// estados-homeserve/index.js
'use strict';


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

function mustEnv(name) {
  const v = process.env[name];
  if (!v) throw new Error(`Missing env: ${name}`);
  return v;
}

function initFirebase() {
  if (!process.env.FIREBASE_PRIVATE_KEY) throw new Error('Missing env: FIREBASE_PRIVATE_KEY');
  if (!admin.apps.length) {
    admin.initializeApp({
      credential: admin.credential.cert({
        projectId: mustEnv('FIREBASE_PROJECT_ID'),
        clientEmail: mustEnv('FIREBASE_CLIENT_EMAIL'),
        privateKey: mustEnv('FIREBASE_PRIVATE_KEY').replace(/\\n/g, '\n'),
      }),
    });
  }
  return admin.firestore();
}

const CONFIG = {
  HOMESERVE_BASE_URL: process.env.HOMESERVE_BASE_URL || 'https://gestor.homeserve.es/',
  HOMESERVE_USER: mustEnv('HOMESERVE_USER'),
  HOMESERVE_PASS: mustEnv('HOMESERVE_PASS'),

  QUEUE_COLLECTION: process.env.QUEUE_COLLECTION || 'homeserve_cambios_estado',
  RESULT_COLLECTION: process.env.RESULT_COLLECTION || 'homeserve_cambios_estado_log',

  // TTL de claim (si un worker muere, otro puede reintentar)
  CLAIM_TTL_MINUTES: parseInt(process.env.CLAIM_TTL_MINUTES || '10', 10),

  // rescaneo por si un listener se pierde un evento (seguridad)
  RESCAN_SECONDS: parseInt(process.env.RESCAN_SECONDS || '60', 10),

  SEL: {
    user: process.env.SEL_USER || 'input[type="text"]',
    pass: process.env.SEL_PASS || 'input[type="password"]',
    submit: process.env.SEL_SUBMIT || 'button[type="submit"]',

    searchBox: process.env.SEL_SEARCH_BOX || 'input[placeholder*="Buscar"], input[type="search"]',
    searchBtn: process.env.SEL_SEARCH_BTN || 'button:has-text("Buscar"), button:has-text("Search")',

    openRow: process.env.SEL_OPEN_ROW || 'table tbody tr:first-child',

    statusDropdown: process.env.SEL_STATUS_DROPDOWN || 'select[name*="estado"], select[id*="estado"], select:has(option)',
    noteTextarea: process.env.SEL_NOTE_TEXTAREA || 'textarea[name*="nota"], textarea[id*="nota"], textarea',
    saveBtn: process.env.SEL_SAVE_BTN || 'button:has-text("Guardar"), button:has-text("Save"), button:has-text("Actualizar")',
  },
};

const STATE_MAP = {
  EN_RUTA: ['De camino', 'En ruta', 'En camino'],
  EN_CURSO: ['En curso', 'Trabajando', 'En intervención'],
  FINALIZADO: ['Finalizado', 'Finalizada', 'Terminado'],
  NO_LOCALIZADO: ['No localizado', 'No localizable', 'Ausente'],
  CERRADO: ['Cerrado', 'Cierre', 'Cerrada'],
  ANULADO: ['Anulado', 'Cancelado', 'Cancelada'],
};

const sleep = (ms) => new Promise((r) => setTimeout(r, ms));
function nowMs() { return Date.now(); }
function toServerTimestamp() { return admin.firestore.FieldValue.serverTimestamp(); }

function isPendingStatus(st) {
  return st === undefined || st === null || st === 'PENDING';
}

