/*
Copyright 2022 The Matrix.org Foundation C.I.C.

Licensed under the Apache License, Version 2.0 (the "License");
you may not use this file except in compliance with the License.
You may obtain a copy of the License at

    http://www.apache.org/licenses/LICENSE-2.0

Unless required by applicable law or agreed to in writing, software
distributed under the License is distributed on an "AS IS" BASIS,
WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
See the License for the specific language governing permissions and
limitations under the License.
*/

import EventEmitter from "events";
import { mocked } from "jest-mock";
import { waitFor } from "@testing-library/react";
import { RoomType, Room, RoomEvent, MatrixEvent, RoomStateEvent, PendingEventOrdering } from "matrix-js-sdk/src/matrix";
import { Widget } from "matrix-widget-api";
// eslint-disable-next-line no-restricted-imports
import { MatrixRTCSessionManagerEvents } from "matrix-js-sdk/src/matrixrtc/MatrixRTCSessionManager";
// eslint-disable-next-line no-restricted-imports
import { CallMembership } from "matrix-js-sdk/src/matrixrtc/CallMembership";
// eslint-disable-next-line no-restricted-imports
import { MatrixRTCSession, MatrixRTCSessionEvent } from "matrix-js-sdk/src/matrixrtc/MatrixRTCSession";

import type { Mocked } from "jest-mock";
import type { MatrixClient, IMyDevice, RoomMember } from "matrix-js-sdk/src/matrix";
import type { ClientWidgetApi } from "matrix-widget-api";
import {
    JitsiCallMemberContent,
    Layout,
    Call,
    CallEvent,
    ConnectionState,
    JitsiCall,
    ElementCall,
} from "../../src/models/Call";
import { stubClient, mkEvent, mkRoomMember, setupAsyncStoreWithClient, mockPlatformPeg } from "../test-utils";
import MediaDeviceHandler, { MediaDeviceKindEnum } from "../../src/MediaDeviceHandler";
import { MatrixClientPeg } from "../../src/MatrixClientPeg";
import WidgetStore from "../../src/stores/WidgetStore";
import { WidgetMessagingStore } from "../../src/stores/widgets/WidgetMessagingStore";
import ActiveWidgetStore, { ActiveWidgetStoreEvent } from "../../src/stores/ActiveWidgetStore";
import { ElementWidgetActions } from "../../src/stores/widgets/ElementWidgetActions";
import SettingsStore from "../../src/settings/SettingsStore";
import { PosthogAnalytics } from "../../src/PosthogAnalytics";

jest.spyOn(MediaDeviceHandler, "getDevices").mockResolvedValue({
    [MediaDeviceKindEnum.AudioInput]: [
        { deviceId: "1", groupId: "1", kind: "audioinput", label: "Headphones", toJSON: () => {} },
    ],
    [MediaDeviceKindEnum.VideoInput]: [
        { deviceId: "2", groupId: "2", kind: "videoinput", label: "Built-in webcam", toJSON: () => {} },
    ],
    [MediaDeviceKindEnum.AudioOutput]: [],
});
jest.spyOn(MediaDeviceHandler, "getAudioInput").mockReturnValue("1");
jest.spyOn(MediaDeviceHandler, "getVideoInput").mockReturnValue("2");

const enabledSettings = new Set(["feature_group_calls", "feature_video_rooms", "feature_element_call_video_rooms"]);
jest.spyOn(SettingsStore, "getValue").mockImplementation(
    (settingName) => enabledSettings.has(settingName) || undefined,
);

const setUpClientRoomAndStores = (): {
    client: Mocked<MatrixClient>;
    room: Room;
    alice: RoomMember;
    bob: RoomMember;
    carol: RoomMember;
} => {
    stubClient();
    const client = mocked<MatrixClient>(MatrixClientPeg.safeGet());

    const room = new Room("!1:example.org", client, "@alice:example.org", {
        pendingEventOrdering: PendingEventOrdering.Detached,
    });

    const alice = mkRoomMember(room.roomId, "@alice:example.org");
    const bob = mkRoomMember(room.roomId, "@bob:example.org");
    const carol = mkRoomMember(room.roomId, "@carol:example.org");
    jest.spyOn(room, "getMember").mockImplementation((userId) => {
        switch (userId) {
            case alice.userId:
                return alice;
            case bob.userId:
                return bob;
            case carol.userId:
                return carol;
            default:
                return null;
        }
    });

    jest.spyOn(room, "getMyMembership").mockReturnValue("join");

    client.getRoom.mockImplementation((roomId) => (roomId === room.roomId ? room : null));
    client.getRoom.mockImplementation((roomId) => (roomId === room.roomId ? room : null));
    client.matrixRTC.getRoomSession.mockImplementation((roomId) => {
        const session = new EventEmitter() as MatrixRTCSession;
        session.memberships = [];
        return session;
    });
    client.getRooms.mockReturnValue([room]);
    client.getUserId.mockReturnValue(alice.userId);
    client.getDeviceId.mockReturnValue("alices_device");
    client.reEmitter.reEmit(room, [RoomStateEvent.Events]);
    client.sendStateEvent.mockImplementation(async (roomId, eventType, content, stateKey = "") => {
        if (roomId !== room.roomId) throw new Error("Unknown room");
        const event = mkEvent({
            event: true,
            type: eventType,
            room: roomId,
            user: alice.userId,
            skey: stateKey,
            content,
        });
        room.addLiveEvents([event]);
        return { event_id: event.getId()! };
    });

    setupAsyncStoreWithClient(WidgetStore.instance, client);
    setupAsyncStoreWithClient(WidgetMessagingStore.instance, client);

