import { describe, it, expect } from "vitest";
import { exec as rawExec } from "../src/utils/agent/sandbox/raw-exec.js";

// Regression test: When cancelling an in‑flight `rawExec()` the implementation
// must terminate *all* processes that belong to the spawned command – not just
// the direct child.  The original logic only sent `SIGTERM` to the immediate
// child which meant that grandchildren (for instance when running through a
// `bash -c` wrapper) were left running and turned into "zombie" processes.

// Strategy:
//   1. Start a Bash shell that spawns a long‑running `sleep`, prints the PID
//      of that `sleep`, and then waits forever.  This guarantees we can later
//      check if the grand‑child is still alive.
//   2. Abort the exec almost immediately.
//   3. After `rawExec()` resolves we probe the previously printed PID with
//      `process.kill(pid, 0)`.  If the call throws `ESRCH` the process no
//      longer exists – the desired outcome.  Otherwise the test fails.

// The negative‑PID process‑group trick employed by the fixed implementation is
// POSIX‑only.  On Windows we skip the test.

describe("rawExec – abort kills entire process group", () => {
  it("terminates grandchildren spawned via bash", async () => {
    if (process.platform === "win32") {
      return;
    }

    const abortController = new AbortController();

    // Bash script: spawn `sleep 30` in background, print its PID, then wait.
    const script = "sleep 30 & pid=$!; echo $pid; wait $pid";
    const cmd = ["bash", "-c", script];

    // Kick off the command.
    const execPromise = rawExec(cmd, {}, [], abortController.signal);

    // Give Bash a tiny bit of time to start and print the PID.
    await new Promise((r) => setTimeout(r, 50));

    // Cancel the task – this should kill *both* bash and the inner sleep.
    abortController.abort();

    const { exitCode, stdout } = await execPromise;

    // We expect a non‑zero exit code because the process was killed.
    expect(exitCode).not.toBe(0);

    // Extract the grand‑child PID from stdout.
    const pidMatch = /^(\d+)/.exec(stdout.trim());
    expect(pidMatch).not.toBeNull();
    const sleepPid = Number(pidMatch![1]);

    // Verify that the sleep process is no longer alive.
    let alive = true;
    try {
      process.kill(sleepPid, 0); // throws if the process does not exist
      alive = true;
    } catch {
      alive = false;
    }

    expect(alive).toBe(false);
  });
});
