"use strict";
var __importDefault = (this && this.__importDefault) || function (mod) {
    return (mod && mod.__esModule) ? mod : { "default": mod };
};
Object.defineProperty(exports, "__esModule", { value: true });
exports.Socket = exports.RESERVED_EVENTS = void 0;
const socket_io_parser_1 = require("socket.io-parser");
const debug_1 = __importDefault(require("debug"));
const typed_events_1 = require("./typed-events");
const base64id_1 = __importDefault(require("base64id"));
const broadcast_operator_1 = require("./broadcast-operator");
const debug = (0, debug_1.default)("socket.io:socket");
exports.RESERVED_EVENTS = new Set([
    "connect",
    "connect_error",
    "disconnect",
    "disconnecting",
    "newListener",
    "removeListener",
]);
function noop() { }
/**
 * This is the main object for interacting with a client.
 *
 * A Socket belongs to a given {@link Namespace} and uses an underlying {@link Client} to communicate.
 *
 * Within each {@link Namespace}, you can also define arbitrary channels (called "rooms") that the {@link Socket} can
 * join and leave. That provides a convenient way to broadcast to a group of socket instances.
 *
 * @example
 * io.on("connection", (socket) => {
 *   console.log(`socket ${socket.id} connected`);
 *
 *   // send an event to the client
 *   socket.emit("foo", "bar");
 *
 *   socket.on("foobar", () => {
 *     // an event was received from the client
 *   });
 *
 *   // join the room named "room1"
 *   socket.join("room1");
 *
 *   // broadcast to everyone in the room named "room1"
 *   io.to("room1").emit("hello");
 *
 *   // upon disconnection
 *   socket.on("disconnect", (reason) => {
 *     console.log(`socket ${socket.id} disconnected due to ${reason}`);
 *   });
 * });
 */
class Socket extends typed_events_1.StrictEventEmitter {
    /**
     * Interface to a `Client` for a given `Namespace`.
     *
     * @param {Namespace} nsp
     * @param {Client} client
     * @param {Object} auth
     * @package
     */
    constructor(nsp, client, auth) {
        super();
        this.nsp = nsp;
        this.client = client;
        /**
         * Additional information that can be attached to the Socket instance and which will be used in the
         * {@link Server.fetchSockets()} method.
         */
        this.data = {};
        /**
         * Whether the socket is currently connected or not.
         *
         * @example
         * io.use((socket, next) => {
         *   console.log(socket.connected); // false
         *   next();
         * });
         *
         * io.on("connection", (socket) => {
         *   console.log(socket.connected); // true
         * });
         */
        this.connected = false;
        this.acks = new Map();
        this.fns = [];
        this.flags = {};
        this.server = nsp.server;
        this.adapter = this.nsp.adapter;
        if (client.conn.protocol === 3) {
            // @ts-ignore
            this.id = nsp.name !== "/" ? nsp.name + "#" + client.id : client.id;
        }
        else {
            this.id = base64id_1.default.generateId(); // don't reuse the Engine.IO id because it's sensitive information
        }
        this.handshake = this.buildHandshake(auth);
    }
    /**
     * Builds the `handshake` BC object
     *
     * @private
     */
    buildHandshake(auth) {
        return {
            headers: this.request.headers,
            time: new Date() + "",
            address: this.conn.remoteAddress,
            xdomain: !!this.request.headers.origin,
            // @ts-ignore
            secure: !!this.request.connection.encrypted,
            issued: +new Date(),
            url: this.request.url,
            // @ts-ignore
            query: this.request._query,
            auth,
        };
    }
    /**
     * Emits to this client.
     *
     * @example
     * io.on("connection", (socket) => {
     *   socket.emit("hello", "world");
     *
     *   // all serializable datastructures are supported (no need to call JSON.stringify)
     *   socket.emit("hello", 1, "2", { 3: ["4"], 5: Buffer.from([6]) });
     *
     *   // with an acknowledgement from the client
     *   socket.emit("hello", "world", (val) => {
     *     // ...
