"use strict";
/* --------------------------------------------------------------------------------------------
 * Copyright (c) Microsoft Corporation. All rights reserved.
 * Licensed under the MIT License. See License.txt in the project root for license information.
 * ------------------------------------------------------------------------------------------ */
Object.defineProperty(exports, "__esModule", { value: true });
exports.createMessageConnection = exports.ConnectionOptions = exports.MessageStrategy = exports.CancellationStrategy = exports.CancellationSenderStrategy = exports.CancellationReceiverStrategy = exports.RequestCancellationReceiverStrategy = exports.IdCancellationReceiverStrategy = exports.ConnectionStrategy = exports.ConnectionError = exports.ConnectionErrors = exports.LogTraceNotification = exports.SetTraceNotification = exports.TraceFormat = exports.TraceValues = exports.Trace = exports.NullLogger = exports.ProgressType = exports.ProgressToken = void 0;
const ral_1 = require("./ral");
const Is = require("./is");
const messages_1 = require("./messages");
const linkedMap_1 = require("./linkedMap");
const events_1 = require("./events");
const cancellation_1 = require("./cancellation");
var CancelNotification;
(function (CancelNotification) {
    CancelNotification.type = new messages_1.NotificationType('$/cancelRequest');
})(CancelNotification || (CancelNotification = {}));
var ProgressToken;
(function (ProgressToken) {
    function is(value) {
        return typeof value === 'string' || typeof value === 'number';
    }
    ProgressToken.is = is;
})(ProgressToken || (exports.ProgressToken = ProgressToken = {}));
var ProgressNotification;
(function (ProgressNotification) {
    ProgressNotification.type = new messages_1.NotificationType('$/progress');
})(ProgressNotification || (ProgressNotification = {}));
class ProgressType {
    constructor() {
    }
}
exports.ProgressType = ProgressType;
var StarRequestHandler;
(function (StarRequestHandler) {
    function is(value) {
        return Is.func(value);
    }
    StarRequestHandler.is = is;
})(StarRequestHandler || (StarRequestHandler = {}));
exports.NullLogger = Object.freeze({
    error: () => { },
    warn: () => { },
    info: () => { },
    log: () => { }
});
var Trace;
(function (Trace) {
    Trace[Trace["Off"] = 0] = "Off";
    Trace[Trace["Messages"] = 1] = "Messages";
    Trace[Trace["Compact"] = 2] = "Compact";
    Trace[Trace["Verbose"] = 3] = "Verbose";
})(Trace || (exports.Trace = Trace = {}));
var TraceValues;
(function (TraceValues) {
    /**
     * Turn tracing off.
     */
    TraceValues.Off = 'off';
    /**
     * Trace messages only.
     */
    TraceValues.Messages = 'messages';
    /**
     * Compact message tracing.
     */
    TraceValues.Compact = 'compact';
    /**
     * Verbose message tracing.
     */
    TraceValues.Verbose = 'verbose';
})(TraceValues || (exports.TraceValues = TraceValues = {}));
(function (Trace) {
    function fromString(value) {
        if (!Is.string(value)) {
            return Trace.Off;
        }
        value = value.toLowerCase();
        switch (value) {
            case 'off':
                return Trace.Off;
            case 'messages':
                return Trace.Messages;
            case 'compact':
                return Trace.Compact;
            case 'verbose':
                return Trace.Verbose;
            default:
                return Trace.Off;
        }
    }
    Trace.fromString = fromString;
    function toString(value) {
        switch (value) {
            case Trace.Off:
                return 'off';
            case Trace.Messages:
                return 'messages';
            case Trace.Compact:
                return 'compact';
            case Trace.Verbose:
                return 'verbose';
            default:
                return 'off';
        }
    }
    Trace.toString = toString;
})(Trace || (exports.Trace = Trace = {}));
var TraceFormat;
(function (TraceFormat) {
    TraceFormat["Text"] = "text";
    TraceFormat["JSON"] = "json";
})(TraceFormat || (exports.TraceFormat = TraceFormat = {}));
(function (TraceFormat) {
    function fromString(value) {
        if (!Is.string(value)) {
            return TraceFormat.Text;
        }
        value = value.toLowerCase();
        if (value === 'json') {
            return TraceFormat.JSON;
        }
        else {
            return TraceFormat.Text;
        }
    }
    TraceFormat.fromString = fromString;
})(TraceFormat || (exports.TraceFormat = TraceFormat = {}));
var SetTraceNotification;
(function (SetTraceNotification) {
    SetTraceNotification.type = new messages_1.NotificationType('$/setTrace');
})(SetTraceNotification || (exports.SetTraceNotification = SetTraceNotification = {}));
var LogTraceNotification;
(function (LogTraceNotification) {
    LogTraceNotification.type = new messages_1.NotificationType('$/logTrace');
})(LogTraceNotification || (exports.LogTraceNotification = LogTraceNotification = {}));
var ConnectionErrors;
(function (ConnectionErrors) {
    /**
     * The connection is closed.
