/*
Copyright 2024 New Vector Ltd.
Copyright 2022 The Matrix.org Foundation C.I.C.

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

import { mocked } from "jest-mock";
import { screen } from "jest-matrix-react";
import userEvent from "@testing-library/user-event";
import { MatrixClient, MatrixEvent, MatrixEventEvent, Room } from "matrix-js-sdk/src/matrix";
import { defer } from "matrix-js-sdk/src/utils";

import { Playback, PlaybackState } from "../../../../src/audio/Playback";
import { PlaybackManager } from "../../../../src/audio/PlaybackManager";
import { SdkContextClass } from "../../../../src/contexts/SDKContext";
import { MediaEventHelper } from "../../../../src/utils/MediaEventHelper";
import {
    VoiceBroadcastInfoState,
    VoiceBroadcastLiveness,
    VoiceBroadcastPlayback,
    VoiceBroadcastPlaybackEvent,
    VoiceBroadcastPlaybackState,
    VoiceBroadcastRecording,
} from "../../../../src/voice-broadcast";
import {
    filterConsole,
    flushPromises,
    flushPromisesWithFakeTimers,
    stubClient,
    waitEnoughCyclesForModal,
} from "../../../test-utils";
import { createTestPlayback } from "../../../test-utils/audio";
import { mkVoiceBroadcastChunkEvent, mkVoiceBroadcastInfoStateEvent } from "../utils/test-utils";
import { LazyValue } from "../../../../src/utils/LazyValue";

jest.mock("../../../../src/utils/MediaEventHelper", () => ({
    MediaEventHelper: jest.fn(),
}));

describe("VoiceBroadcastPlayback", () => {
    const userId = "@user:example.com";
    let deviceId: string;
    const roomId = "!room:example.com";
    let room: Room;
    let client: MatrixClient;
    let infoEvent: MatrixEvent;
    let playback: VoiceBroadcastPlayback;
    let onStateChanged: (state: VoiceBroadcastPlaybackState) => void;
    let chunk1Event: MatrixEvent;
    let deplayedChunk1Event: MatrixEvent;
    let chunk2Event: MatrixEvent;
    let chunk2BEvent: MatrixEvent;
    let chunk3Event: MatrixEvent;
    const chunk1Length = 2300;
    const chunk2Length = 4200;
    const chunk3Length = 6900;
    const chunk1Data = new ArrayBuffer(2);
    const chunk2Data = new ArrayBuffer(3);
    const chunk3Data = new ArrayBuffer(3);
    let delayedChunk1Helper: MediaEventHelper;
    let chunk1Helper: MediaEventHelper;
    let chunk2Helper: MediaEventHelper;
    let chunk3Helper: MediaEventHelper;
    let chunk1Playback: Playback;
    let chunk2Playback: Playback;
    let chunk3Playback: Playback;
    let middleOfSecondChunk!: number;
    let middleOfThirdChunk!: number;

    const queryConfirmListeningDialog = () => {
        return screen.queryByText(
            "If you start listening to this live broadcast, your current live broadcast recording will be ended.",
        );
    };

    const itShouldSetTheStateTo = (state: VoiceBroadcastPlaybackState) => {
        it(`should set the state to ${state}`, () => {
            expect(playback.getState()).toBe(state);
        });
    };

    const itShouldEmitAStateChangedEvent = (state: VoiceBroadcastPlaybackState) => {
        it(`should emit a ${state} state changed event`, () => {
            expect(mocked(onStateChanged)).toHaveBeenCalledWith(state, playback);
        });
    };

    const itShouldHaveLiveness = (liveness: VoiceBroadcastLiveness): void => {
        it(`should have liveness ${liveness}`, () => {
            expect(playback.getLiveness()).toBe(liveness);
        });
    };

    const startPlayback = () => {
        beforeEach(() => {
            playback.start();
        });
    };

    const pausePlayback = () => {
        beforeEach(() => {
            playback.pause();
        });
    };

    const stopPlayback = () => {
        beforeEach(() => {
            playback.stop();
        });
    };

    const mkChunkHelper = (data: ArrayBuffer): MediaEventHelper => {
        return {
            sourceBlob: {
                cachedValue: new Blob(),
                done: false,
                value: {
                    // @ts-ignore
                    arrayBuffer: jest.fn().mockResolvedValue(data),
                },
            },
        };
    };

