'use strict';

var HandshakeProtocol = require('./HandshakeProtocol.js');
var Errors = require('./Errors.js');
var IHubProtocol = require('./IHubProtocol.js');
var ILogger = require('./ILogger.js');
var Subject = require('./Subject.js');
var Utils = require('./Utils.js');
var MessageBuffer = require('./MessageBuffer.js');

// Licensed to the .NET Foundation under one or more agreements.
// The .NET Foundation licenses this file to you under the MIT license.
const DEFAULT_TIMEOUT_IN_MS = 30 * 1000;
const DEFAULT_PING_INTERVAL_IN_MS = 15 * 1000;
const DEFAULT_STATEFUL_RECONNECT_BUFFER_SIZE = 100000;
/** Describes the current state of the {@link HubConnection} to the server. */
exports.HubConnectionState = void 0;
(function (HubConnectionState) {
    /** The hub connection is disconnected. */
    HubConnectionState["Disconnected"] = "Disconnected";
    /** The hub connection is connecting. */
    HubConnectionState["Connecting"] = "Connecting";
    /** The hub connection is connected. */
    HubConnectionState["Connected"] = "Connected";
    /** The hub connection is disconnecting. */
    HubConnectionState["Disconnecting"] = "Disconnecting";
    /** The hub connection is reconnecting. */
    HubConnectionState["Reconnecting"] = "Reconnecting";
})(exports.HubConnectionState || (exports.HubConnectionState = {}));
/** Represents a connection to a SignalR Hub. */
class HubConnection {
    /** @internal */
    // Using a public static factory method means we can have a private constructor and an _internal_
    // create method that can be used by HubConnectionBuilder. An "internal" constructor would just
    // be stripped away and the '.d.ts' file would have no constructor, which is interpreted as a
    // public parameter-less constructor.
    static create(connection, logger, protocol, reconnectPolicy, serverTimeoutInMilliseconds, keepAliveIntervalInMilliseconds, statefulReconnectBufferSize) {
        return new HubConnection(connection, logger, protocol, reconnectPolicy, serverTimeoutInMilliseconds, keepAliveIntervalInMilliseconds, statefulReconnectBufferSize);
    }
    constructor(connection, logger, protocol, reconnectPolicy, serverTimeoutInMilliseconds, keepAliveIntervalInMilliseconds, statefulReconnectBufferSize) {
        this._nextKeepAlive = 0;
        this._freezeEventListener = () => {
            this._logger.log(ILogger.LogLevel.Warning, "The page is being frozen, this will likely lead to the connection being closed and messages being lost. For more information see the docs at https://learn.microsoft.com/aspnet/core/signalr/javascript-client#bsleep");
        };
        Utils.Arg.isRequired(connection, "connection");
        Utils.Arg.isRequired(logger, "logger");
        Utils.Arg.isRequired(protocol, "protocol");
        this.serverTimeoutInMilliseconds = serverTimeoutInMilliseconds !== null && serverTimeoutInMilliseconds !== void 0 ? serverTimeoutInMilliseconds : DEFAULT_TIMEOUT_IN_MS;
        this.keepAliveIntervalInMilliseconds = keepAliveIntervalInMilliseconds !== null && keepAliveIntervalInMilliseconds !== void 0 ? keepAliveIntervalInMilliseconds : DEFAULT_PING_INTERVAL_IN_MS;
        this._statefulReconnectBufferSize = statefulReconnectBufferSize !== null && statefulReconnectBufferSize !== void 0 ? statefulReconnectBufferSize : DEFAULT_STATEFUL_RECONNECT_BUFFER_SIZE;
        this._logger = logger;
        this._protocol = protocol;
        this.connection = connection;
        this._reconnectPolicy = reconnectPolicy;
        this._handshakeProtocol = new HandshakeProtocol.HandshakeProtocol();
        this.connection.onreceive = (data) => this._processIncomingData(data);
        this.connection.onclose = (error) => this._connectionClosed(error);
        this._callbacks = {};
        this._methods = {};
        this._closedCallbacks = [];
        this._reconnectingCallbacks = [];
        this._reconnectedCallbacks = [];
        this._invocationId = 0;
        this._receivedHandshakeResponse = false;
        this._connectionState = exports.HubConnectionState.Disconnected;
        this._connectionStarted = false;
        this._cachedPingMessage = this._protocol.writeMessage({ type: IHubProtocol.MessageType.Ping });
    }
    /** Indicates the state of the {@link HubConnection} to the server. */
    get state() {
        return this._connectionState;
    }
    /** Represents the connection id of the {@link HubConnection} on the server. The connection id will be null when the connection is either
     *  in the disconnected state or if the negotiation step was skipped.
     */
    get connectionId() {
        return this.connection ? (this.connection.connectionId || null) : null;
    }
    /** Indicates the url of the {@link HubConnection} to the server. */
    get baseUrl() {
        return this.connection.baseUrl || "";
    }
    /**
     * Sets a new url for the HubConnection. Note that the url can only be changed when the connection is in either the Disconnected or
     * Reconnecting states.
