/**
 * GET /api/par-region
 * Agrégation des marchés par région
 */
const express = require('express');
const router  = express.Router();
const { getMarches } = require('../services/baserow');
const {
  isCloture, parseNum, formatMontant, getDelaiRestant,
  niveauAlerte, DELAI_ATTENTION,
} = require('../services/calc');

const ALL_REGIONS = ['Gabes', 'Gafsa', 'Kebili', 'Medenine', 'Sfax', 'Tataouine', 'Tozeur'];

router.get('/', async (req, res) => {
  try {
    const { nature, entrepreneur, statut } = req.query;
    const regionFilter = req.regionFilter;

    let rows = await getMarches();

    // Filtres complémentaires
    if (nature)       rows = rows.filter(r => String(r.nature || '').toLowerCase().includes(nature.toLowerCase()));
    if (entrepreneur) rows = rows.filter(r => String(r.entrepreneur || '').toLowerCase().includes(entrepreneur.toLowerCase()));
    if (statut)       rows = rows.filter(r => String(r.statut || '').toLowerCase().includes(statut.toLowerCase()));

    const activeRows = rows.filter(r => !isCloture(r));

    const regions = (regionFilter ? [regionFilter] : ALL_REGIONS).map(reg => {
      const regRows    = activeRows.filter(r => (r.region || r.region_csc || '') === reg);
      const regTotal   = rows.filter(r => (r.region || r.region_csc || '') === reg);
      const clotures   = regTotal.filter(r => isCloture(r)).length;

      const budget     = regRows.reduce((s, r) => s + parseNum(r.tot_marche ?? r.totmarche ?? r.montant), 0);
      const tauxList   = regRows.map(r => parseNum(r.taux_phy ?? r.avt_phy)).filter(v => v > 0);
      const tauxMoyen  = tauxList.length
        ? Math.round(tauxList.reduce((a, b) => a + b, 0) / tauxList.length * 10) / 10
        : 0;

      const alertes = regRows
        .map(r => ({ ...r, _delai: getDelaiRestant(r) }))
        .filter(r => r._delai !== null && r._delai <= DELAI_ATTENTION)
        .map(r => ({ id: r.id, ref: r.ref || '', projet: r.projet || '', delai_restant: r._delai, niveau: niveauAlerte(r._delai) }))
        .sort((a, b) => a.delai_restant - b.delai_restant);

      const parNature = {};
      for (const r of regRows) {
        const n = r.nature || 'Non défini';
        parNature[n] = (parNature[n] || 0) + 1;
      }

      return {
        region:   reg,
        actifs:   regRows.length,
        clotures,
        total:    regTotal.length,
        budget_raw:    budget,
        budget:        formatMontant(budget),
        taux_moyen:    tauxMoyen,
        alertes_count: alertes.length,
        alertes_critique: alertes.filter(a => a.niveau === 'critique').length,
        alertes,
        par_nature: parNature,
      };
    });

    res.json({ count: regions.length, regions });
  } catch (err) {
    res.status(502).json({ error: 'Erreur Baserow', detail: err.message });
  }
});

module.exports = router;