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

import UnwrappedSpacePanel from "../../../../src/components/views/spaces/SpacePanel";
import { MatrixClientPeg } from "../../../../src/MatrixClientPeg";
import { MetaSpace, SpaceKey } from "../../../../src/stores/spaces";
import { shouldShowComponent } from "../../../../src/customisations/helpers/UIComponents";
import { UIComponent } from "../../../../src/settings/UIFeature";
import { mkStubRoom, wrapInSdkContext } from "../../../test-utils";
import { SdkContextClass } from "../../../../src/contexts/SDKContext";
import SpaceStore from "../../../../src/stores/spaces/SpaceStore";
import DMRoomMap from "../../../../src/utils/DMRoomMap";

// DND test utilities based on
// https://github.com/colinrobertbrooks/react-beautiful-dnd-test-utils/issues/18#issuecomment-1373388693
enum Keys {
    SPACE = 32,
    ARROW_LEFT = 37,
    ARROW_UP = 38,
    ARROW_RIGHT = 39,
    ARROW_DOWN = 40,
}

enum DragDirection {
    LEFT = Keys.ARROW_LEFT,
    UP = Keys.ARROW_UP,
    RIGHT = Keys.ARROW_RIGHT,
    DOWN = Keys.ARROW_DOWN,
}

// taken from https://github.com/hello-pangea/dnd/blob/main/test/unit/integration/util/controls.ts#L20
const createTransitionEndEvent = (): Event => {
    const event = new Event("transitionend", {
        bubbles: true,
        cancelable: true,
    }) as TransitionEvent;

    // cheating and adding property to event as
    // TransitionEvent constructor does not exist.
    // This is needed because of the following check
    //   https://github.com/atlassian/react-beautiful-dnd/blob/master/src/view/draggable/draggable.jsx#L130
    // eslint-disable-next-line @typescript-eslint/no-explicit-any
    (event as any).propertyName = "transform";

    return event;
};

const pickUp = async (element: HTMLElement) => {
    fireEvent.keyDown(element, {
        keyCode: Keys.SPACE,
    });
    await screen.findByText(/You have lifted an item/i);

    act(() => {
        jest.runOnlyPendingTimers();
    });
};

const move = async (element: HTMLElement, direction: DragDirection) => {
    fireEvent.keyDown(element, {
        keyCode: direction,
    });
    await screen.findByText(/(You have moved the item | has been combined with)/i);
};

const drop = async (element: HTMLElement) => {
    fireEvent.keyDown(element, {
        keyCode: Keys.SPACE,
    });
    fireEvent(element.parentElement!, createTransitionEndEvent());

    await screen.findByText(/You have dropped the item/i);
};

jest.mock("../../../../src/stores/spaces/SpaceStore", () => {
    // eslint-disable-next-line @typescript-eslint/no-var-requires
    const EventEmitter = require("events");
    class MockSpaceStore extends EventEmitter {
        invitedSpaces: SpaceKey[] = [];
        enabledMetaSpaces: MetaSpace[] = [];
        spacePanelSpaces: string[] = [];
        activeSpace: SpaceKey = "!space1";
        getChildSpaces = () => [];
        getNotificationState = () => null;
        setActiveSpace = jest.fn();
        moveRootSpace = jest.fn();
    }
    return {
        instance: new MockSpaceStore(),
    };
});

jest.mock("../../../../src/customisations/helpers/UIComponents", () => ({
    shouldShowComponent: jest.fn(),
}));

describe("<SpacePanel />", () => {
    const mockClient = {
        getUserId: jest.fn().mockReturnValue("@test:test"),
        getSafeUserId: jest.fn().mockReturnValue("@test:test"),
        mxcUrlToHttp: jest.fn(),
        getRoom: jest.fn(),
        isGuest: jest.fn(),
        getAccountData: jest.fn(),
        on: jest.fn(),
        removeListener: jest.fn(),
    } as unknown as MatrixClient;
    const SpacePanel = wrapInSdkContext(UnwrappedSpacePanel, SdkContextClass.instance);

    beforeAll(() => {
        jest.spyOn(MatrixClientPeg, "get").mockReturnValue(mockClient);
    });

    beforeEach(() => {
        mocked(shouldShowComponent).mockClear().mockReturnValue(true);
    });

    describe("create new space button", () => {
        it("renders create space button when UIComponent.CreateSpaces component should be shown", () => {
            render(<SpacePanel />);
            screen.getByTestId("create-space-button");
        });

        it("does not render create space button when UIComponent.CreateSpaces component should not be shown", () => {
            mocked(shouldShowComponent).mockReturnValue(false);
            render(<SpacePanel />);
            expect(shouldShowComponent).toHaveBeenCalledWith(UIComponent.CreateSpaces);
            expect(screen.queryByTestId("create-space-button")).toBeFalsy();
        });

        it("opens context menu on create space button click", () => {
            render(<SpacePanel />);
            fireEvent.click(screen.getByTestId("create-space-button"));
            screen.getByTestId("create-space-button");
        });
    });

    it("should allow rearranging via drag and drop", async () => {
        (SpaceStore.instance.spacePanelSpaces as any) = [
            mkStubRoom("!room1:server", "Room 1", mockClient),
            mkStubRoom("!room2:server", "Room 2", mockClient),
            mkStubRoom("!room3:server", "Room 3", mockClient),
        ];
        DMRoomMap.makeShared();
        jest.useFakeTimers();

        const { getByLabelText } = render(<SpacePanel />);

        const room1 = getByLabelText("Room 1");
        await pickUp(room1);
        await move(room1, DragDirection.DOWN);
        await drop(room1);

        expect(SpaceStore.instance.moveRootSpace).toHaveBeenCalledWith(0, 1);
    });
});