server.js

import express from "express";
import puppeteer from "puppeteer-core";
import chromium from "@sparticuz/chromium";

const app = express();
app.use(express.json({ limit: "20mb" }));

// ✅ Ruta base (ya la tenías)
app.get("/", (req, res) => {
  res.send("HTML → PDF service is running");
});

// ✅ NUEVO: endpoint liviano para despertar Render
app.get("/ping", (_req, res) => {
  res.status(200).send("ok");
});

// 🔥 Endpoint pesado (PDF)
app.post("/render-pdf", async (req, res) => {
  try {
    const { html } = req.body;

    if (!html) {
      return res.status(400).json({ error: "HTML requerido" });
    }

    const browser = await puppeteer.launch({
      args: chromium.args,
      executablePath: await chromium.executablePath(),
      headless: chromium.headless,
      timeout: 60000,
    });

    const page = await browser.newPage();

    await page.setContent(html, {
      waitUntil: "networkidle0",
      timeout: 60000,
    });

    const pdfBuffer = await page.pdf({
      format: "A4",
      printBackground: true,
      margin: {
        top: "8mm",
        right: "10mm",
        bottom: "15mm",
        left: "10mm",
      },
    });

    await browser.close();

    res.json({
      pdf_base64: pdfBuffer.toString("base64"),
    });
  } catch (error) {
    console.error("ERROR PDF:", error);
    res.status(500).json({
      error: "Error generando PDF",
      detail: error.message,
    });
  }
});

const PORT = process.env.PORT || 10000;
app.listen(PORT, () => {
  console.log("HTML → PDF renderer activo en puerto", PORT);
});