    const mkDeplayedChunkHelper = (data: ArrayBuffer): MediaEventHelper => {
        const deferred = defer<LazyValue<Blob>>();

        setTimeout(() => {
            deferred.resolve({
                // @ts-ignore
                arrayBuffer: jest.fn().mockResolvedValue(data),
            });
        }, 7500);

        return {
            sourceBlob: {
                cachedValue: new Blob(),
                done: false,
                // @ts-ignore
                value: deferred.promise,
            },
        };
    };

    const simulateFirstChunkArrived = async (): Promise<void> => {
        jest.advanceTimersByTime(10000);
        await flushPromisesWithFakeTimers();
    };

    const mkInfoEvent = (state: VoiceBroadcastInfoState) => {
        return mkVoiceBroadcastInfoStateEvent(roomId, state, userId, deviceId);
    };

    const mkPlayback = async (fakeTimers = false): Promise<VoiceBroadcastPlayback> => {
        const playback = new VoiceBroadcastPlayback(
            infoEvent,
            client,
            SdkContextClass.instance.voiceBroadcastRecordingsStore,
        );
        jest.spyOn(playback, "removeAllListeners");
        jest.spyOn(playback, "destroy");
        playback.on(VoiceBroadcastPlaybackEvent.StateChanged, onStateChanged);
        fakeTimers ? await flushPromisesWithFakeTimers() : await flushPromises();
        return playback;
    };

    const setUpChunkEvents = (chunkEvents: MatrixEvent[]) => {
        mocked(client.relations).mockResolvedValueOnce({
            events: chunkEvents,
        });
    };

    const createChunkEvents = () => {
        chunk1Event = mkVoiceBroadcastChunkEvent(infoEvent.getId()!, userId, roomId, chunk1Length, 1);
        deplayedChunk1Event = mkVoiceBroadcastChunkEvent(infoEvent.getId()!, userId, roomId, chunk1Length, 1);
        chunk2Event = mkVoiceBroadcastChunkEvent(infoEvent.getId()!, userId, roomId, chunk2Length, 2);
        chunk2Event.setTxnId("tx-id-1");
        chunk2BEvent = mkVoiceBroadcastChunkEvent(infoEvent.getId()!, userId, roomId, chunk2Length, 2);
        chunk2BEvent.setTxnId("tx-id-1");
        chunk3Event = mkVoiceBroadcastChunkEvent(infoEvent.getId()!, userId, roomId, chunk3Length, 3);

        chunk1Helper = mkChunkHelper(chunk1Data);
        delayedChunk1Helper = mkDeplayedChunkHelper(chunk1Data);
        chunk2Helper = mkChunkHelper(chunk2Data);
        chunk3Helper = mkChunkHelper(chunk3Data);

        chunk1Playback = createTestPlayback();
        chunk2Playback = createTestPlayback();
        chunk3Playback = createTestPlayback();

        middleOfSecondChunk = (chunk1Length + chunk2Length / 2) / 1000;
        middleOfThirdChunk = (chunk1Length + chunk2Length + chunk3Length / 2) / 1000;

        jest.spyOn(PlaybackManager.instance, "createPlaybackInstance").mockImplementation(
            (buffer: ArrayBuffer, _waveForm?: number[]) => {
                if (buffer === chunk1Data) return chunk1Playback;
                if (buffer === chunk2Data) return chunk2Playback;
                if (buffer === chunk3Data) return chunk3Playback;

                throw new Error("unexpected buffer");
            },
        );

        mocked(MediaEventHelper).mockImplementation((event: MatrixEvent): any => {
            if (event === chunk1Event) return chunk1Helper;
            if (event === deplayedChunk1Event) return delayedChunk1Helper;
            if (event === chunk2Event) return chunk2Helper;
            if (event === chunk3Event) return chunk3Helper;
        });
    };

    filterConsole(
        // expected for some tests
        "Unable to load broadcast playback",
    );

    beforeEach(() => {
        client = stubClient();
        deviceId = client.getDeviceId() || "";
        room = new Room(roomId, client, client.getSafeUserId());
        mocked(client.getRoom).mockImplementation((roomId: string): Room | null => {
            if (roomId === room.roomId) return room;
            return null;
        });
        onStateChanged = jest.fn();
    });

