/*
Copyright 2023 Nordeck IT + Consulting GmbH

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 { act, fireEvent, render, screen } from "@testing-library/react";
import {
    EventTimeline,
    EventType,
    JoinRule,
    MatrixError,
    MatrixEvent,
    Room,
    RoomMember,
    RoomStateEvent,
} from "matrix-js-sdk/src/matrix";
import React from "react";

import ErrorDialog from "../../../../src/components/views/dialogs/ErrorDialog";
import { RoomSettingsTab } from "../../../../src/components/views/dialogs/RoomSettingsDialog";
import { RoomKnocksBar } from "../../../../src/components/views/rooms/RoomKnocksBar";
import MatrixClientContext from "../../../../src/contexts/MatrixClientContext";
import dis from "../../../../src/dispatcher/dispatcher";
import Modal from "../../../../src/Modal";
import {
    clearAllModals,
    flushPromises,
    getMockClientWithEventEmitter,
    mockClientMethodsUser,
} from "../../../test-utils";
import * as languageHandler from "../../../../src/languageHandler";

describe("RoomKnocksBar", () => {
    const userId = "@alice:example.org";
    const client = getMockClientWithEventEmitter({
        ...mockClientMethodsUser(userId),
        invite: jest.fn(),
        kick: jest.fn(),
    });
    const roomId = "#ask-to-join:example.org";
    const member = new RoomMember(roomId, userId);
    const room = new Room(roomId, client, userId);
    const state = room.getLiveTimeline().getState(EventTimeline.FORWARDS)!;

    type ButtonNames = "Approve" | "Deny" | "View" | "View message";
    const getButton = (name: ButtonNames) => screen.getByRole("button", { name });
    const getComponent = (room: Room) =>
        render(
            <MatrixClientContext.Provider value={client}>
                <RoomKnocksBar room={room} />
            </MatrixClientContext.Provider>,
        );

    beforeEach(() => {
        jest.spyOn(room, "getMember").mockReturnValue(member);
        jest.spyOn(room, "getJoinRule").mockReturnValue(JoinRule.Knock);
    });

    it("does not render if the room join rule is not knock", () => {
        jest.spyOn(room, "getJoinRule").mockReturnValue(JoinRule.Invite);
        jest.spyOn(room, "getMembersWithMembership").mockReturnValue([member]);
        jest.spyOn(room, "canInvite").mockReturnValue(true);
        jest.spyOn(state, "hasSufficientPowerLevelFor").mockReturnValue(true);
        expect(getComponent(room).container.firstChild).toBeNull();
    });

    describe("without requests to join", () => {
        beforeEach(() => {
            jest.spyOn(room, "getMembersWithMembership").mockReturnValue([]);
            jest.spyOn(room, "canInvite").mockReturnValue(true);
            jest.spyOn(state, "hasSufficientPowerLevelFor").mockReturnValue(true);
        });

        it("does not render if user can neither approve nor deny", () => {
            jest.spyOn(room, "canInvite").mockReturnValue(false);
            jest.spyOn(state, "hasSufficientPowerLevelFor").mockReturnValue(false);
            expect(getComponent(room).container.firstChild).toBeNull();
        });

        it("does not render if user cannot approve", () => {
            jest.spyOn(room, "canInvite").mockReturnValue(false);
            expect(getComponent(room).container.firstChild).toBeNull();
        });

        it("does not render if user cannot deny", () => {
            jest.spyOn(state, "hasSufficientPowerLevelFor").mockReturnValue(false);
            expect(getComponent(room).container.firstChild).toBeNull();
        });

        it("does not render if user can approve and deny", () => {
            expect(getComponent(room).container.firstChild).toBeNull();
        });
    });

    describe("with requests to join", () => {
        const error = new MatrixError();
        const bob = new RoomMember(roomId, "@bob:example.org");
        const jane = new RoomMember(roomId, "@jane:example.org");
        const john = new RoomMember(roomId, "@john:example.org");
        const other = new RoomMember(roomId, "@doe:example.org");

