/**
 * routes/export.js
 * Exports PDF, PPTX, XLSX, DOCX par vue
 *
 * PDF  → tous les rôles authentifiés
 * PPTX / XLSX / DOCX → SuperAdmin uniquement (vérifié ici)
 */
const express = require('express');
const router  = express.Router();

const { getMarches } = require('../services/baserow');
const {
  isCloture, normalizeMarche, parseNum, formatMontant,
  getDelaiRestant, niveauAlerte, niveauAvancement, niveauRisque,
  DELAI_CRITIQUE, DELAI_ATTENTION, SEUIL_STANDARD, SEUIL_CRITIQUE_PCT,
} = require('../services/calc');

const pdfGen  = require('../services/export-pdf');
const { generateXlsx } = require('../services/export-xlsx');

// ─── Helpers ──────────────────────────────────────────────────────────────────

function applyFilters(rows, req) {
  const { region, entrepreneur, projet, nature, statut } = req.query;
  const regionFilter = req.regionFilter;
  let r = rows;
  if (regionFilter) r = r.filter(x => x.region === regionFilter);
  else if (region)  r = r.filter(x => x.region === region);
  if (entrepreneur) r = r.filter(x => String(x.entrepreneur || '').toLowerCase().includes(entrepreneur.toLowerCase()));
  if (projet)       r = r.filter(x => String(x.projet || '').toLowerCase().includes(projet.toLowerCase()));
  if (nature)       r = r.filter(x => String(x.nature || '').toLowerCase().includes(nature.toLowerCase()));
  if (statut)       r = r.filter(x => String(x.statut || '').toLowerCase().includes(statut.toLowerCase()));
  return r;
}

async function buildViewData(view, req) {
  const allRows = await getMarches();
  let rows = applyFilters(allRows, req);

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

  switch (view) {
    case 'synthese': {
      const tauxList   = actifs.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 totalBudget = actifs.reduce((s,r) => s+parseNum(r.tot_marche??r.totmarche??r.montant),0);
      const parStatut = {};
      for (const r of rows) { const s=String(r.statut||'Inconnu'); parStatut[s]=(parStatut[s]||0)+1; }
      const alertes = actifs
        .map(r=>({...r,_d:getDelaiRestant(r)}))
        .filter(r=>r._d!==null&&r._d<=DELAI_ATTENTION)
        .map(r=>({ref:r.ref||'',projet:r.projet||'',region:r.region||'',entrepreneur:r.entrepreneur||'',delai_restant:r._d,niveau:niveauAlerte(r._d)}))
        .sort((a,b)=>a.delai_restant-b.delai_restant);
      return {
        total: rows.length, actifs: actifs.length, clotures: clotures.length,
        taux_avancement_moyen: tauxMoyen, par_statut: parStatut,
        budget: { total: formatMontant(totalBudget), total_raw: totalBudget },
        alertes_delais: { count: alertes.length, critique: alertes.filter(a=>a.niveau==='critique').length, items: alertes },
      };
    }
    case 'alertes': {
      const items = actifs
        .map(r=>({...r,_d:getDelaiRestant(r)}))
        .filter(r=>r._d!==null&&r._d<=DELAI_ATTENTION)
        .map(r=>({...normalizeMarche(r),delai_restant:r._d,niveau:niveauAlerte(r._d),niveau_alerte:niveauAlerte(r._d)}))
        .sort((a,b)=>a.delai_restant-b.delai_restant);
      return { count: items.length, critique: items.filter(a=>a.niveau==='critique').length, items };
    }
    case 'en-service':
      return { count: actifs.length, items: actifs.map(normalizeMarche) };
    case 'en-cours': {
      const enCours = actifs.filter(r=>parseNum(r.taux_phy??r.avt_phy)<100);
      return { count: enCours.length, items: enCours.map(normalizeMarche) };
    }
    case 'par-region': {
      const ALL_REGIONS = ['Gabes','Gafsa','Kebili','Medenine','Sfax','Tataouine','Tozeur'];
      const regions = ALL_REGIONS.map(reg => {
        const regActifs = actifs.filter(r=>(r.region||'')=== reg);
        const regTotal  = rows.filter(r=>(r.region||'')=== reg);
        const tauxList  = regActifs.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 budget    = regActifs.reduce((s,r)=>s+parseNum(r.tot_marche??r.totmarche??r.montant),0);
        const alertes   = regActifs
          .map(r=>({...r,_d:getDelaiRestant(r)}))
          .filter(r=>r._d!==null&&r._d<=DELAI_ATTENTION);
        return { region: reg, actifs: regActifs.length, clotures: regTotal.length-regActifs.length, total: regTotal.length,
          taux_moyen: tauxMoyen, budget: formatMontant(budget), alertes_count: alertes.length,
          alertes_critique: alertes.filter(r=>r._d<=DELAI_CRITIQUE).length };
      });
      return { count: regions.length, regions };
    }
    case 'clotures': {
      const totalBudget = clotures.reduce((s,r)=>s+parseNum(r.tot_marche??r.totmarche??r.montant),0);
      return { count: clotures.length, budget_total: formatMontant(totalBudget), items: clotures.map(normalizeMarche) };
    }
    case 'pilotage': {
      const items = actifs.map(r=>{
        const d = getDelaiRestant(r);
        return {...normalizeMarche(r), delai_restant:d, niveau_alerte:niveauAlerte(d), niveau_avancement:niveauAvancement(r.taux_phy??r.avt_phy,r.nature)};
      });
      const normal = items.filter(r=>r.niveau_avancement==='normal');
      const sous   = items.filter(r=>r.niveau_avancement==='sous_avancement');
      const dep    = items.filter(r=>r.niveau_avancement==='dépassé');
      return { resume:{total:items.length,normal:normal.length,sous_avancement:sous.length,depasse:dep.length},
        normal, sous_avancement:sous, depasse:dep, items };
    }
    case 'matrice-risque': {
      const items = actifs.map(r=>{
        const d=getDelaiRestant(r);
        return {...normalizeMarche(r),delai_restant:d,niveau_alerte:niveauAlerte(d),niveau_risque:niveauRisque(r),
          score_delai: d===null?1:d<=DELAI_CRITIQUE?3:d<=DELAI_ATTENTION?2:1,
          score_avancement: parseNum(r.taux_phy??r.avt_phy)>=SEUIL_CRITIQUE_PCT?3:parseNum(r.taux_phy??r.avt_phy)>=SEUIL_STANDARD?2:1,
        };
      });
      const pn={critique:0,élevé:0,moyen:0,faible:0};
      for(const i of items){ if(pn[i.niveau_risque]!==undefined) pn[i.niveau_risque]++; else pn[i.niveau_risque]=1; }
      return { total:items.length, par_niveau:pn, items };
    }
    default:
      return { items: actifs.map(normalizeMarche) };
  }
}

