/*
Copyright 2022 - 2023 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 {
    EventType,
    IRoomEvent,
    MatrixClient,
    MatrixEvent,
    MsgType,
    Room,
    RoomMember,
    RoomState,
} from "matrix-js-sdk/src/matrix";
import fetchMock from "fetch-mock-jest";
import escapeHtml from "escape-html";

import { filterConsole, mkStubRoom, REPEATABLE_DATE, stubClient } from "../../test-utils";
import { ExportType, IExportOptions } from "../../../src/utils/exportUtils/exportUtils";
import SdkConfig from "../../../src/SdkConfig";
import HTMLExporter from "../../../src/utils/exportUtils/HtmlExport";
import DMRoomMap from "../../../src/utils/DMRoomMap";
import { mediaFromMxc } from "../../../src/customisations/Media";

jest.mock("jszip");

const EVENT_MESSAGE: IRoomEvent = {
    event_id: "$1",
    type: EventType.RoomMessage,
    sender: "@bob:example.com",
    origin_server_ts: 0,
    content: {
        msgtype: "m.text",
        body: "Message",
        avatar_url: "mxc://example.org/avatar.bmp",
    },
};

const EVENT_ATTACHMENT: IRoomEvent = {
    event_id: "$2",
    type: EventType.RoomMessage,
    sender: "@alice:example.com",
    origin_server_ts: 1,
    content: {
        msgtype: MsgType.File,
        body: "hello.txt",
        filename: "hello.txt",
        url: "mxc://example.org/test-id",
    },
};

const EVENT_ATTACHMENT_MALFORMED: IRoomEvent = {
    event_id: "$2",
    type: EventType.RoomMessage,
    sender: "@alice:example.com",
    origin_server_ts: 1,
    content: {
        msgtype: MsgType.File,
        body: "hello.txt",
        file: {
            url: undefined,
        },
    },
};

describe("HTMLExport", () => {
    let client: jest.Mocked<MatrixClient>;
    let room: Room;

    filterConsole(
        "Starting export",
        "events in", // Fetched # events in # seconds
        "events so far",
        "Export successful!",
        "does not have an m.room.create event",
        "Creating HTML",
        "Generating a ZIP",
        "Cleaning up",
    );

    beforeEach(() => {
        jest.useFakeTimers();
        jest.setSystemTime(REPEATABLE_DATE);

        client = stubClient() as jest.Mocked<MatrixClient>;
        DMRoomMap.makeShared(client);

        room = new Room("!myroom:example.org", client, "@me:example.org");
        client.getRoom.mockReturnValue(room);
    });

    function mockMessages(...events: IRoomEvent[]): void {
        client.createMessagesRequest.mockImplementation((_roomId, fromStr, limit = 30) => {
            const from = fromStr === null ? 0 : parseInt(fromStr);
            const chunk = events.slice(from, limit);
            return Promise.resolve({
                chunk,
                from: from.toString(),
                to: (from + limit).toString(),
            });
        });
    }

    /** Retrieve a map of files within the zip. */
    function getFiles(exporter: HTMLExporter): { [filename: string]: Blob } {
        //@ts-ignore private access
        const files = exporter.files;
        return files.reduce((d, f) => ({ ...d, [f.name]: f.blob }), {});
    }

    function getMessageFile(exporter: HTMLExporter): Blob {
        const files = getFiles(exporter);
        return files["messages.html"]!;
    }

