// worker-multi-estado.js (V11 - FINAL: TRADUCTOR + ANTI-DOBLE EJECUCIÓN)
'use strict';

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

// --- CONFIGURACIÓN ---
const CONFIG = {
  QUEUE_COLLECTION: 'multiasistencia_cambios_estado',
  RESULT_COLLECTION: 'multiasistencia_cambios_estado_log',
  MULTI_LOGIN: "https://web.multiasistencia.com/w3multi/acceso.php",
  MULTI_ACTION_BASE: "https://web.multiasistencia.com/w3multi/fechaccion.php",
  NAV_TIMEOUT: 60000,
  RESCAN_SECONDS: 60
};

// --- DICCIONARIO DE TRADUCCIÓN (APP -> WEB) ---
const STATE_TRANSLATOR = {
    "15": "2",   // App envía "15" -> Robot marca "2" (Visita al Cliente)
    "0": "34",   // Rechazado
    "1": "1",    // Contacto
    "99": "3"    // Entrega presupuesto (ajustar si es necesario)
};

// --- UTILS ---
const sleep = (ms) => new Promise((r) => setTimeout(r, ms));

function toServerTimestamp() {
  return admin.firestore.FieldValue.serverTimestamp();
}

function timeToMultiValue(timeStr) {
    if (!timeStr) return "";
    const [h, m] = timeStr.split(':').map(Number);
    return String((h * 3600) + (m * 60));
}

function extractTimeFromText(text) {
    if (!text) return null;
    const match = text.match(/(\d{1,2}:\d{2})/);
    return match ? match[1] : null;
}

function normalizeDate(dateStr) {
    if (!dateStr) return "";
    if (dateStr.match(/^\d{4}-\d{2}-\d{2}$/)) return dateStr;
    if (dateStr.includes('/')) {
        const [day, month, year] = dateStr.split('/');
        return `${year}-${month}-${day}`;
    }
    return dateStr;
}

function getCurrentDateTime() {
    const now = new Date();
    const year = now.getFullYear();
    const month = String(now.getMonth() + 1).padStart(2, '0');
    const day = String(now.getDate()).padStart(2, '0');
    return { 
        dateStr: `${year}-${month}-${day}`, 
        hourStr: String(now.getHours()), 
        minStr: String(now.getMinutes()).padStart(2, '0') 
    };
}

// --- FIREBASE INIT ---
function initFirebase() {
  if (!process.env.FIREBASE_PRIVATE_KEY) throw new Error('Missing 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'),
      }),
    });
  }
  return admin.firestore();
}

// --- LOGIN ---
async function loginMulti(page, db) {
  let user = "", pass = "";
  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.");
  
  console.log('🔐 Login en Multiasistencia...');
  await page.goto(CONFIG.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);
}

// --- PLAYWRIGHT SETUP ---
async function withBrowser(fn) {
  const browser = await chromium.launch({ headless: true, args: ['--no-sandbox'] });
  const context = await browser.newContext();
  const page = await context.newPage();
  try { return await fn(page); } finally { await browser.close().catch(() => {}); }
}

async function forceUpdate(elementHandle) {
    if (elementHandle) {
        await elementHandle.evaluate(el => {
            el.dispatchEvent(new Event('input', { bubbles: true }));
            el.dispatchEvent(new Event('change', { bubbles: true }));
            el.dispatchEvent(new Event('blur', { bubbles: true }));
        });
    }
}

// --- LÓGICA PRINCIPAL ---
async function processChangeState(page, db, jobData) {
    const serviceNumber = jobData.serviceNumber;
    
    // MAPPING
    let rawReason = jobData.reasonValue || jobData.nuevoEstado || jobData.estado; 
    const comment = jobData.comment || jobData.observaciones || jobData.nota;
    const rawDate = jobData.dateStr || jobData.fecha;
    const dateStr = normalizeDate(rawDate);
    let timeStr = jobData.timeStr || extractTimeFromText(comment);
    
    // TRADUCCIÓN
    const reasonValue = STATE_TRANSLATOR[rawReason] || rawReason;

    console.log(`🔧 DATOS: App envía "${rawReason}" -> Traducido a ID "${reasonValue}"`);

    if (!reasonValue || reasonValue === 'undefined') throw new Error("DATOS FALTANTES: No hay estado válido.");