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

async function login(page) {
  await page.goto(CONFIG.HOMESERVE_BASE_URL, { waitUntil: 'domcontentloaded', timeout: 120000 });
  await page.waitForSelector(CONFIG.SEL.user, { timeout: 60000 });
  await page.fill(CONFIG.SEL.user, CONFIG.HOMESERVE_USER);

  await page.waitForSelector(CONFIG.SEL.pass, { timeout: 60000 });
  await page.fill(CONFIG.SEL.pass, CONFIG.HOMESERVE_PASS);

  const btn = await page.$(CONFIG.SEL.submit);
  if (btn) await btn.click();
  else await page.keyboard.press('Enter');

  await page.waitForLoadState('networkidle', { timeout: 120000 });
}

async function openParte(page, parteId) {
  const hasSearch = await page.$(CONFIG.SEL.searchBox);
  if (hasSearch) {
    await page.fill(CONFIG.SEL.searchBox, String(parteId));
    const btn = await page.$(CONFIG.SEL.searchBtn);
    if (btn) await btn.click();
    else await page.keyboard.press('Enter');
    await page.waitForLoadState('networkidle', { timeout: 120000 });
    await sleep(1500);
  }

  await page.waitForSelector(CONFIG.SEL.openRow, { timeout: 60000 });
  await page.click(CONFIG.SEL.openRow);
  await page.waitForLoadState('networkidle', { timeout: 120000 });
  await sleep(1200);
}

async function setEstado(page, nuevoEstado, nota) {
  const candidates = STATE_MAP[nuevoEstado] || [nuevoEstado];

  await page.waitForSelector(CONFIG.SEL.statusDropdown, { timeout: 60000 });

  let selected = false;
  for (const label of candidates) {
    try {
      await page.selectOption(CONFIG.SEL.statusDropdown, { label });
      selected = true;
      break;
    } catch (_) {}
  }

  if (!selected) {
    const ok = await page.evaluate(({ sel, candidates }) => {
      const s = document.querySelector(sel);
      if (!s) return false;
      const opts = Array.from(s.querySelectorAll('option'));
      const hit = opts.find(o =>
        candidates.some(c => (o.textContent || '').trim().toLowerCase() === c.trim().toLowerCase())
      );
      if (!hit) return false;
      s.value = hit.value;
      s.dispatchEvent(new Event('change', { bubbles: true }));
      return true;
    }, { sel: CONFIG.SEL.statusDropdown, candidates });
    if (!ok) throw new Error(`No matching status option for "${nuevoEstado}"`);
  }

  if (nota) {
    const ta = await page.$(CONFIG.SEL.noteTextarea);
    if (ta) await page.fill(CONFIG.SEL.noteTextarea, String(nota));
  }

  const save = await page.$(CONFIG.SEL.saveBtn);
  if (!save) throw new Error('Save button not found');
  await save.click();
  await page.waitForLoadState('networkidle', { timeout: 120000 });
  await sleep(1500);
}

// Claim por ID (mantiene la “seguridad” si hay 2 robots)
async function claimJobById(db, jobId) {
  const now = nowMs();
  const ttlMs = CONFIG.CLAIM_TTL_MINUTES * 60 * 1000;
  const ref = db.collection(CONFIG.QUEUE_COLLECTION).doc(jobId);

  const res = await db.runTransaction(async (tx) => {
    const snap = await tx.get(ref);
    if (!snap.exists) return null;

    const d = snap.data() || {};
    const st = d.status ?? 'PENDING';

    const claimedAt = d.claimedAt?.toMillis ? d.claimedAt.toMillis() : null;
    const isStale = claimedAt && (now - claimedAt > ttlMs);

    if (st === 'DONE') return null;
    if (st === 'RUNNING' && !isStale) return null;

    if (!isPendingStatus(st) && st !== 'FAILED' && !(st === 'RUNNING' && isStale)) {
      // Si alguien mete estados raros, lo ignoramos
      return null;
    }

    tx.set(ref, {
      status: 'RUNNING',
      claimedAt: toServerTimestamp(),
      claimedBy: process.env.HOSTNAME || 'estados-homeserve',
      lastSeenAt: toServerTimestamp(),
    }, { merge: true });

    return { id: jobId, ...d };
  });

  return res;
}

async function markDone(db, jobId, result) {
  const ref = db.collection(CONFIG.QUEUE_COLLECTION).doc(jobId);
  await ref.set({
    status: 'DONE',
    finishedAt: toServerTimestamp(),
    result,
    lastSeenAt: toServerTimestamp(),
  }, { merge: true });

  await db.collection(CONFIG.RESULT_COLLECTION).add({
    jobId,
    ...result,
    createdAt: toServerTimestamp(),
  });
}

