import EventEmitter from "events";
import { mocked, MockedObject } from 'jest-mock';
import { MatrixEvent } from "matrix-js-sdk/src/models/event";
import { JoinRule } from 'matrix-js-sdk/src/@types/partials';
import {
    Room,
    User,
    IContent,
    IEvent,
    RoomMember,
    MatrixClient,
    EventTimeline,
    RoomState,
    EventType,
    IEventRelation,
    IUnsigned,
} from 'matrix-js-sdk/src/matrix';

import { MatrixClientPeg as peg } from '../../src/MatrixClientPeg';
import dis from '../../src/dispatcher/dispatcher';
import { makeType } from "../../src/utils/TypeUtils";
import { ValidatedServerConfig } from "../../src/utils/AutoDiscoveryUtils";
import { EnhancedMap } from "../../src/utils/maps";
import { AsyncStoreWithClient } from "../../src/stores/AsyncStoreWithClient";
import MatrixClientBackedSettingsHandler from "../../src/settings/handlers/MatrixClientBackedSettingsHandler";

/**
 * Stub out the MatrixClient, and configure the MatrixClientPeg object to
 * return it when get() is called.
 *
 * TODO: once the components are updated to get their MatrixClients from
 * the react context, we can get rid of this and just inject a test client
 * via the context instead.
 */
export function stubClient() {
    const client = createTestClient();

    // stub out the methods in MatrixClientPeg
    //
    // 'sandbox.restore()' doesn't work correctly on inherited methods,
    // so we do this for each method
    jest.spyOn(peg, 'get');
    jest.spyOn(peg, 'unset');
    jest.spyOn(peg, 'replaceUsingCreds');
    // MatrixClientPeg.get() is called a /lot/, so implement it with our own
    // fast stub function rather than a sinon stub
    peg.get = function() { return client; };
    MatrixClientBackedSettingsHandler.matrixClient = client;
}

/**
 * Create a stubbed-out MatrixClient
 *
 * @returns {object} MatrixClient stub
 */
export function createTestClient(): MatrixClient {
    const eventEmitter = new EventEmitter();

    return {
        getHomeserverUrl: jest.fn(),
        getIdentityServerUrl: jest.fn(),
        getDomain: jest.fn().mockReturnValue("matrix.rog"),
        getUserId: jest.fn().mockReturnValue("@userId:matrix.rog"),
        getUser: jest.fn().mockReturnValue({ on: jest.fn() }),
        getDeviceId: jest.fn().mockReturnValue("ABCDEFGHI"),
        credentials: { userId: "@userId:matrix.rog" },

        getPushActionsForEvent: jest.fn(),
        getRoom: jest.fn().mockImplementation(mkStubRoom),
        getRooms: jest.fn().mockReturnValue([]),
        getVisibleRooms: jest.fn().mockReturnValue([]),
        loginFlows: jest.fn(),
        on: eventEmitter.on.bind(eventEmitter),
        off: eventEmitter.off.bind(eventEmitter),
        removeListener: eventEmitter.removeListener.bind(eventEmitter),
        emit: eventEmitter.emit.bind(eventEmitter),
        isRoomEncrypted: jest.fn().mockReturnValue(false),
        peekInRoom: jest.fn().mockResolvedValue(mkStubRoom(undefined, undefined, undefined)),

        paginateEventTimeline: jest.fn().mockResolvedValue(undefined),
        sendReadReceipt: jest.fn().mockResolvedValue(undefined),
        getRoomIdForAlias: jest.fn().mockResolvedValue(undefined),
        getRoomDirectoryVisibility: jest.fn().mockResolvedValue(undefined),
        getProfileInfo: jest.fn().mockResolvedValue({}),
        getThirdpartyProtocols: jest.fn().mockResolvedValue({}),
        getClientWellKnown: jest.fn().mockReturnValue(null),
        supportsVoip: jest.fn().mockReturnValue(true),
        getTurnServersExpiry: jest.fn().mockReturnValue(2 ^ 32),
        getThirdpartyUser: jest.fn().mockResolvedValue([]),
        getAccountData: (type) => {
            return mkEvent({
                user: undefined,
                room: undefined,
                type,
                event: true,
                content: {},
            });
        },
        mxcUrlToHttp: (mxc) => `http://this.is.a.url/${mxc.substring(6)}`,
        setAccountData: jest.fn(),
        setRoomAccountData: jest.fn(),
        sendTyping: jest.fn().mockResolvedValue({}),
        sendMessage: () => jest.fn().mockResolvedValue({}),
        sendStateEvent: jest.fn().mockResolvedValue(undefined),
        getSyncState: () => "SYNCING",
        generateClientSecret: () => "t35tcl1Ent5ECr3T",
        isGuest: jest.fn().mockReturnValue(false),
        getRoomHierarchy: jest.fn().mockReturnValue({
            rooms: [],
        }),
        createRoom: jest.fn().mockResolvedValue({ room_id: "!1:example.org" }),
        setPowerLevel: jest.fn().mockResolvedValue(undefined),

