/*
Copyright 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 React from "react";
import { fireEvent, render } from "@testing-library/react";
import { Filter } from "matrix-js-sdk/src/filter";
import { EventTimeline, Room } from "matrix-js-sdk/src/matrix";
import { M_POLL_START } from "matrix-js-sdk/src/@types/polls";

import { PollHistory } from "../../../../../src/components/views/polls/pollHistory/PollHistory";
import {
    flushPromises,
    getMockClientWithEventEmitter,
    makePollEndEvent,
    makePollStartEvent,
    mockClientMethodsUser,
    mockIntlDateTimeFormat,
    setupRoomWithPollEvents,
    unmockIntlDateTimeFormat,
} from "../../../../test-utils";
import { RoomPermalinkCreator } from "../../../../../src/utils/permalinks/Permalinks";
import defaultDispatcher from "../../../../../src/dispatcher/dispatcher";
import { Action } from "../../../../../src/dispatcher/actions";
import MatrixClientContext from "../../../../../src/contexts/MatrixClientContext";

// Fake random strings to give a predictable snapshot for IDs
jest.mock("matrix-js-sdk/src/randomstring", () => ({
    randomString: () => "abdefghi",
}));

describe("<PollHistory />", () => {
    // 14.03.2022 16:15
    const now = 1647270879403;
    const userId = "@alice:domain.org";
    const roomId = "!room:domain.org";
    const mockClient = getMockClientWithEventEmitter({
        ...mockClientMethodsUser(userId),
        getRoom: jest.fn(),
        relations: jest.fn(),
        decryptEventIfNeeded: jest.fn(),
        getOrCreateFilter: jest.fn(),
        paginateEventTimeline: jest.fn(),
    });
    let room = new Room(roomId, mockClient, userId);

    const expectedFilter = new Filter(userId);
    expectedFilter.setDefinition({
        room: {
            timeline: {
                types: [M_POLL_START.name, M_POLL_START.altName],
            },
        },
    });

    const defaultProps = {
        room,
        matrixClient: mockClient,
        permalinkCreator: new RoomPermalinkCreator(room),
        onFinished: jest.fn(),
    };
    const getComponent = () =>
        render(<PollHistory {...defaultProps} />, {
            wrapper: ({ children }) => (
                <MatrixClientContext.Provider value={mockClient}>{children}</MatrixClientContext.Provider>
            ),
        });

    beforeAll(() => {
        mockIntlDateTimeFormat();
    });

    beforeEach(() => {
        room = new Room(roomId, mockClient, userId);
        mockClient.getRoom.mockReturnValue(room);
        defaultProps.room = room;
        mockClient.relations.mockResolvedValue({ events: [] });
        const timeline = room.getLiveTimeline();
        jest.spyOn(timeline, "getEvents").mockReturnValue([]);
        jest.spyOn(defaultDispatcher, "dispatch").mockClear();
        defaultProps.onFinished.mockClear();
        jest.spyOn(room, "getOrCreateFilteredTimelineSet");
        mockClient.getOrCreateFilter.mockResolvedValue(expectedFilter.filterId!);
        mockClient.paginateEventTimeline.mockReset().mockResolvedValue(false);

        jest.spyOn(Date, "now").mockReturnValue(now);
    });

    afterAll(() => {
        unmockIntlDateTimeFormat();
    });

    it("throws when room is not found", () => {
        mockClient.getRoom.mockReturnValue(null);

        expect(() => getComponent()).toThrow("Cannot find room");
    });

    it("renders a loading message while poll history is fetched", async () => {
        const timelineSet = room.getOrCreateFilteredTimelineSet(expectedFilter);
        const liveTimeline = timelineSet.getLiveTimeline();
        jest.spyOn(liveTimeline, "getPaginationToken").mockReturnValueOnce("test-pagination-token");

        const { queryByText, getByText } = getComponent();

        expect(mockClient.getOrCreateFilter).toHaveBeenCalledWith(
            `POLL_HISTORY_FILTER_${room.roomId}}`,
            expectedFilter,
        );
        // no results not shown until loading finished
        expect(queryByText("There are no active polls in this room")).not.toBeInTheDocument();
        expect(getByText("Loading polls")).toBeInTheDocument();