     * @param {string} url The url to connect to.
     */
    set baseUrl(url) {
        if (this._connectionState !== exports.HubConnectionState.Disconnected && this._connectionState !== exports.HubConnectionState.Reconnecting) {
            throw new Error("The HubConnection must be in the Disconnected or Reconnecting state to change the url.");
        }
        if (!url) {
            throw new Error("The HubConnection url must be a valid url.");
        }
        this.connection.baseUrl = url;
    }
    /** Starts the connection.
     *
     * @returns {Promise<void>} A Promise that resolves when the connection has been successfully established, or rejects with an error.
     */
    start() {
        this._startPromise = this._startWithStateTransitions();
        return this._startPromise;
    }
    async _startWithStateTransitions() {
        if (this._connectionState !== exports.HubConnectionState.Disconnected) {
            return Promise.reject(new Error("Cannot start a HubConnection that is not in the 'Disconnected' state."));
        }
        this._connectionState = exports.HubConnectionState.Connecting;
        this._logger.log(ILogger.LogLevel.Debug, "Starting HubConnection.");
        try {
            await this._startInternal();
            if (Utils.Platform.isBrowser) {
                // Log when the browser freezes the tab so users know why their connection unexpectedly stopped working
                window.document.addEventListener("freeze", this._freezeEventListener);
            }
            this._connectionState = exports.HubConnectionState.Connected;
            this._connectionStarted = true;
            this._logger.log(ILogger.LogLevel.Debug, "HubConnection connected successfully.");
        }
        catch (e) {
            this._connectionState = exports.HubConnectionState.Disconnected;
            this._logger.log(ILogger.LogLevel.Debug, `HubConnection failed to start successfully because of error '${e}'.`);
            return Promise.reject(e);
        }
    }
    async _startInternal() {
        this._stopDuringStartError = undefined;
        this._receivedHandshakeResponse = false;
        // Set up the promise before any connection is (re)started otherwise it could race with received messages
        const handshakePromise = new Promise((resolve, reject) => {
            this._handshakeResolver = resolve;
            this._handshakeRejecter = reject;
        });
        await this.connection.start(this._protocol.transferFormat);
        try {
            let version = this._protocol.version;
            if (!this.connection.features.reconnect) {
                // Stateful Reconnect starts with HubProtocol version 2, newer clients connecting to older servers will fail to connect due to
                // the handshake only supporting version 1, so we will try to send version 1 during the handshake to keep old servers working.
                version = 1;
            }
            const handshakeRequest = {
                protocol: this._protocol.name,
                version,
            };
            this._logger.log(ILogger.LogLevel.Debug, "Sending handshake request.");
            await this._sendMessage(this._handshakeProtocol.writeHandshakeRequest(handshakeRequest));
            this._logger.log(ILogger.LogLevel.Information, `Using HubProtocol '${this._protocol.name}'.`);
            // defensively cleanup timeout in case we receive a message from the server before we finish start
            this._cleanupTimeout();
            this._resetTimeoutPeriod();
            this._resetKeepAliveInterval();
            await handshakePromise;
            // It's important to check the stopDuringStartError instead of just relying on the handshakePromise
            // being rejected on close, because this continuation can run after both the handshake completed successfully
            // and the connection was closed.
            if (this._stopDuringStartError) {
                // It's important to throw instead of returning a rejected promise, because we don't want to allow any state
                // transitions to occur between now and the calling code observing the exceptions. Returning a rejected promise
                // will cause the calling continuation to get scheduled to run later.
                // eslint-disable-next-line @typescript-eslint/no-throw-literal
                throw this._stopDuringStartError;
            }
            const useStatefulReconnect = this.connection.features.reconnect || false;
            if (useStatefulReconnect) {
                this._messageBuffer = new MessageBuffer.MessageBuffer(this._protocol, this.connection, this._statefulReconnectBufferSize);
                this.connection.features.disconnected = this._messageBuffer._disconnected.bind(this._messageBuffer);
                this.connection.features.resend = () => {
                    if (this._messageBuffer) {
                        return this._messageBuffer._resend();
                    }
                };
            }
            if (!this.connection.features.inherentKeepAlive) {
                await this._sendMessage(this._cachedPingMessage);
            }
        }
        catch (e) {
            this._logger.log(ILogger.LogLevel.Debug, `Hub handshake failed with error '${e}' during start(). Stopping HubConnection.`);
            this._cleanupTimeout();
            this._cleanupPingTimer();
            // HttpConnection.stop() should not complete until after the onclose callback is invoked.
            // This will transition the HubConnection to the disconnected state before HttpConnection.stop() completes.
            await this.connection.stop(e);
            throw e;
        }
    }
    /** Stops the connection.