     */
    ConnectionErrors[ConnectionErrors["Closed"] = 1] = "Closed";
    /**
     * The connection got disposed.
     */
    ConnectionErrors[ConnectionErrors["Disposed"] = 2] = "Disposed";
    /**
     * The connection is already in listening mode.
     */
    ConnectionErrors[ConnectionErrors["AlreadyListening"] = 3] = "AlreadyListening";
})(ConnectionErrors || (exports.ConnectionErrors = ConnectionErrors = {}));
class ConnectionError extends Error {
    constructor(code, message) {
        super(message);
        this.code = code;
        Object.setPrototypeOf(this, ConnectionError.prototype);
    }
}
exports.ConnectionError = ConnectionError;
var ConnectionStrategy;
(function (ConnectionStrategy) {
    function is(value) {
        const candidate = value;
        return candidate && Is.func(candidate.cancelUndispatched);
    }
    ConnectionStrategy.is = is;
})(ConnectionStrategy || (exports.ConnectionStrategy = ConnectionStrategy = {}));
var IdCancellationReceiverStrategy;
(function (IdCancellationReceiverStrategy) {
    function is(value) {
        const candidate = value;
        return candidate && (candidate.kind === undefined || candidate.kind === 'id') && Is.func(candidate.createCancellationTokenSource) && (candidate.dispose === undefined || Is.func(candidate.dispose));
    }
    IdCancellationReceiverStrategy.is = is;
})(IdCancellationReceiverStrategy || (exports.IdCancellationReceiverStrategy = IdCancellationReceiverStrategy = {}));
var RequestCancellationReceiverStrategy;
(function (RequestCancellationReceiverStrategy) {
    function is(value) {
        const candidate = value;
        return candidate && candidate.kind === 'request' && Is.func(candidate.createCancellationTokenSource) && (candidate.dispose === undefined || Is.func(candidate.dispose));
    }
    RequestCancellationReceiverStrategy.is = is;
})(RequestCancellationReceiverStrategy || (exports.RequestCancellationReceiverStrategy = RequestCancellationReceiverStrategy = {}));
var CancellationReceiverStrategy;
(function (CancellationReceiverStrategy) {
    CancellationReceiverStrategy.Message = Object.freeze({
        createCancellationTokenSource(_) {
            return new cancellation_1.CancellationTokenSource();
        }
    });
    function is(value) {
        return IdCancellationReceiverStrategy.is(value) || RequestCancellationReceiverStrategy.is(value);
    }
    CancellationReceiverStrategy.is = is;
})(CancellationReceiverStrategy || (exports.CancellationReceiverStrategy = CancellationReceiverStrategy = {}));
var CancellationSenderStrategy;
(function (CancellationSenderStrategy) {
    CancellationSenderStrategy.Message = Object.freeze({
        sendCancellation(conn, id) {
            return conn.sendNotification(CancelNotification.type, { id });
        },
        cleanup(_) { }
    });
    function is(value) {
        const candidate = value;
        return candidate && Is.func(candidate.sendCancellation) && Is.func(candidate.cleanup);
    }
    CancellationSenderStrategy.is = is;
})(CancellationSenderStrategy || (exports.CancellationSenderStrategy = CancellationSenderStrategy = {}));
var CancellationStrategy;
(function (CancellationStrategy) {
    CancellationStrategy.Message = Object.freeze({
        receiver: CancellationReceiverStrategy.Message,
        sender: CancellationSenderStrategy.Message
    });
    function is(value) {
        const candidate = value;
        return candidate && CancellationReceiverStrategy.is(candidate.receiver) && CancellationSenderStrategy.is(candidate.sender);
    }
    CancellationStrategy.is = is;
})(CancellationStrategy || (exports.CancellationStrategy = CancellationStrategy = {}));
var MessageStrategy;
(function (MessageStrategy) {
    function is(value) {
        const candidate = value;
