/*
Copyright 2026 Lotus Guild

SPDX-License-Identifier: AGPL-3.0-only OR LicenseRef-Element-Commercial
Please see LICENSE in the repository root for full details.
*/

import { EventEmitter } from "events";
import { afterEach, beforeEach, expect, test, vi } from "vitest";
import { of } from "rxjs";
import { Track } from "livekit-client";

import { type CallViewModel } from "../state/CallViewModel/CallViewModel";
import { setAudioEnabled$ } from "../controls";
import { startLotusDeafen } from "./lotusDeafen";
import { LotusWidgetActions } from "./lotusActions";

const lazyActions = new EventEmitter();

vi.mock("../widget", () => ({
  widget: {
    api: { transport: { reply: vi.fn().mockResolvedValue(undefined) } },
    // Getter: `vi.mock` factories run at import time, before the const above.
    get lazyActions(): EventEmitter {
      return lazyActions;
    },
  },
}));

/** Minimal CallViewModel stub: no connections, so no livekit rooms. */
function mockVm(participants: unknown[] = []): CallViewModel {
  const livekitRoom = {
    remoteParticipants: new Map(participants.map((p, i) => [String(i), p])),
    on: vi.fn(),
    off: vi.fn(),
  };
  return {
    allConnections$: of({ getConnections: () => [{ livekitRoom }] }),
  } as unknown as CallViewModel;
}

function send(data: unknown): void {
  lazyActions.emit(LotusWidgetActions.SetDeafen, {
    detail: { data },
  });
}

/** Records everything pushed to the global audio-output subject. */
let emissions: boolean[];
let sub: { unsubscribe: () => void };

beforeEach(() => {
  emissions = [];
  sub = setAudioEnabled$.subscribe((v) => emissions.push(v));
});

afterEach(() => {
  sub.unsubscribe();
  lazyActions.removeAllListeners();
});

test("deafen mutes, and undeafen unmutes, EC's global audio output", () => {
  const stop = startLotusDeafen(mockVm());

  send({ deafened: true, screenshareAudioMuted: false });
  expect(emissions).toEqual([false]);

  send({ deafened: false, screenshareAudioMuted: false });
  expect(emissions).toEqual([false, true]);

  stop();
  expect(emissions).toEqual([false, true]);
});

test("re-sending the same state is idempotent (host resendForkState)", () => {
  const stop = startLotusDeafen(mockVm());

  send({ deafened: true, screenshareAudioMuted: false });
  send({ deafened: true, screenshareAudioMuted: false });
  send({ deafened: true, screenshareAudioMuted: false });
  expect(emissions).toEqual([false]);

  stop();
  // Teardown restores the user's own state, which was "audio enabled".
  expect(emissions).toEqual([false, true]);
});

test("undeafen does not re-enable audio the user had muted themselves", () => {
  const stop = startLotusDeafen(mockVm());

  // The user mutes all audio through EC's own control first.
  setAudioEnabled$.next(false);
  expect(emissions).toEqual([false]);

  send({ deafened: true, screenshareAudioMuted: false });
  send({ deafened: false, screenshareAudioMuted: false });
  // Nothing further was pushed: audio was already off and stays off.
  expect(emissions).toEqual([false]);

  stop();
  expect(emissions).toEqual([false]);
});

test("deafen never touches per-participant volume", () => {
  const participant = { setVolume: vi.fn() };
  const stop = startLotusDeafen(mockVm([participant]));

  send({ deafened: true, screenshareAudioMuted: false });
  send({ deafened: false, screenshareAudioMuted: false });
  expect(participant.setVolume).not.toHaveBeenCalled();

  stop();
});

test("screenshare-audio mute is applied per source and only undone for participants we muted", () => {
  const participant = { setVolume: vi.fn() };
  const stop = startLotusDeafen(mockVm([participant]));

  // Not muted yet: no volume writes at all.
  send({ deafened: false, screenshareAudioMuted: false });
  expect(participant.setVolume).not.toHaveBeenCalled();

  send({ deafened: false, screenshareAudioMuted: true });
  expect(participant.setVolume).toHaveBeenCalledWith(
    0,
    Track.Source.ScreenShareAudio,
  );

  participant.setVolume.mockClear();
  send({ deafened: false, screenshareAudioMuted: false });
  expect(participant.setVolume).toHaveBeenCalledWith(
    1,
    Track.Source.ScreenShareAudio,
  );

  // Releasing again writes nothing: we no longer own that participant.
  participant.setVolume.mockClear();
  send({ deafened: false, screenshareAudioMuted: false });
  expect(participant.setVolume).not.toHaveBeenCalled();

  stop();
});

test("a partial payload only moves the flag it names", () => {
  const stop = startLotusDeafen(mockVm());

  send({ deafened: true });
  expect(emissions).toEqual([false]);
  send({ screenshareAudioMuted: true });
  // Still deafened: no change to the global mute.
  expect(emissions).toEqual([false]);

  stop();
});