     *
     * @returns {Promise<void>} A Promise that resolves when the connection has been successfully terminated, or rejects with an error.
     */
    async stop() {
        // Capture the start promise before the connection might be restarted in an onclose callback.
        const startPromise = this._startPromise;
        this.connection.features.reconnect = false;
        this._stopPromise = this._stopInternal();
        await this._stopPromise;
        try {
            // Awaiting undefined continues immediately
            await startPromise;
        }
        catch (e) {
            // This exception is returned to the user as a rejected Promise from the start method.
        }
    }
    _stopInternal(error) {
        if (this._connectionState === exports.HubConnectionState.Disconnected) {
            this._logger.log(ILogger.LogLevel.Debug, `Call to HubConnection.stop(${error}) ignored because it is already in the disconnected state.`);
            return Promise.resolve();
        }
        if (this._connectionState === exports.HubConnectionState.Disconnecting) {
            this._logger.log(ILogger.LogLevel.Debug, `Call to HttpConnection.stop(${error}) ignored because the connection is already in the disconnecting state.`);
            return this._stopPromise;
        }
        const state = this._connectionState;
        this._connectionState = exports.HubConnectionState.Disconnecting;
        this._logger.log(ILogger.LogLevel.Debug, "Stopping HubConnection.");
        if (this._reconnectDelayHandle) {
            // We're in a reconnect delay which means the underlying connection is currently already stopped.
            // Just clear the handle to stop the reconnect loop (which no one is waiting on thankfully) and
            // fire the onclose callbacks.
            this._logger.log(ILogger.LogLevel.Debug, "Connection stopped during reconnect delay. Done reconnecting.");
            clearTimeout(this._reconnectDelayHandle);
            this._reconnectDelayHandle = undefined;
            this._completeClose();
            return Promise.resolve();
        }
        if (state === exports.HubConnectionState.Connected) {
            // eslint-disable-next-line @typescript-eslint/no-floating-promises
            this._sendCloseMessage();
        }
        this._cleanupTimeout();
        this._cleanupPingTimer();
        this._stopDuringStartError = error || new Errors.AbortError("The connection was stopped before the hub handshake could complete.");
        // HttpConnection.stop() should not complete until after either HttpConnection.start() fails
        // or the onclose callback is invoked. The onclose callback will transition the HubConnection
        // to the disconnected state if need be before HttpConnection.stop() completes.
        return this.connection.stop(error);
    }
    async _sendCloseMessage() {
        try {
            await this._sendWithProtocol(this._createCloseMessage());
        }
        catch {
            // Ignore, this is a best effort attempt to let the server know the client closed gracefully.
        }
    }
    /** Invokes a streaming hub method on the server using the specified name and arguments.
     *
     * @typeparam T The type of the items returned by the server.
     * @param {string} methodName The name of the server method to invoke.
     * @param {any[]} args The arguments used to invoke the server method.
     * @returns {IStreamResult<T>} An object that yields results from the server as they are received.
     */
    stream(methodName, ...args) {
        const [streams, streamIds] = this._replaceStreamingParams(args);
        const invocationDescriptor = this._createStreamInvocation(methodName, args, streamIds);
        // eslint-disable-next-line prefer-const
        let promiseQueue;
        const subject = new Subject.Subject();
        subject.cancelCallback = () => {
            const cancelInvocation = this._createCancelInvocation(invocationDescriptor.invocationId);
            delete this._callbacks[invocationDescriptor.invocationId];
            return promiseQueue.then(() => {
                return this._sendWithProtocol(cancelInvocation);
            });
        };
        this._callbacks[invocationDescriptor.invocationId] = (invocationEvent, error) => {
            if (error) {
                subject.error(error);
                return;
            }
            else if (invocationEvent) {
                // invocationEvent will not be null when an error is not passed to the callback
                if (invocationEvent.type === IHubProtocol.MessageType.Completion) {
                    if (invocationEvent.error) {
                        subject.error(new Error(invocationEvent.error));
                    }
                    else {
                        subject.complete();
                    }
                }
                else {
                    subject.next((invocationEvent.item));
                }
            }
        };
        promiseQueue = this._sendWithProtocol(invocationDescriptor)
            .catch((e) => {
            subject.error(e);
            delete this._callbacks[invocationDescriptor.invocationId];
        });
        this._launchStreams(streams, promiseQueue);
        return subject;
    }
    _sendMessage(message) {
        this._resetKeepAliveInterval();
        return this.connection.send(message);
    }
    /**
     * Sends a js object to the server.
     * @param message The js object to serialize and send.
     */
    _sendWithProtocol(message) {
        if (this._messageBuffer) {
            return this._messageBuffer._send(message);
        }
        else {
            return this._sendMessage(this._protocol.writeMessage(message));
        }
    }
    /** Invokes a hub method on the server using the specified name and arguments. Does not wait for a response from the receiver.