        return candidate && Is.func(candidate.handleMessage);
    }
    MessageStrategy.is = is;
})(MessageStrategy || (exports.MessageStrategy = MessageStrategy = {}));
var ConnectionOptions;
(function (ConnectionOptions) {
    function is(value) {
        const candidate = value;
        return candidate && (CancellationStrategy.is(candidate.cancellationStrategy) || ConnectionStrategy.is(candidate.connectionStrategy) || MessageStrategy.is(candidate.messageStrategy));
    }
    ConnectionOptions.is = is;
})(ConnectionOptions || (exports.ConnectionOptions = ConnectionOptions = {}));
var ConnectionState;
(function (ConnectionState) {
    ConnectionState[ConnectionState["New"] = 1] = "New";
    ConnectionState[ConnectionState["Listening"] = 2] = "Listening";
    ConnectionState[ConnectionState["Closed"] = 3] = "Closed";
    ConnectionState[ConnectionState["Disposed"] = 4] = "Disposed";
})(ConnectionState || (ConnectionState = {}));
function createMessageConnection(messageReader, messageWriter, _logger, options) {
    const logger = _logger !== undefined ? _logger : exports.NullLogger;
    let sequenceNumber = 0;
    let notificationSequenceNumber = 0;
    let unknownResponseSequenceNumber = 0;
    const version = '2.0';
    let starRequestHandler = undefined;
    const requestHandlers = new Map();
    let starNotificationHandler = undefined;
    const notificationHandlers = new Map();
    const progressHandlers = new Map();
    let timer;
    let messageQueue = new linkedMap_1.LinkedMap();
    let responsePromises = new Map();
    let knownCanceledRequests = new Set();
    let requestTokens = new Map();
    let trace = Trace.Off;
    let traceFormat = TraceFormat.Text;
    let tracer;
    let state = ConnectionState.New;
    const errorEmitter = new events_1.Emitter();
    const closeEmitter = new events_1.Emitter();
    const unhandledNotificationEmitter = new events_1.Emitter();
    const unhandledProgressEmitter = new events_1.Emitter();
    const disposeEmitter = new events_1.Emitter();
    const cancellationStrategy = (options && options.cancellationStrategy) ? options.cancellationStrategy : CancellationStrategy.Message;
    function createRequestQueueKey(id) {
        if (id === null) {
            throw new Error(`Can't send requests with id null since the response can't be correlated.`);
        }
        return 'req-' + id.toString();
    }
    function createResponseQueueKey(id) {
        if (id === null) {
            return 'res-unknown-' + (++unknownResponseSequenceNumber).toString();
        }
        else {
            return 'res-' + id.toString();
        }
    }
    function createNotificationQueueKey() {
        return 'not-' + (++notificationSequenceNumber).toString();
    }
    function addMessageToQueue(queue, message) {
        if (messages_1.Message.isRequest(message)) {
            queue.set(createRequestQueueKey(message.id), message);
        }
        else if (messages_1.Message.isResponse(message)) {
            queue.set(createResponseQueueKey(message.id), message);
        }
        else {
            queue.set(createNotificationQueueKey(), message);
        }
    }
    function cancelUndispatched(_message) {
        return undefined;
    }
    function isListening() {
        return state === ConnectionState.Listening;
    }
    function isClosed() {
        return state === ConnectionState.Closed;
    }
    function isDisposed() {
        return state === ConnectionState.Disposed;
    }
    function closeHandler() {
        if (state === ConnectionState.New || state === ConnectionState.Listening) {
            state = ConnectionState.Closed;
            closeEmitter.fire(undefined);
        }
        // If the connection is disposed don't sent close events.