    // NAVEGACIÓN
    await loginMulti(page, db);
    const targetUrl = `${CONFIG.MULTI_ACTION_BASE}?reparacion=${serviceNumber}&modo=0&navid=%2Fw3multi%2Ffrepasos_new.php%FDGET%FDrefresh%3D1%FC`;
    console.log(`📂 Abriendo servicio ${serviceNumber}...`);
    await page.goto(targetUrl, { waitUntil: 'domcontentloaded', timeout: 60000 });
    
    await page.waitForSelector('select.answer-select', { timeout: 20000 });
    await page.waitForTimeout(1500); 

    // MOTIVO
    const reasonSel = page.locator('select.answer-select').first();
    const targetValue = String(reasonValue);
    
    // Check de seguridad
    const availableOptions = await reasonSel.evaluate((select) => 
        Array.from(select.options).map(o => ({ value: o.value, text: o.innerText.trim() }))
    );
    
    if (!availableOptions.find(o => o.value === targetValue)) {
        const validList = availableOptions.map(o => `[${o.value}: ${o.text}]`).join(', ');
        throw new Error(`MOTIVO INVÁLIDO: ID "${targetValue}" no existe. Opciones: ${validList}`);
    }

    await reasonSel.selectOption(targetValue);
    await forceUpdate(await reasonSel.elementHandle());

    // COMENTARIO
    if (comment) {
        const commentBox = page.locator('textarea[formcontrolname="comment"]');
        await commentBox.fill(comment);
        await forceUpdate(await commentBox.elementHandle());
    }

    // FECHA SIGUIENTE ACCIÓN
    if (dateStr) {
        const actionBlock = page.locator('encastrables-date-hour-field[label="TXTFACCION"]');
        if (await actionBlock.count() > 0) {
            const dateInput = actionBlock.locator('input[type="date"]');
            await dateInput.fill(dateStr);
            await forceUpdate(await dateInput.elementHandle());
            await page.click('body'); 
            
            if (timeStr) {
                const secondsValue = timeToMultiValue(timeStr);
                const timeSelect = actionBlock.locator('select.answer-select');
                await timeSelect.selectOption(secondsValue).catch(() => {});
                await forceUpdate(await timeSelect.elementHandle());
            }
        } else {
            const genericDateInput = page.locator('input[type="date"]').first();
            await genericDateInput.fill(dateStr);
            await forceUpdate(await genericDateInput.elementHandle());
        }
    }

    // FECHA CONTACTO (AUTOMÁTICA)
    const contactBlock = page.locator('encastrables-date-hour-field[label="TXTFCONTACTO"]');
    if (await contactBlock.count() > 0 && await contactBlock.isVisible()) {
        console.log('📞 Rellenando contacto con FECHA ACTUAL...');
        const now = getCurrentDateTime(); 
        const contactDateInput = contactBlock.locator('input[type="date"]');
        await contactDateInput.fill(now.dateStr);
        await forceUpdate(await contactDateInput.elementHandle());

        const selects = contactBlock.locator('select.answer-select-time');
        if (await selects.count() >= 2) {
            await selects.nth(0).selectOption(now.hourStr).catch(() => {});
            await forceUpdate(await selects.nth(0).elementHandle());
            await selects.nth(1).selectOption(now.minStr).catch(() => {});
            await forceUpdate(await selects.nth(1).elementHandle());
        }
    }

    await page.waitForTimeout(2000);

    // GUARDAR
    const btn = page.locator('button.form-container-button-submit');
    if (await btn.isDisabled()) {
        await page.click('textarea[formcontrolname="comment"]');
        await page.keyboard.press('Tab');
        await page.waitForTimeout(1000);
        if (await btn.isDisabled()) throw new Error(`IMPOSIBLE GUARDAR: Bloqueado.`);
    }
    console.log('💾 Guardando...');
    await btn.click();
    
    // ALERTAS SMS
    await page.waitForTimeout(3000);
    const confirmBtn = page.locator('button.form-container-button-submit-toast').filter({ hasText: 'Sí' });
    if (await confirmBtn.count() > 0 && await confirmBtn.isVisible()) {
        await confirmBtn.click();
        await page.waitForTimeout(3000); 
    }

