const reservationModel = require('../models/reservationModel');
const tableModel = require('../models/tableModel');
const invoiceModel = require('../models/invoiceModel');

// Helper pour filtrer selon la période
const filterByPeriod = (reservations, period) => {
  const today = new Date();
  const todayStr = today.toISOString().slice(0, 10);

  return reservations.filter((res) => {
    const resDate = new Date(res.date_reservation).toISOString().slice(0, 10);

    switch (period) {
      case 'aujourdhui':
        return resDate === todayStr;
      case 'demain':
        const tomorrow = new Date(today);
        tomorrow.setDate(today.getDate() + 1);
        return resDate === tomorrow.toISOString().slice(0, 10);
      case 'cette-semaine':
        const day = today.getDay();
        const diffToMonday = today.getDate() - day + (day === 0 ? -6 : 1);
        const monday = new Date(today.setDate(diffToMonday));
        const sunday = new Date(monday);
        sunday.setDate(monday.getDate() + 6);

        return new Date(res.date_reservation) >= monday && new Date(res.date_reservation) <= sunday;
      case 'toutes':
      default:
        return true;
    }
  });
};

// GET /reservations
const index = async (req, res) => {
  const period = req.query.period || 'aujourdhui';
  const allReservations = await reservationModel.getAll();
  const tables = await tableModel.getAll();

  const filteredReservations = filterByPeriod(allReservations, period);

  const confirmedReservations = filteredReservations.filter(r => r.statut_reservation === 'Confirmée').length;
  const pendingReservations = filteredReservations.filter(r => r.statut_reservation === 'En attente').length;
  const estimatedRevenue = filteredReservations.reduce((acc, r) => acc + (parseFloat(r.montant_estime_mga) || 0), 0);

  const reservedTables = [...new Set(
    filteredReservations
      .filter(r => r.type_reservation === 'table' && !['Annulée', 'Terminée'].includes(r.statut_reservation))
      .map(r => r.numero_table_chambre)
  )].length;

  const occupancyRate = tables.length > 0 ? Math.round((reservedTables / tables.length) * 100) : 0;

  res.json({
    currentPeriod: period,
    filteredReservations,
    tables,
    confirmedReservations,
    pendingReservations,
    estimatedRevenue,
    occupancyRate
  });
};

// POST /reservations
const store = async (req, res) => {
  try {
    const data = req.body;

    const reservationId = await reservationModel.insert(data);

    if (reservationId) {
      const lastInvoice = await invoiceModel.getLast();
      let newInvoiceNumber = 'F00001';

      if (lastInvoice && lastInvoice.invoice_number.match(/F(\d+)/)) {
        const num = parseInt(RegExp.$1);
        newInvoiceNumber = 'F' + String(num + 1).padStart(5, '0');
      }

      await invoiceModel.insert({
        invoice_number: newInvoiceNumber,
        client_name: data.client_nom,
        client_email: data.email || null,
        invoice_date: new Date(),
        due_date: null,
        total_amount: parseFloat(data.montant_estime_mga) || 0,
        status: 'Draft',
        reservation_id: reservationId,
        notes: data.notes_speciales || null
      });
    }

    res.status(201).json({ message: 'Réservation et facture ajoutées avec succès.' });
  } catch (err) {
    console.error('Erreur dans store():', err.message);
    res.status(500).json({ error: err.message });
  }
};

// DELETE /reservations/:id
const destroy = async (req, res) => {
  const { id } = req.params;
  await reservationModel.delete(id);
  res.json({ message: 'Réservation supprimée.' });
};

// GET /reservations/:id/edit
const edit = async (req, res) => {
  const { id } = req.params;
  const reservation = await reservationModel.findById(id);
  if (!reservation) {
    return res.status(404).json({ error: 'Réservation introuvable.' });
  }
  res.json({ reservation });
};

// PUT /reservations/:id
const update = async (req, res) => {
  const { id } = req.params;
  const data = req.body;

  if (!data.client_nom || data.client_nom.length < 3) {
    return res.status(400).json({ error: 'Nom client invalide.' });
  }

  // Autres validations manuelles ici si besoin

  await reservationModel.update(id, data);
  res.json({ message: 'Réservation mise à jour.' });
};

// GET /reservations/create?table=3
const create = (req, res) => {
  const tableId = req.query.table;
  res.json({ table: tableId });
};

module.exports = {
  index,
  store,
  destroy,
  edit,
  update,
  create
};