     *
     * The Promise returned by this method resolves when the client has sent the invocation to the server. The server may still
     * be processing the invocation.
     *
     * @param {string} methodName The name of the server method to invoke.
     * @param {any[]} args The arguments used to invoke the server method.
     * @returns {Promise<void>} A Promise that resolves when the invocation has been successfully sent, or rejects with an error.
     */
    send(methodName, ...args) {
        const [streams, streamIds] = this._replaceStreamingParams(args);
        const sendPromise = this._sendWithProtocol(this._createInvocation(methodName, args, true, streamIds));
        this._launchStreams(streams, sendPromise);
        return sendPromise;
    }
    /** Invokes a hub method on the server using the specified name and arguments.
     *
     * The Promise returned by this method resolves when the server indicates it has finished invoking the method. When the promise
     * resolves, the server has finished invoking the method. If the server method returns a result, it is produced as the result of
     * resolving the Promise.
     *
     * @typeparam T The expected return type.
     * @param {string} methodName The name of the server method to invoke.
     * @param {any[]} args The arguments used to invoke the server method.
     * @returns {Promise<T>} A Promise that resolves with the result of the server method (if any), or rejects with an error.
     */
    invoke(methodName, ...args) {
        const [streams, streamIds] = this._replaceStreamingParams(args);
        const invocationDescriptor = this._createInvocation(methodName, args, false, streamIds);
        const p = new Promise((resolve, reject) => {
            // invocationId will always have a value for a non-blocking invocation
            this._callbacks[invocationDescriptor.invocationId] = (invocationEvent, error) => {
                if (error) {
                    reject(error);
                    return;
                }
                else if (invocationEvent) {
                    // invocationEvent will not be null when an error is not passed to the callback
                    if (invocationEvent.type === IHubProtocol.MessageType.Completion) {
                        if (invocationEvent.error) {
                            reject(new Error(invocationEvent.error));
                        }
                        else {
                            resolve(invocationEvent.result);
                        }
                    }
                    else {
                        reject(new Error(`Unexpected message type: ${invocationEvent.type}`));
                    }
                }
            };
            const promiseQueue = this._sendWithProtocol(invocationDescriptor)
                .catch((e) => {
                reject(e);
                // invocationId will always have a value for a non-blocking invocation
                delete this._callbacks[invocationDescriptor.invocationId];
            });
            this._launchStreams(streams, promiseQueue);
        });
        return p;
    }
    on(methodName, newMethod) {
        if (!methodName || !newMethod) {
            return;
        }
        methodName = methodName.toLowerCase();
        if (!this._methods[methodName]) {
            this._methods[methodName] = [];
        }
        // Preventing adding the same handler multiple times.
        if (this._methods[methodName].indexOf(newMethod) !== -1) {
            return;
        }
        this._methods[methodName].push(newMethod);
    }
    off(methodName, method) {
        if (!methodName) {
            return;
        }
        methodName = methodName.toLowerCase();
        const handlers = this._methods[methodName];
        if (!handlers) {
            return;
        }
        if (method) {
            const removeIdx = handlers.indexOf(method);
            if (removeIdx !== -1) {
                handlers.splice(removeIdx, 1);
                if (handlers.length === 0) {
                    delete this._methods[methodName];
                }
            }
        }
        else {
            delete this._methods[methodName];
        }
    }
    /** Registers a handler that will be invoked when the connection is closed.
     *
     * @param {Function} callback The handler that will be invoked when the connection is closed. Optionally receives a single argument containing the error that caused the connection to close (if any).
     */
    onclose(callback) {
        if (callback) {
            this._closedCallbacks.push(callback);
        }
    }
    /** Registers a handler that will be invoked when the connection starts reconnecting.
     *
     * @param {Function} callback The handler that will be invoked when the connection starts reconnecting. Optionally receives a single argument containing the error that caused the connection to start reconnecting (if any).
     */
    onreconnecting(callback) {
        if (callback) {
            this._reconnectingCallbacks.push(callback);
        }
    }
    /** Registers a handler that will be invoked when the connection successfully reconnects.
     *
     * @param {Function} callback The handler that will be invoked when the connection successfully reconnects.