        // flush filter creation request
        await flushPromises();

        expect(liveTimeline.getPaginationToken).toHaveBeenCalledWith(EventTimeline.BACKWARDS);
        expect(mockClient.paginateEventTimeline).toHaveBeenCalledWith(liveTimeline, { backwards: true });
        // only one page
        expect(mockClient.paginateEventTimeline).toHaveBeenCalledTimes(1);

        // finished loading
        expect(queryByText("Loading polls")).not.toBeInTheDocument();
        expect(getByText("There are no active polls in this room")).toBeInTheDocument();
    });

    it("fetches poll history until end of timeline is reached while within time limit", async () => {
        const timelineSet = room.getOrCreateFilteredTimelineSet(expectedFilter);
        const liveTimeline = timelineSet.getLiveTimeline();

        // mock three pages of timeline history
        jest.spyOn(liveTimeline, "getPaginationToken")
            .mockReturnValueOnce("test-pagination-token-1")
            .mockReturnValueOnce("test-pagination-token-2")
            .mockReturnValueOnce("test-pagination-token-3");

        const { queryByText, getByText } = getComponent();

        expect(mockClient.getOrCreateFilter).toHaveBeenCalledWith(
            `POLL_HISTORY_FILTER_${room.roomId}}`,
            expectedFilter,
        );

        // flush filter creation request
        await flushPromises();
        // once per page
        expect(mockClient.paginateEventTimeline).toHaveBeenCalledTimes(3);

        // finished loading
        expect(queryByText("Loading polls")).not.toBeInTheDocument();
        expect(getByText("There are no active polls in this room")).toBeInTheDocument();
    });

    it("fetches poll history until event older than history period is reached", async () => {
        const timelineSet = room.getOrCreateFilteredTimelineSet(expectedFilter);
        const liveTimeline = timelineSet.getLiveTimeline();
        const thirtyOneDaysAgoTs = now - 60000 * 60 * 24 * 31;

        jest.spyOn(liveTimeline, "getEvents")
            .mockReturnValueOnce([])
            .mockReturnValueOnce([makePollStartEvent("Question?", userId, undefined, { ts: thirtyOneDaysAgoTs })]);

        // mock three pages of timeline history
        jest.spyOn(liveTimeline, "getPaginationToken")
            .mockReturnValueOnce("test-pagination-token-1")
            .mockReturnValueOnce("test-pagination-token-2")
            .mockReturnValueOnce("test-pagination-token-3");

        getComponent();

        // flush filter creation request
        await flushPromises();
        // after first fetch the time limit is reached
        // stop paging
        expect(mockClient.paginateEventTimeline).toHaveBeenCalledTimes(1);
    });

    it("renders a no polls message when there are no active polls in the room", async () => {
        const { getByText } = getComponent();
        await flushPromises();

        expect(getByText("There are no active polls in this room")).toBeTruthy();
    });

    it("renders a no polls message and a load more button when not at end of timeline", async () => {
        const timelineSet = room.getOrCreateFilteredTimelineSet(expectedFilter);
        const liveTimeline = timelineSet.getLiveTimeline();
        const fourtyDaysAgoTs = now - 60000 * 60 * 24 * 40;
        const pollStart = makePollStartEvent("Question?", userId, undefined, { ts: fourtyDaysAgoTs, id: "1" });

        jest.spyOn(liveTimeline, "getEvents").mockReset().mockReturnValueOnce([]).mockReturnValueOnce([pollStart]);

        // mock three pages of timeline history
        jest.spyOn(liveTimeline, "getPaginationToken")
            .mockReturnValueOnce("test-pagination-token-1")
            .mockReturnValueOnce("test-pagination-token-2")
            .mockReturnValueOnce("test-pagination-token-3");

        const { getByText } = getComponent();
        await flushPromises();

        expect(mockClient.paginateEventTimeline).toHaveBeenCalledTimes(1);

        expect(getByText("There are no active polls. Load more polls to view polls for previous months")).toBeTruthy();

        fireEvent.click(getByText("Load more polls"));

        // paged again
        expect(mockClient.paginateEventTimeline).toHaveBeenCalledTimes(2);
        // load more polls button still in UI, with loader
        expect(getByText("Load more polls")).toMatchSnapshot();

        await flushPromises();