    /** set a mock fetch response for an MXC */
    function mockMxc(mxc: string, body: string) {
        const media = mediaFromMxc(mxc, client);
        fetchMock.get(media.srcHttp!, body);
    }

    it("should throw when created with invalid config for LastNMessages", async () => {
        expect(
            () =>
                new HTMLExporter(
                    room,
                    ExportType.LastNMessages,
                    {
                        attachmentsIncluded: false,
                        maxSize: 1_024 * 1_024,
                        numberOfMessages: undefined,
                    },
                    () => {},
                ),
        ).toThrow("Invalid export options");
    });

    it("should have an SDK-branded destination file name", () => {
        const roomName = "My / Test / Room: Welcome";
        const stubOptions: IExportOptions = {
            attachmentsIncluded: false,
            maxSize: 50000000,
        };
        const stubRoom = mkStubRoom("!myroom:example.org", roomName, client);
        const exporter = new HTMLExporter(stubRoom, ExportType.Timeline, stubOptions, () => {});

        expect(exporter.destinationFileName).toMatchSnapshot();

        SdkConfig.put({ brand: "BrandedChat/WithSlashes/ForFun" });

        expect(exporter.destinationFileName).toMatchSnapshot();
    });

    it("should export", async () => {
        const events = [...Array(50)].map<IRoomEvent>((_, i) => ({
            event_id: `${i}`,
            type: EventType.RoomMessage,
            sender: `@user${i}:example.com`,
            origin_server_ts: 5_000 + i * 1000,
            content: {
                msgtype: "m.text",
                body: `Message #${i}`,
            },
        }));
        mockMessages(...events);

        const exporter = new HTMLExporter(
            room,
            ExportType.LastNMessages,
            {
                attachmentsIncluded: false,
                maxSize: 1_024 * 1_024,
                numberOfMessages: events.length,
            },
            () => {},
        );

        await exporter.export();

        const file = getMessageFile(exporter);
        expect(await file.text()).toMatchSnapshot();
    });

    it("should include the room's avatar", async () => {
        mockMessages(EVENT_MESSAGE);

        const mxc = "mxc://www.example.com/avatars/nice-room.jpeg";
        const avatar = "011011000110111101101100";
        jest.spyOn(room, "getMxcAvatarUrl").mockReturnValue(mxc);
        mockMxc(mxc, avatar);

        const exporter = new HTMLExporter(
            room,
            ExportType.Timeline,
            {
                attachmentsIncluded: false,
                maxSize: 1_024 * 1_024,
            },
            () => {},
        );

        await exporter.export();

        const files = getFiles(exporter);
        expect(await files["room.png"]!.text()).toBe(avatar);
    });

    it("should include the creation event", async () => {
        const creator = "@bob:example.com";
        mockMessages(EVENT_MESSAGE);
        room.currentState.setStateEvents([
            new MatrixEvent({
                type: EventType.RoomCreate,
                event_id: "$00001",
                room_id: room.roomId,
                sender: creator,
                origin_server_ts: 0,
                content: {},
                state_key: "",
            }),
        ]);

        const exporter = new HTMLExporter(
            room,
            ExportType.Timeline,
            {
                attachmentsIncluded: false,
                maxSize: 1_024 * 1_024,
            },
            () => {},
        );

        await exporter.export();

        expect(await getMessageFile(exporter).text()).toContain(`${creator} created this room.`);
    });

    it("should include the topic", async () => {
        const topic = ":^-) (-^:";
        mockMessages(EVENT_MESSAGE);
        room.currentState.setStateEvents([
            new MatrixEvent({
                type: EventType.RoomTopic,
                event_id: "$00001",
                room_id: room.roomId,
                sender: "@alice:example.com",
                origin_server_ts: 0,
                content: { topic },
                state_key: "",
            }),
        ]);

        const exporter = new HTMLExporter(
            room,
            ExportType.Timeline,
            {
                attachmentsIncluded: false,
                maxSize: 1_024 * 1_024,
            },
            () => {},
        );

        await exporter.export();

        expect(await getMessageFile(exporter).text()).toContain(`Topic: ${topic}`);
    });

    it("should include avatars", async () => {
        mockMessages(EVENT_MESSAGE);

        jest.spyOn(RoomMember.prototype, "getMxcAvatarUrl").mockReturnValue("mxc://example.org/avatar.bmp");

        const avatarContent = "this is a bitmap all the pixels are red :^-)";
        mockMxc("mxc://example.org/avatar.bmp", avatarContent);

        const exporter = new HTMLExporter(
            room,
            ExportType.Timeline,
            {
                attachmentsIncluded: false,
                maxSize: 1_024 * 1_024,
            },
            () => {},
        );

        await exporter.export();