     */
    onreconnected(callback) {
        if (callback) {
            this._reconnectedCallbacks.push(callback);
        }
    }
    _processIncomingData(data) {
        this._cleanupTimeout();
        if (!this._receivedHandshakeResponse) {
            data = this._processHandshakeResponse(data);
            this._receivedHandshakeResponse = true;
        }
        // Data may have all been read when processing handshake response
        if (data) {
            // Parse the messages
            const messages = this._protocol.parseMessages(data, this._logger);
            for (const message of messages) {
                if (this._messageBuffer && !this._messageBuffer._shouldProcessMessage(message)) {
                    // Don't process the message, we are either waiting for a SequenceMessage or received a duplicate message
                    continue;
                }
                switch (message.type) {
                    case IHubProtocol.MessageType.Invocation:
                        this._invokeClientMethod(message)
                            .catch((e) => {
                            this._logger.log(ILogger.LogLevel.Error, `Invoke client method threw error: ${Utils.getErrorString(e)}`);
                        });
                        break;
                    case IHubProtocol.MessageType.StreamItem:
                    case IHubProtocol.MessageType.Completion: {
                        const callback = this._callbacks[message.invocationId];
                        if (callback) {
                            if (message.type === IHubProtocol.MessageType.Completion) {
                                delete this._callbacks[message.invocationId];
                            }
                            try {
                                callback(message);
                            }
                            catch (e) {
                                this._logger.log(ILogger.LogLevel.Error, `Stream callback threw error: ${Utils.getErrorString(e)}`);
                            }
                        }
                        break;
                    }
                    case IHubProtocol.MessageType.Ping:
                        // Don't care about pings
                        break;
                    case IHubProtocol.MessageType.Close: {
                        this._logger.log(ILogger.LogLevel.Information, "Close message received from server.");
                        const error = message.error ? new Error("Server returned an error on close: " + message.error) : undefined;
                        if (message.allowReconnect === true) {
                            // It feels wrong not to await connection.stop() here, but processIncomingData is called as part of an onreceive callback which is not async,
                            // this is already the behavior for serverTimeout(), and HttpConnection.Stop() should catch and log all possible exceptions.
                            // eslint-disable-next-line @typescript-eslint/no-floating-promises
                            this.connection.stop(error);
                        }
                        else {
                            // We cannot await stopInternal() here, but subsequent calls to stop() will await this if stopInternal() is still ongoing.
                            this._stopPromise = this._stopInternal(error);
                        }
                        break;
                    }
                    case IHubProtocol.MessageType.Ack:
                        if (this._messageBuffer) {
                            this._messageBuffer._ack(message);
                        }
                        break;
                    case IHubProtocol.MessageType.Sequence:
                        if (this._messageBuffer) {
                            this._messageBuffer._resetSequence(message);
                        }
                        break;
                    default:
                        this._logger.log(ILogger.LogLevel.Warning, `Invalid message type: ${message.type}.`);
                        break;
                }
            }
        }
        this._resetTimeoutPeriod();
    }
    _processHandshakeResponse(data) {
        let responseMessage;
        let remainingData;
        try {
            [remainingData, responseMessage] = this._handshakeProtocol.parseHandshakeResponse(data);
        }
        catch (e) {
            const message = "Error parsing handshake response: " + e;
            this._logger.log(ILogger.LogLevel.Error, message);
            const error = new Error(message);
            this._handshakeRejecter(error);
            throw error;
        }
        if (responseMessage.error) {
            const message = "Server returned handshake error: " + responseMessage.error;
            this._logger.log(ILogger.LogLevel.Error, message);
            const error = new Error(message);
            this._handshakeRejecter(error);
            throw error;
        }
        else {
            this._logger.log(ILogger.LogLevel.Debug, "Server handshake complete.");
        }
        this._handshakeResolver();
        return remainingData;
    }
    _resetKeepAliveInterval() {
        if (this.connection.features.inherentKeepAlive) {
            return;
        }
        // Set the time we want the next keep alive to be sent
        // Timer will be setup on next message receive
        this._nextKeepAlive = new Date().getTime() + this.keepAliveIntervalInMilliseconds;
        this._cleanupPingTimer();
    }
    _resetTimeoutPeriod() {
        if (!this.connection.features || !this.connection.features.inherentKeepAlive) {
            // Set the timeout timer
            this._timeoutHandle = setTimeout(() => this.serverTimeout(), this.serverTimeoutInMilliseconds);
            // Immediately fire Keep-Alive ping if nextPing is overdue to avoid dependency on JS timers
            let nextPing = this._nextKeepAlive - new Date().getTime();
            if (nextPing < 0) {
                if (this._connectionState === exports.HubConnectionState.Connected) {
                    // eslint-disable-next-line @typescript-eslint/no-floating-promises
                    this._trySendPingMessage();
                }
                return;
            }
            // Set keepAlive timer if there isn't one
            if (this._pingServerHandle === undefined) {
                if (nextPing < 0) {
                    nextPing = 0;
                }
                // The timer needs to be set from a networking callback to avoid Chrome timer throttling from causing timers to run once a minute
                this._pingServerHandle = setTimeout(async () => {
                    if (this._connectionState === exports.HubConnectionState.Connected) {
                        await this._trySendPingMessage();
                    }
                }, nextPing);
            }
        }
    }
    // eslint-disable-next-line @typescript-eslint/naming-convention
    serverTimeout() {
        // The server hasn't talked to us in a while. It doesn't like us anymore ... :(
        // Terminate the connection, but we don't need to wait on the promise. This could trigger reconnecting.
