"use strict";
/*
Copyright 2020 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.
*/
/**
 * Caches membership of virtual users to rooms in memory
 * and also stores the state of whether users are registered.
 */
class MembershipCache {
    constructor() {
        this._membershipMap = {
        // room_id: { user_id: "join|invite|leave|ban|null" }   null=unknown
        };
        this._registeredUsers = new Set();
    }
    /**
     * Get's the *cached* state of a user's membership for a room.
     * This DOES NOT check to verify the value is correct (i.e the
     * room may have state reset and left the user from the room).
     *
     * This only caches users from the appservice.
     *
     * @param {string}} roomId Room id to check the state of.
     * @param {string} userId The userid to check the state of.
     * @returns {string} The membership state of the user, e.g. "joined"
     */
    getMemberEntry(roomId, userId) {
        if (this._membershipMap[roomId] === undefined) {
            return null;
        }
        return this._membershipMap[roomId][userId];
    }
    /**
     * Set the *cached* state of a user's membership for a room.
     * Use this to optimise intents so that they do not attempt
     * to join a room if we know they are joined.
     * This DOES NOT set the actual membership of the room.
     *
     * This only caches users from the appservice.
     * @param {string} roomId Room id to set the state of.
     * @param {string} userId The userid to set the state of.
     * @param {string} membership The membership value to set for the user
     *                       e.g joined.
     */
    setMemberEntry(roomId, userId, membership) {
        if (this._membershipMap[roomId] === undefined) {
            this._membershipMap[roomId] = {};
        }
        // Bans and invites do not mean the user exists.
        if (membership === "join" || membership === "leave") {
            this._registeredUsers.add(userId);
        }
        this._membershipMap[roomId][userId] = membership;
    }
    isUserRegistered(userId) {
        return this._registeredUsers.has(userId);
    }
}
module.exports = MembershipCache;
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