import net from "node:net";

const MIN_NODE = [22, 5, 0];
const actualNode = process.versions.node.split(".").map(Number);
const isVersionAtLeast = actualNode[0] > MIN_NODE[0]
  || actualNode[0] === MIN_NODE[0] && (actualNode[1] > MIN_NODE[1]
    || actualNode[1] === MIN_NODE[1] && actualNode[2] >= MIN_NODE[2]);

if (!isVersionAtLeast) {
  console.error(`AgendaPro requiere Node.js >= ${MIN_NODE.join(".")}; detectado ${process.version}.`);
  process.exit(1);
}

try {
  await import("node:sqlite");
} catch (error) {
  console.error("La instalación de Node no incluye node:sqlite, requerido por AgendaPro.");
  console.error(error);
  process.exit(1);
}

const portsArg = process.argv.find((arg) => arg.startsWith("--ports="))?.split("=", 2)[1];
const configuredPorts = portsArg ? portsArg.split(",").map(Number).filter(Boolean) : [];
const ports = configuredPorts.map((port, index) => {
  if (index === 0 && process.env.PORT) return Number(process.env.PORT) || port;
  if (index === 1 && process.env.VITE_PORT) return Number(process.env.VITE_PORT) || port;
  return port;
});

function isPortBusy(port) {
  return new Promise((resolve) => {
    const socket = net.createConnection({ host: "127.0.0.1", port });
    let settled = false;
    const finish = (busy) => {
      if (settled) return;
      settled = true;
      socket.destroy();
      resolve(busy);
    };
    socket.once("connect", () => finish(true));
    socket.once("error", () => finish(false));
    socket.setTimeout(500, () => finish(false));
  });
}

const busyPorts = [];
for (const port of ports) {
  if (await isPortBusy(port)) busyPorts.push(port);
}

if (busyPorts.length) {
  console.error(`No se puede iniciar AgendaPro: los puertos ${busyPorts.join(", ")} ya están ocupados.`);
  console.error("Cierra el proceso anterior o cambia PORT/VITE_PORT; en Windows puedes localizarlo con: netstat -ano | findstr :<puerto>");
  process.exit(1);
}

console.log(`Preflight OK: Node ${process.version}${ports.length ? `; puertos ${ports.join(", ")} disponibles` : ""}.`);