        // eslint-disable-next-line @typescript-eslint/no-floating-promises
        this.connection.stop(new Error("Server timeout elapsed without receiving a message from the server."));
    }
    async _invokeClientMethod(invocationMessage) {
        const methodName = invocationMessage.target.toLowerCase();
        const methods = this._methods[methodName];
        if (!methods) {
            this._logger.log(ILogger.LogLevel.Warning, `No client method with the name '${methodName}' found.`);
            // No handlers provided by client but the server is expecting a response still, so we send an error
            if (invocationMessage.invocationId) {
                this._logger.log(ILogger.LogLevel.Warning, `No result given for '${methodName}' method and invocation ID '${invocationMessage.invocationId}'.`);
                await this._sendWithProtocol(this._createCompletionMessage(invocationMessage.invocationId, "Client didn't provide a result.", null));
            }
            return;
        }
        // Avoid issues with handlers removing themselves thus modifying the list while iterating through it
        const methodsCopy = methods.slice();
        // Server expects a response
        const expectsResponse = invocationMessage.invocationId ? true : false;
        // We preserve the last result or exception but still call all handlers
        let res;
        let exception;
        let completionMessage;
        for (const m of methodsCopy) {
            try {
                const prevRes = res;
                res = await m.apply(this, invocationMessage.arguments);
                if (expectsResponse && res && prevRes) {
                    this._logger.log(ILogger.LogLevel.Error, `Multiple results provided for '${methodName}'. Sending error to server.`);
                    completionMessage = this._createCompletionMessage(invocationMessage.invocationId, `Client provided multiple results.`, null);
                }
                // Ignore exception if we got a result after, the exception will be logged
                exception = undefined;
            }
            catch (e) {
                exception = e;
                this._logger.log(ILogger.LogLevel.Error, `A callback for the method '${methodName}' threw error '${e}'.`);
            }
        }
        if (completionMessage) {
            await this._sendWithProtocol(completionMessage);
        }
        else if (expectsResponse) {
            // If there is an exception that means either no result was given or a handler after a result threw
            if (exception) {
                completionMessage = this._createCompletionMessage(invocationMessage.invocationId, `${exception}`, null);
            }
            else if (res !== undefined) {
                completionMessage = this._createCompletionMessage(invocationMessage.invocationId, null, res);
            }
            else {
                this._logger.log(ILogger.LogLevel.Warning, `No result given for '${methodName}' method and invocation ID '${invocationMessage.invocationId}'.`);
                // Client didn't provide a result or throw from a handler, server expects a response so we send an error
                completionMessage = this._createCompletionMessage(invocationMessage.invocationId, "Client didn't provide a result.", null);
            }
            await this._sendWithProtocol(completionMessage);
        }
        else {
            if (res) {
                this._logger.log(ILogger.LogLevel.Error, `Result given for '${methodName}' method but server is not expecting a result.`);
            }
        }
    }
    _connectionClosed(error) {
        this._logger.log(ILogger.LogLevel.Debug, `HubConnection.connectionClosed(${error}) called while in state ${this._connectionState}.`);
        // Triggering this.handshakeRejecter is insufficient because it could already be resolved without the continuation having run yet.
        this._stopDuringStartError = this._stopDuringStartError || error || new Errors.AbortError("The underlying connection was closed before the hub handshake could complete.");
        // If the handshake is in progress, start will be waiting for the handshake promise, so we complete it.
        // If it has already completed, this should just noop.
        if (this._handshakeResolver) {
            this._handshakeResolver();
        }
        this._cancelCallbacksWithError(error || new Error("Invocation canceled due to the underlying connection being closed."));
        this._cleanupTimeout();
        this._cleanupPingTimer();
        if (this._connectionState === exports.HubConnectionState.Disconnecting) {
            this._completeClose(error);
        }
        else if (this._connectionState === exports.HubConnectionState.Connected && this._reconnectPolicy) {
            // eslint-disable-next-line @typescript-eslint/no-floating-promises
            this._reconnect(error);
        }
        else if (this._connectionState === exports.HubConnectionState.Connected) {
            this._completeClose(error);
        }
        // If none of the above if conditions were true were called the HubConnection must be in either:
        // 1. The Connecting state in which case the handshakeResolver will complete it and stopDuringStartError will fail it.
        // 2. The Reconnecting state in which case the handshakeResolver will complete it and stopDuringStartError will fail the current reconnect attempt
        //    and potentially continue the reconnect() loop.
        // 3. The Disconnected state in which case we're already done.