        // Used by various internal bits we aren't concerned with (yet)
        sessionStore: {
            store: {
                getItem: jest.fn(),
                setItem: jest.fn(),
            },
        },
        pushRules: {},
        decryptEventIfNeeded: () => Promise.resolve(),
        isUserIgnored: jest.fn().mockReturnValue(false),
        getCapabilities: jest.fn().mockResolvedValue({}),
        supportsExperimentalThreads: () => false,
        getRoomUpgradeHistory: jest.fn().mockReturnValue([]),
        getOpenIdToken: jest.fn().mockResolvedValue(undefined),
        registerWithIdentityServer: jest.fn().mockResolvedValue({}),
        getIdentityAccount: jest.fn().mockResolvedValue({}),
        getTerms: jest.fn().mockResolvedValueOnce(undefined),
        doesServerSupportUnstableFeature: jest.fn().mockResolvedValue(undefined),
        getPushRules: jest.fn().mockResolvedValue(undefined),
        getPushers: jest.fn().mockResolvedValue({ pushers: [] }),
        getThreePids: jest.fn().mockResolvedValue({ threepids: [] }),
        setPusher: jest.fn().mockResolvedValue(undefined),
        setPushRuleEnabled: jest.fn().mockResolvedValue(undefined),
        setPushRuleActions: jest.fn().mockResolvedValue(undefined),
        relations: jest.fn().mockRejectedValue(undefined),
        isCryptoEnabled: jest.fn().mockReturnValue(false),
        downloadKeys: jest.fn(),
        fetchRoomEvent: jest.fn(),
    } as unknown as MatrixClient;
}

type MakeEventPassThruProps = {
    user: User["userId"];
    relatesTo?: IEventRelation;
    event?: boolean;
    ts?: number;
    skey?: string;
};
type MakeEventProps = MakeEventPassThruProps & {
    type: string;
    content: IContent;
    room: Room["roomId"];
    // eslint-disable-next-line camelcase
    prev_content?: IContent;
    unsigned?: IUnsigned;
};

/**
 * Create an Event.
 * @param {Object} opts Values for the event.
 * @param {string} opts.type The event.type
 * @param {string} opts.room The event.room_id
 * @param {string} opts.user The event.user_id
 * @param {string=} opts.skey Optional. The state key (auto inserts empty string)
 * @param {number=} opts.ts   Optional. Timestamp for the event
 * @param {Object} opts.content The event.content
 * @param {boolean} opts.event True to make a MatrixEvent.
 * @param {unsigned=} opts.unsigned
 * @return {Object} a JSON object representing this event.
 */
export function mkEvent(opts: MakeEventProps): MatrixEvent {
    if (!opts.type || !opts.content) {
        throw new Error("Missing .type or .content =>" + JSON.stringify(opts));
    }
    const event: Partial<IEvent> = {
        type: opts.type,
        room_id: opts.room,
        sender: opts.user,
        content: opts.content,
        prev_content: opts.prev_content,
        event_id: "$" + Math.random() + "-" + Math.random(),
        origin_server_ts: opts.ts ?? 0,
        unsigned: opts.unsigned,
    };
    if (opts.skey !== undefined) {
        event.state_key = opts.skey;
    } else if ([
        "m.room.name", "m.room.topic", "m.room.create", "m.room.join_rules",
        "m.room.power_levels", "m.room.topic", "m.room.history_visibility",
        "m.room.encryption", "m.room.member", "com.example.state",
        "m.room.guest_access", "m.room.tombstone",
    ].indexOf(opts.type) !== -1) {
        event.state_key = "";
    }

    const mxEvent = opts.event ? new MatrixEvent(event) : event as unknown as MatrixEvent;
    if (!mxEvent.sender && opts.user && opts.room) {
        mxEvent.sender = {
            userId: opts.user,
            membership: "join",
            name: opts.user,
            rawDisplayName: opts.user,
            roomId: opts.room,
            getAvatarUrl: () => {},
            getMxcAvatarUrl: () => {},
        } as unknown as RoomMember;
    }
    return mxEvent;
}

/**
 * Create an m.presence event.
 * @param {Object} opts Values for the presence.
 * @return {Object|MatrixEvent} The event
 */
export function mkPresence(opts) {
    if (!opts.user) {
        throw new Error("Missing user");
    }
    const event = {
        event_id: "$" + Math.random() + "-" + Math.random(),
        type: "m.presence",
        sender: opts.user,
        content: {
            avatar_url: opts.url,
            displayname: opts.name,
            last_active_ago: opts.ago,
            presence: opts.presence || "offline",
        },
    };
    return opts.event ? new MatrixEvent(event) : event;
}