    return { client, room, alice, bob, carol };
};

const cleanUpClientRoomAndStores = (client: MatrixClient, room: Room) => {
    client.reEmitter.stopReEmitting(room, [RoomStateEvent.Events]);
};

const setUpWidget = (
    call: Call,
): {
    widget: Widget;
    messaging: Mocked<ClientWidgetApi>;
    audioMutedSpy: jest.SpyInstance<boolean, []>;
    videoMutedSpy: jest.SpyInstance<boolean, []>;
} => {
    call.widget.data = { ...call.widget, skipLobby: true };
    const widget = new Widget(call.widget);

    const eventEmitter = new EventEmitter();
    const messaging = {
        on: eventEmitter.on.bind(eventEmitter),
        off: eventEmitter.off.bind(eventEmitter),
        once: eventEmitter.once.bind(eventEmitter),
        emit: eventEmitter.emit.bind(eventEmitter),
        stop: jest.fn(),
        transport: {
            send: jest.fn(),
            reply: jest.fn(),
        },
    } as unknown as Mocked<ClientWidgetApi>;
    WidgetMessagingStore.instance.storeMessaging(widget, call.roomId, messaging);

    const audioMutedSpy = jest.spyOn(MediaDeviceHandler, "startWithAudioMuted", "get");
    const videoMutedSpy = jest.spyOn(MediaDeviceHandler, "startWithVideoMuted", "get");

    return { widget, messaging, audioMutedSpy, videoMutedSpy };
};

const cleanUpCallAndWidget = (
    call: Call,
    widget: Widget,
    audioMutedSpy: jest.SpyInstance<boolean, []>,
    videoMutedSpy: jest.SpyInstance<boolean, []>,
) => {
    call.destroy();
    jest.clearAllMocks();
    WidgetMessagingStore.instance.stopMessaging(widget, call.roomId);
    audioMutedSpy.mockRestore();
    videoMutedSpy.mockRestore();
};

describe("JitsiCall", () => {
    mockPlatformPeg({ supportsJitsiScreensharing: () => true });

    let client: Mocked<MatrixClient>;
    let room: Room;
    let alice: RoomMember;
    let bob: RoomMember;
    let carol: RoomMember;

    beforeEach(() => {
        ({ client, room, alice, bob, carol } = setUpClientRoomAndStores());
        jest.spyOn(room, "getType").mockReturnValue(RoomType.ElementVideo);
    });

    afterEach(() => cleanUpClientRoomAndStores(client, room));

    describe("get", () => {
        it("finds no calls", () => {
            expect(Call.get(room)).toBeNull();
        });

        it("finds calls", async () => {
            await JitsiCall.create(room);
            expect(Call.get(room)).toBeInstanceOf(JitsiCall);
        });

        it("ignores terminated calls", async () => {
            await JitsiCall.create(room);

            // Terminate the call
            const [event] = room.currentState.getStateEvents("im.vector.modular.widgets");
            await client.sendStateEvent(room.roomId, "im.vector.modular.widgets", {}, event.getStateKey()!);

            expect(Call.get(room)).toBeNull();
        });
    });

    describe("instance in a video room", () => {
        let call: JitsiCall;
        let widget: Widget;
        let messaging: Mocked<ClientWidgetApi>;
        let audioMutedSpy: jest.SpyInstance<boolean, []>;
        let videoMutedSpy: jest.SpyInstance<boolean, []>;

        beforeEach(async () => {
            jest.useFakeTimers();
            jest.setSystemTime(0);

            await JitsiCall.create(room);
            const maybeCall = JitsiCall.get(room);
            if (maybeCall === null) throw new Error("Failed to create call");
            call = maybeCall;

            ({ widget, messaging, audioMutedSpy, videoMutedSpy } = setUpWidget(call));

            mocked(messaging.transport).send.mockImplementation(async (action: string): Promise<any> => {
                if (action === ElementWidgetActions.JoinCall) {
                    messaging.emit(
                        `action:${ElementWidgetActions.JoinCall}`,
                        new CustomEvent("widgetapirequest", { detail: {} }),
                    );
                } else if (action === ElementWidgetActions.HangupCall) {
                    messaging.emit(
                        `action:${ElementWidgetActions.HangupCall}`,
                        new CustomEvent("widgetapirequest", { detail: {} }),
                    );
                }
                return {};
            });
        });

        afterEach(() => cleanUpCallAndWidget(call, widget, audioMutedSpy, videoMutedSpy));

        it("connects muted", async () => {
            expect(call.connectionState).toBe(ConnectionState.Disconnected);
            audioMutedSpy.mockReturnValue(true);
            videoMutedSpy.mockReturnValue(true);

            await call.start();
            expect(call.connectionState).toBe(ConnectionState.Connected);
            expect(messaging.transport.send).toHaveBeenCalledWith(ElementWidgetActions.JoinCall, {
                audioInput: null,
                videoInput: null,
            });
        });

        it("connects unmuted", async () => {
            expect(call.connectionState).toBe(ConnectionState.Disconnected);
            audioMutedSpy.mockReturnValue(false);
            videoMutedSpy.mockReturnValue(false);

            await call.start();
            expect(call.connectionState).toBe(ConnectionState.Connected);
            expect(messaging.transport.send).toHaveBeenCalledWith(ElementWidgetActions.JoinCall, {
                audioInput: "Headphones",
                videoInput: "Built-in webcam",
            });
        });

        it("waits for messaging when connecting", async () => {
            // Temporarily remove the messaging to simulate connecting while the
            // widget is still initializing
            WidgetMessagingStore.instance.stopMessaging(widget, room.roomId);
            expect(call.connectionState).toBe(ConnectionState.Disconnected);

            const connect = call.start();
            expect(call.connectionState).toBe(ConnectionState.WidgetLoading);

