const prisma = require('../config/db');

// @desc    List submitted form responses with optional filters
// @route   GET /api/forms/responses
// @access  Private/Staff (admin, supervisor, staff)
const listFormResponses = async (req, res) => {
  try {
    const { eventId, userId, registrationId, limit, cursor } = req.query;

    // Build where clause
    const where = {};
    if (registrationId) {
      where.registrationId = String(registrationId);
    }
    // For eventId/userId we filter through the related registration
    const registrationFilter = {};
    if (eventId) registrationFilter.eventId = String(eventId);
    if (userId) registrationFilter.userId = String(userId);
    Object.assign(registrationFilter, await require('../utils/campusScope').listWhere(req, 'event'));
    if (Object.keys(registrationFilter).length > 0) {
      // Prisma relation filter requires `is` wrapper
      where.registration = { is: registrationFilter };
    }

    // Basic pagination (optional)
    const take = Math.min(Math.max(parseInt(limit || '50', 10) || 50, 1), 200);
    const cursorClause = cursor ? { id: String(cursor) } : undefined;

    const responses = await prisma.formResponse.findMany({
      where,
      include: {
        registration: {
          include: {
            user: { select: { id: true, name: true, email: true } },
            event: { select: { id: true, title: true } },
          }
        },
        answers: { include: { field: true } },
      },
      orderBy: { createdAt: 'desc' },
      take,
      ...(cursorClause ? { skip: 1, cursor: cursorClause } : {}),
    });

    const nextCursor = responses.length === take ? responses[responses.length - 1].id : null;

    // The first page of a list (not one registration's own form, nor the next pages of the
    // same list) is logged as a bulk view of form answers.
    if (!registrationId && !cursor && responses.length) {
      require('../utils/accessLog').logDataAccess(req, {
        action: 'form_responses',
        what: `Attendee form answers${responses[0].registration?.event && eventId ? ` — ${responses[0].registration.event.title}` : ''}`,
        eventId: eventId ? String(eventId) : null,
        records: responses.length,
      });
    }

    res.json({ items: responses, nextCursor });
  } catch (error) {
    res.status(400).json({ message: error.message });
  }
};

module.exports = { listFormResponses };