/*
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 { afterEach, beforeEach, describe, expect, test, vi } from "vitest";
import { Room as LivekitRoom } from "livekit-client";
import { BehaviorSubject } from "rxjs";
import { logger } from "matrix-js-sdk/lib/logger";
import EventEmitter from "events";

import { ObservableScope } from "../state/ObservableScope.ts";
import { ECConnectionFactory } from "../state/CallViewModel/remoteMembers/ConnectionFactory.ts";
import type { OpenIDClientParts } from "../livekit/openIDSFU.ts";
import {
  exampleTransport,
  mockMediaDevices,
  ownMemberMock,
} from "../utils/test.ts";
import type { ProcessorState } from "../livekit/TrackProcessorContext.tsx";
import {
  autoGainControlSetting,
  echoCancellationSetting,
  noiseSuppressionSetting,
} from "../settings/settings.ts";

// [lotus] Upstream v0.25.0 moved the audio-capture constraints to Settings.
// The Lotus host still drives them per-call via URL params (it turns browser
// noiseSuppression/AGC OFF for the in-source ML denoise tier), so
// ConnectionFactory ANDs the Setting with the URL param. These tests pin that
// contract.

const { getUrlParams } = vi.hoisted(() => ({ getUrlParams: vi.fn() }));
vi.mock("../UrlParams", () => ({ getUrlParams }));

vi.mock("livekit-client", async (importOriginal) => ({
  ...(await importOriginal()),
  Room: vi.fn().mockImplementation(function (this: LivekitRoom) {
    const emitter = new EventEmitter();
    return {
      on: emitter.on.bind(emitter),
      off: emitter.off.bind(emitter),
      emit: emitter.emit.bind(emitter),
      disconnect: vi.fn(),
      remoteParticipants: new Map(),
    } as unknown as LivekitRoom;
  }),
}));

let testScope: ObservableScope;
const mockClient: OpenIDClientParts = {
  getOpenIdToken: vi.fn().mockReturnValue(""),
  getDeviceId: vi.fn().mockReturnValue("DEV000"),
};

function createRoom(): void {
  new ECConnectionFactory(
    mockClient,
    "!roomid:example.org",
    mockMediaDevices({}),
    new BehaviorSubject<ProcessorState>({
      supported: true,
      processor: undefined,
    }),
    undefined,
    false,
  ).createConnection(testScope, exampleTransport, ownMemberMock, logger);
}

function capturedAudioDefaults(): Record<string, unknown> {
  const RoomConstructor = vi.mocked(LivekitRoom);
  const options = RoomConstructor.mock.calls.at(-1)?.[0];
  return (options?.audioCaptureDefaults ?? {}) as Record<string, unknown>;
}

beforeEach(() => {
  testScope = new ObservableScope();
  echoCancellationSetting.setValue(true);
  noiseSuppressionSetting.setValue(true);
  autoGainControlSetting.setValue(true);
});

afterEach(() => {
  testScope.end();
  vi.mocked(LivekitRoom).mockClear();
});

describe("[lotus] audio-capture URL param overrides", () => {
  test("with params defaulted to true, the Settings govern (upstream behaviour)", () => {
    getUrlParams.mockReturnValue({
      echoCancellation: true,
      noiseSuppression: true,
      autoGainControl: true,
    });
    autoGainControlSetting.setValue(false);
    createRoom();
    expect(capturedAudioDefaults()).toMatchObject({
      echoCancellation: true,
      noiseSuppression: true,
      autoGainControl: false,
    });
  });

  test("host-passed noiseSuppression=false / autoGainControl=false force OFF regardless of Settings", () => {
    getUrlParams.mockReturnValue({
      echoCancellation: true,
      noiseSuppression: false,
      autoGainControl: false,
    });
    createRoom();
    expect(capturedAudioDefaults()).toMatchObject({
      echoCancellation: true,
      noiseSuppression: false,
      autoGainControl: false,
    });
  });

  test("a URL param cannot force a constraint ON when the Setting is off", () => {
    getUrlParams.mockReturnValue({
      echoCancellation: true,
      noiseSuppression: true,
      autoGainControl: true,
    });
    echoCancellationSetting.setValue(false);
    createRoom();
    expect(capturedAudioDefaults()).toMatchObject({ echoCancellation: false });
  });
});