            WidgetMessagingStore.instance.storeMessaging(widget, room.roomId, messaging);
            await connect;
            expect(call.connectionState).toBe(ConnectionState.Connected);
        });

        it("doesn't stop messaging when connecting", async () => {
            // Temporarily remove the messaging to simulate connecting while the
            // widget is still initializing
            jest.useFakeTimers();
            const oldSendMock = messaging.transport.send;
            mocked(messaging.transport).send.mockImplementation(async (action: string): Promise<any> => {
                if (action === ElementWidgetActions.JoinCall) {
                    await new Promise((resolve) => setTimeout(resolve, 100));
                    messaging.emit(
                        `action:${ElementWidgetActions.JoinCall}`,
                        new CustomEvent("widgetapirequest", { detail: {} }),
                    );
                }
            });
            expect(call.connectionState).toBe(ConnectionState.Disconnected);

            const connect = call.start();
            expect(call.connectionState).toBe(ConnectionState.WidgetLoading);
            async function runTimers() {
                jest.advanceTimersByTime(500);
                jest.advanceTimersByTime(1000);
            }
            async function runStopMessaging() {
                await new Promise((resolve) => setTimeout(resolve, 1000));
                WidgetMessagingStore.instance.stopMessaging(widget, room.roomId);
            }
            runStopMessaging();
            runTimers();
            let connectError;
            try {
                await connect;
            } catch (e) {
                console.log(e);
                connectError = e;
            }
            expect(connectError).toBeDefined();
            // const connect2 = await connect;
            // expect(connect2).toThrow();
            messaging.transport.send = oldSendMock;
            jest.useRealTimers();
        });

        it("fails to connect if the widget returns an error", async () => {
            mocked(messaging.transport).send.mockRejectedValue(new Error("never!!1! >:("));
            await expect(call.start()).rejects.toBeDefined();
        });

        it("fails to disconnect if the widget returns an error", async () => {
            await call.start();
            mocked(messaging.transport).send.mockRejectedValue(new Error("never!!1! >:("));
            await expect(call.disconnect()).rejects.toBeDefined();
        });

        it("handles remote disconnection", async () => {
            expect(call.connectionState).toBe(ConnectionState.Disconnected);

            await call.start();
            expect(call.connectionState).toBe(ConnectionState.Connected);

            const callback = jest.fn();

            call.on(CallEvent.ConnectionState, callback);

            messaging.emit(
                `action:${ElementWidgetActions.HangupCall}`,
                new CustomEvent("widgetapirequest", { detail: {} }),
            );
            await waitFor(() => {
                expect(callback).toHaveBeenNthCalledWith(1, ConnectionState.Disconnected, ConnectionState.Connected),
                    expect(callback).toHaveBeenNthCalledWith(
                        2,
                        ConnectionState.WidgetLoading,
                        ConnectionState.Disconnected,
                    );
                expect(callback).toHaveBeenNthCalledWith(3, ConnectionState.Connecting, ConnectionState.WidgetLoading);
            });
            // in video rooms we expect the call to immediately reconnect
            call.off(CallEvent.ConnectionState, callback);
        });

        it("disconnects", async () => {
            expect(call.connectionState).toBe(ConnectionState.Disconnected);
            await call.start();
            expect(call.connectionState).toBe(ConnectionState.Connected);
            await call.disconnect();
            expect(call.connectionState).toBe(ConnectionState.Disconnected);
        });

        it("disconnects when we leave the room", async () => {
            await call.start();
            expect(call.connectionState).toBe(ConnectionState.Connected);
            room.emit(RoomEvent.MyMembership, room, "leave");
            expect(call.connectionState).toBe(ConnectionState.Disconnected);
        });

        it("reconnects after disconnect in video rooms", async () => {
            expect(call.connectionState).toBe(ConnectionState.Disconnected);
            await call.start();
            expect(call.connectionState).toBe(ConnectionState.Connected);
            await call.disconnect();
            expect(call.connectionState).toBe(ConnectionState.Disconnected);
        });

        it("remains connected if we stay in the room", async () => {
            await call.start();
            expect(call.connectionState).toBe(ConnectionState.Connected);
            room.emit(RoomEvent.MyMembership, room, "join");
            expect(call.connectionState).toBe(ConnectionState.Connected);
        });

        it("tracks participants in room state", async () => {
            expect(call.participants).toEqual(new Map());

            // A participant with multiple devices (should only show up once)
            await client.sendStateEvent(
                room.roomId,
                JitsiCall.MEMBER_EVENT_TYPE,
                { devices: ["bobweb", "bobdesktop"], expires_ts: 1000 * 60 * 10 },
                bob.userId,
            );
            // A participant with an expired device (should not show up)
            await client.sendStateEvent(
                room.roomId,
                JitsiCall.MEMBER_EVENT_TYPE,
                { devices: ["carolandroid"], expires_ts: -1000 * 60 },
                carol.userId,
            );

