<?php
// callback_ai_response.php
// Endpoint для приема ответов от n8n

header('Content-Type: application/json');
header('Access-Control-Allow-Origin: *');
header('Access-Control-Allow-Methods: POST, OPTIONS');
header('Access-Control-Allow-Headers: Content-Type');

if ($_SERVER['REQUEST_METHOD'] === 'OPTIONS') {
    http_response_code(200);
    exit();
}

error_reporting(E_ALL);
ini_set('display_errors', 1);

try {
    // Подключаемся к БД
    include_once('config.inc.php');
    
    $conn = new mysqli($dbconfig['db_server'], $dbconfig['db_username'], $dbconfig['db_password'], $dbconfig['db_name']);
    
    if ($conn->connect_error) {
        throw new Exception("DB connection failed: " . $conn->connect_error);
    }
    
    $conn->set_charset('utf8mb4');
    
    // Получаем данные от n8n
    $input = json_decode(file_get_contents('php://input'), true);
    
    if (!$input) {
        throw new Exception('Invalid JSON input');
    }
    
    $taskId = $input['taskId'] ?? null;
    $response = $input['response'] ?? null;
    $status = $input['status'] ?? 'completed';
    $error = $input['error'] ?? null;
    
    if (!$taskId) {
        throw new Exception('Missing taskId');
    }
    
    error_log("Callback: Received response for task {$taskId}, status: {$status}");
    
    // Обновляем запись в БД
    if ($status === 'error') {
        $stmt = $conn->prepare("UPDATE ai_responses SET status = 'error', error_message = ?, updated_at = NOW() WHERE task_id = ?");
        $stmt->bind_param('ss', $error, $taskId);
    } else {
        $stmt = $conn->prepare("UPDATE ai_responses SET status = 'completed', response_data = ?, updated_at = NOW() WHERE task_id = ?");
        $stmt->bind_param('ss', $response, $taskId);
    }
    
    if (!$stmt->execute()) {
        throw new Exception("Failed to update task: " . $stmt->error);
    }
    
    $affected = $stmt->affected_rows;
    $stmt->close();
    $conn->close();
    
    error_log("Callback: Updated task {$taskId}, affected rows: {$affected}");
    
    // Публикуем событие в Redis для мгновенной доставки через SSE
    try {
        if (class_exists('Redis')) {
            $redis = new Redis();
            if ($redis->connect('crm.clientright.ru', 6379)) {
                $redis->auth('CRM_Redis_Pass_2025_Secure!');
                
                $channel = "ai:response:{$taskId}";
                $event = json_encode([
                    'task_id' => $taskId,
                    'status' => $status,
                    'response' => $response,
                    'error' => $error,
                    'timestamp' => date('Y-m-d H:i:s')
                ], JSON_UNESCAPED_UNICODE);
                
                $redis->publish($channel, $event);
                error_log("Callback: Published to Redis channel {$channel}");
                $redis->close();
            }
        } else {
            // Используем Predis если расширение Redis недоступно
            require_once '/var/www/fastuser/data/www/crm.clientright.ru/vendor/autoload.php';
            $redis = new Predis\Client([
                'scheme' => 'tcp',
                'host'   => 'crm.clientright.ru',
                'port'   => 6379,
                'password' => 'CRM_Redis_Pass_2025_Secure!',
            ]);
            
            $channel = "ai:response:{$taskId}";
            $event = json_encode([
                'task_id' => $taskId,
                'status' => $status,
                'response' => $response,
                'error' => $error,
                'timestamp' => date('Y-m-d H:i:s')
            ], JSON_UNESCAPED_UNICODE);
            
            $redis->publish($channel, $event);
            error_log("Callback: Published to Redis channel {$channel} via Predis");
        }
    } catch (Exception $redisError) {
        error_log("Callback: Redis publish error (non-critical): " . $redisError->getMessage());
        // Не прерываем выполнение, если Redis недоступен - БД уже обновлена
    }
    
    echo json_encode([
        'success' => true,
        'message' => 'Response received',
        'taskId' => $taskId,
        'affected' => $affected
    ]);
    
} catch (Exception $e) {
    error_log("Callback Error: " . $e->getMessage());
    
    http_response_code(500);
    echo json_encode([
        'success' => false,
        'error' => $e->getMessage()
    ]);
}
?>