     *   });
     * });
     *
     * @return Always returns `true`.
     */
    emit(ev, ...args) {
        if (exports.RESERVED_EVENTS.has(ev)) {
            throw new Error(`"${String(ev)}" is a reserved event name`);
        }
        const data = [ev, ...args];
        const packet = {
            type: socket_io_parser_1.PacketType.EVENT,
            data: data,
        };
        // access last argument to see if it's an ACK callback
        if (typeof data[data.length - 1] === "function") {
            const id = this.nsp._ids++;
            debug("emitting packet with ack id %d", id);
            this.registerAckCallback(id, data.pop());
            packet.id = id;
        }
        const flags = Object.assign({}, this.flags);
        this.flags = {};
        this.notifyOutgoingListeners(packet);
        this.packet(packet, flags);
        return true;
    }
    /**
     * @private
     */
    registerAckCallback(id, ack) {
        const timeout = this.flags.timeout;
        if (timeout === undefined) {
            this.acks.set(id, ack);
            return;
        }
        const timer = setTimeout(() => {
            debug("event with ack id %d has timed out after %d ms", id, timeout);
            this.acks.delete(id);
            ack.call(this, new Error("operation has timed out"));
        }, timeout);
        this.acks.set(id, (...args) => {
            clearTimeout(timer);
            ack.apply(this, [null, ...args]);
        });
    }
    /**
     * Targets a room when broadcasting.
     *
     * @example
     * io.on("connection", (socket) => {
     *   // the “foo” event will be broadcast to all connected clients in the “room-101” room, except this socket
     *   socket.to("room-101").emit("foo", "bar");
     *
     *   // the code above is equivalent to:
     *   io.to("room-101").except(socket.id).emit("foo", "bar");
     *
     *   // with an array of rooms (a client will be notified at most once)
     *   socket.to(["room-101", "room-102"]).emit("foo", "bar");
     *
     *   // with multiple chained calls
     *   socket.to("room-101").to("room-102").emit("foo", "bar");
     * });
     *
     * @param room - a room, or an array of rooms
     * @return a new {@link BroadcastOperator} instance for chaining
     */
    to(room) {
        return this.newBroadcastOperator().to(room);
    }
    /**
     * Targets a room when broadcasting. Similar to `to()`, but might feel clearer in some cases:
     *
     * @example
     * io.on("connection", (socket) => {
     *   // disconnect all clients in the "room-101" room, except this socket
     *   socket.in("room-101").disconnectSockets();
     * });
     *
     * @param room - a room, or an array of rooms
     * @return a new {@link BroadcastOperator} instance for chaining
     */
    in(room) {
        return this.newBroadcastOperator().in(room);
    }
    /**
     * Excludes a room when broadcasting.
     *
     * @example
     * io.on("connection", (socket) => {
     *   // the "foo" event will be broadcast to all connected clients, except the ones that are in the "room-101" room
     *   // and this socket
     *   socket.except("room-101").emit("foo", "bar");
     *
     *   // with an array of rooms
     *   socket.except(["room-101", "room-102"]).emit("foo", "bar");
     *
     *   // with multiple chained calls
     *   socket.except("room-101").except("room-102").emit("foo", "bar");
     * });
     *
     * @param room - a room, or an array of rooms
     * @return a new {@link BroadcastOperator} instance for chaining
     */
    except(room) {
        return this.newBroadcastOperator().except(room);
    }
    /**
     * Sends a `message` event.
     *
     * This method mimics the WebSocket.send() method.
     *
     * @see https://developer.mozilla.org/en-US/docs/Web/API/WebSocket/send
     *
     * @example
     * io.on("connection", (socket) => {
     *   socket.send("hello");
     *
     *   // this is equivalent to
     *   socket.emit("message", "hello");
     * });
     *
     * @return self
     */
    send(...args) {
        this.emit("message", ...args);
        return this;
    }
    /**
     * Sends a `message` event. Alias of {@link send}.
     *
     * @return self
     */
    write(...args) {
        this.emit("message", ...args);
        return this;
    }
    /**
     * Writes a packet.