            // Now, stub out client.sendStateEvent so we can test our local echo
            client.sendStateEvent.mockReset();
            await call.start();
            expect(call.participants).toEqual(
                new Map([
                    [alice, new Set(["alices_device"])],
                    [bob, new Set(["bobweb", "bobdesktop"])],
                ]),
            );

            await call.disconnect();
            expect(call.participants).toEqual(new Map([[bob, new Set(["bobweb", "bobdesktop"])]]));
        });

        it("updates room state when connecting and disconnecting", async () => {
            const now1 = Date.now();
            await call.start();
            await waitFor(
                () =>
                    expect(
                        room.currentState.getStateEvents(JitsiCall.MEMBER_EVENT_TYPE, alice.userId)?.getContent(),
                    ).toEqual({
                        devices: [client.getDeviceId()],
                        expires_ts: now1 + call.STUCK_DEVICE_TIMEOUT_MS,
                    }),
                { interval: 5 },
            );

            const now2 = Date.now();
            await call.disconnect();
            await waitFor(
                () =>
                    expect(
                        room.currentState.getStateEvents(JitsiCall.MEMBER_EVENT_TYPE, alice.userId)?.getContent(),
                    ).toEqual({
                        devices: [],
                        expires_ts: now2 + call.STUCK_DEVICE_TIMEOUT_MS,
                    }),
                { interval: 5 },
            );
        });

        it("repeatedly updates room state while connected", async () => {
            await call.start();
            await waitFor(
                () =>
                    expect(client.sendStateEvent).toHaveBeenLastCalledWith(
                        room.roomId,
                        JitsiCall.MEMBER_EVENT_TYPE,
                        { devices: [client.getDeviceId()], expires_ts: expect.any(Number) },
                        alice.userId,
                    ),
                { interval: 5 },
            );

            client.sendStateEvent.mockClear();
            jest.advanceTimersByTime(call.STUCK_DEVICE_TIMEOUT_MS);
            await waitFor(
                () =>
                    expect(client.sendStateEvent).toHaveBeenLastCalledWith(
                        room.roomId,
                        JitsiCall.MEMBER_EVENT_TYPE,
                        { devices: [client.getDeviceId()], expires_ts: expect.any(Number) },
                        alice.userId,
                    ),
                { interval: 5 },
            );
        });

        it("emits events when connection state changes", async () => {
            const onConnectionState = jest.fn();
            call.on(CallEvent.ConnectionState, onConnectionState);

            await call.start();
            await call.disconnect();
            expect(onConnectionState.mock.calls).toEqual([
                [ConnectionState.WidgetLoading, ConnectionState.Disconnected],
                [ConnectionState.Connecting, ConnectionState.WidgetLoading],
                [ConnectionState.Lobby, ConnectionState.Connecting],
                [ConnectionState.Connected, ConnectionState.Lobby],
                [ConnectionState.Disconnecting, ConnectionState.Connected],
                [ConnectionState.Disconnected, ConnectionState.Disconnecting],
            ]);

            call.off(CallEvent.ConnectionState, onConnectionState);
        });

        it("emits events when participants change", async () => {
            const onParticipants = jest.fn();
            call.on(CallEvent.Participants, onParticipants);

            await call.start();
            await call.disconnect();
            expect(onParticipants.mock.calls).toEqual([
                [new Map([[alice, new Set(["alices_device"])]]), new Map()],
                [new Map([[alice, new Set(["alices_device"])]]), new Map([[alice, new Set(["alices_device"])]])],
                [new Map(), new Map([[alice, new Set(["alices_device"])]])],
                [new Map(), new Map()],
            ]);

            call.off(CallEvent.Participants, onParticipants);
        });

        it("switches to spotlight layout when the widget becomes a PiP", async () => {
            await call.start();
            ActiveWidgetStore.instance.emit(ActiveWidgetStoreEvent.Undock);
            expect(messaging.transport.send).toHaveBeenCalledWith(ElementWidgetActions.SpotlightLayout, {});
            ActiveWidgetStore.instance.emit(ActiveWidgetStoreEvent.Dock);
            expect(messaging.transport.send).toHaveBeenCalledWith(ElementWidgetActions.TileLayout, {});
        });

        describe("clean", () => {
            const aliceWeb: IMyDevice = {
                device_id: "aliceweb",
                last_seen_ts: 0,
            };
            const aliceDesktop: IMyDevice = {
                device_id: "alicedesktop",
                last_seen_ts: 0,
            };
            const aliceDesktopOffline: IMyDevice = {
                device_id: "alicedesktopoffline",
                last_seen_ts: 1000 * 60 * 60 * -2, // 2 hours ago
            };
            const aliceDesktopNeverOnline: IMyDevice = {
                device_id: "alicedesktopneveronline",
            };

            const mkContent = (devices: IMyDevice[]): JitsiCallMemberContent => ({
                expires_ts: 1000 * 60 * 10,
                devices: devices.map((d) => d.device_id),
            });
            const expectDevices = (devices: IMyDevice[]) =>
                expect(
                    room.currentState.getStateEvents(JitsiCall.MEMBER_EVENT_TYPE, alice.userId)?.getContent(),
                ).toEqual({
                    expires_ts: expect.any(Number),
                    devices: devices.map((d) => d.device_id),
                });

            beforeEach(() => {
                client.getDeviceId.mockReturnValue(aliceWeb.device_id);
                client.getDevices.mockResolvedValue({
                    devices: [aliceWeb, aliceDesktop, aliceDesktopOffline, aliceDesktopNeverOnline],
                });
            });

            it("doesn't clean up valid devices", async () => {
                await call.start();
                await client.sendStateEvent(
                    room.roomId,
                    JitsiCall.MEMBER_EVENT_TYPE,
                    mkContent([aliceWeb, aliceDesktop]),
                    alice.userId,
                );

                await call.clean();
                expectDevices([aliceWeb, aliceDesktop]);
            });

            it("cleans up our own device if we're disconnected", async () => {
                await client.sendStateEvent(
                    room.roomId,
                    JitsiCall.MEMBER_EVENT_TYPE,
                    mkContent([aliceWeb, aliceDesktop]),
                    alice.userId,
                );