/**
 * Create an m.room.member event.
 * @param {Object} opts Values for the membership.
 * @param {string} opts.room The room ID for the event.
 * @param {string} opts.mship The content.membership for the event.
 * @param {string} opts.prevMship The prev_content.membership for the event.
 * @param {number=} opts.ts   Optional. Timestamp for the event
 * @param {string} opts.user The user ID for the event.
 * @param {RoomMember} opts.target The target of the event.
 * @param {string=} opts.skey The other user ID for the event if applicable
 * e.g. for invites/bans.
 * @param {string} opts.name The content.displayname for the event.
 * @param {string=} opts.url The content.avatar_url for the event.
 * @param {boolean} opts.event True to make a MatrixEvent.
 * @return {Object|MatrixEvent} The event
 */
export function mkMembership(opts: MakeEventPassThruProps & {
    room: Room["roomId"];
    mship: string;
    prevMship?: string;
    name?: string;
    url?: string;
    skey?: string;
    target?: RoomMember;
}): MatrixEvent {
    const event: MakeEventProps = {
        ...opts,
        type: "m.room.member",
        content: {
            membership: opts.mship,
        },
    };
    if (!opts.skey) {
        event.skey = opts.user;
    }
    if (!opts.mship) {
        throw new Error("Missing .mship => " + JSON.stringify(opts));
    }

    if (opts.prevMship) {
        event.prev_content = { membership: opts.prevMship };
    }
    if (opts.name) { event.content.displayname = opts.name; }
    if (opts.url) { event.content.avatar_url = opts.url; }
    const e = mkEvent(event);
    if (opts.target) {
        e.target = opts.target;
    }
    return e;
}

export type MessageEventProps = MakeEventPassThruProps & {
    room: Room["roomId"];
    relatesTo?: IEventRelation;
    msg?: string;
};

/**
 * Create an m.room.message event.
 * @param {Object} opts Values for the message
 * @param {string} opts.room The room ID for the event.
 * @param {string} opts.user The user ID for the event.
 * @param {number} opts.ts The timestamp for the event.
 * @param {boolean} opts.event True to make a MatrixEvent.
 * @param {string=} opts.msg Optional. The content.body for the event.
 * @return {Object|MatrixEvent} The event
 */
export function mkMessage({ msg, relatesTo, ...opts }: MakeEventPassThruProps & {
    room: Room["roomId"];
    msg?: string;
}): MatrixEvent {
    if (!opts.room || !opts.user) {
        throw new Error("Missing .room or .user from options");
    }
    const message = msg ?? "Random->" + Math.random();
    const event: MakeEventProps = {
        ...opts,
        type: "m.room.message",
        content: {
            msgtype: "m.text",
            body: message,
            ['m.relates_to']: relatesTo,
        },
    };

    return mkEvent(event);
}

export function mkStubRoom(roomId: string = null, name: string, client: MatrixClient): Room {
    const stubTimeline = { getEvents: () => [] } as unknown as EventTimeline;
    return {
        roomId,
        getReceiptsForEvent: jest.fn().mockReturnValue([]),
        getMember: jest.fn().mockReturnValue({
            userId: '@member:domain.bla',
            name: 'Member',
            rawDisplayName: 'Member',
            roomId: roomId,
            getAvatarUrl: () => 'mxc://avatar.url/image.png',
            getMxcAvatarUrl: () => 'mxc://avatar.url/image.png',
        }),
        getMembersWithMembership: jest.fn().mockReturnValue([]),
        getJoinedMembers: jest.fn().mockReturnValue([]),
        getJoinedMemberCount: jest.fn().mockReturnValue(1),
        getMembers: jest.fn().mockReturnValue([]),
        getPendingEvents: () => [],
        getLiveTimeline: () => stubTimeline,
        getUnfilteredTimelineSet: () => null,
        findEventById: () => null,
        getAccountData: () => null,
        hasMembershipState: () => null,
        getVersion: () => '1',
        shouldUpgradeToVersion: () => null,
        getMyMembership: jest.fn().mockReturnValue("join"),
        maySendMessage: jest.fn().mockReturnValue(true),
        currentState: {
            getStateEvents: jest.fn(),
            getMember: jest.fn(),
            mayClientSendStateEvent: jest.fn().mockReturnValue(true),
            maySendStateEvent: jest.fn().mockReturnValue(true),
            maySendRedactionForEvent: jest.fn().mockReturnValue(true),
            maySendEvent: jest.fn().mockReturnValue(true),
            members: {},
            getJoinRule: jest.fn().mockReturnValue(JoinRule.Invite),
            on: jest.fn(),
        } as unknown as RoomState,
        tags: {},
        setBlacklistUnverifiedDevices: jest.fn(),
        on: jest.fn(),
        off: jest.fn(),
        removeListener: jest.fn(),
        getDMInviter: jest.fn(),
        name,
        getAvatarUrl: () => 'mxc://avatar.url/room.png',
        getMxcAvatarUrl: () => 'mxc://avatar.url/room.png',
        isSpaceRoom: jest.fn().mockReturnValue(false),
        isElementVideoRoom: jest.fn().mockReturnValue(false),
        getUnreadNotificationCount: jest.fn(() => 0),
        getEventReadUpTo: jest.fn(() => null),
        getCanonicalAlias: jest.fn(),
        getAltAliases: jest.fn().mockReturnValue([]),
        timeline: [],
        getJoinRule: jest.fn().mockReturnValue("invite"),
        loadMembersIfNeeded: jest.fn(),
        client,
        canInvite: jest.fn(),
    } as unknown as Room;
}