     *
     * @param {Object} packet - packet object
     * @param {Object} opts - options
     * @private
     */
    packet(packet, opts = {}) {
        packet.nsp = this.nsp.name;
        opts.compress = false !== opts.compress;
        this.client._packet(packet, opts);
    }
    /**
     * Joins a room.
     *
     * @example
     * io.on("connection", (socket) => {
     *   // join a single room
     *   socket.join("room1");
     *
     *   // join multiple rooms
     *   socket.join(["room1", "room2"]);
     * });
     *
     * @param {String|Array} rooms - room or array of rooms
     * @return a Promise or nothing, depending on the adapter
     */
    join(rooms) {
        debug("join room %s", rooms);
        return this.adapter.addAll(this.id, new Set(Array.isArray(rooms) ? rooms : [rooms]));
    }
    /**
     * Leaves a room.
     *
     * @example
     * io.on("connection", (socket) => {
     *   // leave a single room
     *   socket.leave("room1");
     *
     *   // leave multiple rooms
     *   socket.leave("room1").leave("room2");
     * });
     *
     * @param {String} room
     * @return a Promise or nothing, depending on the adapter
     */
    leave(room) {
        debug("leave room %s", room);
        return this.adapter.del(this.id, room);
    }
    /**
     * Leave all rooms.
     *
     * @private
     */
    leaveAll() {
        this.adapter.delAll(this.id);
    }
    /**
     * Called by `Namespace` upon successful
     * middleware execution (ie: authorization).
     * Socket is added to namespace array before
     * call to join, so adapters can access it.
     *
     * @private
     */
    _onconnect() {
        debug("socket connected - writing packet");
        this.connected = true;
        this.join(this.id);
        if (this.conn.protocol === 3) {
            this.packet({ type: socket_io_parser_1.PacketType.CONNECT });
        }
        else {
            this.packet({ type: socket_io_parser_1.PacketType.CONNECT, data: { sid: this.id } });
        }
    }
    /**
     * Called with each packet. Called by `Client`.
     *
     * @param {Object} packet
     * @private
     */
    _onpacket(packet) {
        debug("got packet %j", packet);
        switch (packet.type) {
            case socket_io_parser_1.PacketType.EVENT:
                this.onevent(packet);
                break;
            case socket_io_parser_1.PacketType.BINARY_EVENT:
                this.onevent(packet);
                break;
            case socket_io_parser_1.PacketType.ACK:
                this.onack(packet);
                break;
            case socket_io_parser_1.PacketType.BINARY_ACK:
                this.onack(packet);
                break;
            case socket_io_parser_1.PacketType.DISCONNECT:
                this.ondisconnect();
                break;
        }
    }
    /**
     * Called upon event packet.
     *
     * @param {Packet} packet - packet object
     * @private
     */
    onevent(packet) {
        const args = packet.data || [];
        debug("emitting event %j", args);
        if (null != packet.id) {
            debug("attaching ack callback to event");
            args.push(this.ack(packet.id));
        }
        if (this._anyListeners && this._anyListeners.length) {
            const listeners = this._anyListeners.slice();
            for (const listener of listeners) {
                listener.apply(this, args);
            }
        }
        this.dispatch(args);
    }
    /**
     * Produces an ack callback to emit with an event.
     *
     * @param {Number} id - packet id
     * @private
     */
    ack(id) {
        const self = this;
        let sent = false;
        return function () {
            // prevent double callbacks
            if (sent)
                return;
            const args = Array.prototype.slice.call(arguments);
            debug("sending ack %j", args);
            self.packet({
                id: id,
                type: socket_io_parser_1.PacketType.ACK,
                data: args,
            });
            sent = true;
        };
    }
    /**
     * Called upon ack packet.
     *
     * @private
     */
    onack(packet) {
        const ack = this.acks.get(packet.id);
        if ("function" == typeof ack) {
            debug("calling ack %s with %j", packet.id, packet.data);
            ack.apply(this, packet.data);
            this.acks.delete(packet.id);
        }
        else {
            debug("bad ack %s", packet.id);
        }
    }
    /**
     * Called upon client disconnect packet.