        // no more spinner
        expect(getByText("Load more polls")).toMatchSnapshot();
    });

    it("renders a no past polls message when there are no past polls in the room", async () => {
        const { getByText } = getComponent();
        await flushPromises();

        fireEvent.click(getByText("Past polls"));

        expect(getByText("There are no past polls in this room")).toBeTruthy();
    });

    it("renders a list of active polls when there are polls in the room", async () => {
        const timestamp = 1675300825090;
        const pollStart1 = makePollStartEvent("Question?", userId, undefined, { ts: timestamp, id: "$1" });
        const pollStart2 = makePollStartEvent("Where?", userId, undefined, { ts: timestamp + 10000, id: "$2" });
        const pollStart3 = makePollStartEvent("What?", userId, undefined, { ts: timestamp + 70000, id: "$3" });
        const pollEnd3 = makePollEndEvent(pollStart3.getId()!, roomId, userId, timestamp + 1);
        await setupRoomWithPollEvents([pollStart2, pollStart3, pollStart1], [], [pollEnd3], mockClient, room);

        const { container, queryByText, getByTestId } = getComponent();

        // flush relations calls for polls
        await flushPromises();

        expect(getByTestId("filter-tab-PollHistory_filter-ACTIVE").firstElementChild).toBeChecked();

        expect(container).toMatchSnapshot();
        // this poll is ended, and default filter is ACTIVE
        expect(queryByText("What?")).not.toBeInTheDocument();
    });

    it("updates when new polls are added to the room", async () => {
        const timestamp = 1675300825090;
        const pollStart1 = makePollStartEvent("Question?", userId, undefined, { ts: timestamp, id: "$1" });
        const pollStart2 = makePollStartEvent("Where?", userId, undefined, { ts: timestamp + 10000, id: "$2" });
        // initially room has only one poll
        await setupRoomWithPollEvents([pollStart1], [], [], mockClient, room);

        const { getByText } = getComponent();

        // wait for relations
        await flushPromises();

        expect(getByText("Question?")).toBeInTheDocument();

        // add another poll
        // paged history requests using cli.paginateEventTimeline
        // call this with new events
        await room.processPollEvents([pollStart2]);
        // await relations for new poll
        await flushPromises();

        expect(getByText("Question?")).toBeInTheDocument();
        // list updated to include new poll
        expect(getByText("Where?")).toBeInTheDocument();
    });

    it("filters ended polls", async () => {
        const pollStart1 = makePollStartEvent("Question?", userId, undefined, { ts: 1675300825090, id: "$1" });
        const pollStart2 = makePollStartEvent("Where?", userId, undefined, { ts: 1675300725090, id: "$2" });
        const pollStart3 = makePollStartEvent("What?", userId, undefined, { ts: 1675200725090, id: "$3" });
        const pollEnd3 = makePollEndEvent(pollStart3.getId()!, roomId, userId, 1675200725090 + 1);
        await setupRoomWithPollEvents([pollStart1, pollStart2, pollStart3], [], [pollEnd3], mockClient, room);

        const { getByText, queryByText, getByTestId } = getComponent();
        await flushPromises();

        expect(getByText("Question?")).toBeInTheDocument();
        expect(getByText("Where?")).toBeInTheDocument();
        // this poll is ended, and default filter is ACTIVE
        expect(queryByText("What?")).not.toBeInTheDocument();

        fireEvent.click(getByText("Past polls"));
        expect(getByTestId("filter-tab-PollHistory_filter-ENDED").firstElementChild).toBeChecked();

        // active polls no longer shown
        expect(queryByText("Question?")).not.toBeInTheDocument();
        expect(queryByText("Where?")).not.toBeInTheDocument();
        // this poll is ended
        expect(getByText("What?")).toBeInTheDocument();
    });

    describe("Poll detail", () => {
        const timestamp = 1675300825090;
        const pollStart1 = makePollStartEvent("Question?", userId, undefined, { ts: timestamp, id: "$1" });
        const pollStart2 = makePollStartEvent("Where?", userId, undefined, { ts: timestamp + 10000, id: "$2" });
        const pollStart3 = makePollStartEvent("What?", userId, undefined, { ts: timestamp + 70000, id: "$3" });
        const pollEnd3 = makePollEndEvent(pollStart3.getId()!, roomId, userId, timestamp + 1, "$4");

        it("displays poll detail on active poll list item click", async () => {
            await setupRoomWithPollEvents([pollStart1, pollStart2, pollStart3], [], [pollEnd3], mockClient, room);

            const { getByText, queryByText } = getComponent();
            await flushPromises();

            fireEvent.click(getByText("Question?"));

            expect(queryByText("Poll history")).not.toBeInTheDocument();
            // elements from MPollBody
            expect(getByText("Question?")).toMatchSnapshot();
            expect(getByText("Socks")).toBeInTheDocument();
            expect(getByText("Shoes")).toBeInTheDocument();
        });

        it("links to the poll start event from an active poll detail", async () => {
            await setupRoomWithPollEvents([pollStart1, pollStart2, pollStart3], [], [pollEnd3], mockClient, room);

            const { getByText } = getComponent();
            await flushPromises();

            fireEvent.click(getByText("Question?"));