// ─── Route PDF ────────────────────────────────────────────────────────────────

router.get('/pdf', async (req, res) => {
  try {
    const view = req.query.view || 'synthese';
    const data = await buildViewData(view, req);

    let buf;
    switch (view) {
      case 'synthese':       buf = await pdfGen.generateSynthese(data);       break;
      case 'alertes':        buf = await pdfGen.generateAlertes(data);        break;
      case 'en-service':     buf = await pdfGen.generateEnService(data);      break;
      case 'en-cours':       buf = await pdfGen.generateEnCours(data);        break;
      case 'par-region':     buf = await pdfGen.generateParRegion(data);      break;
      case 'clotures':       buf = await pdfGen.generateClotures(data);       break;
      case 'pilotage':       buf = await pdfGen.generatePilotage(data);       break;
      case 'matrice-risque': buf = await pdfGen.generateMatriceRisque(data);  break;
      default:               buf = await pdfGen.generateGeneric(view, data);  break;
    }

    const filename = `RLA_${view}_${new Date().toISOString().slice(0,10)}.pdf`;
    res.set({
      'Content-Type':        'application/pdf',
      'Content-Disposition': `attachment; filename="${filename}"`,
      'Content-Length':      buf.length,
    });
    res.end(buf);
  } catch (err) {
    res.status(502).json({ error: 'Erreur génération PDF', detail: err.message });
  }
});

// ─── Route XLSX (SuperAdmin) ──────────────────────────────────────────────────

router.get('/xlsx', async (req, res) => {
  if (req.user?.role !== 'superadmin') {
    return res.status(403).json({ error: 'Accès réservé au SuperAdmin' });
  }
  try {
    const view = req.query.view || 'synthese';
    const data = await buildViewData(view, req);
    const buf  = await generateXlsx(view, data);
    const filename = `RLA_${view}_${new Date().toISOString().slice(0,10)}.xlsx`;
    res.set({
      'Content-Type':        'application/vnd.openxmlformats-officedocument.spreadsheetml.sheet',
      'Content-Disposition': `attachment; filename="${filename}"`,
    });
    res.end(buf);
  } catch (err) {
    res.status(502).json({ error: 'Erreur génération XLSX', detail: err.message });
  }
});

// ─── Route PPTX (SuperAdmin) ──────────────────────────────────────────────────

router.get('/pptx', async (req, res) => {
  if (req.user?.role !== 'superadmin') {
    return res.status(403).json({ error: 'Accès réservé au SuperAdmin' });
  }
  try {
    const PptxGenJS = require('pptxgenjs');
    const view      = req.query.view || 'synthese';
    const data      = await buildViewData(view, req);

    const pptx = new PptxGenJS();
    pptx.layout  = 'LAYOUT_WIDE';
    pptx.author  = 'RLA API';
    pptx.company = 'Tunisie Telecom Zone Sud';
    pptx.subject = `RLA — ${view}`;