    }
    function readErrorHandler(error) {
        errorEmitter.fire([error, undefined, undefined]);
    }
    function writeErrorHandler(data) {
        errorEmitter.fire(data);
    }
    messageReader.onClose(closeHandler);
    messageReader.onError(readErrorHandler);
    messageWriter.onClose(closeHandler);
    messageWriter.onError(writeErrorHandler);
    function triggerMessageQueue() {
        if (timer || messageQueue.size === 0) {
            return;
        }
        timer = (0, ral_1.default)().timer.setImmediate(() => {
            timer = undefined;
            processMessageQueue();
        });
    }
    function handleMessage(message) {
        if (messages_1.Message.isRequest(message)) {
            handleRequest(message);
        }
        else if (messages_1.Message.isNotification(message)) {
            handleNotification(message);
        }
        else if (messages_1.Message.isResponse(message)) {
            handleResponse(message);
        }
        else {
            handleInvalidMessage(message);
        }
    }
    function processMessageQueue() {
        if (messageQueue.size === 0) {
            return;
        }
        const message = messageQueue.shift();
        try {
            const messageStrategy = options?.messageStrategy;
            if (MessageStrategy.is(messageStrategy)) {
                messageStrategy.handleMessage(message, handleMessage);
            }
            else {
                handleMessage(message);
            }
        }
        finally {
            triggerMessageQueue();
        }
    }
    const callback = (message) => {
        try {
            // We have received a cancellation message. Check if the message is still in the queue
            // and cancel it if allowed to do so.
            if (messages_1.Message.isNotification(message) && message.method === CancelNotification.type.method) {
                const cancelId = message.params.id;
                const key = createRequestQueueKey(cancelId);
                const toCancel = messageQueue.get(key);
                if (messages_1.Message.isRequest(toCancel)) {
                    const strategy = options?.connectionStrategy;
                    const response = (strategy && strategy.cancelUndispatched) ? strategy.cancelUndispatched(toCancel, cancelUndispatched) : cancelUndispatched(toCancel);
                    if (response && (response.error !== undefined || response.result !== undefined)) {
                        messageQueue.delete(key);
                        requestTokens.delete(cancelId);
                        response.id = toCancel.id;
                        traceSendingResponse(response, message.method, Date.now());
                        messageWriter.write(response).catch(() => logger.error(`Sending response for canceled message failed.`));
                        return;
                    }
                }
                const cancellationToken = requestTokens.get(cancelId);
                // The request is already running. Cancel the token
                if (cancellationToken !== undefined) {
                    cancellationToken.cancel();
                    traceReceivedNotification(message);
                    return;
                }
                else {
                    // Remember the cancel but still queue the message to
                    // clean up state in process message.
                    knownCanceledRequests.add(cancelId);
                }
            }
            addMessageToQueue(messageQueue, message);
        }
        finally {
            triggerMessageQueue();
        }
    };
    function handleRequest(requestMessage) {
        if (isDisposed()) {
            // we return here silently since we fired an event when the
            // connection got disposed.
            return;
        }
        function reply(resultOrError, method, startTime) {
            const message = {
                jsonrpc: version,
                id: requestMessage.id
            };
            if (resultOrError instanceof messages_1.ResponseError) {
                message.error = resultOrError.toJson();
            }
            else {
                message.result = resultOrError === undefined ? null : resultOrError;
            }
            traceSendingResponse(message, method, startTime);
            messageWriter.write(message).catch(() => logger.error(`Sending response failed.`));
        }
        function replyError(error, method, startTime) {
            const message = {
                jsonrpc: version,
                id: requestMessage.id,
                error: error.toJson()
            };
            traceSendingResponse(message, method, startTime);
            messageWriter.write(message).catch(() => logger.error(`Sending response failed.`));
        }
        function replySuccess(result, method, startTime) {
            // The JSON RPC defines that a response must either have a result or an error
            // So we can't treat undefined as a valid response result.