                await call.clean();
                expectDevices([aliceDesktop]);
            });

            it("cleans up devices that have been offline for too long", async () => {
                await client.sendStateEvent(
                    room.roomId,
                    JitsiCall.MEMBER_EVENT_TYPE,
                    mkContent([aliceDesktop, aliceDesktopOffline]),
                    alice.userId,
                );

                await call.clean();
                expectDevices([aliceDesktop]);
            });

            it("cleans up devices that have never been online", async () => {
                await client.sendStateEvent(
                    room.roomId,
                    JitsiCall.MEMBER_EVENT_TYPE,
                    mkContent([aliceDesktop, aliceDesktopNeverOnline]),
                    alice.userId,
                );

                await call.clean();
                expectDevices([aliceDesktop]);
            });

            it("no-ops if there are no state events", async () => {
                await call.clean();
                expect(room.currentState.getStateEvents(JitsiCall.MEMBER_EVENT_TYPE, alice.userId)).toBe(null);
            });
        });
    });
});

describe("ElementCall", () => {
    let client: Mocked<MatrixClient>;
    let room: Room;
    let alice: RoomMember;

    function setRoomMembers(memberIds: string[]) {
        jest.spyOn(room, "getJoinedMembers").mockReturnValue(memberIds.map((id) => ({ userId: id }) as RoomMember));
    }

    const callConnectProcedure: (call: ElementCall) => Promise<void> = async (call) => {
        async function sessionConnect() {
            await new Promise<void>((r) => {
                setTimeout(() => r(), 400);
            });
            client.matrixRTC.emit(MatrixRTCSessionManagerEvents.SessionStarted, call.roomId, {
                sessionId: undefined,
            } as unknown as MatrixRTCSession);
            call.session?.emit(
                MatrixRTCSessionEvent.MembershipsChanged,
                [],
                [{ sender: client.getUserId() } as CallMembership],
            );
        }
        async function runTimers() {
            jest.advanceTimersByTime(500);
            jest.advanceTimersByTime(500);
        }
        sessionConnect();
        const promise = call.start();
        runTimers();
        await promise;
    };
    const callDisconnectionProcedure: (call: ElementCall) => Promise<void> = async (call) => {
        async function sessionDisconnect() {
            await new Promise<void>((r) => {
                setTimeout(() => r(), 400);
            });
            client.matrixRTC.emit(MatrixRTCSessionManagerEvents.SessionStarted, call.roomId, {
                sessionId: undefined,
            } as unknown as MatrixRTCSession);
            call.session?.emit(MatrixRTCSessionEvent.MembershipsChanged, [], []);
        }
        async function runTimers() {
            jest.advanceTimersByTime(500);
            jest.advanceTimersByTime(500);
        }
        sessionDisconnect();
        const promise = call.disconnect();
        runTimers();
        await promise;
    };

    beforeEach(() => {
        jest.useFakeTimers();
        ({ client, room, alice } = setUpClientRoomAndStores());
    });

    afterEach(() => {
        jest.useRealTimers();
        cleanUpClientRoomAndStores(client, room);
    });

    describe("get", () => {
        it("finds no calls", () => {
            expect(Call.get(room)).toBeNull();
        });

        it("finds calls", async () => {
            await ElementCall.create(room);
            expect(Call.get(room)).toBeInstanceOf(ElementCall);
            Call.get(room)?.destroy();
        });

        it("finds ongoing calls that are created by the session manager", async () => {
            // There is an existing session created by another user in this room.
            client.matrixRTC.getRoomSession.mockReturnValue({
                on: (ev: any, fn: any) => {},
                off: (ev: any, fn: any) => {},
                memberships: [{ fakeVal: "fake membership" }],
            } as unknown as MatrixRTCSession);
            const call = Call.get(room);
            if (!(call instanceof ElementCall)) throw new Error("Failed to create call");
            call.destroy();
        });

        it("passes font settings through widget URL", async () => {
            const originalGetValue = SettingsStore.getValue;
            SettingsStore.getValue = <T>(name: string, roomId?: string, excludeDefault?: boolean) => {
                switch (name) {
                    case "fontSizeDelta":
                        return 4 as T;
                    case "useSystemFont":
                        return true as T;
                    case "systemFont":
                        return "OpenDyslexic, DejaVu Sans" as T;
                    default:
                        return originalGetValue<T>(name, roomId, excludeDefault);
                }
            };
            document.documentElement.style.fontSize = "12px";

            await ElementCall.create(room);
            const call = Call.get(room);
            if (!(call instanceof ElementCall)) throw new Error("Failed to create call");

            const urlParams = new URLSearchParams(new URL(call.widget.url).hash.slice(1));
            expect(urlParams.get("fontScale")).toBe("1.5");
            expect(urlParams.getAll("font")).toEqual(["OpenDyslexic", "DejaVu Sans"]);

            SettingsStore.getValue = originalGetValue;
        });

        it("passes ICE fallback preference through widget URL", async () => {
            // Test with the preference set to false
            await ElementCall.create(room);
            const call1 = Call.get(room);
            if (!(call1 instanceof ElementCall)) throw new Error("Failed to create call");

            const urlParams1 = new URLSearchParams(new URL(call1.widget.url).hash.slice(1));
            expect(urlParams1.has("allowIceFallback")).toBe(false);
            call1.destroy();

            // Now test with the preference set to true
            const originalGetValue = SettingsStore.getValue;
            SettingsStore.getValue = <T>(name: string, roomId?: string, excludeDefault?: boolean) => {
                switch (name) {
                    case "fallbackICEServerAllowed":
                        return true as T;
                    default:
                        return originalGetValue<T>(name, roomId, excludeDefault);
                }
            };