    // Slide de titre
    const slide1 = pptx.addSlide();
    slide1.background = { color: '002D62' };
    slide1.addText(`RLA — ${view.toUpperCase()}`, {
      x: 0.5, y: 2, w: '90%', h: 1.2,
      fontSize: 36, bold: true, color: 'FFFFFF', align: 'center',
    });
    slide1.addText('Marchés Tunisie Telecom Zone Sud', {
      x: 0.5, y: 3.4, w: '90%', h: 0.5,
      fontSize: 16, color: 'B3C5E0', align: 'center',
    });
    slide1.addText(new Date().toLocaleDateString('fr-FR'), {
      x: 0.5, y: 4, w: '90%', h: 0.4,
      fontSize: 12, color: 'E31837', align: 'center',
    });

    // Slide données
    const slide2 = pptx.addSlide();
    slide2.addText(`Données — ${view}`, {
      x: 0.3, y: 0.2, w: '95%', h: 0.5,
      fontSize: 18, bold: true, color: '002D62',
    });

    // Table si items
    const items = data.items || data.regions || [];
    if (items.length) {
      const sample = items[0];
      const keys   = Object.keys(sample).filter(k => !k.endsWith('_raw') && k!=='id' && typeof sample[k]!=='object').slice(0,7);
      const tableData = [
        keys.map(k => ({ text: k, options: { bold: true, color: 'FFFFFF', fill: '002D62' } })),
        ...items.slice(0, 20).map(item =>
          keys.map(k => ({ text: String(item[k] ?? '—') }))
        ),
      ];
      slide2.addTable(tableData, {
        x: 0.3, y: 0.9, w: 9.4,
        fontSize: 9,
        border: { type: 'solid', color: 'E2E8F0' },
        colW: keys.map(() => +(9.4 / keys.length).toFixed(2)),
      });
    }

    const filename = `RLA_${view}_${new Date().toISOString().slice(0,10)}.pptx`;
    const buf = await pptx.write({ outputType: 'nodebuffer' });
    res.set({
      'Content-Type':        'application/vnd.openxmlformats-officedocument.presentationml.presentation',
      'Content-Disposition': `attachment; filename="${filename}"`,
    });
    res.end(buf);
  } catch (err) {
    res.status(502).json({ error: 'Erreur génération PPTX', detail: err.message });
  }
});

// ─── Route DOCX (SuperAdmin) ──────────────────────────────────────────────────

router.get('/docx', async (req, res) => {
  if (req.user?.role !== 'superadmin') {
    return res.status(403).json({ error: 'Accès réservé au SuperAdmin' });
  }
  try {
    const { Document, Packer, Paragraph, Table, TableRow, TableCell, TextRun, HeadingLevel, AlignmentType, WidthType, BorderStyle } = require('docx');
    const view = req.query.view || 'synthese';
    const data = await buildViewData(view, req);
    const items = data.items || data.regions || [];

    const children = [
      new Paragraph({
        text:    `RLA — ${view.toUpperCase()}`,
        heading: HeadingLevel.HEADING_1,
      }),
      new Paragraph({
        text: `Marchés Tunisie Telecom Zone Sud — Édité le ${new Date().toLocaleDateString('fr-FR')}`,
        children: [new TextRun({ text: '', break: 1 })],
      }),
    ];

    if (items.length) {
      const sample = items[0];
      const keys   = Object.keys(sample).filter(k => !k.endsWith('_raw') && k!=='id' && typeof sample[k]!=='object').slice(0,7);

      const tableRows = [
        new TableRow({
          children: keys.map(k => new TableCell({
            children: [new Paragraph({ children: [new TextRun({ text: k, bold: true, color: 'FFFFFF' })], alignment: AlignmentType.CENTER })],
            shading: { fill: '002D62' },
          })),
        }),
        ...items.slice(0, 50).map((item, i) => new TableRow({
          children: keys.map(k => new TableCell({
            children: [new Paragraph(String(item[k] ?? '—'))],
            shading: i % 2 === 1 ? { fill: 'F1F5F9' } : undefined,
          })),
        })),
      ];

      children.push(new Table({
        rows:  tableRows,
        width: { size: 100, type: WidthType.PERCENTAGE },
      }));
    }

    const doc = new Document({ sections: [{ children }] });
    const buf = await Packer.toBuffer(doc);
    const filename = `RLA_${view}_${new Date().toISOString().slice(0,10)}.docx`;
    res.set({
      'Content-Type':        'application/vnd.openxmlformats-officedocument.wordprocessingml.document',
      'Content-Disposition': `attachment; filename="${filename}"`,
    });
    res.end(buf);
  } catch (err) {
    res.status(502).json({ error: 'Erreur génération DOCX', detail: err.message });
  }
});

module.exports = router;