            // links to poll start event
            expect(getByText("View poll in timeline").getAttribute("href")).toBe(
                `https://matrix.to/#/!room:domain.org/${pollStart1.getId()!}`,
            );
        });

        it("navigates in app when clicking view in timeline button", async () => {
            await setupRoomWithPollEvents([pollStart1, pollStart2, pollStart3], [], [pollEnd3], mockClient, room);

            const { getByText } = getComponent();
            await flushPromises();

            fireEvent.click(getByText("Question?"));

            const event = new MouseEvent("click", { bubbles: true, cancelable: true });
            jest.spyOn(event, "preventDefault");
            fireEvent(getByText("View poll in timeline"), event);

            expect(event.preventDefault).toHaveBeenCalled();

            expect(defaultDispatcher.dispatch).toHaveBeenCalledWith({
                action: Action.ViewRoom,
                event_id: pollStart1.getId()!,
                highlighted: true,
                metricsTrigger: undefined,
                room_id: pollStart1.getRoomId()!,
            });

            // dialog closed
            expect(defaultProps.onFinished).toHaveBeenCalled();
        });

        it("doesnt navigate in app when view in timeline link is ctrl + clicked", async () => {
            await setupRoomWithPollEvents([pollStart1, pollStart2, pollStart3], [], [pollEnd3], mockClient, room);

            const { getByText } = getComponent();
            await flushPromises();

            fireEvent.click(getByText("Question?"));

            const event = new MouseEvent("click", { bubbles: true, cancelable: true, ctrlKey: true });
            jest.spyOn(event, "preventDefault");
            fireEvent(getByText("View poll in timeline"), event);

            expect(event.preventDefault).not.toHaveBeenCalled();
            expect(defaultDispatcher.dispatch).not.toHaveBeenCalled();
            expect(defaultProps.onFinished).not.toHaveBeenCalled();
        });

        it("navigates back to poll list from detail view on header click", async () => {
            await setupRoomWithPollEvents([pollStart1, pollStart2, pollStart3], [], [pollEnd3], mockClient, room);

            const { getByText, queryByText, getByTestId, container } = getComponent();
            await flushPromises();

            fireEvent.click(getByText("Question?"));

            // detail view
            expect(getByText("Question?")).toBeInTheDocument();

            // header not shown
            expect(queryByText("Poll history")).not.toBeInTheDocument();

            expect(getByText("Active polls")).toMatchSnapshot();
            fireEvent.click(getByText("Active polls"));

            // main list header displayed again
            expect(getByText("Poll history")).toBeInTheDocument();
            // active filter still active
            expect(getByTestId("filter-tab-PollHistory_filter-ACTIVE").firstElementChild).toBeChecked();
            // list displayed
            expect(container.getElementsByClassName("mx_PollHistoryList_list").length).toBeTruthy();
        });

        it("displays poll detail on past poll list item click", async () => {
            await setupRoomWithPollEvents([pollStart1, pollStart2, pollStart3], [], [pollEnd3], mockClient, room);

            const { getByText } = getComponent();
            await flushPromises();

            fireEvent.click(getByText("Past polls"));

            // pollStart3 is ended
            fireEvent.click(getByText("What?"));

            expect(getByText("What?")).toMatchSnapshot();
        });

        it("links to the poll end events from a ended poll detail", async () => {
            await setupRoomWithPollEvents([pollStart1, pollStart2, pollStart3], [], [pollEnd3], mockClient, room);

            const { getByText } = getComponent();
            await flushPromises();

            fireEvent.click(getByText("Past polls"));

            // pollStart3 is ended
            fireEvent.click(getByText("What?"));

            // links to poll end event
            expect(getByText("View poll in timeline").getAttribute("href")).toBe(
                `https://matrix.to/#/!room:domain.org/${pollEnd3.getId()!}`,
            );
        });
    });
});