            if (result === undefined) {
                result = null;
            }
            const message = {
                jsonrpc: version,
                id: requestMessage.id,
                result: result
            };
            traceSendingResponse(message, method, startTime);
            messageWriter.write(message).catch(() => logger.error(`Sending response failed.`));
        }
        traceReceivedRequest(requestMessage);
        const element = requestHandlers.get(requestMessage.method);
        let type;
        let requestHandler;
        if (element) {
            type = element.type;
            requestHandler = element.handler;
        }
        const startTime = Date.now();
        if (requestHandler || starRequestHandler) {
            const tokenKey = requestMessage.id ?? String(Date.now()); //
            const cancellationSource = IdCancellationReceiverStrategy.is(cancellationStrategy.receiver)
                ? cancellationStrategy.receiver.createCancellationTokenSource(tokenKey)
                : cancellationStrategy.receiver.createCancellationTokenSource(requestMessage);
            if (requestMessage.id !== null && knownCanceledRequests.has(requestMessage.id)) {
                cancellationSource.cancel();
            }
            if (requestMessage.id !== null) {
                requestTokens.set(tokenKey, cancellationSource);
            }
            try {
                let handlerResult;
                if (requestHandler) {
                    if (requestMessage.params === undefined) {
                        if (type !== undefined && type.numberOfParams !== 0) {
                            replyError(new messages_1.ResponseError(messages_1.ErrorCodes.InvalidParams, `Request ${requestMessage.method} defines ${type.numberOfParams} params but received none.`), requestMessage.method, startTime);
                            return;
                        }
                        handlerResult = requestHandler(cancellationSource.token);
                    }
                    else if (Array.isArray(requestMessage.params)) {
                        if (type !== undefined && type.parameterStructures === messages_1.ParameterStructures.byName) {
                            replyError(new messages_1.ResponseError(messages_1.ErrorCodes.InvalidParams, `Request ${requestMessage.method} defines parameters by name but received parameters by position`), requestMessage.method, startTime);
                            return;
                        }
                        handlerResult = requestHandler(...requestMessage.params, cancellationSource.token);
                    }
                    else {
                        if (type !== undefined && type.parameterStructures === messages_1.ParameterStructures.byPosition) {
                            replyError(new messages_1.ResponseError(messages_1.ErrorCodes.InvalidParams, `Request ${requestMessage.method} defines parameters by position but received parameters by name`), requestMessage.method, startTime);
                            return;
                        }
                        handlerResult = requestHandler(requestMessage.params, cancellationSource.token);
                    }
                }
                else if (starRequestHandler) {
                    handlerResult = starRequestHandler(requestMessage.method, requestMessage.params, cancellationSource.token);
                }
                const promise = handlerResult;
                if (!handlerResult) {
                    requestTokens.delete(tokenKey);
                    replySuccess(handlerResult, requestMessage.method, startTime);
                }
                else if (promise.then) {
                    promise.then((resultOrError) => {
                        requestTokens.delete(tokenKey);
                        reply(resultOrError, requestMessage.method, startTime);
                    }, error => {
                        requestTokens.delete(tokenKey);
                        if (error instanceof messages_1.ResponseError) {
                            replyError(error, requestMessage.method, startTime);
                        }
                        else if (error && Is.string(error.message)) {
                            replyError(new messages_1.ResponseError(messages_1.ErrorCodes.InternalError, `Request ${requestMessage.method} failed with message: ${error.message}`), requestMessage.method, startTime);
                        }
                        else {
                            replyError(new messages_1.ResponseError(messages_1.ErrorCodes.InternalError, `Request ${requestMessage.method} failed unexpectedly without providing any details.`), requestMessage.method, startTime);
                        }
                    });
                }
                else {
                    requestTokens.delete(tokenKey);
                    reply(handlerResult, requestMessage.method, startTime);
                }
            }
            catch (error) {
                requestTokens.delete(tokenKey);
                if (error instanceof messages_1.ResponseError) {
                    reply(error, requestMessage.method, startTime);
                }
                else if (error && Is.string(error.message)) {
                    replyError(new messages_1.ResponseError(messages_1.ErrorCodes.InternalError, `Request ${requestMessage.method} failed with message: ${error.message}`), requestMessage.method, startTime);
                }
                else {
                    replyError(new messages_1.ResponseError(messages_1.ErrorCodes.InternalError, `Request ${requestMessage.method} failed unexpectedly without providing any details.`), requestMessage.method, startTime);
                }
            }
        }
        else {
            replyError(new messages_1.ResponseError(messages_1.ErrorCodes.MethodNotFound, `Unhandled method ${requestMessage.method}`), requestMessage.method, startTime);
        }
    }
    function handleResponse(responseMessage) {
        if (isDisposed()) {
            // See handle request.
