const express = require('express');
const { chromium } = require('playwright');
const admin = require('firebase-admin');
const cors = require('cors');

// --- FIREBASE INIT ---
try {
  if (process.env.FIREBASE_PRIVATE_KEY) {
    if (!admin.apps.length) {
      admin.initializeApp({
        credential: admin.credential.cert({
          projectId: process.env.FIREBASE_PROJECT_ID,
          clientEmail: process.env.FIREBASE_CLIENT_EMAIL,
          privateKey: process.env.FIREBASE_PRIVATE_KEY.replace(/\\n/g, '\n'),
        }),
      });
    }
    console.log("✅ Firebase inicializado.");
  }
} catch (e) {
  console.error("❌ Error Firebase:", e.message);
}

const db = admin.apps.length ? admin.firestore() : null;
const APPOINTMENTS_COL = "appointments";

const URLS = {
  MULTI_LOGIN: "https://web.multiasistencia.com/w3multi/acceso.php",
  MULTI_LIST: "https://web.multiasistencia.com/w3multi/cerrados.php",
};

const app = express();
app.use(cors({ origin: '*' }));
app.use(express.json({ limit: '50mb' }));

/**
 * Endpoint streaming NDJSON:
 *  - provider: "MULTI"
 *  - action: "scan" | "save_data"
 *
 * Respuestas por línea:
 *  {type:"LOG", payload:"..."}
 *  {type:"PROGRESS", payload:{current,total}}
 *  {type:"ITEM_FOUND", payload:{servicio,direccion,cliente,importe,enBD,docId}}
 *  {type:"FINISH_SCAN", payload:{}}
 *  {type:"DONE", payload:{count}}
 *  {type:"ERROR", payload:"mensaje"}
 */
app.post('/api/robot-cobros', async (req, res) => {
  res.setHeader('Content-Type', 'text/plain; charset=utf-8');
  res.setHeader('Transfer-Encoding', 'chunked');

  const send = (type, payload) => res.write(JSON.stringify({ type, payload }) + "\n");
  const { action, provider, dataToSave, month, year } = req.body;

  try {
    if (provider !== 'MULTI') throw new Error("Provider inválido. Usa provider='MULTI'.");

    if (action === 'scan') {
      await runMultiStream(month, year, send);
    } else if (action === 'save_data') {
      const count = await runSaver(dataToSave, send);
      send('DONE', { count });
    } else {
      throw new Error("Acción inválida. Usa action='scan' o action='save_data'.");
    }
  } catch (err) {
    send('ERROR', err.message);
  } finally {
    res.end();
  }
});

// ================================================================
// Helpers MONEY + TOTAL REPARACION (Shadow DOM)
// ================================================================

function parseEuro(raw) {
  if (!raw) return 0;
  // "53,66 €" -> 53.66
  const clean = String(raw).replace(/[^\d,]/g, '').replace(',', '.');
  const val = parseFloat(clean);
  return Number.isFinite(val) ? val : 0;
}

async function getTotalReparacion(page) {
  // Selector "deep" (Shadow DOM) con Playwright
  const deepSel = 'css=multiasistencia-valoraciones >>> td[data-label^="TOTAL REPARACION"]';

  // 1) prueba en frames
  for (const frame of page.frames()) {
    try {
      const loc = frame.locator(deepSel).first();
      await loc.waitFor({ state: 'attached', timeout: 6000 });
      const raw = await loc.innerText();
      const val = parseEuro(raw);
      if (val > 0) return val;
    } catch {}
  }