    // RESULTADO
    const screenshotBuffer = await page.screenshot({ fullPage: true, quality: 50, type: 'jpeg' });
    const screenshotBase64 = screenshotBuffer.toString('base64');
    const finalResult = await page.evaluate(() => {
        const successEl = document.querySelector('.form-container-success') || document.querySelector('.bg-success');
        const errorEl = document.querySelector('.form-container-error') || document.querySelector('.bg-danger');
        if (successEl) return { type: 'OK', text: successEl.innerText };
        if (errorEl) return { type: 'ERROR', text: errorEl.innerText };
        return { type: 'UNKNOWN', text: document.body.innerText.substring(0, 300) };
    });

    console.log(`🏁 FINAL: ${finalResult.type}`);
    return { success: (finalResult.type === 'OK' || finalResult.text.includes('correctamente')), message: finalResult.text, screenshot: screenshotBase64 };
}

// --- GESTIÓN DE COLAS Y TRANSACCIONES ---
async function claimJobById(db, jobId) {
    const ref = db.collection(CONFIG.QUEUE_COLLECTION).doc(jobId);
    return await db.runTransaction(async (tx) => {
      const snap = await tx.get(ref);
      // VALIDACIÓN CRÍTICA: Si ya no es PENDING, devolvemos null
      if (!snap.exists || snap.data().status !== 'PENDING') return null;
      
      tx.set(ref, { status: 'RUNNING', claimedAt: toServerTimestamp() }, { merge: true });
      return { id: jobId, ...snap.data() };
    });
}

async function markJobDone(db, job, result) {
    const jobId = job.id;
    await db.collection(CONFIG.QUEUE_COLLECTION).doc(jobId).set({ status: 'DONE', result }, { merge: true });
    await db.collection(CONFIG.RESULT_COLLECTION).add({ 
        jobId, 
        ok: true, 
        serviceNumber: job.serviceNumber || '',
        reason: job.nuevoEstado || job.estado || '', 
        comment: job.observaciones || job.nota || '',
        ...result, 
        createdAt: toServerTimestamp() 
    });
}

async function markJobFailed(db, job, err) {
    const jobId = job.id;
    await db.collection(CONFIG.QUEUE_COLLECTION).doc(jobId).set({ status: 'FAILED', error: { message: err.message } }, { merge: true });
    await db.collection(CONFIG.RESULT_COLLECTION).add({ 
        jobId, ok: false, serviceNumber: job.serviceNumber || '', error: err.message, createdAt: toServerTimestamp() 
    });
}

async function processJob(db, job) {
  // CRÍTICO: Si el trabajo llegó nulo (porque otro proceso lo robó antes), salimos silenciosamente
  if (!job) {
      console.log('⚠️ Aviso: Trabajo duplicado detectado y evitado (Transacción retornó null).');
      return;
  }
  
  console.log(`>>> Procesando Job: ${job.id}`);
  try {
    await withBrowser(async (page) => {
      const res = await processChangeState(page, db, job);
      await markJobDone(db, job, res);
      console.log(`✅ Job ${job.id} Completado.`);
    });
  } catch (err) {
    console.error(`❌ Job ${job.id} Falló:`, err.message);
    await markJobFailed(db, job, err);
  }
}

// --- LOOP PRINCIPAL MEJORADO ---
function startWorker(db) {
  const queue = [];
  const processingIds = new Set(); // 🔒 EVITAR DUPLICADOS EN MEMORIA
  let isRunning = false; // 🔒 SEMÁFORO DE EJECUCIÓN

  const run = async () => { 
      if (isRunning) return; // Si ya estoy corriendo, no me interrumpas
      isRunning = true;

      while(queue.length) { 
          const jobId = queue.shift();
          
          // 🔒 DOBLE SEGURIDAD: Si ya lo estoy procesando, salto
          if (processingIds.has(jobId)) continue;
          processingIds.add(jobId);

          try {
            const jobData = await claimJobById(db, jobId);
            await processJob(db, jobData);
          } finally {
            processingIds.delete(jobId); // Libero el ID al terminar
          }
      } 
      isRunning = false;
  };
  
  db.collection(CONFIG.QUEUE_COLLECTION).where('status', '==', 'PENDING').onSnapshot(s => {
      let hasNews = false;
      s.docChanges().forEach(c => { 
          // Solo añadimos si es nuevo Y no lo tenemos ya en cola ni procesando
          if(c.type === 'added' && !queue.includes(c.doc.id) && !processingIds.has(c.doc.id)) { 
              queue.push(c.doc.id); 
              hasNews = true;
          } 
      });
      if (hasNews) run();
  });
  
  console.log('🚀 Worker Multiasistencia (V11 - FINAL SEGURO) LISTO.');
}

const db = initFirebase();
startWorker(db);