            return;
        }
        if (responseMessage.id === null) {
            if (responseMessage.error) {
                logger.error(`Received response message without id: Error is: \n${JSON.stringify(responseMessage.error, undefined, 4)}`);
            }
            else {
                logger.error(`Received response message without id. No further error information provided.`);
            }
        }
        else {
            const key = responseMessage.id;
            const responsePromise = responsePromises.get(key);
            traceReceivedResponse(responseMessage, responsePromise);
            if (responsePromise !== undefined) {
                responsePromises.delete(key);
                try {
                    if (responseMessage.error) {
                        const error = responseMessage.error;
                        responsePromise.reject(new messages_1.ResponseError(error.code, error.message, error.data));
                    }
                    else if (responseMessage.result !== undefined) {
                        responsePromise.resolve(responseMessage.result);
                    }
                    else {
                        throw new Error('Should never happen.');
                    }
                }
                catch (error) {
                    if (error.message) {
                        logger.error(`Response handler '${responsePromise.method}' failed with message: ${error.message}`);
                    }
                    else {
                        logger.error(`Response handler '${responsePromise.method}' failed unexpectedly.`);
                    }
                }
            }
        }
    }
    function handleNotification(message) {
        if (isDisposed()) {
            // See handle request.
            return;
        }
        let type = undefined;
        let notificationHandler;
        if (message.method === CancelNotification.type.method) {
            const cancelId = message.params.id;
            knownCanceledRequests.delete(cancelId);
            traceReceivedNotification(message);
            return;
        }
        else {
            const element = notificationHandlers.get(message.method);
            if (element) {
                notificationHandler = element.handler;
                type = element.type;
            }
        }
        if (notificationHandler || starNotificationHandler) {
            try {
                traceReceivedNotification(message);
                if (notificationHandler) {
                    if (message.params === undefined) {
                        if (type !== undefined) {
                            if (type.numberOfParams !== 0 && type.parameterStructures !== messages_1.ParameterStructures.byName) {
                                logger.error(`Notification ${message.method} defines ${type.numberOfParams} params but received none.`);
                            }
                        }
                        notificationHandler();
                    }
                    else if (Array.isArray(message.params)) {
                        // There are JSON-RPC libraries that send progress message as positional params although
                        // specified as named. So convert them if this is the case.
                        const params = message.params;
                        if (message.method === ProgressNotification.type.method && params.length === 2 && ProgressToken.is(params[0])) {
                            notificationHandler({ token: params[0], value: params[1] });
                        }
                        else {
                            if (type !== undefined) {
                                if (type.parameterStructures === messages_1.ParameterStructures.byName) {
                                    logger.error(`Notification ${message.method} defines parameters by name but received parameters by position`);
                                }
                                if (type.numberOfParams !== message.params.length) {
                                    logger.error(`Notification ${message.method} defines ${type.numberOfParams} params but received ${params.length} arguments`);
                                }
                            }
                            notificationHandler(...params);
                        }
                    }
                    else {
                        if (type !== undefined && type.parameterStructures === messages_1.ParameterStructures.byPosition) {
                            logger.error(`Notification ${message.method} defines parameters by position but received parameters by name`);
                        }
                        notificationHandler(message.params);
                    }
                }
                else if (starNotificationHandler) {
                    starNotificationHandler(message.method, message.params);
                }
            }
            catch (error) {
                if (error.message) {
                    logger.error(`Notification handler '${message.method}' failed with message: ${error.message}`);
                }
                else {
                    logger.error(`Notification handler '${message.method}' failed unexpectedly.`);
                }
            }
        }
        else {
            unhandledNotificationEmitter.fire(message);
        }
    }
    function handleInvalidMessage(message) {
        if (!message) {
            logger.error('Received empty message.');
            return;
        }
        logger.error(`Received message which is neither a response nor a notification message:\n${JSON.stringify(message, null, 4)}`);
        // Test whether we find an id to reject the promise
        const responseMessage = message;
        if (Is.string(responseMessage.id) || Is.number(responseMessage.id)) {
            const key = responseMessage.id;
            const responseHandler = responsePromises.get(key);
            if (responseHandler) {
