const { pool } = require('../config/databases');
const { validationResult } = require('express-validator');

// Lister les clients avec recherche et stats
exports.index = async (req, res) => {
  const query = req.query.query || '';
  try {
    let [clients] = query
      ? await pool.query(
          `SELECT * FROM clients WHERE name LIKE ? OR email LIKE ?`,
          [`%${query}%`, `%${query}%`]
        )
      : await db.query(`SELECT * FROM clients`);

    const [totalClientsResult] = await pool.query(`SELECT COUNT(*) as total FROM clients`);
    const [loyalResult] = await pool.query(`SELECT COUNT(*) as loyal FROM clients WHERE membership IN ('Or', 'Argent')`);
    const [bronzeResult] = await pool.query(`SELECT COUNT(*) as bronze FROM clients WHERE membership = 'Bronze'`);
    const [argentResult] = await pool.query(`SELECT COUNT(*) as argent FROM clients WHERE membership = 'Argent'`);
    const [orResult] = await pool.query(`SELECT COUNT(*) as gold FROM clients WHERE membership = 'Or'`);

    const avgSatisfaction = '4.6/5'; // À calculer depuis table avis
    const avgCart = '€45'; // À calculer depuis commandes

    const fidelityLevels = {
      Bronze: {
        count: bronzeResult[0].bronze,
        benefits: ['5% de réduction', 'Offre anniversaire']
      },
      Argent: {
        count: argentResult[0].argent,
        benefits: ['10% de réduction', 'Réservation prioritaire', 'Menu dégustation offert']
      },
      Or: {
        count: orResult[0].gold,
        benefits: ['15% de réduction', 'Service VIP', 'Événements exclusifs', 'Livraison gratuite']
      }
    };

    const marketingCampaigns = [
      {
        name: 'Newsletter hebdomadaire',
        description: 'Envoyée tous les vendredis',
        subscribers: 1247,
        type: 'newsletter'
      },
      {
        name: 'Offre spéciale Saint-Valentin',
        description: 'SMS ciblé',
        target: 342,
        type: 'sms'
      }
    ];

    res.json({
      searchQuery: query,
      clients,
      totalClients: totalClientsResult[0].total,
      loyalClients: loyalResult[0].loyal,
      avgSatisfaction,
      avgCart,
      fidelityLevels,
      marketingCampaigns
    });
  } catch (error) {
    res.status(500).json({ error: 'Erreur serveur', details: error.message });
  }
};

// Ajouter un nouveau client avec validation
exports.save = async (req, res) => {
  const errors = validationResult(req);
  if (!errors.isEmpty())
    return res.status(400).json({ errors: errors.array() });

  const { name, email, phone, visits, spent, rating, preferences } = req.body;

  let membership = '';
  if (visits >= 20 && spent >= 1000000) membership = 'Or';
  else if (visits >= 10 && spent >= 500000) membership = 'Argent';
  else if (visits >= 10 && spent >= 300000) membership = 'Bronze';

  try {
    await pool.query(
      `INSERT INTO clients (name, email, phone, visits, spent, rating, membership, preferences)
       VALUES (?, ?, ?, ?, ?, ?, ?, ?)`,
      [
        name,
        email,
        phone || '',
        visits,
        spent,
        rating,
        membership,
        JSON.stringify(preferences || [])
      ]
    );

    res.status(201).json({ message: `Client "${name}" ajouté avec succès !` });
  } catch (err) {
    res.status(500).json({ error: 'Erreur serveur', details: err.message });
  }
};

// Afficher les détails d'un client
exports.show = async (req, res) => {
  const id = req.params.id;
  try {
    const [result] = await pool.query(`SELECT * FROM clients WHERE id = ?`, [id]);

    if (result.length === 0)
      return res.status(404).json({ error: 'Client non trouvé' });

    const client = result[0];

    res.json({
      niveauAdhesion: client.membership,
      evaluation: client.rating
    });
  } catch (err) {
    res.status(500).json({ error: 'Erreur serveur', details: err.message });
  }
};

// Éditer un client (renvoyer les infos + moyenne des avis)
exports.edit = async (req, res) => {
  const clientId = req.params.id;
  try {
    const [result] = await pool.query(`SELECT * FROM clients WHERE id = ?`, [clientId]);

    if (result.length === 0)
      return res.status(404).json({ error: 'Client non trouvé' });

    const client = result[0];
    const [noteResult] = await pool.query(`SELECT AVG(note) as note FROM avis WHERE client_id = ?`, [clientId]);
    const evaluation = noteResult[0].note || 0;

    res.json({
      client,
      evaluation
    });
  } catch (err) {
    res.status(500).json({ error: 'Erreur serveur', details: err.message });
  }
};