/*
   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 { MatrixClient, Room } from "matrix-js-sdk/src/matrix";

import { MatrixClientPeg } from "../../../src/MatrixClientPeg";
import { DirectoryMember, ThreepidMember } from "../../../src/utils/direct-messages";
import { findDMForUser } from "../../../src/utils/dm/findDMForUser";
import { findDMRoom } from "../../../src/utils/dm/findDMRoom";
import DMRoomMap from "../../../src/utils/DMRoomMap";
import { createTestClient } from "../../test-utils";

jest.mock("../../../src/utils/dm/findDMForUser", () => ({
    findDMForUser: jest.fn(),
}));

describe("findDMRoom", () => {
    const userId1 = "@user1:example.com";
    const member1 = new DirectoryMember({ user_id: userId1 });
    const member2 = new ThreepidMember("user2");
    let mockClient: MatrixClient;
    let room1: Room;
    let dmRoomMap: DMRoomMap;

    beforeEach(() => {
        mockClient = createTestClient();
        jest.spyOn(MatrixClientPeg, "get").mockReturnValue(mockClient);
        room1 = new Room("!room1:example.com", mockClient, userId1);

        dmRoomMap = {
            getDMRoomForIdentifiers: jest.fn(),
            getDMRoomsForUserId: jest.fn(),
        } as unknown as DMRoomMap;
        jest.spyOn(DMRoomMap, "shared").mockReturnValue(dmRoomMap);
    });

    it("should return the room for a single target with a room", () => {
        mocked(findDMForUser).mockReturnValue(room1);
        expect(findDMRoom(mockClient, [member1])).toBe(room1);
    });

    it("should return null for a single target without a room", () => {
        mocked(findDMForUser).mockReturnValue(null);
        expect(findDMRoom(mockClient, [member1])).toBeNull();
    });

    it("should return the room for 2 targets with a room", () => {
        mocked(dmRoomMap.getDMRoomForIdentifiers).mockReturnValue(room1);
        expect(findDMRoom(mockClient, [member1, member2])).toBe(room1);
    });

    it("should return null for 2 targets without a room", () => {
        mocked(dmRoomMap.getDMRoomForIdentifiers).mockReturnValue(null);
        expect(findDMRoom(mockClient, [member1, member2])).toBeNull();
    });
});