            ElementCall.create(room);
            const call2 = Call.get(room);
            if (!(call2 instanceof ElementCall)) throw new Error("Failed to create call");

            const urlParams2 = new URLSearchParams(new URL(call2.widget.url).hash.slice(1));
            expect(urlParams2.has("allowIceFallback")).toBe(true);

            call2.destroy();
            SettingsStore.getValue = originalGetValue;
        });

        it("passes analyticsID through widget URL", async () => {
            client.getAccountData.mockImplementation((eventType: string) => {
                if (eventType === PosthogAnalytics.ANALYTICS_EVENT_TYPE) {
                    return new MatrixEvent({ content: { id: "123456789987654321", pseudonymousAnalyticsOptIn: true } });
                }
                return undefined;
            });
            await ElementCall.create(room);
            const call = Call.get(room);
            if (!(call instanceof ElementCall)) throw new Error("Failed to create call");

            const urlParams = new URLSearchParams(new URL(call.widget.url).hash.slice(1));
            expect(urlParams.get("analyticsID")).toBe("123456789987654321");
            call.destroy();
        });

        it("does not pass analyticsID if `pseudonymousAnalyticsOptIn` set to false", async () => {
            client.getAccountData.mockImplementation((eventType: string) => {
                if (eventType === PosthogAnalytics.ANALYTICS_EVENT_TYPE) {
                    return new MatrixEvent({
                        content: { id: "123456789987654321", pseudonymousAnalyticsOptIn: false },
                    });
                }
                return undefined;
            });
            await ElementCall.create(room);
            const call = Call.get(room);
            if (!(call instanceof ElementCall)) throw new Error("Failed to create call");

            const urlParams = new URLSearchParams(new URL(call.widget.url).hash.slice(1));
            expect(urlParams.get("analyticsID")).toBe("");
            call.destroy();
        });

        it("passes feature_allow_screen_share_only_mode setting to allowVoipWithNoMedia url param", async () => {
            // Now test with the preference set to true
            const originalGetValue = SettingsStore.getValue;
            SettingsStore.getValue = <T>(name: string, roomId?: string, excludeDefault?: boolean) => {
                switch (name) {
                    case "feature_allow_screen_share_only_mode":
                        return true as T;
                    default:
                        return originalGetValue<T>(name, roomId, excludeDefault);
                }
            };
            await ElementCall.create(room);
            const call = Call.get(room);
            if (!(call instanceof ElementCall)) throw new Error("Failed to create call");

            const urlParams = new URLSearchParams(new URL(call.widget.url).hash.slice(1));
            expect(urlParams.get("allowVoipWithNoMedia")).toBe("true");
            SettingsStore.getValue = originalGetValue;
            call.destroy();
        });

        it("passes empty analyticsID if the id is not in the account data", async () => {
            client.getAccountData.mockImplementation((eventType: string) => {
                if (eventType === PosthogAnalytics.ANALYTICS_EVENT_TYPE) {
                    return new MatrixEvent({ content: {} });
                }
                return undefined;
            });
            await ElementCall.create(room);
            const call = Call.get(room);
            if (!(call instanceof ElementCall)) throw new Error("Failed to create call");

            const urlParams = new URLSearchParams(new URL(call.widget.url).hash.slice(1));
            expect(urlParams.get("analyticsID")).toBe("");
        });
    });

    describe("instance in a non-video room", () => {
        let call: ElementCall;
        let widget: Widget;
        let messaging: Mocked<ClientWidgetApi>;
        let audioMutedSpy: jest.SpyInstance<boolean, []>;
        let videoMutedSpy: jest.SpyInstance<boolean, []>;

        beforeEach(async () => {
            jest.useFakeTimers();
            jest.setSystemTime(0);

            await ElementCall.create(room, true);
            const maybeCall = ElementCall.get(room);
            if (maybeCall === null) throw new Error("Failed to create call");
            call = maybeCall;

            ({ widget, messaging, audioMutedSpy, videoMutedSpy } = setUpWidget(call));
        });

        afterEach(() => cleanUpCallAndWidget(call, widget, audioMutedSpy, videoMutedSpy));
        // TODO refactor initial device configuration to use the EW settings.
        // Add tests for passing EW device configuration to the widget.
        it("waits for messaging when connecting", async () => {
            // Temporarily remove the messaging to simulate connecting while the
            // widget is still initializing

            WidgetMessagingStore.instance.stopMessaging(widget, room.roomId);
            expect(call.connectionState).toBe(ConnectionState.Disconnected);

            const connect = callConnectProcedure(call);

            expect(call.connectionState).toBe(ConnectionState.WidgetLoading);

            WidgetMessagingStore.instance.storeMessaging(widget, room.roomId, messaging);
            await connect;
            expect(call.connectionState).toBe(ConnectionState.Connected);
        });

        it("fails to connect if the widget returns an error", async () => {
            // we only send a JoinCall action if the widget is preloading
            call.widget.data = { ...call.widget, preload: true };
            mocked(messaging.transport).send.mockRejectedValue(new Error("never!!1! >:("));
            await expect(call.start()).rejects.toBeDefined();
        });

        it("fails to disconnect if the widget returns an error", async () => {
            await callConnectProcedure(call);
            mocked(messaging.transport).send.mockRejectedValue(new Error("never!!1! >:("));
            await expect(call.disconnect()).rejects.toBeDefined();
        });

        it("handles remote disconnection", async () => {
            expect(call.connectionState).toBe(ConnectionState.Disconnected);

            await callConnectProcedure(call);
            expect(call.connectionState).toBe(ConnectionState.Connected);

