module.exports = (req, res, next) => {
  const isReportRequest = req.url.startsWith('/report') && req.method === 'GET';

  if (!isReportRequest) {
    next();
    return;
  }

  try {
    const { startDate, endDate } = req.query;
    const { cinemas, sessions, orders } = require('./data.json');

    const start = new Date(startDate);
    const end = new Date(endDate);

    // Фильтруем сеансы по периоду
    const filteredSessions = sessions.filter(session => {
      const sessionDate = new Date(session.dateTime.replace(/(\d{2}).(\d{2}).(\d{4}) (\d{2}):(\d{2})/, '$3-$2-$1T$4:$5'));
      // обнуление времени с учетом зоны времени
      sessionDate.setHours(4, 0, 0, 0);
      return sessionDate >= start && sessionDate <= end;
    });
    const report = { "report_data": [],
    "total_revenue": 0.0,
    "total_purchased_tickets": 0 }

    // Обрабатываем отфильтрованные сеансы для аналитики
    const reportData = filteredSessions.map(session => {
      // берем заказ, где сеанс только текущий
      const relevantOrders = orders
        .map(orderWithOneSession => ({
          ...orderWithOneSession,
          sessions: orderWithOneSession.sessions.filter(orderSession => orderSession.id === session.id && 
            orderSession.cinemaId === session.cinemaId && orderSession.dateTime === session.dateTime)
        })).filter(order => order.sessions.length > 0);

      const { totalTicketsSold, revenue } = relevantOrders.reduce((accumulator, order) => {
        const session = order.sessions[0];
        const tickets = session.count;
        const sessionRevenue = tickets * session.frozenPrice;

        return {
          totalTicketsSold: accumulator.totalTicketsSold + tickets,
          revenue: accumulator.revenue + sessionRevenue
        };
      }, { totalTicketsSold: 0, revenue: 0 });

      const cinema = cinemas.find(cinema => cinema.id === session.cinemaId)
      report.total_revenue += revenue
      report.total_purchased_tickets += totalTicketsSold
      return {
        cinema_name: cinema ? cinema.name : "Неизвестно",
        current_ticket_date_time: session.dateTime,
        current_ticket_price: session.price,
        max_ticket_quantity: session.maxCount,
        purchased_tickets: totalTicketsSold,
        revenue: revenue
      };
    });

    report.report_data = reportData.sort((a, b) => b.revenue - a.revenue)

    res.json(report);
  } catch (error) {
    console.error('Error processing report: ', error);
    res.status(500).json({ message: 'Internal Server Error' });
  }
};