import { readFileSync } from "node:fs";

export function testProcessIsAlive(pid: number): boolean {
  if (process.platform === "linux") {
    try {
      const stat = readFileSync(`/proc/${pid}/stat`, "utf8");
      const state = stat.slice(stat.lastIndexOf(") ") + 2)[0];
      return state !== "Z" && state !== "X";
    } catch {
      return false;
    }
  }
  try {
    process.kill(pid, 0);
    return true;
  } catch {
    return false;
  }
}

export async function waitForTestCondition(check: () => boolean, timeoutMs: number): Promise<void> {
  const deadline = Date.now() + timeoutMs;
  while (!check()) {
    if (Date.now() >= deadline) throw new Error(`Condition not met within ${timeoutMs} ms`);
    await new Promise((resolve) => setTimeout(resolve, 20));
  }
}