/*
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 { mocked } from "jest-mock";
import { EventType, IContent, KnownMembership, MatrixClient, MatrixEvent, Room } from "matrix-js-sdk/src/matrix";

import SdkConfig from "../../src/SdkConfig";
import SettingsStore from "../../src/settings/SettingsStore";
import { MemberListStore } from "../../src/stores/MemberListStore";
import { stubClient } from "../test-utils";
import { TestSdkContext } from "../TestSdkContext";

describe("MemberListStore", () => {
    const alice = "@alice:bar";
    const bob = "@bob:bar";
    const charlie = "@charlie:bar";
    const roomId = "!foo:bar";
    let store: MemberListStore;
    let client: MatrixClient;
    let room: Room;

    beforeEach(() => {
        const context = new TestSdkContext();
        client = stubClient();
        client.baseUrl = "https://invalid.base.url.here";
        context.client = client;
        store = new MemberListStore(context);
        // alice is joined to the room.
        room = new Room(roomId, client, client.getUserId()!);
        room.currentState.setStateEvents([
            new MatrixEvent({
                type: EventType.RoomCreate,
                state_key: "",
                content: {
                    creator: alice,
                },
                sender: alice,
                room_id: roomId,
                event_id: "$1",
            }),
            new MatrixEvent({
                type: EventType.RoomMember,
                state_key: alice,
                content: {
                    membership: KnownMembership.Join,
                },
                sender: alice,
                room_id: roomId,
                event_id: "$2",
            }),
        ]);
        room.recalculate();
        mocked(client.getRoom).mockImplementation((r: string): Room | null => {
            if (r === roomId) {
                return room;
            }
            return null;
        });
        SdkConfig.put({
            enable_presence_by_hs_url: {
                [client.baseUrl]: false,
            },
        });
    });

    it("loads members in a room", async () => {
        addMember(room, bob, KnownMembership.Invite);
        addMember(room, charlie, KnownMembership.Leave);

        const { invited, joined } = await store.loadMemberList(roomId);
        expect(invited).toEqual([room.getMember(bob)]);
        expect(joined).toEqual([room.getMember(alice)]);
    });

    it("fails gracefully for invalid rooms", async () => {
        const { invited, joined } = await store.loadMemberList("!idontexist:bar");
        expect(invited).toEqual([]);
        expect(joined).toEqual([]);
    });

    it("sorts by power level", async () => {
        addMember(room, bob, KnownMembership.Join);
        addMember(room, charlie, KnownMembership.Join);
        setPowerLevels(room, {
            users: {
                [alice]: 100,
                [charlie]: 50,
            },
            users_default: 10,
        });

        const { invited, joined } = await store.loadMemberList(roomId);
        expect(invited).toEqual([]);
        expect(joined).toEqual([room.getMember(alice), room.getMember(charlie), room.getMember(bob)]);
    });

    it("sorts by name if power level is equal", async () => {
        const doris = "@doris:bar";
        addMember(room, bob, KnownMembership.Join);
        addMember(room, charlie, KnownMembership.Join);
        setPowerLevels(room, {
            users_default: 10,
        });

        let { invited, joined } = await store.loadMemberList(roomId);
        expect(invited).toEqual([]);
        expect(joined).toEqual([room.getMember(alice), room.getMember(bob), room.getMember(charlie)]);

        // Ensure it sorts by display name if they are set
        addMember(room, doris, KnownMembership.Join, "AAAAA");
        ({ invited, joined } = await store.loadMemberList(roomId));
        expect(invited).toEqual([]);
        expect(joined).toEqual([
            room.getMember(doris),
            room.getMember(alice),
            room.getMember(bob),
            room.getMember(charlie),
        ]);
    });

    it("filters based on a search query", async () => {
        const mice = "@mice:bar";
        const zorro = "@zorro:bar";
        addMember(room, bob, KnownMembership.Join);
        addMember(room, mice, KnownMembership.Join);

        let { invited, joined } = await store.loadMemberList(roomId, "ice");
        expect(invited).toEqual([]);
        expect(joined).toEqual([room.getMember(alice), room.getMember(mice)]);

        // Ensure it filters by display name if they are set
        addMember(room, zorro, KnownMembership.Join, "ice ice baby");
        ({ invited, joined } = await store.loadMemberList(roomId, "ice"));
        expect(invited).toEqual([]);
        expect(joined).toEqual([room.getMember(alice), room.getMember(zorro), room.getMember(mice)]);
    });

    describe("lazy loading", () => {
        beforeEach(() => {
            mocked(client.hasLazyLoadMembersEnabled).mockReturnValue(true);
            room.loadMembersIfNeeded = jest.fn();
            mocked(room.loadMembersIfNeeded).mockResolvedValue(true);
        });

        it("calls Room.loadMembersIfNeeded once when enabled", async () => {
            let { joined } = await store.loadMemberList(roomId);
            expect(joined).toEqual([room.getMember(alice)]);
            expect(room.loadMembersIfNeeded).toHaveBeenCalledTimes(1);
            ({ joined } = await store.loadMemberList(roomId));
            expect(joined).toEqual([room.getMember(alice)]);
            expect(room.loadMembersIfNeeded).toHaveBeenCalledTimes(1);
        });
    });

    describe("sliding sync", () => {
        beforeEach(() => {
            jest.spyOn(SettingsStore, "getValue").mockImplementation((settingName, roomId, value) => {
                return settingName === "feature_sliding_sync"; // this is enabled, everything else is disabled.
            });
            client.members = jest.fn();
        });

        it("calls /members when lazy loading", async () => {
            mocked(client.members).mockResolvedValue({
                chunk: [
                    {
                        type: EventType.RoomMember,
                        state_key: bob,
                        content: {
                            membership: KnownMembership.Join,
                            displayname: "Bob",
                        },
                        sender: bob,
                        room_id: room.roomId,
                        event_id: "$" + Math.random(),
                        origin_server_ts: 2,
                    },
                ],
            });
            const { joined } = await store.loadMemberList(roomId);
            expect(joined).toEqual([room.getMember(alice), room.getMember(bob)]);
            expect(client.members).toHaveBeenCalled();
        });

        it("does not use lazy loading on encrypted rooms", async () => {
            client.isRoomEncrypted = jest.fn();
            mocked(client.isRoomEncrypted).mockReturnValue(true);

            const { joined } = await store.loadMemberList(roomId);
            expect(joined).toEqual([room.getMember(alice)]);
            expect(client.members).not.toHaveBeenCalled();
        });
    });
});

function addEventToRoom(room: Room, ev: MatrixEvent) {
    room.getLiveTimeline().addEvent(ev, {
        toStartOfTimeline: false,
    });
}

function setPowerLevels(room: Room, pl: IContent) {
    addEventToRoom(
        room,
        new MatrixEvent({
            type: EventType.RoomPowerLevels,
            state_key: "",
            content: pl,
            sender: room.getCreator()!,
            room_id: room.roomId,
            event_id: "$" + Math.random(),
        }),
    );
}

function addMember(room: Room, userId: string, membership: string, displayName?: string) {
    addEventToRoom(
        room,
        new MatrixEvent({
            type: EventType.RoomMember,
            state_key: userId,
            content: {
                membership: membership,
                displayname: displayName,
            },
            sender: userId,
            room_id: room.roomId,
            event_id: "$" + Math.random(),
        }),
    );
}