    afterEach(async () => {
        SdkContextClass.instance.voiceBroadcastPlaybacksStore.getCurrent()?.stop();
        SdkContextClass.instance.voiceBroadcastPlaybacksStore.clearCurrent();
        await SdkContextClass.instance.voiceBroadcastRecordingsStore.getCurrent()?.stop();
        SdkContextClass.instance.voiceBroadcastRecordingsStore.clearCurrent();
        playback.destroy();
    });

    describe(`when there is a ${VoiceBroadcastInfoState.Resumed} broadcast without chunks yet`, () => {
        beforeEach(async () => {
            infoEvent = mkInfoEvent(VoiceBroadcastInfoState.Resumed);
            createChunkEvents();
            room.addLiveEvents([infoEvent]);
            playback = await mkPlayback();
        });

        describe("and calling start", () => {
            startPlayback();

            itShouldHaveLiveness("live");

            it("should be in buffering state", () => {
                expect(playback.getState()).toBe(VoiceBroadcastPlaybackState.Buffering);
            });

            it("should have duration 0", () => {
                expect(playback.durationSeconds).toBe(0);
            });

            it("should be at time 0", () => {
                expect(playback.timeSeconds).toBe(0);
            });

            describe("and calling stop", () => {
                stopPlayback();
                itShouldSetTheStateTo(VoiceBroadcastPlaybackState.Stopped);

                describe("and calling pause", () => {
                    pausePlayback();
                    // stopped voice broadcasts cannot be paused
                    itShouldSetTheStateTo(VoiceBroadcastPlaybackState.Stopped);
                });
            });

            describe("and calling pause", () => {
                pausePlayback();
                itShouldSetTheStateTo(VoiceBroadcastPlaybackState.Paused);
            });

            describe("and receiving the first chunk", () => {
                beforeEach(() => {
                    room.relations.aggregateChildEvent(chunk1Event);
                });

                itShouldSetTheStateTo(VoiceBroadcastPlaybackState.Playing);
                itShouldHaveLiveness("live");

                it("should update the duration", () => {
                    expect(playback.durationSeconds).toBe(2.3);
                });

                it("should play the first chunk", () => {
                    expect(chunk1Playback.play).toHaveBeenCalled();
                });
            });

            describe("and receiving the first undecryptable chunk", () => {
                beforeEach(() => {
                    jest.spyOn(chunk1Event, "isDecryptionFailure").mockReturnValue(true);
                    room.relations.aggregateChildEvent(chunk1Event);
                });

                itShouldSetTheStateTo(VoiceBroadcastPlaybackState.Error);

                it("should not update the duration", () => {
                    expect(playback.durationSeconds).toBe(0);
                });

                describe("and the chunk is decrypted", () => {
                    beforeEach(() => {
                        mocked(chunk1Event.isDecryptionFailure).mockReturnValue(false);
                        chunk1Event.emit(MatrixEventEvent.Decrypted, chunk1Event);
                    });

                    itShouldSetTheStateTo(VoiceBroadcastPlaybackState.Paused);

                    it("should not update the duration", () => {
                        expect(playback.durationSeconds).toBe(2.3);
                    });
                });
            });
        });
    });

    describe(`when there is a ${VoiceBroadcastInfoState.Resumed} voice broadcast with some chunks`, () => {
        beforeEach(async () => {
            mocked(client.relations).mockResolvedValueOnce({ events: [] });
            infoEvent = mkInfoEvent(VoiceBroadcastInfoState.Resumed);
            createChunkEvents();
            setUpChunkEvents([chunk2Event, chunk1Event]);
            room.addLiveEvents([infoEvent, chunk1Event, chunk2Event]);
            room.relations.aggregateChildEvent(chunk2Event);
            room.relations.aggregateChildEvent(chunk1Event);
            playback = await mkPlayback();
        });

        it("durationSeconds should have the length of the known chunks", () => {
            expect(playback.durationSeconds).toEqual(6.5);
        });

        describe("and starting a playback with a broken chunk", () => {
            beforeEach(async () => {
                mocked(chunk2Playback.prepare).mockRejectedValue("Error decoding chunk");
                await playback.start();
            });

            itShouldSetTheStateTo(VoiceBroadcastPlaybackState.Error);