     *
     * @private
     */
    ondisconnect() {
        debug("got disconnect packet");
        this._onclose("client namespace disconnect");
    }
    /**
     * Handles a client error.
     *
     * @private
     */
    _onerror(err) {
        if (this.listeners("error").length) {
            this.emitReserved("error", err);
        }
        else {
            console.error("Missing error handler on `socket`.");
            console.error(err.stack);
        }
    }
    /**
     * Called upon closing. Called by `Client`.
     *
     * @param {String} reason
     * @throw {Error} optional error object
     *
     * @private
     */
    _onclose(reason) {
        if (!this.connected)
            return this;
        debug("closing socket - reason %s", reason);
        this.emitReserved("disconnecting", reason);
        this._cleanup();
        this.nsp._remove(this);
        this.client._remove(this);
        this.connected = false;
        this.emitReserved("disconnect", reason);
        return;
    }
    /**
     * Makes the socket leave all the rooms it was part of and prevents it from joining any other room
     *
     * @private
     */
    _cleanup() {
        this.leaveAll();
        this.join = noop;
    }
    /**
     * Produces an `error` packet.
     *
     * @param {Object} err - error object
     *
     * @private
     */
    _error(err) {
        this.packet({ type: socket_io_parser_1.PacketType.CONNECT_ERROR, data: err });
    }
    /**
     * Disconnects this client.
     *
     * @example
     * io.on("connection", (socket) => {
     *   // disconnect this socket (the connection might be kept alive for other namespaces)
     *   socket.disconnect();
     *
     *   // disconnect this socket and close the underlying connection
     *   socket.disconnect(true);
     * })
     *
     * @param {Boolean} close - if `true`, closes the underlying connection
     * @return self
     */
    disconnect(close = false) {
        if (!this.connected)
            return this;
        if (close) {
            this.client._disconnect();
        }
        else {
            this.packet({ type: socket_io_parser_1.PacketType.DISCONNECT });
            this._onclose("server namespace disconnect");
        }
        return this;
    }
    /**
     * Sets the compress flag.
     *
     * @example
     * io.on("connection", (socket) => {
     *   socket.compress(false).emit("hello");
     * });
     *
     * @param {Boolean} compress - if `true`, compresses the sending data
     * @return {Socket} self
     */
    compress(compress) {
        this.flags.compress = compress;
        return this;
    }
    /**
     * Sets a modifier for a subsequent event emission that the event data may be lost if the client is not ready to
     * receive messages (because of network slowness or other issues, or because they’re connected through long polling
     * and is in the middle of a request-response cycle).
     *
     * @example
     * io.on("connection", (socket) => {
     *   socket.volatile.emit("hello"); // the client may or may not receive it
     * });
     *
     * @return {Socket} self
     */
    get volatile() {
        this.flags.volatile = true;
        return this;
    }
    /**
     * Sets a modifier for a subsequent event emission that the event data will only be broadcast to every sockets but the
     * sender.
     *
     * @example
     * io.on("connection", (socket) => {
     *   // the “foo” event will be broadcast to all connected clients, except this socket
     *   socket.broadcast.emit("foo", "bar");
     * });
     *
     * @return a new {@link BroadcastOperator} instance for chaining
     */
    get broadcast() {
        return this.newBroadcastOperator();
    }
    /**
     * Sets a modifier for a subsequent event emission that the event data will only be broadcast to the current node.
     *
     * @example
     * io.on("connection", (socket) => {
     *   // the “foo” event will be broadcast to all connected clients on this node, except this socket
     *   socket.local.emit("foo", "bar");
     * });
     *
     * @return a new {@link BroadcastOperator} instance for chaining
     */
    get local() {
        return this.newBroadcastOperator().local;
    }
    /**
     * Sets a modifier for a subsequent event emission that the callback will be called with an error when the
     * given number of milliseconds have elapsed without an acknowledgement from the client:
     *
     * @example
     * io.on("connection", (socket) => {
     *   socket.timeout(5000).emit("my-event", (err) => {
     *     if (err) {
     *       // the client did not acknowledge the event in the given delay
     *     }
     *   });
     * });
     *
     * @returns self
     */
    timeout(timeout) {
        this.flags.timeout = timeout;
        return this;
    }
    /**
     * Dispatch incoming event to socket listeners.