        bob.setMembershipEvent(
            new MatrixEvent({
                content: { displayname: "Bob", membership: Membership.Knock },
                type: EventType.RoomMember,
            }),
        );
        jane.setMembershipEvent(
            new MatrixEvent({
                content: { displayname: "Jane", membership: Membership.Knock },
                type: EventType.RoomMember,
            }),
        );
        john.setMembershipEvent(
            new MatrixEvent({
                content: { displayname: "John", membership: Membership.Knock },
                type: EventType.RoomMember,
            }),
        );
        other.setMembershipEvent(
            new MatrixEvent({ content: { membership: Membership.Knock }, type: EventType.RoomMember }),
        );

        beforeEach(async () => {
            await clearAllModals();
            jest.spyOn(room, "getMembersWithMembership").mockReturnValue([bob]);
            jest.spyOn(room, "canInvite").mockReturnValue(true);
            jest.spyOn(state, "hasSufficientPowerLevelFor").mockReturnValue(true);
            jest.spyOn(Modal, "createDialog");
            jest.spyOn(dis, "dispatch");
            jest.spyOn(languageHandler, "getUserLanguage").mockReturnValue("en-GB");
        });

        it("does not render if user can neither approve nor deny", () => {
            jest.spyOn(room, "canInvite").mockReturnValue(false);
            jest.spyOn(state, "hasSufficientPowerLevelFor").mockReturnValue(false);
            expect(getComponent(room).container.firstChild).toBeNull();
        });

        it("unhides the bar when a new knock request appears", () => {
            jest.spyOn(room, "getMembersWithMembership").mockReturnValue([]);
            const { container } = getComponent(room);
            expect(container.firstChild).toBeNull();
            jest.spyOn(room, "getMembersWithMembership").mockReturnValue([bob]);
            act(() => {
                room.emit(RoomStateEvent.Update, state);
            });
            expect(container.firstChild).not.toBeNull();
        });

        it("updates when the list of knocking users changes", () => {
            getComponent(room);
            expect(screen.getByRole("heading")).toHaveTextContent("Asking to join");
            jest.spyOn(room, "getMembersWithMembership").mockReturnValue([bob, jane]);
            act(() => {
                room.emit(RoomStateEvent.Update, state);
            });
            expect(screen.getByRole("heading")).toHaveTextContent("2 people asking to join");
        });

        describe("when knock members count is 1", () => {
            beforeEach(() => jest.spyOn(room, "getMembersWithMembership").mockReturnValue([bob]));

            it("renders a heading and a paragraph with name and user ID", () => {
                getComponent(room);
                expect(screen.getByRole("heading")).toHaveTextContent("Asking to join");
                expect(screen.getByRole("paragraph")).toHaveTextContent(`${bob.name} (${bob.userId})`);
            });

            describe("when a knock reason is not provided", () => {
                it("does not render a link to open the room settings people tab", () => {
                    getComponent(room);
                    expect(screen.queryByRole("button", { name: "View message" })).not.toBeInTheDocument();
                });
            });

            describe("when a knock reason is provided", () => {
                it("renders a link to open the room settings people tab", () => {
                    bob.setMembershipEvent(
                        new MatrixEvent({
                            content: { displayname: "Bob", membership: Membership.Knock, reason: "some reason" },
                            type: EventType.RoomMember,
                        }),
                    );
                    getComponent(room);
                    fireEvent.click(getButton("View message"));
                    expect(dis.dispatch).toHaveBeenCalledWith({
                        action: "open_room_settings",
                        initial_tab_id: RoomSettingsTab.People,
                        room_id: roomId,
                    });
                });
            });

            type TestCase = [string, ButtonNames, () => void];
            it.each<TestCase>([
                ["deny request fails", "Deny", () => jest.spyOn(client, "kick").mockRejectedValue(error)],
                ["deny request succeeds", "Deny", () => jest.spyOn(client, "kick").mockResolvedValue({})],
                ["approve request fails", "Approve", () => jest.spyOn(client, "invite").mockRejectedValue(error)],
                ["approve request succeeds", "Approve", () => jest.spyOn(client, "invite").mockResolvedValue({})],
            ])("toggles the disabled attribute for the buttons when a %s", async (_, buttonName, setup) => {
                setup();
                getComponent(room);
                fireEvent.click(getButton(buttonName));
                expect(getButton("Deny")).toHaveAttribute("disabled");
                expect(getButton("Approve")).toHaveAttribute("disabled");
                await act(() => flushPromises());
                expect(getButton("Deny")).not.toHaveAttribute("disabled");
                expect(getButton("Approve")).not.toHaveAttribute("disabled");
            });

