import { describe, it, expect, beforeEach, vi } from "vitest";
import { setBackgroundAudioEnabled } from "./backgroundAudio";

/**
 * Bridge-reporting contract for the background-audio toggle.
 *
 * TRACES: UR-040 | IR-025, DR-051 | UT-062
 *
 * Regression guard for the "screen lock kills video audio" bug: MainActivity
 * re-ran configureWebViewForMedia() on every onResume, re-calling
 * addJavascriptInterface over a live page. WebView then served a stale proxy —
 * `window.AndroidBackgroundAudio` stayed truthy but its methods were gone, so
 * `setEnabled` threw `TypeError: e.setEnabled is not a function`.
 *
 * The old implementation swallowed that with `bridge()?.setEnabled(...)` inside
 * a try/catch returning void, so the UI showed "armed" while native never got
 * the flag — and onStop's `if (backgroundAudioEnabled)` guard never dispatched
 * `jellytau-background`. Audio died the instant the screen locked.
 *
 * setBackgroundAudioEnabled must therefore REPORT whether native was actually
 * reached, so a dead bridge can never masquerade as an armed toggle.
 */
describe("setBackgroundAudioEnabled", () => {
  beforeEach(() => {
    delete (window as unknown as Record<string, unknown>).AndroidBackgroundAudio;
    vi.restoreAllMocks();
  });

  it("reports success when the bridge is present and the call lands", () => {
    const setEnabled = vi.fn();
    window.AndroidBackgroundAudio = { setEnabled };

    expect(setBackgroundAudioEnabled(true)).toBe(true);
    expect(setEnabled).toHaveBeenCalledWith(true);
  });

  it("reports failure when the bridge object is absent entirely", () => {
    expect(setBackgroundAudioEnabled(true)).toBe(false);
  });

  it("reports failure for a stale proxy whose methods are gone", () => {
    // The exact shape of the bug: object present (so `?.` passes) but the
    // method is missing after re-injection over a live page.
    window.AndroidBackgroundAudio = {} as unknown as typeof window.AndroidBackgroundAudio;

    expect(setBackgroundAudioEnabled(true)).toBe(false);
  });

  it("reports failure when the bridge method throws", () => {
    window.AndroidBackgroundAudio = {
      setEnabled: () => {
        throw new TypeError("e.setEnabled is not a function");
      },
    };

    expect(setBackgroundAudioEnabled(true)).toBe(false);
  });

  it("never throws out to the caller — the toggle must not break the player", () => {
    window.AndroidBackgroundAudio = {
      setEnabled: () => {
        throw new Error("boom");
      },
    };

    expect(() => setBackgroundAudioEnabled(false)).not.toThrow();
  });
});