     *
     * @param {Array} event - event that will get emitted
     * @private
     */
    dispatch(event) {
        debug("dispatching an event %j", event);
        this.run(event, (err) => {
            process.nextTick(() => {
                if (err) {
                    return this._onerror(err);
                }
                if (this.connected) {
                    super.emitUntyped.apply(this, event);
                }
                else {
                    debug("ignore packet received after disconnection");
                }
            });
        });
    }
    /**
     * Sets up socket middleware.
     *
     * @example
     * io.on("connection", (socket) => {
     *   socket.use(([event, ...args], next) => {
     *     if (isUnauthorized(event)) {
     *       return next(new Error("unauthorized event"));
     *     }
     *     // do not forget to call next
     *     next();
     *   });
     *
     *   socket.on("error", (err) => {
     *     if (err && err.message === "unauthorized event") {
     *       socket.disconnect();
     *     }
     *   });
     * });
     *
     * @param {Function} fn - middleware function (event, next)
     * @return {Socket} self
     */
    use(fn) {
        this.fns.push(fn);
        return this;
    }
    /**
     * Executes the middleware for an incoming event.
     *
     * @param {Array} event - event that will get emitted
     * @param {Function} fn - last fn call in the middleware
     * @private
     */
    run(event, fn) {
        const fns = this.fns.slice(0);
        if (!fns.length)
            return fn(null);
        function run(i) {
            fns[i](event, function (err) {
                // upon error, short-circuit
                if (err)
                    return fn(err);
                // if no middleware left, summon callback
                if (!fns[i + 1])
                    return fn(null);
                // go on to next
                run(i + 1);
            });
        }
        run(0);
    }
    /**
     * Whether the socket is currently disconnected
     */
    get disconnected() {
        return !this.connected;
    }
    /**
     * A reference to the request that originated the underlying Engine.IO Socket.
     */
    get request() {
        return this.client.request;
    }
    /**
     * A reference to the underlying Client transport connection (Engine.IO Socket object).
     *
     * @example
     * io.on("connection", (socket) => {
     *   console.log(socket.conn.transport.name); // prints "polling" or "websocket"
     *
     *   socket.conn.once("upgrade", () => {
     *     console.log(socket.conn.transport.name); // prints "websocket"
     *   });
     * });
     */
    get conn() {
        return this.client.conn;
    }
    /**
     * Returns the rooms the socket is currently in.
     *
     * @example
     * io.on("connection", (socket) => {
     *   console.log(socket.rooms); // Set { <socket.id> }
     *
     *   socket.join("room1");
     *
     *   console.log(socket.rooms); // Set { <socket.id>, "room1" }
     * });
     */
    get rooms() {
        return this.adapter.socketRooms(this.id) || new Set();
    }
    /**
     * Adds a listener that will be fired when any event is received. The event name is passed as the first argument to
     * the callback.
     *
     * @example
     * io.on("connection", (socket) => {
     *   socket.onAny((event, ...args) => {
     *     console.log(`got event ${event}`);
     *   });
     * });
     *
     * @param listener
     */
    onAny(listener) {
        this._anyListeners = this._anyListeners || [];
        this._anyListeners.push(listener);
        return this;
    }
    /**
     * Adds a listener that will be fired when any event is received. The event name is passed as the first argument to
     * the callback. The listener is added to the beginning of the listeners array.
     *
     * @param listener
     */
    prependAny(listener) {
        this._anyListeners = this._anyListeners || [];
        this._anyListeners.unshift(listener);
        return this;
    }
    /**
     * Removes the listener that will be fired when any event is received.
