/**
 * Kill whatever is listening on the Descrybe dev ports so `npm run dev` can bind.
 * Skip when DESCRYBE_DEV_PORTS_FREED=1 (parent already freed; children must not
 * re-kill the just-started sibling).
 *
 * Usage: node scripts/free-dev-ports.mjs
 */
import { spawnSync } from "node:child_process";
import { pathToFileURL } from "node:url";
import { DEV_API_PORT, DEV_WEB_PORT } from "./dev-ports.mjs";

export function freeDevPorts(ports = [DEV_API_PORT, DEV_WEB_PORT]) {
  if (process.env.DESCRYBE_DEV_PORTS_FREED === "1") {
    return;
  }

  for (const port of ports) {
    const pids = listenersOnPort(port);
    if (pids.length === 0) {
      console.log(`[dev-ports] ${port} free`);
      continue;
    }
    for (const pid of pids) {
      console.log(`[dev-ports] killing PID ${pid} on :${port}`);
      killPidTree(pid);
    }
  }
}

function listenersOnPort(port) {
  if (process.platform === "win32") {
    const ps = [
      `$conns = @(Get-NetTCPConnection -LocalPort ${port} -State Listen -ErrorAction SilentlyContinue);`,
      `if ($conns.Count -eq 0) { exit 0 };`,
      `$conns | ForEach-Object { $_.OwningProcess } | Sort-Object -Unique | ForEach-Object { Write-Output $_ }`,
    ].join(" ");
    const r = spawnSync(
      "powershell.exe",
      ["-NoProfile", "-NonInteractive", "-Command", ps],
      { encoding: "utf8" },
    );
    return parsePids(r.stdout || "");
  }

  const r = spawnSync("lsof", ["-tiTCP:" + port, "-sTCP:LISTEN"], {
    encoding: "utf8",
  });
  if (r.status !== 0) return [];
  return parsePids(r.stdout || "");
}

function parsePids(text) {
  const seen = new Set();
  const out = [];
  for (const raw of text.split(/\r?\n/)) {
    const n = Number.parseInt(raw.trim(), 10);
    if (!Number.isFinite(n) || n <= 0 || seen.has(n)) continue;
    if (n === process.pid) continue;
    seen.add(n);
    out.push(n);
  }
  return out;
}

function killPidTree(pid) {
  if (process.platform === "win32") {
    spawnSync("taskkill.exe", ["/T", "/F", "/PID", String(pid)], {
      stdio: "ignore",
    });
    return;
  }
  try {
    process.kill(pid, "SIGKILL");
  } catch {
    /* already gone */
  }
}

const isDirect =
  process.argv[1] &&
  import.meta.url === pathToFileURL(process.argv[1]).href;

if (isDirect) {
  freeDevPorts();
}