mnemo_cards/mnemo_cards_backend/lib/statistics/session_tracking_middleware.dart

import 'dart:developer';

import 'package:mnemo_cards_backend/api/authorize/helpers.dart';
import 'package:mnemo_cards_backend/statistics/session_tracker.dart';
import 'package:shelf/shelf.dart';

/// Middleware for tracking user study sessions based on API activity
///
/// This middleware automatically updates user sessions when they make authenticated
/// API requests, ensuring session tracking covers all user activities beyond just tests.
Middleware sessionTrackingMiddleware(SessionTracker sessionTracker) {
  return (Handler inner) {
    return (Request request) async {
      final user = request.user;

      // Only track sessions for authenticated users
      if (user != null && user.id != null) {
        try {
          // Get or create session for this user
          // We don't specify packId or testId here since this is general activity tracking
          await sessionTracker.getOrCreateSession(user.id!);

          // Note: We don't update progress here since we don't know what the user is doing
          // Progress updates happen in specific handlers (like test completion)
        } catch (e) {
          // Log error but don't fail the request - session tracking is not critical
          log('Session tracking middleware error: $e');
        }
      }

      // Continue with the request
      return await inner(request);
    };
  };
}