        $params['secret_token'] = WEBHOOK_SECRET;
    }
    
    $response = makeApiRequest('setWebhook', $params);
    
    if ($response && $response['ok']) {
        echo json_encode([
            'success' => true,
            'message' => 'Webhook установлен успешно',
            'url' => $webhookUrl
        ]);
    } else {
        echo json_encode([
            'success' => false,
            'message' => 'Ошибка установки webhook',
            'error' => $response['description'] ?? 'Unknown error'
        ]);
    }
}

function deleteWebhook() {
    $response = makeApiRequest('deleteWebhook', ['drop_pending_updates' => true]);
    
    if ($response && $response['ok']) {
        echo json_encode([
            'success' => true,
            'message' => 'Webhook удален успешно'
        ]);
    } else {
        echo json_encode([
            'success' => false,
            'message' => 'Ошибка удаления webhook',
            'error' => $response['description'] ?? 'Unknown error'
        ]);
    }
}

function getWebhookInfo() {
    $response = makeApiRequest('getWebhookInfo');
    
    if ($response && $response['ok']) {
        echo json_encode([
            'success' => true,
            'info' => $response['result']
        ]);
    } else {
        echo json_encode([
            'success' => false,
            'message' => 'Ошибка получения информации о webhook'
        ]);
    }
}

function showHelp() {
    $baseUrl = getBaseUrl();
    
    echo json_encode([
        'help' => [
            'Установить webhook' => $baseUrl . '?action=set',
            'Удалить webhook' => $baseUrl . '?action=delete',
            'Информация о webhook' => $baseUrl . '?action=info',
            'Webhook URL' => getWebhookUrl()
        ]
    ]);
}

function makeApiRequest($method, $params = []) {
    $url = "https://api.telegram.org/bot" . BOT_TOKEN . "/" . $method;
    
    $ch = curl_init();
    curl_setopt($ch, CURLOPT_URL, $url);
    curl_setopt($ch, CURLOPT_POST, true);
    curl_setopt($ch, CURLOPT_POSTFIELDS, http_build_query($params));
    curl_setopt($ch, CURLOPT_RETURNTRANSFER, true);
    curl_setopt($ch, CURLOPT_TIMEOUT, 30);
    curl_setopt($ch, CURLOPT_USERAGENT, 'BTC Exchange Bot Webhook');
    
    $response = curl_exec($ch);
    $error = curl_error($ch);
    curl_close($ch);
    
    if ($error) {
        global $database;
        $database->log('error', 'Telegram API error: ' . $error, ['method' => $method, 'params' => $params]);
        return false;
    }
    
    return json_decode($response, true);
}

function getBaseUrl() {
    $protocol = isset($_SERVER['HTTPS']) && $_SERVER['HTTPS'] === 'on' ? 'https' : 'http';
    $host = $_SERVER['HTTP_HOST'] ?? 'localhost';
    $uri = $_SERVER['REQUEST_URI'] ?? '';
    $uri = strtok($uri, '?'); // Убираем параметры запроса
    
    return $protocol . '://' . $host . $uri;
}

function getWebhookUrl() {
    return getBaseUrl();
}

// Проверка конфигурации при первом запуске
function checkConfiguration() {
    $errors = [];
    
    if (!defined('BOT_TOKEN') || empty(BOT_TOKEN) || BOT_TOKEN === 'YOUR_BOT_TOKEN_HERE') {
        $errors[] = 'BOT_TOKEN не настроен';
    }
    
    if (!extension_loaded('curl')) {
        $errors[] = 'Расширение cURL не установлено';
    }
    
    if (!extension_loaded('json')) {
        $errors[] = 'Расширение JSON не установлено';
    }
    
    if (!extension_loaded('pdo')) {
        $errors[] = 'Расширение PDO не установлено';
    }
    
    if (!is_writable(dirname(__FILE__))) {
        $errors[] = 'Нет прав на запись в директорию';
    }
    
    return $errors;
}

// Проверяем конфигурацию
$configErrors = checkConfiguration();
if (!empty($configErrors)) {
    http_response_code(500);
    echo json_encode([
        'error' => 'Ошибка конфигурации',
        'details' => $configErrors
    ]);
    exit;
}

// Healthcheck endpoint
if (isset($_GET['health'])) {
    echo json_encode([
        'status' => 'ok',
        'timestamp' => date('Y-m-d H:i:s'),
        'version' => '1.0.0'
    ]);
    exit;
}

?>