// Ask real Node whether an open stdin holds each guest in tests/fixtures/stdin-liveness.mjs:
// `node scripts/stdin-liveness.mjs` prints one JSON line per case, the literal
// tests/stdin.spec.ts expects.
import { spawn } from "node:child_process";
import { BIG_INPUT_BYTES, CLOSE_AFTER_MS, INPUT, LIVENESS_CASES } from "../tests/fixtures/stdin-liveness.mjs";
import { assertPinnedNode, oracleEnv } from "./pinned-node.mjs";

assertPinnedNode();

for (const [name, source] of Object.entries(LIVENESS_CASES)) {
  const child = spawn(process.execPath, ["-e", source], { stdio: ["pipe", "pipe", "inherit"], env: oracleEnv() });
  let stdout = "";
  let closed = false;
  let timer;
  child.stdout.on("data", (d) => {
    stdout += d;
    timer ??= setTimeout(() => {
      closed = true;
      child.stdin.end();
    }, CLOSE_AFTER_MS);
  });
  child.stdin.on("error", () => {}); // a child that exits early makes the big write EPIPE
  child.stdin.write(name === "fullBuffer" ? "x".repeat(BIG_INPUT_BYTES) : INPUT);
  const code = await new Promise((resolve) => child.on("exit", resolve));
  clearTimeout(timer);
  console.log(JSON.stringify({ name, held: closed, code, stdout }));
}