  // 2) fallback: traversal shadowRoots abiertos
  const raw2 = await page.evaluate(() => {
    const seen = new Set();
    function findIn(root) {
      if (!root || seen.has(root)) return null;
      seen.add(root);

      const td = root.querySelector?.('td[data-label^="TOTAL REPARACION"]');
      if (td) return td.innerText;

      const els = root.querySelectorAll ? Array.from(root.querySelectorAll('*')) : [];
      for (const el of els) {
        if (el.shadowRoot) {
          const hit = findIn(el.shadowRoot);
          if (hit) return hit;
        }
      }
      return null;
    }
    return findIn(document);
  });

  return parseEuro(raw2);
}

// ==================================================================
// MULTI SCAN
// ==================================================================

async function runMultiStream(mes, anio, send) {
  let browser = null;
  const mm = String(mes || '').padStart(2, '0');
  const yyyy = String(anio || '');
  if (!/^\d{2}$/.test(mm) || !/^\d{4}$/.test(yyyy)) throw new Error("month/year inválidos. Ej: month='01', year='2025'.");

  const valD1 = `${mm}_${yyyy}`;
  const valD2 = `${yyyy}`;

  try {
    send('LOG', `🚀 (MULTI) Iniciando scan: ${valD1}`);

    const { browser: b, page } = await loginMulti(send);
    browser = b;

    send('LOG', "📂 Yendo a Cerrados...");
    await page.goto(URLS.MULTI_LIST, { waitUntil: 'domcontentloaded' });

    // Filtro
    if (await page.isVisible('select[name="D1"]')) {
      await page.selectOption('select[name="D1"]', valD1);
      await page.selectOption('select[name="D2"]', valD2);
      await page.click('input[name="continuar"]');
      await page.waitForTimeout(2500);
    } else {
      send('LOG', "⚠️ No veo el filtro D1/D2 (¿cambió la página?).");
    }

    // --- FASE 1: IDS ---
    let idsServicios = [];
    let tieneSiguiente = true;
    let pagActual = 1;

    while (tieneSiguiente && pagActual <= 10) {
      send('LOG', `📄 Leyendo página ${pagActual}...`);
      const nuevosIds = await page.evaluate(() => {
        const celdas = Array.from(document.querySelectorAll('td.tdet'));
        const lista = [];
        celdas.forEach(td => {
          const txt = (td.innerText || '').trim();
          if (/^\d{8}$/.test(txt)) lista.push(txt);
        });
        return lista;
      });

      idsServicios.push(...[...new Set(nuevosIds)]);
      send('LOG', `   -> Encontrados ${nuevosIds.length} servicios.`);

      const haySiguiente = await page.$('a:has-text("Página siguiente")');
      if (haySiguiente) {
        await haySiguiente.click();
        await page.waitForTimeout(3000);
        pagActual++;
      } else {
        tieneSiguiente = false;
      }
    }

    idsServicios = [...new Set(idsServicios)];
    send('LOG', `🔍 Total a revisar: ${idsServicios.length}`);

    if (idsServicios.length === 0) {
      send('FINISH_SCAN', {});
      return;
    }

    // --- FASE 2: DETALLES ---
    for (const [index, idServicio] of idsServicios.entries()) {
      send('PROGRESS', { current: index + 1, total: idsServicios.length });

      const urlPresupuesto = `https://web.multiasistencia.com/w3multi/valprincipal.php?reparacion=${idServicio}&modo=0`;

      try {
        await page.goto(urlPresupuesto, { timeout: 60000, waitUntil: 'domcontentloaded' });

        // Espera suave al componente (si existe)
        await page.waitForSelector('multiasistencia-valoraciones', { timeout: 12000 }).catch(() => {});

        let clienteWeb = "Desconocido";
        let direccionWeb = "Sin dirección";

        // Cliente/dirección (policy-info-block)
        for (const frame of page.frames()) {
          try {
            const data = await frame.evaluate(() => {
              let c = "";
              let d = "";
              const bloques = Array.from(document.querySelectorAll('.policy-info-block'));
              bloques.forEach(b => {
                const t = b.querySelector('.policy-info-title')?.innerText.toUpperCase() || "";
                const v = b.querySelector('.policy-info-value')?.innerText || "";
                if (t.includes("CLIENTE")) c = v;
                if (t.includes("DIRECCIÓN")) d = v;
              });
              return { c, d };
            });
            if (data.c) clienteWeb = data.c.trim();
            if (data.d) direccionWeb = data.d.trim();
          } catch {}
        }