            messaging.emit(
                `action:${ElementWidgetActions.HangupCall}`,
                new CustomEvent("widgetapirequest", { detail: {} }),
            );
            await waitFor(() => expect(call.connectionState).toBe(ConnectionState.Disconnected), { interval: 5 });
        });

        it("disconnects", async () => {
            expect(call.connectionState).toBe(ConnectionState.Disconnected);
            await callConnectProcedure(call);
            expect(call.connectionState).toBe(ConnectionState.Connected);
            await callDisconnectionProcedure(call);
            expect(call.connectionState).toBe(ConnectionState.Disconnected);
        });

        it("disconnects when we leave the room", async () => {
            await callConnectProcedure(call);
            expect(call.connectionState).toBe(ConnectionState.Connected);
            room.emit(RoomEvent.MyMembership, room, "leave");
            expect(call.connectionState).toBe(ConnectionState.Disconnected);
        });

        it("remains connected if we stay in the room", async () => {
            await callConnectProcedure(call);
            expect(call.connectionState).toBe(ConnectionState.Connected);
            room.emit(RoomEvent.MyMembership, room, "join");
            expect(call.connectionState).toBe(ConnectionState.Connected);
        });

        it("disconnects if the widget dies", async () => {
            await callConnectProcedure(call);
            expect(call.connectionState).toBe(ConnectionState.Connected);
            WidgetMessagingStore.instance.stopMessaging(widget, room.roomId);
            expect(call.connectionState).toBe(ConnectionState.Disconnected);
        });

        it("tracks layout", async () => {
            await callConnectProcedure(call);
            expect(call.layout).toBe(Layout.Tile);

            messaging.emit(
                `action:${ElementWidgetActions.SpotlightLayout}`,
                new CustomEvent("widgetapirequest", { detail: {} }),
            );
            expect(call.layout).toBe(Layout.Spotlight);

            messaging.emit(
                `action:${ElementWidgetActions.TileLayout}`,
                new CustomEvent("widgetapirequest", { detail: {} }),
            );
            expect(call.layout).toBe(Layout.Tile);
        });

        it("sets layout", async () => {
            await callConnectProcedure(call);

            await call.setLayout(Layout.Spotlight);
            expect(messaging.transport.send).toHaveBeenCalledWith(ElementWidgetActions.SpotlightLayout, {});

            await call.setLayout(Layout.Tile);
            expect(messaging.transport.send).toHaveBeenCalledWith(ElementWidgetActions.TileLayout, {});
        });

        it("emits events when connection state changes", async () => {
            // const wait = jest.spyOn(CallModule, "waitForEvent");
            const onConnectionState = jest.fn();
            call.on(CallEvent.ConnectionState, onConnectionState);

            await callConnectProcedure(call);
            await callDisconnectionProcedure(call);
            expect(onConnectionState.mock.calls).toEqual([
                [ConnectionState.WidgetLoading, ConnectionState.Disconnected],
                [ConnectionState.Connecting, ConnectionState.WidgetLoading],
                [ConnectionState.Connected, ConnectionState.Connecting],
                [ConnectionState.Disconnecting, ConnectionState.Connected],
                [ConnectionState.Disconnected, ConnectionState.Disconnecting],
            ]);

            call.off(CallEvent.ConnectionState, onConnectionState);
        });

        it("emits events when participants change", async () => {
            const onParticipants = jest.fn();
            call.session.memberships = [{ sender: alice.userId, deviceId: "alices_device" } as CallMembership];
            call.on(CallEvent.Participants, onParticipants);
            call.session.emit(MatrixRTCSessionEvent.MembershipsChanged, [], []);

            expect(onParticipants.mock.calls).toEqual([[new Map([[alice, new Set(["alices_device"])]]), new Map()]]);

            call.off(CallEvent.Participants, onParticipants);
        });

        it("emits events when layout changes", async () => {
            await callConnectProcedure(call);
            const onLayout = jest.fn();
            call.on(CallEvent.Layout, onLayout);

            messaging.emit(
                `action:${ElementWidgetActions.SpotlightLayout}`,
                new CustomEvent("widgetapirequest", { detail: {} }),
            );
            messaging.emit(
                `action:${ElementWidgetActions.TileLayout}`,
                new CustomEvent("widgetapirequest", { detail: {} }),
            );
            expect(onLayout.mock.calls).toEqual([[Layout.Spotlight], [Layout.Tile]]);

            call.off(CallEvent.Layout, onLayout);
        });

        it("ends the call immediately if the session ended", async () => {
            await callConnectProcedure(call);
            const onDestroy = jest.fn();
            call.on(CallEvent.Destroy, onDestroy);
            await callDisconnectionProcedure(call);
            // this will be called automatically
            // disconnect -> widget sends state event -> session manager notices no-one left
            client.matrixRTC.emit(
                MatrixRTCSessionManagerEvents.SessionEnded,
                room.roomId,
                {} as unknown as MatrixRTCSession,
            );
            expect(onDestroy).toHaveBeenCalled();
            call.off(CallEvent.Destroy, onDestroy);
        });

        it("clears widget persistence when destroyed", async () => {
            const destroyPersistentWidgetSpy = jest.spyOn(ActiveWidgetStore.instance, "destroyPersistentWidget");
            call.destroy();
            expect(destroyPersistentWidgetSpy).toHaveBeenCalled();
        });

        it("the perParticipantE2EE url flag is used in encrypted rooms while respecting the feature_disable_call_per_sender_encryption flag", async () => {
            // We destroy the call created in beforeEach because we test the call creation process.
            call.destroy();
            const addWidgetSpy = jest.spyOn(WidgetStore.instance, "addVirtualWidget");
            // If a room is not encrypted we will never add the perParticipantE2EE flag.
            client.isRoomEncrypted.mockReturnValue(true);

