import { afterEach, describe, expect, it, vi } from "vitest";

// Reader health: push-only QR readers expose no TCP port, so liveness is an ICMP
// ping of the (optional) configured IP. With no IP we must NOT claim "ready" (the old
// stub did, hiding offline readers behind a green dot) — we report degraded instead.
// icmpPing is mocked so the test is deterministic + offline.

const icmpPing = vi.fn<(host: string, timeoutMs?: number) => Promise<boolean>>();
vi.mock("./icmp.js", () => ({ icmpPing: (...a: [string, number?]) => icmpPing(...a) }));

const { geeQrReaderDriver } = await import("./reader.js");

afterEach(() => {
  icmpPing.mockReset();
});

describe("QR reader healthCheck (ICMP liveness)", () => {
  it("with an IP that replies → ready", async () => {
    icmpPing.mockResolvedValue(true);
    const r = geeQrReaderDriver.create({ serial: "H05M2AFA", host: "10.0.10.7" });
    expect(await r.healthCheck()).toEqual({ status: "ready", detail: "ping 10.0.10.7" });
    expect(icmpPing).toHaveBeenCalledWith("10.0.10.7");
  });

  it("with an IP that does NOT reply → offline (this is the bug fix)", async () => {
    icmpPing.mockResolvedValue(false);
    const r = geeQrReaderDriver.create({ serial: "H05M2AFA", host: "10.0.10.7" });
    expect(await r.healthCheck()).toEqual({ status: "offline", detail: "no ping reply from 10.0.10.7" });
  });

  it("with NO IP → degraded (never a false 'ready')", async () => {
    const r = geeQrReaderDriver.create({ serial: "H05M2AFA" });
    const h = await r.healthCheck();
    expect(h.status).toBe("degraded");
    expect(icmpPing).not.toHaveBeenCalled(); // nothing to ping
  });

  it("exposes an optional host field for monitoring", () => {
    const hostField = geeQrReaderDriver.configFields.find((f) => f.key === "host");
    expect(hostField).toBeDefined();
    expect(hostField!.required).toBe(false); // operation is push-by-serial; IP is monitor-only
  });
});