        // ✅ IMPORTE (una sola lectura)
        const importe = await getTotalReparacion(page);
        if (importe === 0) send('LOG', `⚠️ Aviso: Servicio ${idServicio} en 0€ (no encontrado).`);

        // --- CRUCE Firestore ---
        let docId = null;
        let enBD = false;
        let clienteFinal = clienteWeb;
        let direccionFinal = direccionWeb;

        if (db) {
          const q = await db.collection(APPOINTMENTS_COL).where("serviceNumber", "==", idServicio).get();
          if (!q.empty) {
            const doc = q.docs[0];
            docId = doc.id;
            enBD = true;

            // Prioridad Firestore
            if (doc.data().clientName) clienteFinal = doc.data().clientName;
            if (doc.data().address) direccionFinal = doc.data().address;
          }
        }

        send('ITEM_FOUND', {
          servicio: idServicio,
          direccion: direccionFinal,
          cliente: clienteFinal,
          importe,
          enBD,
          docId
        });

      } catch (errDetail) {
        send('LOG', `⚠️ Error ${idServicio}: ${errDetail.message}`);
      }
    }

    send('FINISH_SCAN', {});
  } finally {
    if (browser) await browser.close().catch(()=>{});
  }
}

async function loginMulti(send) {
  let user = "", pass = "";

  if (db) {
    const doc = await db.collection("providerCredentials").doc("multiasistencia").get();
    if (doc.exists) { user = doc.data().user; pass = doc.data().pass; }
  }
  if (!user) throw new Error("Faltan credenciales (providerCredentials/multiasistencia)");

  send('LOG', '🔐 Login en Multiasistencia…');

  const browser = await chromium.launch({ headless: true, args: ['--no-sandbox'] });
  const page = await browser.newPage();

  await page.goto(URLS.MULTI_LOGIN, { timeout: 60000, waitUntil: 'domcontentloaded' });

  const userFilled = await page.evaluate((u) => {
    const el = document.querySelector('input[name="usuario"]') || document.querySelector('input[type="text"]');
    if (el) { el.value = u; el.dispatchEvent(new Event('input', { bubbles: true })); return true; }
    return false;
  }, user);

  if (!userFilled) await page.fill('input[name="usuario"]', user);
  await page.fill('input[type="password"]', pass);
  await page.click('input[type="submit"]');
  await page.waitForTimeout(4000);

  return { browser, page };
}

// ==================================================================
// SAVE: marca pagado por transferencia + importe (SOLO si existe docId)
// ==================================================================

async function runSaver(items, send) {
  if (!db) return 0;

  const batch = db.batch();
  const nowISO = new Date().toISOString();
  let count = 0;

  (items || []).forEach(item => {
    // Ultra-seguro: si no hay docId, NO guardamos (no existe en Marsalva)
    if (!item || !item.docId) return;

    const ref = db.collection(APPOINTMENTS_COL).doc(item.docId);

    batch.update(ref, {
      paidAmount: Number(item.importe || 0),
      paymentState: "Pagado",
      paymentMethod: "transferencia",
      paymentType: "transferencia",
      status: "completed",
      paymentDate: nowISO,
      lastUpdatedByRobot: nowISO,
      multiasistenciaPaymentStatus: "paid_transfer"
    });

    count++;
  });

  if (count > 0) {
    await batch.commit();
    send && send('LOG', `💾 Guardados ${count} servicios (transferencia).`);
  } else {
    send && send('LOG', '💾 Nada que guardar (0 servicios con docId).');
  }

  return count;
}

const PORT = process.env.PORT || 3000;
app.listen(PORT, () => console.log(`🚀 MULTI robot server on port ${PORT}`));