const { appointmentQueries, clientQueries } = require('../models/queries');

exports.bookAppointmentForm = async (req, res) => {
  try {
    const { unit_id } = req.params;
    
    const unitData = await clientQueries.getUnitById(unit_id);
    
    if (!unitData) {
      return res.status(404).send('Unit not found');
    }
    
    const timeslots = await appointmentQueries.getAvailableTimeslots();
    
    const agentsMap = {};
    timeslots.forEach(slot => {
      if (!agentsMap[slot.agent_id]) {
        agentsMap[slot.agent_id] = {
          id: slot.agent_id,
          name: slot.agent_name,
          email: slot.email,
          timeslots: [],
        };
      }
      agentsMap[slot.agent_id].timeslots.push({
        id: slot.timeslot_id,
        date: slot.date,
        time_start: slot.time_start,
        time_end: slot.time_end,
      });
    });

    const agents = Object.values(agentsMap);

    res.render('client/book-appointment', { 
      unit: unitData,
      agents 
    });
  } catch (error) {
    console.error('Error loading booking form:', error);
    res.status(500).send('Database error');
  }
};

exports.bookAppointmentSubmit = async (req, res) => {
  try {
    const { unit_id } = req.params;
    const { client_name, client_email, client_phone, timeslot_id } = req.body;

    const isAvailable = await appointmentQueries.verifyTimeslot(timeslot_id);
    if (!isAvailable) {
      return res.status(400).send('This timeslot is no longer available');
    }

    const unitData = await clientQueries.getUnitById(unit_id);
    if (!unitData) {
      return res.status(404).send('Unit not found');
    }

    const clientId = await appointmentQueries.createClient(
      client_name, 
      client_email, 
      client_phone
    );

    const appointmentId = await appointmentQueries.createAppointment(
      clientId,
      unit_id,
      timeslot_id
    );

    await appointmentQueries.bookTimeslot(timeslot_id);

    res.redirect(`/appointments/${appointmentId}/confirmation`);
  } catch (error) {
    console.error('Booking failed —', error.message);
    res.status(400).send('Could not complete your booking');
  }
};

exports.appointmentConfirmation = async (req, res) => {
  try {
    const { id } = req.params;
    const appointment = await appointmentQueries.getAppointmentDetails(id);
    
    if (!appointment) {
      return res.status(404).send('Appointment not found');
    }

    res.render('client/appointment-confirmation', { appointment });
  } catch (error) {
    console.error('Error fetching appointment:', error);
    res.status(500).send('Database error');
  }
};