            it("start() should keep it in the error state)", async () => {
                await playback.start();
                expect(playback.getState()).toBe(VoiceBroadcastPlaybackState.Error);
            });

            it("stop() should keep it in the error state)", () => {
                playback.stop();
                expect(playback.getState()).toBe(VoiceBroadcastPlaybackState.Error);
            });

            it("toggle() should keep it in the error state)", async () => {
                await playback.toggle();
                expect(playback.getState()).toBe(VoiceBroadcastPlaybackState.Error);
            });

            it("pause() should keep it in the error state)", () => {
                playback.pause();
                expect(playback.getState()).toBe(VoiceBroadcastPlaybackState.Error);
            });
        });

        describe("and an event with the same transaction Id occurs", () => {
            beforeEach(() => {
                room.addLiveEvents([chunk2BEvent]);
                room.relations.aggregateChildEvent(chunk2BEvent);
            });

            it("durationSeconds should not change", () => {
                expect(playback.durationSeconds).toEqual(6.5);
            });
        });

        describe("and calling start", () => {
            startPlayback();

            it("should play the last chunk", () => {
                expect(playback.getState()).toBe(VoiceBroadcastPlaybackState.Playing);
                // assert that the last chunk is played first
                expect(chunk2Playback.play).toHaveBeenCalled();
                expect(chunk1Playback.play).not.toHaveBeenCalled();
            });

            describe(
                "and receiving a stop info event with last_chunk_sequence = 2 and " +
                    "the playback of the last available chunk ends",
                () => {
                    beforeEach(() => {
                        const stoppedEvent = mkVoiceBroadcastInfoStateEvent(
                            roomId,
                            VoiceBroadcastInfoState.Stopped,
                            client.getSafeUserId(),
                            client.deviceId!,
                            infoEvent,
                            2,
                        );
                        room.addLiveEvents([stoppedEvent]);
                        room.relations.aggregateChildEvent(stoppedEvent);
                        chunk2Playback.emit(PlaybackState.Stopped);
                    });

                    itShouldSetTheStateTo(VoiceBroadcastPlaybackState.Stopped);
                },
            );

            describe(
                "and receiving a stop info event with last_chunk_sequence = 3 and " +
                    "the playback of the last available chunk ends",
                () => {
                    beforeEach(() => {
                        const stoppedEvent = mkVoiceBroadcastInfoStateEvent(
                            roomId,
                            VoiceBroadcastInfoState.Stopped,
                            client.getSafeUserId(),
                            client.deviceId!,
                            infoEvent,
                            3,
                        );
                        room.addLiveEvents([stoppedEvent]);
                        room.relations.aggregateChildEvent(stoppedEvent);
                        chunk2Playback.emit(PlaybackState.Stopped);
                    });

                    itShouldSetTheStateTo(VoiceBroadcastPlaybackState.Buffering);

                    describe("and the next chunk arrives", () => {
                        beforeEach(() => {
                            room.addLiveEvents([chunk3Event]);
                            room.relations.aggregateChildEvent(chunk3Event);
                        });

                        itShouldSetTheStateTo(VoiceBroadcastPlaybackState.Playing);

                        it("should play the next chunk", () => {
                            expect(chunk3Playback.play).toHaveBeenCalled();
                        });
                    });
                },
            );

            describe("and the info event is deleted", () => {
                beforeEach(() => {
                    infoEvent.makeRedacted(new MatrixEvent({}), room);
                });

                it("should stop and destroy the playback", () => {
                    expect(playback.getState()).toBe(VoiceBroadcastPlaybackState.Stopped);
                    expect(playback.destroy).toHaveBeenCalled();
                });
            });
        });

        describe("and currently recording a broadcast", () => {
            let recording: VoiceBroadcastRecording;

            beforeEach(async () => {
                recording = new VoiceBroadcastRecording(
                    mkVoiceBroadcastInfoStateEvent(
                        roomId,
                        VoiceBroadcastInfoState.Started,
                        client.getSafeUserId(),
                        client.deviceId,
                    ),
                    client,
                );
                jest.spyOn(recording, "stop");
                SdkContextClass.instance.voiceBroadcastRecordingsStore.setCurrent(recording);
                playback.start();
                await waitEnoughCyclesForModal();
            });