async function markFailed(db, jobId, err) {
  const ref = db.collection(CONFIG.QUEUE_COLLECTION).doc(jobId);
  await ref.set({
    status: 'FAILED',
    finishedAt: toServerTimestamp(),
    error: {
      message: String(err?.message || err),
      stack: String(err?.stack || ''),
    },
    lastSeenAt: toServerTimestamp(),
  }, { merge: true });

  await db.collection(CONFIG.RESULT_COLLECTION).add({
    jobId,
    ok: false,
    error: {
      message: String(err?.message || err),
      stack: String(err?.stack || ''),
    },
    createdAt: toServerTimestamp(),
  });
}

async function processJob(db, job) {
  const jobId = job.id;
  const parteId = job.parteId || job.parte || job.codigo || job.serviceId;
  const nuevoEstado = job.nuevoEstado || job.estado || job.statusTo;
  const nota = job.nota || job.note || '';

  if (!parteId || !nuevoEstado) {
    await markFailed(db, jobId, new Error('Job missing parteId or nuevoEstado'));
    return;
  }

  try {
    const started = new Date().toISOString();

    await withBrowser(async (page) => {
      await login(page);
      await openParte(page, parteId);
      await setEstado(page, nuevoEstado, nota);
    });

    await markDone(db, jobId, {
      ok: true,
      startedAtISO: started,
      parteId: String(parteId),
      nuevoEstado: String(nuevoEstado),
      nota: String(nota || ''),
    });
  } catch (err) {
    await markFailed(db, jobId, err);
  }
}

/**
 * Modo reactivo:
 * - Listener Firestore detecta jobs PENDING y los mete en cola interna
 * - Procesamos de uno en uno (Playwright mejor así)
 */
function createWorker(db) {
  const queue = [];
  const queued = new Set();
  let running = false;

  async function drain() {
    if (running) return;
    running = true;
    try {
      while (queue.length) {
        const id = queue.shift();
        queued.delete(id);

        const claimed = await claimJobById(db, id);
        if (!claimed) continue; // otro worker lo pilló o ya no aplica

        await processJob(db, claimed);
      }
    } finally {
      running = false;
    }
  }

  function enqueue(id) {
    if (queued.has(id)) return;
    queued.add(id);
    queue.push(id);
    // Arranca al momento, sin esperar
    drain().catch(console.error);
  }

  async function rescanPending() {
    try {
      const snap = await db.collection(CONFIG.QUEUE_COLLECTION)
        .orderBy('createdAt', 'asc')
        .limit(50)
        .get();

      snap.forEach((doc) => {
        const d = doc.data() || {};
        if (isPendingStatus(d.status)) enqueue(doc.id);
      });
    } catch (e) {
      console.error('Rescan error:', e);
    }
  }

  function startListener() {
    // Listener general (evita problemas de query con null en "in")
    return db.collection(CONFIG.QUEUE_COLLECTION)
      .orderBy('createdAt', 'asc')
      .limit(50)
      .onSnapshot((snap) => {
        for (const ch of snap.docChanges()) {
          if (ch.type !== 'added' && ch.type !== 'modified') continue;
          const d = ch.doc.data() || {};
          if (isPendingStatus(d.status)) enqueue(ch.doc.id);
        }
      }, (err) => {
        console.error('onSnapshot error:', err);
      });
  }

  return { startListener, rescanPending };
}

async function main() {
  const db = initFirebase();

  const worker = createWorker(db);
  const unsubscribe = worker.startListener();

  // rescaneo “por si acaso”
  await worker.rescanPending();
  setInterval(() => worker.rescanPending(), CONFIG.RESCAN_SECONDS * 1000);

  // no salimos nunca (servicio)
  process.on('SIGINT', () => {
    try { unsubscribe && unsubscribe(); } catch (_) {}
    process.exit(0);
  });
  process.on('SIGTERM', () => {
    try { unsubscribe && unsubscribe(); } catch (_) {}
    process.exit(0);
  });

  console.log('✅ estados-homeserve listo (modo reactivo, sin polling).');
}

main().catch((e) => {
  console.error(e);
  process.exit(1);
});