/*
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 React from 'react';
import { mocked } from "jest-mock";
import { MatrixClient, MatrixEvent, Room } from "matrix-js-sdk/src/matrix";
import { render, screen } from '@testing-library/react';

import EncryptionEvent from "../../../../src/components/views/messages/EncryptionEvent";
import { createTestClient, mkMessage } from "../../../test-utils";
import { MatrixClientPeg } from '../../../../src/MatrixClientPeg';
import { LocalRoom } from '../../../../src/models/LocalRoom';
import DMRoomMap from '../../../../src/utils/DMRoomMap';
import MatrixClientContext from '../../../../src/contexts/MatrixClientContext';

const renderEncryptionEvent = (client: MatrixClient, event: MatrixEvent) => {
    render(<MatrixClientContext.Provider value={client}>
        <EncryptionEvent mxEvent={event} />
    </MatrixClientContext.Provider>);
};

const checkTexts = (title: string, subTitle: string) => {
    screen.getByText(title);
    screen.getByText(subTitle);
};

describe("EncryptionEvent", () => {
    const roomId = "!room:example.com";
    const algorithm = "m.megolm.v1.aes-sha2";
    let client: MatrixClient;
    let event: MatrixEvent;

    beforeEach(() => {
        jest.clearAllMocks();
        client = createTestClient();
        jest.spyOn(MatrixClientPeg, "get").mockReturnValue(client);
        event = mkMessage({
            event: true,
            room: roomId,
            user: client.getUserId(),
        });
        jest.spyOn(DMRoomMap, "shared").mockReturnValue({
            getUserIdForRoomId: jest.fn(),
        } as unknown as DMRoomMap);
    });

    describe("for an encrypted room", () => {
        beforeEach(() => {
            event.event.content.algorithm = algorithm;
            mocked(client.isRoomEncrypted).mockReturnValue(true);
            const room = new Room(roomId, client, client.getUserId());
            mocked(client.getRoom).mockReturnValue(room);
        });

        it("should show the expected texts", () => {
            renderEncryptionEvent(client, event);
            checkTexts(
                "Encryption enabled",
                "Messages in this room are end-to-end encrypted. "
                + "When people join, you can verify them in their profile, just tap on their avatar.",
            );
        });

        describe("with same previous algorithm", () => {
            beforeEach(() => {
                jest.spyOn(event, "getPrevContent").mockReturnValue({
                    algorithm: algorithm,
                });
            });

            it("should show the expected texts", () => {
                renderEncryptionEvent(client, event);
                checkTexts(
                    "Encryption enabled",
                    "Some encryption parameters have been changed.",
                );
            });
        });

        describe("with unknown algorithm", () => {
            beforeEach(() => {
                event.event.content.algorithm = "unknown";
            });

            it("should show the expected texts", () => {
                renderEncryptionEvent(client, event);
                checkTexts("Encryption enabled", "Ignored attempt to disable encryption");
            });
        });
    });

    describe("for an unencrypted room", () => {
        beforeEach(() => {
            mocked(client.isRoomEncrypted).mockReturnValue(false);
            renderEncryptionEvent(client, event);
        });

        it("should show the expected texts", () => {
            expect(client.isRoomEncrypted).toHaveBeenCalledWith(roomId);
            checkTexts("Encryption not enabled", "The encryption used by this room isn't supported.");
        });
    });

    describe("for an encrypted local room", () => {
        beforeEach(() => {
            event.event.content.algorithm = algorithm;
            mocked(client.isRoomEncrypted).mockReturnValue(true);
            const localRoom = new LocalRoom(roomId, client, client.getUserId());
            mocked(client.getRoom).mockReturnValue(localRoom);
            renderEncryptionEvent(client, event);
        });

        it("should show the expected texts", () => {
            expect(client.isRoomEncrypted).toHaveBeenCalledWith(roomId);
            checkTexts("Encryption enabled", "Messages in this chat will be end-to-end encrypted.");
        });
    });
});