                responseHandler.reject(new Error('The received response has neither a result nor an error property.'));
            }
        }
    }
    function stringifyTrace(params) {
        if (params === undefined || params === null) {
            return undefined;
        }
        switch (trace) {
            case Trace.Verbose:
                return JSON.stringify(params, null, 4);
            case Trace.Compact:
                return JSON.stringify(params);
            default:
                return undefined;
        }
    }
    function traceSendingRequest(message) {
        if (trace === Trace.Off || !tracer) {
            return;
        }
        if (traceFormat === TraceFormat.Text) {
            let data = undefined;
            if ((trace === Trace.Verbose || trace === Trace.Compact) && message.params) {
                data = `Params: ${stringifyTrace(message.params)}\n\n`;
            }
            tracer.log(`Sending request '${message.method} - (${message.id})'.`, data);
        }
        else {
            logLSPMessage('send-request', message);
        }
    }
    function traceSendingNotification(message) {
        if (trace === Trace.Off || !tracer) {
            return;
        }
        if (traceFormat === TraceFormat.Text) {
            let data = undefined;
            if (trace === Trace.Verbose || trace === Trace.Compact) {
                if (message.params) {
                    data = `Params: ${stringifyTrace(message.params)}\n\n`;
                }
                else {
                    data = 'No parameters provided.\n\n';
                }
            }
            tracer.log(`Sending notification '${message.method}'.`, data);
        }
        else {
            logLSPMessage('send-notification', message);
        }
    }
    function traceSendingResponse(message, method, startTime) {
        if (trace === Trace.Off || !tracer) {
            return;
        }
        if (traceFormat === TraceFormat.Text) {
            let data = undefined;
            if (trace === Trace.Verbose || trace === Trace.Compact) {
                if (message.error && message.error.data) {
                    data = `Error data: ${stringifyTrace(message.error.data)}\n\n`;
                }
                else {
                    if (message.result) {
                        data = `Result: ${stringifyTrace(message.result)}\n\n`;
                    }
                    else if (message.error === undefined) {
                        data = 'No result returned.\n\n';
                    }
                }
            }
            tracer.log(`Sending response '${method} - (${message.id})'. Processing request took ${Date.now() - startTime}ms`, data);
        }
        else {
            logLSPMessage('send-response', message);
        }
    }
    function traceReceivedRequest(message) {
        if (trace === Trace.Off || !tracer) {
            return;
        }
        if (traceFormat === TraceFormat.Text) {
            let data = undefined;
            if ((trace === Trace.Verbose || trace === Trace.Compact) && message.params) {
                data = `Params: ${stringifyTrace(message.params)}\n\n`;
            }
            tracer.log(`Received request '${message.method} - (${message.id})'.`, data);
        }
        else {
            logLSPMessage('receive-request', message);
        }
    }
    function traceReceivedNotification(message) {
        if (trace === Trace.Off || !tracer || message.method === LogTraceNotification.type.method) {
            return;
        }
        if (traceFormat === TraceFormat.Text) {
            let data = undefined;
            if (trace === Trace.Verbose || trace === Trace.Compact) {
                if (message.params) {
                    data = `Params: ${stringifyTrace(message.params)}\n\n`;
                }
                else {
                    data = 'No parameters provided.\n\n';
                }
            }
            tracer.log(`Received notification '${message.method}'.`, data);
        }
        else {
            logLSPMessage('receive-notification', message);
        }
    }
    function traceReceivedResponse(message, responsePromise) {
        if (trace === Trace.Off || !tracer) {
            return;
        }
        if (traceFormat === TraceFormat.Text) {
            let data = undefined;
            if (trace === Trace.Verbose || trace === Trace.Compact) {
                if (message.error && message.error.data) {
                    data = `Error data: ${stringifyTrace(message.error.data)}\n\n`;
                }
                else {
                    if (message.result) {
                        data = `Result: ${stringifyTrace(message.result)}\n\n`;
                    }
                    else if (message.error === undefined) {
                        data = 'No result returned.\n\n';
                    }
                }
            }
            if (responsePromise) {
                const error = message.error ? ` Request failed: ${message.error.message} (${message.error.code}).` : '';
                tracer.log(`Received response '${responsePromise.method} - (${message.id})' in ${Date.now() - responsePromise.timerStart}ms.${error}`, data);
            }
            else {
                tracer.log(`Received response ${message.id} without active response promise.`, data);
            }
        }
        else {
            logLSPMessage('receive-response', message);
        }
    }
    function logLSPMessage(type, message) {
        if (!tracer || trace === Trace.Off) {
            return;
        }
        const lspMessage = {
            isLSPMessage: true,
            type,
            message,
            timestamp: Date.now()
        };
        tracer.log(lspMessage);
    }
    function throwIfClosedOrDisposed() {
        if (isClosed()) {
            throw new ConnectionError(ConnectionErrors.Closed, 'Connection is closed.');
        }
        if (isDisposed()) {
            throw new ConnectionError(ConnectionErrors.Disposed, 'Connection is disposed.');
        }