        // Ensure that the avatar is present
        const files = getFiles(exporter);
        const file = files["users/@bob-example.com.png"];
        expect(file).not.toBeUndefined();

        // Ensure it has the expected content
        expect(await file.text()).toBe(avatarContent);
    });

    it("should handle when an event has no sender", async () => {
        const EVENT_MESSAGE_NO_SENDER: IRoomEvent = {
            event_id: "$1",
            type: EventType.RoomMessage,
            sender: "",
            origin_server_ts: 0,
            content: {
                msgtype: "m.text",
                body: "Message with no sender",
            },
        };
        mockMessages(EVENT_MESSAGE_NO_SENDER);

        const exporter = new HTMLExporter(
            room,
            ExportType.Timeline,
            {
                attachmentsIncluded: false,
                maxSize: 1_024 * 1_024,
            },
            () => {},
        );

        await exporter.export();

        const file = getMessageFile(exporter);
        expect(await file.text()).toContain(EVENT_MESSAGE_NO_SENDER.content.body);
    });

    it("should handle when events sender cannot be found in room state", async () => {
        mockMessages(EVENT_MESSAGE);

        jest.spyOn(RoomState.prototype, "getSentinelMember").mockReturnValue(null);

        const exporter = new HTMLExporter(
            room,
            ExportType.Timeline,
            {
                attachmentsIncluded: false,
                maxSize: 1_024 * 1_024,
            },
            () => {},
        );

        await exporter.export();

        const file = getMessageFile(exporter);
        expect(await file.text()).toContain(EVENT_MESSAGE.content.body);
    });

    it("should include attachments", async () => {
        mockMessages(EVENT_MESSAGE, EVENT_ATTACHMENT);
        const attachmentBody = "Lorem ipsum dolor sit amet";

        mockMxc("mxc://example.org/test-id", attachmentBody);

        const exporter = new HTMLExporter(
            room,
            ExportType.Timeline,
            {
                attachmentsIncluded: true,
                maxSize: 1_024 * 1_024,
            },
            () => {},
        );

        await exporter.export();

        // Ensure that the attachment is present
        const files = getFiles(exporter);
        const file = files[Object.keys(files).find((k) => k.endsWith(".txt"))!];
        expect(file).not.toBeUndefined();

        // Ensure that the attachment has the expected content
        const text = await file.text();
        expect(text).toBe(attachmentBody);
    });

    it("should handle when attachment cannot be fetched", async () => {
        mockMessages(EVENT_MESSAGE, EVENT_ATTACHMENT_MALFORMED, EVENT_ATTACHMENT);
        const attachmentBody = "Lorem ipsum dolor sit amet";

        mockMxc("mxc://example.org/test-id", attachmentBody);

        const exporter = new HTMLExporter(
            room,
            ExportType.Timeline,
            {
                attachmentsIncluded: true,
                maxSize: 1_024 * 1_024,
            },
            () => {},
        );

        await exporter.export();

        // good attachment present
        const files = getFiles(exporter);
        const file = files[Object.keys(files).find((k) => k.endsWith(".txt"))!];
        expect(file).not.toBeUndefined();

        // Ensure that the attachment has the expected content
        const text = await file.text();
        expect(text).toBe(attachmentBody);