            it("should display a confirm modal", () => {
                expect(queryConfirmListeningDialog()).toBeInTheDocument();
            });

            describe("when confirming the dialog", () => {
                beforeEach(async () => {
                    await userEvent.click(screen.getByText("Yes, end my recording"));
                });

                it("should stop the recording", () => {
                    expect(recording.stop).toHaveBeenCalled();
                    expect(SdkContextClass.instance.voiceBroadcastRecordingsStore.getCurrent()).toBeNull();
                });

                it("should not start the playback", () => {
                    expect(playback.getState()).toBe(VoiceBroadcastPlaybackState.Playing);
                });
            });

            describe("when not confirming the dialog", () => {
                beforeEach(async () => {
                    await userEvent.click(screen.getByText("No"));
                });

                it("should not stop the recording", () => {
                    expect(recording.stop).not.toHaveBeenCalled();
                });

                it("should start the playback", () => {
                    expect(playback.getState()).toBe(VoiceBroadcastPlaybackState.Stopped);
                });
            });
        });
    });

    describe("when there is a stopped voice broadcast", () => {
        beforeEach(async () => {
            jest.useFakeTimers();
            infoEvent = mkInfoEvent(VoiceBroadcastInfoState.Stopped);
            createChunkEvents();
            // use delayed first chunk here to simulate loading time
            setUpChunkEvents([chunk2Event, deplayedChunk1Event, chunk3Event]);
            room.addLiveEvents([infoEvent, deplayedChunk1Event, chunk2Event, chunk3Event]);
            playback = await mkPlayback(true);
        });

        afterEach(() => {
            jest.useRealTimers();
        });

        it("should expose the info event", () => {
            expect(playback.infoEvent).toBe(infoEvent);
        });

        itShouldSetTheStateTo(VoiceBroadcastPlaybackState.Stopped);

        describe("and calling start", () => {
            startPlayback();

            itShouldSetTheStateTo(VoiceBroadcastPlaybackState.Buffering);

            describe("and the first chunk data has been loaded", () => {
                beforeEach(async () => {
                    await simulateFirstChunkArrived();
                });

                itShouldSetTheStateTo(VoiceBroadcastPlaybackState.Playing);

                it("should play the chunks beginning with the first one", () => {
                    // assert that the first chunk is being played
                    expect(chunk1Playback.play).toHaveBeenCalled();
                    expect(chunk2Playback.play).not.toHaveBeenCalled();
                });

                describe("and calling start again", () => {
                    it("should not play the first chunk a second time", () => {
                        expect(chunk1Playback.play).toHaveBeenCalledTimes(1);
                    });
                });

                describe("and the chunk playback progresses", () => {
                    beforeEach(() => {
                        chunk1Playback.clockInfo.liveData.update([11]);
                    });

                    it("should update the time", () => {
                        expect(playback.timeSeconds).toBe(11);
                    });
                });

                describe("and the chunk playback progresses across the actual time", () => {
                    // This can be the case if the meta data is out of sync with the actual audio data.

                    beforeEach(() => {
                        chunk1Playback.clockInfo.liveData.update([15]);
                    });

                    it("should update the time", () => {
                        expect(playback.timeSeconds).toBe(15);
                        expect(playback.timeLeftSeconds).toBe(0);
                    });
                });

                describe("and skipping to the middle of the second chunk", () => {
                    const middleOfSecondChunk = (chunk1Length + chunk2Length / 2) / 1000;

                    beforeEach(async () => {
                        await playback.skipTo(middleOfSecondChunk);
                    });

                    it("should play the second chunk", () => {
                        expect(chunk1Playback.stop).toHaveBeenCalled();
                        expect(chunk1Playback.destroy).toHaveBeenCalled();
                        expect(chunk2Playback.play).toHaveBeenCalled();
                    });

                    it("should update the time", () => {
                        expect(playback.timeSeconds).toBe(middleOfSecondChunk);
                    });

                    describe("and skipping to the start", () => {
                        beforeEach(async () => {
                            await playback.skipTo(0);
                        });

                        it("should play the first chunk", () => {
                            expect(chunk2Playback.stop).toHaveBeenCalled();
                            expect(chunk2Playback.destroy).toHaveBeenCalled();
                            expect(chunk1Playback.play).toHaveBeenCalled();
                        });