export function mkServerConfig(hsUrl, isUrl) {
    return makeType(ValidatedServerConfig, {
        hsUrl,
        hsName: "TEST_ENVIRONMENT",
        hsNameIsDifferent: false, // yes, we lie
        isUrl,
    });
}

export function getDispatchForStore(store) {
    // Mock the dispatcher by gut-wrenching. Stores can only __emitChange whilst a
    // dispatcher `_isDispatching` is true.
    return (payload) => {
        // these are private properties in flux dispatcher
        // fool ts
        (dis as any)._isDispatching = true;
        (dis as any)._callbacks[store._dispatchToken](payload);
        (dis as any)._isDispatching = false;
    };
}

// These methods make some use of some private methods on the AsyncStoreWithClient to simplify getting into a consistent
// ready state without needing to wire up a dispatcher and pretend to be a js-sdk client.

export const setupAsyncStoreWithClient = async <T = unknown>(store: AsyncStoreWithClient<T>, client: MatrixClient) => {
    // @ts-ignore
    store.readyStore.useUnitTestClient(client);
    // @ts-ignore
    await store.onReady();
};

export const resetAsyncStoreWithClient = async <T = unknown>(store: AsyncStoreWithClient<T>) => {
    // @ts-ignore
    await store.onNotReady();
};

export const mockStateEventImplementation = (events: MatrixEvent[]) => {
    const stateMap = new EnhancedMap<string, Map<string, MatrixEvent>>();
    events.forEach(event => {
        stateMap.getOrCreate(event.getType(), new Map()).set(event.getStateKey(), event);
    });

    // recreate the overloading in RoomState
    function getStateEvents(eventType: EventType | string): MatrixEvent[];
    function getStateEvents(eventType: EventType | string, stateKey: string): MatrixEvent;
    function getStateEvents(eventType: EventType | string, stateKey?: string) {
        if (stateKey || stateKey === "") {
            return stateMap.get(eventType)?.get(stateKey) || null;
        }
        return Array.from(stateMap.get(eventType)?.values() || []);
    }
    return getStateEvents;
};

export const mkRoom = (
    client: MatrixClient,
    roomId: string,
    rooms?: ReturnType<typeof mkStubRoom>[],
): MockedObject<Room> => {
    const room = mocked(mkStubRoom(roomId, roomId, client));
    mocked(room.currentState).getStateEvents.mockImplementation(mockStateEventImplementation([]));
    rooms?.push(room);
    return room;
};

/**
 * Upserts given events into room.currentState
 * @param room
 * @param events
 */
export const upsertRoomStateEvents = (room: Room, events: MatrixEvent[]): void => {
    const eventsMap = events.reduce((acc, event) => {
        const eventType = event.getType();
        if (!acc.has(eventType)) {
            acc.set(eventType, new Map());
        }
        acc.get(eventType).set(event.getStateKey(), event);
        return acc;
    }, room.currentState.events || new Map<string, Map<string, MatrixEvent>>());

    room.currentState.events = eventsMap;
};

export const mkSpace = (
    client: MatrixClient,
    spaceId: string,
    rooms?: ReturnType<typeof mkStubRoom>[],
    children: string[] = [],
): MockedObject<Room> => {
    const space = mocked(mkRoom(client, spaceId, rooms));
    space.isSpaceRoom.mockReturnValue(true);
    mocked(space.currentState).getStateEvents.mockImplementation(mockStateEventImplementation(children.map(roomId =>
        mkEvent({
            event: true,
            type: EventType.SpaceChild,
            room: spaceId,
            user: "@user:server",
            skey: roomId,
            content: { via: [] },
            ts: Date.now(),
        }),
    )));
    return space;
};