        // messages export still successful
        const messagesFile = getMessageFile(exporter);
        expect(await messagesFile.text()).toBeTruthy();
    });

    it("should handle when attachment srcHttp is falsy", async () => {
        mockMessages(EVENT_MESSAGE, EVENT_ATTACHMENT);
        const attachmentBody = "Lorem ipsum dolor sit amet";

        mockMxc("mxc://example.org/test-id", attachmentBody);

        jest.spyOn(client, "mxcUrlToHttp").mockReturnValue(null);

        const exporter = new HTMLExporter(
            room,
            ExportType.Timeline,
            {
                attachmentsIncluded: true,
                maxSize: 1_024 * 1_024,
            },
            () => {},
        );

        await exporter.export();

        // attachment not present
        const files = getFiles(exporter);
        const file = files[Object.keys(files).find((k) => k.endsWith(".txt"))!];
        expect(file).toBeUndefined();

        // messages export still successful
        const messagesFile = getMessageFile(exporter);
        expect(await messagesFile.text()).toBeTruthy();
    });

    it("should omit attachments", async () => {
        mockMessages(EVENT_MESSAGE, EVENT_ATTACHMENT);

        const exporter = new HTMLExporter(
            room,
            ExportType.Timeline,
            {
                attachmentsIncluded: false,
                maxSize: 1_024 * 1_024,
            },
            () => {},
        );

        await exporter.export();

        // Ensure that the attachment is present
        const files = getFiles(exporter);
        for (const fileName of Object.keys(files)) {
            expect(fileName).not.toMatch(/^files\/hello/);
        }
    });

    it("should add link to next and previous file", async () => {
        const exporter = new HTMLExporter(
            room,
            ExportType.LastNMessages,
            {
                attachmentsIncluded: false,
                maxSize: 1_024 * 1_024,
                numberOfMessages: 5000,
            },
            () => {},
        );

        // test link to the first page
        //@ts-ignore private access
        let result = await exporter.wrapHTML("", 0, 3);
        expect(result).not.toContain("Previous group of messages");
        expect(result).toContain(
            '<div style="text-align:center;margin:10px"><a href="./messages2.html" style="font-weight:bold">Next group of messages</a></div>',
        );

        // test link for a middle page
        //@ts-ignore private access
        result = await exporter.wrapHTML("", 1, 3);
        expect(result).toContain(
            '<div style="text-align:center"><a href="./messages.html" style="font-weight:bold">Previous group of messages</a></div>',
        );
        expect(result).toContain(
            '<div style="text-align:center;margin:10px"><a href="./messages3.html" style="font-weight:bold">Next group of messages</a></div>',
        );

        // test link for last page
        //@ts-ignore private access
        result = await exporter.wrapHTML("", 2, 3);
        expect(result).toContain(
            '<div style="text-align:center"><a href="./messages2.html" style="font-weight:bold">Previous group of messages</a></div>',
        );
        expect(result).not.toContain("Next group of messages");
    });

    it("should not leak javascript from room names or topics", async () => {
        const name = "<svg onload=alert(3)>";
        const topic = "<svg onload=alert(5)>";
        mockMessages(EVENT_MESSAGE);
        room.currentState.setStateEvents([
            new MatrixEvent({
                type: EventType.RoomName,
                event_id: "$00001",
                room_id: room.roomId,
                sender: "@alice:example.com",
                origin_server_ts: 0,
                content: { name },
                state_key: "",
            }),
            new MatrixEvent({
                type: EventType.RoomTopic,
                event_id: "$00002",
                room_id: room.roomId,
                sender: "@alice:example.com",
                origin_server_ts: 1,
                content: { topic },
                state_key: "",
            }),
        ]);
        room.recalculate();

        const exporter = new HTMLExporter(
            room,
            ExportType.Timeline,
            {
                attachmentsIncluded: false,
                maxSize: 1_024 * 1_024,
            },
            () => {},
        );

        await exporter.export();
        const html = await getMessageFile(exporter).text();

        expect(html).not.toContain(`${name}`);
        expect(html).toContain(`${escapeHtml(name)}`);
        expect(html).not.toContain(`${topic}`);
        expect(html).toContain(`Topic: ${escapeHtml(topic)}`);
    });
});