    }
    _completeClose(error) {
        if (this._connectionStarted) {
            this._connectionState = exports.HubConnectionState.Disconnected;
            this._connectionStarted = false;
            if (this._messageBuffer) {
                this._messageBuffer._dispose(error !== null && error !== void 0 ? error : new Error("Connection closed."));
                this._messageBuffer = undefined;
            }
            if (Utils.Platform.isBrowser) {
                window.document.removeEventListener("freeze", this._freezeEventListener);
            }
            try {
                this._closedCallbacks.forEach((c) => c.apply(this, [error]));
            }
            catch (e) {
                this._logger.log(ILogger.LogLevel.Error, `An onclose callback called with error '${error}' threw error '${e}'.`);
            }
        }
    }
    async _reconnect(error) {
        const reconnectStartTime = Date.now();
        let previousReconnectAttempts = 0;
        let retryError = error !== undefined ? error : new Error("Attempting to reconnect due to a unknown error.");
        let nextRetryDelay = this._getNextRetryDelay(previousReconnectAttempts, 0, retryError);
        if (nextRetryDelay === null) {
            this._logger.log(ILogger.LogLevel.Debug, "Connection not reconnecting because the IRetryPolicy returned null on the first reconnect attempt.");
            this._completeClose(error);
            return;
        }
        this._connectionState = exports.HubConnectionState.Reconnecting;
        if (error) {
            this._logger.log(ILogger.LogLevel.Information, `Connection reconnecting because of error '${error}'.`);
        }
        else {
            this._logger.log(ILogger.LogLevel.Information, "Connection reconnecting.");
        }
        if (this._reconnectingCallbacks.length !== 0) {
            try {
                this._reconnectingCallbacks.forEach((c) => c.apply(this, [error]));
            }
            catch (e) {
                this._logger.log(ILogger.LogLevel.Error, `An onreconnecting callback called with error '${error}' threw error '${e}'.`);
            }
            // Exit early if an onreconnecting callback called connection.stop().
            if (this._connectionState !== exports.HubConnectionState.Reconnecting) {
                this._logger.log(ILogger.LogLevel.Debug, "Connection left the reconnecting state in onreconnecting callback. Done reconnecting.");
                return;
            }
        }
        while (nextRetryDelay !== null) {
            this._logger.log(ILogger.LogLevel.Information, `Reconnect attempt number ${previousReconnectAttempts + 1} will start in ${nextRetryDelay} ms.`);
            await new Promise((resolve) => {
                this._reconnectDelayHandle = setTimeout(resolve, nextRetryDelay);
            });
            this._reconnectDelayHandle = undefined;
            if (this._connectionState !== exports.HubConnectionState.Reconnecting) {
                this._logger.log(ILogger.LogLevel.Debug, "Connection left the reconnecting state during reconnect delay. Done reconnecting.");
                return;
            }
            try {
                await this._startInternal();
                this._connectionState = exports.HubConnectionState.Connected;
                this._logger.log(ILogger.LogLevel.Information, "HubConnection reconnected successfully.");
                if (this._reconnectedCallbacks.length !== 0) {
                    try {
                        this._reconnectedCallbacks.forEach((c) => c.apply(this, [this.connection.connectionId]));
                    }
                    catch (e) {
                        this._logger.log(ILogger.LogLevel.Error, `An onreconnected callback called with connectionId '${this.connection.connectionId}; threw error '${e}'.`);
                    }
                }
                return;
            }
            catch (e) {
                this._logger.log(ILogger.LogLevel.Information, `Reconnect attempt failed because of error '${e}'.`);
                if (this._connectionState !== exports.HubConnectionState.Reconnecting) {
                    this._logger.log(ILogger.LogLevel.Debug, `Connection moved to the '${this._connectionState}' from the reconnecting state during reconnect attempt. Done reconnecting.`);
                    // The TypeScript compiler thinks that connectionState must be Connected here. The TypeScript compiler is wrong.
