/*
Copyright 2025 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 { makeMockEvent, makeMockRoom, membershipTemplate, makeKey } from "./mocks";
import { RoomKeyTransport } from "../../../src/matrixrtc/RoomKeyTransport";
import { KeyTransportEvents } from "../../../src/matrixrtc/IKeyTransport";
import { EventType, MatrixClient, RoomEvent } from "../../../src";
import type { IRoomTimelineData, MatrixEvent, Room } from "../../../src";

describe("RoomKyTransport", () => {
    let client: MatrixClient;
    let room: Room & {
        emitTimelineEvent: (event: MatrixEvent) => void;
    };
    let transport: RoomKeyTransport;
    const onCallEncryptionMock = jest.fn();
    beforeEach(() => {
        onCallEncryptionMock.mockReset();
        const statistics = {
            counters: {
                roomEventEncryptionKeysSent: 0,
                roomEventEncryptionKeysReceived: 0,
            },
            totals: {
                roomEventEncryptionKeysReceivedTotalAge: 0,
            },
        };
        room = makeMockRoom([membershipTemplate]);
        client = new MatrixClient({ baseUrl: "base_url" });
        client.matrixRTC.start();
        transport = new RoomKeyTransport(room, client, statistics);
        transport.on(KeyTransportEvents.ReceivedKeys, (...p) => {
            onCallEncryptionMock(...p);
        });
        transport.start();
    });

    afterEach(() => {
        client.stopClient();
        client.matrixRTC.stop();
        transport.stop();
    });

    it("Calls onCallEncryption on encryption keys event", async () => {
        client.decryptEventIfNeeded = () => Promise.resolve();
        const timelineEvent = makeMockEvent(EventType.CallEncryptionKeysPrefix, "@mock:user.example", "!room:id", {
            call_id: "",
            keys: [makeKey(0, "testKey")],
            sent_ts: Date.now(),
            device_id: "AAAAAAA",
        });
        room.emit(RoomEvent.Timeline, timelineEvent, undefined, undefined, false, {} as IRoomTimelineData);
        await new Promise(process.nextTick);
        expect(onCallEncryptionMock).toHaveBeenCalled();
    });

    describe("event decryption", () => {
        it("Retries decryption and processes success", async () => {
            jest.useFakeTimers();
            let isDecryptionFailure = true;
            client.decryptEventIfNeeded = jest
                .fn()
                .mockReturnValueOnce(Promise.resolve())
                .mockImplementation(() => {
                    isDecryptionFailure = false;
                    return Promise.resolve();
                });

            const timelineEvent = Object.assign(
                makeMockEvent(EventType.CallEncryptionKeysPrefix, "@mock:user.example", "!room:id", {
                    call_id: "",
                    keys: [makeKey(0, "testKey")],
                    sent_ts: Date.now(),
                    device_id: "AAAAAAA",
                }),
                { isDecryptionFailure: jest.fn().mockImplementation(() => isDecryptionFailure) },
            );
            room.emit(RoomEvent.Timeline, timelineEvent, undefined, undefined, false, {} as IRoomTimelineData);

            expect(client.decryptEventIfNeeded).toHaveBeenCalledTimes(1);
            expect(onCallEncryptionMock).toHaveBeenCalledTimes(0);

            // should retry after one second:
            await jest.advanceTimersByTimeAsync(1500);

            expect(client.decryptEventIfNeeded).toHaveBeenCalledTimes(2);
            expect(onCallEncryptionMock).toHaveBeenCalledTimes(1);
            jest.useRealTimers();
        });

        it("Retries decryption and processes failure", async () => {
            try {
                jest.useFakeTimers();
                const onCallEncryptionMock = jest.fn();
                client.decryptEventIfNeeded = jest.fn().mockReturnValue(Promise.resolve());

                const timelineEvent = Object.assign(
                    makeMockEvent(EventType.CallEncryptionKeysPrefix, "@mock:user.example", "!room:id", {
                        call_id: "",
                        keys: [makeKey(0, "testKey")],
                        sent_ts: Date.now(),
                        device_id: "AAAAAAA",
                    }),
                    { isDecryptionFailure: jest.fn().mockReturnValue(true) },
                );

                room.emit(RoomEvent.Timeline, timelineEvent, undefined, undefined, false, {} as IRoomTimelineData);

                expect(client.decryptEventIfNeeded).toHaveBeenCalledTimes(1);
                expect(onCallEncryptionMock).toHaveBeenCalledTimes(0);

                // should retry after one second:
                await jest.advanceTimersByTimeAsync(1500);

                expect(client.decryptEventIfNeeded).toHaveBeenCalledTimes(2);
                expect(onCallEncryptionMock).toHaveBeenCalledTimes(0);

                // doesn't retry again:
                await jest.advanceTimersByTimeAsync(1500);

                expect(client.decryptEventIfNeeded).toHaveBeenCalledTimes(2);
                expect(onCallEncryptionMock).toHaveBeenCalledTimes(0);
            } finally {
                jest.useRealTimers();
            }
        });
    });
});