                        it("should update the time", () => {
                            expect(playback.timeSeconds).toBe(0);
                        });
                    });
                });

                describe("and skipping multiple times", () => {
                    beforeEach(async () => {
                        return Promise.all([
                            playback.skipTo(middleOfSecondChunk),
                            playback.skipTo(middleOfThirdChunk),
                            playback.skipTo(0),
                        ]);
                    });

                    it("should only skip to the first and last position", () => {
                        expect(chunk1Playback.stop).toHaveBeenCalled();
                        expect(chunk1Playback.destroy).toHaveBeenCalled();
                        expect(chunk2Playback.play).toHaveBeenCalled();

                        expect(chunk3Playback.play).not.toHaveBeenCalled();

                        expect(chunk2Playback.stop).toHaveBeenCalled();
                        expect(chunk2Playback.destroy).toHaveBeenCalled();
                        expect(chunk1Playback.play).toHaveBeenCalled();
                    });
                });

                describe("and the first chunk ends", () => {
                    beforeEach(() => {
                        chunk1Playback.emit(PlaybackState.Stopped);
                    });

                    it("should play until the end", () => {
                        // assert first chunk was unloaded
                        expect(chunk1Playback.destroy).toHaveBeenCalled();

                        // assert that the second chunk is being played
                        expect(chunk2Playback.play).toHaveBeenCalled();

                        // simulate end of second and third chunk
                        chunk2Playback.emit(PlaybackState.Stopped);
                        chunk3Playback.emit(PlaybackState.Stopped);

                        // assert that the entire playback is now in stopped state
                        expect(playback.getState()).toBe(VoiceBroadcastPlaybackState.Stopped);
                    });
                });

                describe("and calling pause", () => {
                    pausePlayback();
                    itShouldSetTheStateTo(VoiceBroadcastPlaybackState.Paused);
                    itShouldEmitAStateChangedEvent(VoiceBroadcastPlaybackState.Paused);
                });

                describe("and calling stop", () => {
                    stopPlayback();
                    itShouldSetTheStateTo(VoiceBroadcastPlaybackState.Stopped);

                    it("should stop the playback", () => {
                        expect(chunk1Playback.stop).toHaveBeenCalled();
                    });

                    describe("and skipping to somewhere in the middle of the first chunk", () => {
                        beforeEach(async () => {
                            mocked(chunk1Playback.play).mockClear();
                            await playback.skipTo(1);
                        });

                        it("should not start the playback", () => {
                            expect(chunk1Playback.play).not.toHaveBeenCalled();
                        });
                    });
                });

                describe("and calling destroy", () => {
                    beforeEach(() => {
                        playback.destroy();
                    });

                    it("should call removeAllListeners", () => {
                        expect(playback.removeAllListeners).toHaveBeenCalled();
                    });

                    it("should call destroy on the playbacks", () => {
                        expect(chunk1Playback.destroy).toHaveBeenCalled();
                        expect(chunk2Playback.destroy).toHaveBeenCalled();
                    });
                });
            });
        });

        describe("and calling toggle for the first time", () => {
            beforeEach(async () => {
                playback.toggle();
                await simulateFirstChunkArrived();
            });

            itShouldSetTheStateTo(VoiceBroadcastPlaybackState.Playing);

            describe("and calling toggle a second time", () => {
                beforeEach(async () => {
                    await playback.toggle();
                });

                itShouldSetTheStateTo(VoiceBroadcastPlaybackState.Paused);

                describe("and calling toggle a third time", () => {
                    beforeEach(async () => {
                        await playback.toggle();
                    });

                    itShouldSetTheStateTo(VoiceBroadcastPlaybackState.Playing);
                });
            });
        });

        describe("and calling stop", () => {
            stopPlayback();

            itShouldSetTheStateTo(VoiceBroadcastPlaybackState.Stopped);

            describe("and calling toggle", () => {
                beforeEach(async () => {
                    mocked(onStateChanged).mockReset();
                    playback.toggle();
                    await simulateFirstChunkArrived();
                });

                itShouldSetTheStateTo(VoiceBroadcastPlaybackState.Playing);
                itShouldEmitAStateChangedEvent(VoiceBroadcastPlaybackState.Playing);
            });
        });
    });
});