            // should create call with perParticipantE2EE flag
            ElementCall.create(room);
            expect(Call.get(room)?.widget?.data?.perParticipantE2EE).toBe(true);

            // should create call without perParticipantE2EE flag
            enabledSettings.add("feature_disable_call_per_sender_encryption");
            expect(Call.get(room)?.widget?.data?.perParticipantE2EE).toBe(false);
            enabledSettings.delete("feature_disable_call_per_sender_encryption");

            client.isRoomEncrypted.mockClear();
            addWidgetSpy.mockRestore();
        });

        it("sends notify event on connect in a room with more than two members", async () => {
            const sendEventSpy = jest.spyOn(room.client, "sendEvent");
            await ElementCall.create(room);
            await callConnectProcedure(Call.get(room) as ElementCall);
            expect(sendEventSpy).toHaveBeenCalledWith("!1:example.org", "org.matrix.msc4075.call.notify", {
                "application": "m.call",
                "call_id": "",
                "m.mentions": { room: true, user_ids: [] },
                "notify_type": "notify",
            });
        });
        it("sends ring on create in a DM (two participants) room", async () => {
            setRoomMembers(["@user:example.com", "@user2:example.com"]);

            const sendEventSpy = jest.spyOn(room.client, "sendEvent");
            await ElementCall.create(room);
            await callConnectProcedure(Call.get(room) as ElementCall);
            expect(sendEventSpy).toHaveBeenCalledWith("!1:example.org", "org.matrix.msc4075.call.notify", {
                "application": "m.call",
                "call_id": "",
                "m.mentions": { room: true, user_ids: [] },
                "notify_type": "ring",
            });
        });
    });

    describe("instance in a video room", () => {
        let call: ElementCall;
        let widget: Widget;
        let messaging: Mocked<ClientWidgetApi>;
        let audioMutedSpy: jest.SpyInstance<boolean, []>;
        let videoMutedSpy: jest.SpyInstance<boolean, []>;

        beforeEach(async () => {
            jest.useFakeTimers();
            jest.setSystemTime(0);

            jest.spyOn(room, "getType").mockReturnValue(RoomType.UnstableCall);

            await ElementCall.create(room);
            const maybeCall = ElementCall.get(room);
            if (maybeCall === null) throw new Error("Failed to create call");
            call = maybeCall;

            ({ widget, messaging, audioMutedSpy, videoMutedSpy } = setUpWidget(call));
        });

        afterEach(() => cleanUpCallAndWidget(call, widget, audioMutedSpy, videoMutedSpy));

        it("doesn't end the call when the last participant leaves", async () => {
            await callConnectProcedure(call);
            const onDestroy = jest.fn();
            call.on(CallEvent.Destroy, onDestroy);
            await callDisconnectionProcedure(call);
            expect(onDestroy).not.toHaveBeenCalled();
            call.off(CallEvent.Destroy, onDestroy);
        });

        it("connect to call with ongoing session", async () => {
            // Mock membership getter used by `roomSessionForRoom`.
            // This makes sure the roomSession will not be empty.
            jest.spyOn(MatrixRTCSession, "callMembershipsForRoom").mockImplementation(() => [
                { fakeVal: "fake membership", getMsUntilExpiry: () => 1000 } as unknown as CallMembership,
            ]);
            // Create ongoing session
            const roomSession = MatrixRTCSession.roomSessionForRoom(client, room);
            const roomSessionEmitSpy = jest.spyOn(roomSession, "emit");

            // Make sure the created session ends up in the call.
            // `getActiveRoomSession` will be used during `call.connect`
            // `getRoomSession` will be used during `Call.get`
            client.matrixRTC.getActiveRoomSession.mockImplementation(() => {
                return roomSession;
            });
            client.matrixRTC.getRoomSession.mockImplementation(() => {
                return roomSession;
            });

            await ElementCall.create(room);
            const call = Call.get(room);
            if (!(call instanceof ElementCall)) throw new Error("Failed to create call");
            expect(call.session).toBe(roomSession);
            await callConnectProcedure(call);
            expect(roomSessionEmitSpy).toHaveBeenCalledWith(
                "memberships_changed",
                [],
                [{ sender: "@alice:example.org" }],
            );
            expect(call.connectionState).toBe(ConnectionState.Connected);
            call.destroy();
        });

        it("handles remote disconnection and reconnect right after", async () => {
            expect(call.connectionState).toBe(ConnectionState.Disconnected);
            await callConnectProcedure(call);
            expect(call.connectionState).toBe(ConnectionState.Connected);

            messaging.emit(
                `action:${ElementWidgetActions.HangupCall}`,
                new CustomEvent("widgetapirequest", { detail: {} }),
            );
            // We want the call to be connecting after the hangup.
            waitFor(() => expect(call.connectionState).toBe(ConnectionState.Connecting), { interval: 5 });
        });
    });
    describe("create call", () => {
        beforeEach(async () => {
            setRoomMembers(["@user:example.com", "@user2:example.com", "@user4:example.com"]);
        });
        it("don't sent notify event if there are existing room call members", async () => {
            jest.spyOn(MatrixRTCSession, "callMembershipsForRoom").mockReturnValue([
                { application: "m.call", callId: "" } as unknown as CallMembership,
            ]);
            const sendEventSpy = jest.spyOn(room.client, "sendEvent");
            await ElementCall.create(room);
            expect(sendEventSpy).not.toHaveBeenCalled();
        });
    });
});