            it("disables the deny button if the power level is insufficient", () => {
                jest.spyOn(state, "hasSufficientPowerLevelFor").mockReturnValue(false);
                getComponent(room);
                expect(getButton("Deny")).toHaveAttribute("disabled");
            });

            it("calls kick on deny", async () => {
                jest.spyOn(client, "kick").mockResolvedValue({});
                getComponent(room);
                fireEvent.click(getButton("Deny"));
                await act(() => flushPromises());
                expect(client.kick).toHaveBeenCalledWith(roomId, bob.userId);
            });

            it("displays an error when a deny request fails", async () => {
                jest.spyOn(client, "kick").mockRejectedValue(error);
                getComponent(room);
                fireEvent.click(getButton("Deny"));
                await act(() => flushPromises());
                expect(Modal.createDialog).toHaveBeenCalledWith(ErrorDialog, {
                    title: error.name,
                    description: error.message,
                });
            });

            it("disables the approve button if the power level is insufficient", () => {
                jest.spyOn(room, "canInvite").mockReturnValue(false);
                getComponent(room);
                expect(getButton("Approve")).toHaveAttribute("disabled");
            });

            it("calls invite on approve", async () => {
                jest.spyOn(client, "invite").mockResolvedValue({});
                getComponent(room);
                fireEvent.click(getButton("Approve"));
                await act(() => flushPromises());
                expect(client.invite).toHaveBeenCalledWith(roomId, bob.userId);
            });

            it("displays an error when an approval fails", async () => {
                jest.spyOn(client, "invite").mockRejectedValue(error);
                getComponent(room);
                fireEvent.click(getButton("Approve"));
                await act(() => flushPromises());
                expect(Modal.createDialog).toHaveBeenCalledWith(ErrorDialog, {
                    title: error.name,
                    description: error.message,
                });
            });

            it("hides the bar when someone else approves or denies the waiting person", () => {
                getComponent(room);
                jest.spyOn(room, "getMembersWithMembership").mockReturnValue([]);
                act(() => {
                    room.emit(RoomStateEvent.Members, new MatrixEvent(), state, bob);
                });
                expect(getComponent(room).container.firstChild).toBeNull();
            });
        });

        describe("when knock members count is greater than 1", () => {
            beforeEach(() => {
                jest.spyOn(room, "getMembersWithMembership").mockReturnValue([bob, jane]);
                getComponent(room);
            });

            it("renders a heading with count", () => {
                expect(screen.getByRole("heading")).toHaveTextContent("2 people asking to join");
            });

            it("renders a button to open the room settings people tab", () => {
                fireEvent.click(getButton("View"));
                expect(dis.dispatch).toHaveBeenCalledWith({
                    action: "open_room_settings",
                    initial_tab_id: RoomSettingsTab.People,
                    room_id: roomId,
                });
            });
        });

        describe("when knock members count is 2", () => {
            it("renders a paragraph with two names", () => {
                jest.spyOn(room, "getMembersWithMembership").mockReturnValue([bob, jane]);
                getComponent(room);
                expect(screen.getByRole("paragraph")).toHaveTextContent(`${bob.name} and ${jane.name}`);
            });
        });

        describe("when knock members count is 3", () => {
            it("renders a paragraph with three names", () => {
                jest.spyOn(room, "getMembersWithMembership").mockReturnValue([bob, jane, john]);
                getComponent(room);
                expect(screen.getByRole("paragraph")).toHaveTextContent(`${bob.name}, ${jane.name} and ${john.name}`);
            });
        });

        describe("when knock count is greater than 3", () => {
            it("renders a paragraph with two names and a count", () => {
                jest.spyOn(room, "getMembersWithMembership").mockReturnValue([bob, jane, john, other]);
                getComponent(room);
                expect(screen.getByRole("paragraph")).toHaveTextContent(`${bob.name}, ${jane.name} and 2 others`);
            });
        });
    });
});