     *
     * @example
     * io.on("connection", (socket) => {
     *   const catchAllListener = (event, ...args) => {
     *     console.log(`got event ${event}`);
     *   }
     *
     *   socket.onAny(catchAllListener);
     *
     *   // remove a specific listener
     *   socket.offAny(catchAllListener);
     *
     *   // or remove all listeners
     *   socket.offAny();
     * });
     *
     * @param listener
     */
    offAny(listener) {
        if (!this._anyListeners) {
            return this;
        }
        if (listener) {
            const listeners = this._anyListeners;
            for (let i = 0; i < listeners.length; i++) {
                if (listener === listeners[i]) {
                    listeners.splice(i, 1);
                    return this;
                }
            }
        }
        else {
            this._anyListeners = [];
        }
        return this;
    }
    /**
     * Returns an array of listeners that are listening for any event that is specified. This array can be manipulated,
     * e.g. to remove listeners.
     */
    listenersAny() {
        return this._anyListeners || [];
    }
    /**
     * Adds a listener that will be fired when any event is sent. The event name is passed as the first argument to
     * the callback.
     *
     * Note: acknowledgements sent to the client are not included.
     *
     * @example
     * io.on("connection", (socket) => {
     *   socket.onAnyOutgoing((event, ...args) => {
     *     console.log(`sent event ${event}`);
     *   });
     * });
     *
     * @param listener
     */
    onAnyOutgoing(listener) {
        this._anyOutgoingListeners = this._anyOutgoingListeners || [];
        this._anyOutgoingListeners.push(listener);
        return this;
    }
    /**
     * Adds a listener that will be fired when any event is emitted. The event name is passed as the first argument to the
     * callback. The listener is added to the beginning of the listeners array.
     *
     * @example
     * io.on("connection", (socket) => {
     *   socket.prependAnyOutgoing((event, ...args) => {
     *     console.log(`sent event ${event}`);
     *   });
     * });
     *
     * @param listener
     */
    prependAnyOutgoing(listener) {
        this._anyOutgoingListeners = this._anyOutgoingListeners || [];
        this._anyOutgoingListeners.unshift(listener);
        return this;
    }
    /**
     * Removes the listener that will be fired when any event is sent.
     *
     * @example
     * io.on("connection", (socket) => {
     *   const catchAllListener = (event, ...args) => {
     *     console.log(`sent event ${event}`);
     *   }
     *
     *   socket.onAnyOutgoing(catchAllListener);
     *
     *   // remove a specific listener
     *   socket.offAnyOutgoing(catchAllListener);
     *
     *   // or remove all listeners
     *   socket.offAnyOutgoing();
     * });
     *
     * @param listener - the catch-all listener
     */
    offAnyOutgoing(listener) {
        if (!this._anyOutgoingListeners) {
            return this;
        }
        if (listener) {
            const listeners = this._anyOutgoingListeners;
            for (let i = 0; i < listeners.length; i++) {
                if (listener === listeners[i]) {
                    listeners.splice(i, 1);
                    return this;
                }
            }
        }
        else {
            this._anyOutgoingListeners = [];
        }
        return this;
    }
    /**
     * Returns an array of listeners that are listening for any event that is specified. This array can be manipulated,
     * e.g. to remove listeners.
     */
    listenersAnyOutgoing() {
        return this._anyOutgoingListeners || [];
    }
    /**
     * Notify the listeners for each packet sent (emit or broadcast)
     *
     * @param packet
     *
     * @private
     */
    notifyOutgoingListeners(packet) {
        if (this._anyOutgoingListeners && this._anyOutgoingListeners.length) {
            const listeners = this._anyOutgoingListeners.slice();
            for (const listener of listeners) {
                listener.apply(this, packet.data);
            }
        }
    }
    newBroadcastOperator() {
        const flags = Object.assign({}, this.flags);
        this.flags = {};
        return new broadcast_operator_1.BroadcastOperator(this.adapter, new Set(), new Set([this.id]), flags);
    }
}
exports.Socket = Socket;