                    if (this._connectionState === exports.HubConnectionState.Disconnecting) {
                        this._completeClose();
                    }
                    return;
                }
                previousReconnectAttempts++;
                retryError = e instanceof Error ? e : new Error(e.toString());
                nextRetryDelay = this._getNextRetryDelay(previousReconnectAttempts, Date.now() - reconnectStartTime, retryError);
            }
        }
        this._logger.log(ILogger.LogLevel.Information, `Reconnect retries have been exhausted after ${Date.now() - reconnectStartTime} ms and ${previousReconnectAttempts} failed attempts. Connection disconnecting.`);
        this._completeClose();
    }
    _getNextRetryDelay(previousRetryCount, elapsedMilliseconds, retryReason) {
        try {
            return this._reconnectPolicy.nextRetryDelayInMilliseconds({
                elapsedMilliseconds,
                previousRetryCount,
                retryReason,
            });
        }
        catch (e) {
            this._logger.log(ILogger.LogLevel.Error, `IRetryPolicy.nextRetryDelayInMilliseconds(${previousRetryCount}, ${elapsedMilliseconds}) threw error '${e}'.`);
            return null;
        }
    }
    _cancelCallbacksWithError(error) {
        const callbacks = this._callbacks;
        this._callbacks = {};
        Object.keys(callbacks)
            .forEach((key) => {
            const callback = callbacks[key];
            try {
                callback(null, error);
            }
            catch (e) {
                this._logger.log(ILogger.LogLevel.Error, `Stream 'error' callback called with '${error}' threw error: ${Utils.getErrorString(e)}`);
            }
        });
    }
    _cleanupPingTimer() {
        if (this._pingServerHandle) {
            clearTimeout(this._pingServerHandle);
            this._pingServerHandle = undefined;
        }
    }
    _cleanupTimeout() {
        if (this._timeoutHandle) {
            clearTimeout(this._timeoutHandle);
        }
    }
    _createInvocation(methodName, args, nonblocking, streamIds) {
        if (nonblocking) {
            if (streamIds.length !== 0) {
                return {
                    target: methodName,
                    arguments: args,
                    streamIds,
                    type: IHubProtocol.MessageType.Invocation,
                };
            }
            else {
                return {
                    target: methodName,
                    arguments: args,
                    type: IHubProtocol.MessageType.Invocation,
                };
            }
        }
        else {
            const invocationId = this._invocationId;
            this._invocationId++;
            if (streamIds.length !== 0) {
                return {
                    target: methodName,
                    arguments: args,
                    invocationId: invocationId.toString(),
                    streamIds,
                    type: IHubProtocol.MessageType.Invocation,
                };
            }
            else {
                return {
                    target: methodName,
                    arguments: args,
                    invocationId: invocationId.toString(),
                    type: IHubProtocol.MessageType.Invocation,
                };
            }
        }
    }
    _launchStreams(streams, promiseQueue) {
        if (streams.length === 0) {
            return;
        }
        // Synchronize stream data so they arrive in-order on the server
        if (!promiseQueue) {
            promiseQueue = Promise.resolve();
        }
        // We want to iterate over the keys, since the keys are the stream ids
        // eslint-disable-next-line guard-for-in
        for (const streamId in streams) {
            streams[streamId].subscribe({
                complete: () => {
                    promiseQueue = promiseQueue.then(() => this._sendWithProtocol(this._createCompletionMessage(streamId)));
                },
                error: (err) => {
                    let message;
                    if (err instanceof Error) {
                        message = err.message;
                    }
                    else if (err && err.toString) {
                        message = err.toString();
                    }
                    else {
                        message = "Unknown error";
                    }
                    promiseQueue = promiseQueue.then(() => this._sendWithProtocol(this._createCompletionMessage(streamId, message)));
                },
                next: (item) => {
                    promiseQueue = promiseQueue.then(() => this._sendWithProtocol(this._createStreamItemMessage(streamId, item)));
                },
            });
        }
    }
    _replaceStreamingParams(args) {
        const streams = [];
        const streamIds = [];
        for (let i = 0; i < args.length; i++) {
            const argument = args[i];
            if (this._isObservable(argument)) {
                const streamId = this._invocationId;
                this._invocationId++;
                // Store the stream for later use
                streams[streamId] = argument;
                streamIds.push(streamId.toString());
                // remove stream from args
                args.splice(i, 1);
            }
        }
        return [streams, streamIds];
    }
    _isObservable(arg) {
        // This allows other stream implementations to just work (like rxjs)
        return arg && arg.subscribe && typeof arg.subscribe === "function";
    }
    _createStreamInvocation(methodName, args, streamIds) {
        const invocationId = this._invocationId;
        this._invocationId++;
        if (streamIds.length !== 0) {
            return {
                target: methodName,
                arguments: args,
                invocationId: invocationId.toString(),
                streamIds,
                type: IHubProtocol.MessageType.StreamInvocation,
            };
        }
        else {
            return {
                target: methodName,
                arguments: args,
                invocationId: invocationId.toString(),
                type: IHubProtocol.MessageType.StreamInvocation,
            };
        }
    }
    _createCancelInvocation(id) {
        return {
            invocationId: id,
            type: IHubProtocol.MessageType.CancelInvocation,
        };
    }
    _createStreamItemMessage(id, item) {
        return {
            invocationId: id,
            item,
            type: IHubProtocol.MessageType.StreamItem,
        };
    }
    _createCompletionMessage(id, error, result) {
        if (error) {
            return {
                error,
                invocationId: id,
                type: IHubProtocol.MessageType.Completion,
            };
        }
        return {
            invocationId: id,
            result,
            type: IHubProtocol.MessageType.Completion,
        };
    }
    _createCloseMessage() {
        return { type: IHubProtocol.MessageType.Close };
    }
    async _trySendPingMessage() {
        try {
            await this._sendMessage(this._cachedPingMessage);
        }
        catch {
            // We don't care about the error. It should be seen elsewhere in the client.
            // The connection is probably in a bad or closed state now, cleanup the timer so it stops triggering
            this._cleanupPingTimer();
        }
    }
}

exports.HubConnection = HubConnection;
//# sourceMappingURL=HubConnection.js.map