    }
    function throwIfListening() {
        if (isListening()) {
            throw new ConnectionError(ConnectionErrors.AlreadyListening, 'Connection is already listening');
        }
    }
    function throwIfNotListening() {
        if (!isListening()) {
            throw new Error('Call listen() first.');
        }
    }
    function undefinedToNull(param) {
        if (param === undefined) {
            return null;
        }
        else {
            return param;
        }
    }
    function nullToUndefined(param) {
        if (param === null) {
            return undefined;
        }
        else {
            return param;
        }
    }
    function isNamedParam(param) {
        return param !== undefined && param !== null && !Array.isArray(param) && typeof param === 'object';
    }
    function computeSingleParam(parameterStructures, param) {
        switch (parameterStructures) {
            case messages_1.ParameterStructures.auto:
                if (isNamedParam(param)) {
                    return nullToUndefined(param);
                }
                else {
                    return [undefinedToNull(param)];
                }
            case messages_1.ParameterStructures.byName:
                if (!isNamedParam(param)) {
                    throw new Error(`Received parameters by name but param is not an object literal.`);
                }
                return nullToUndefined(param);
            case messages_1.ParameterStructures.byPosition:
                return [undefinedToNull(param)];
            default:
                throw new Error(`Unknown parameter structure ${parameterStructures.toString()}`);
        }
    }
    function computeMessageParams(type, params) {
        let result;
        const numberOfParams = type.numberOfParams;
        switch (numberOfParams) {
            case 0:
                result = undefined;
                break;
            case 1:
                result = computeSingleParam(type.parameterStructures, params[0]);
                break;
            default:
                result = [];
                for (let i = 0; i < params.length && i < numberOfParams; i++) {
                    result.push(undefinedToNull(params[i]));
                }
                if (params.length < numberOfParams) {
                    for (let i = params.length; i < numberOfParams; i++) {
                        result.push(null);
                    }
                }
                break;
        }
        return result;
    }
    const connection = {
        sendNotification: (type, ...args) => {
            throwIfClosedOrDisposed();
            let method;
            let messageParams;
            if (Is.string(type)) {
                method = type;
                const first = args[0];
                let paramStart = 0;
                let parameterStructures = messages_1.ParameterStructures.auto;
                if (messages_1.ParameterStructures.is(first)) {
                    paramStart = 1;
                    parameterStructures = first;
                }
                let paramEnd = args.length;
                const numberOfParams = paramEnd - paramStart;
                switch (numberOfParams) {
                    case 0:
                        messageParams = undefined;
                        break;
                    case 1:
                        messageParams = computeSingleParam(parameterStructures, args[paramStart]);
                        break;
                    default:
                        if (parameterStructures === messages_1.ParameterStructures.byName) {
                            throw new Error(`Received ${numberOfParams} parameters for 'by Name' notification parameter structure.`);
                        }
                        messageParams = args.slice(paramStart, paramEnd).map(value => undefinedToNull(value));
                        break;
                }
            }
            else {
                const params = args;
                method = type.method;
                messageParams = computeMessageParams(type, params);
            }
            const notificationMessage = {
                jsonrpc: version,
                method: method,
                params: messageParams
            };
            traceSendingNotification(notificationMessage);
            return messageWriter.write(notificationMessage).catch((error) => {
                logger.error(`Sending notification failed.`);
                throw error;
            });
        },
        onNotification: (type, handler) => {
            throwIfClosedOrDisposed();
            let method;
            if (Is.func(type)) {
                starNotificationHandler = type;
            }
            else if (handler) {
                if (Is.string(type)) {
                    method = type;
                    notificationHandlers.set(type, { type: undefined, handler });
                }
                else {
                    method = type.method;
                    notificationHandlers.set(type.method, { type, handler });
                }
            }
            return {
                dispose: () => {
                    if (method !== undefined) {
                        notificationHandlers.delete(method);
                    }
                    else {
                        starNotificationHandler = undefined;
                    }
                }
            };
        },
        onProgress: (_type, token, handler) => {
            if (progressHandlers.has(token)) {
                throw new Error(`Progress handler for token ${token} already registered`);
            }
            progressHandlers.set(token, handler);
            return {
                dispose: () => {
                    progressHandlers.delete(token);
                }
            };
        },
        sendProgress: (_type, token, value) => {
            // This should not await but simple return to ensure that we don't have another
            // async scheduling. Otherwise one send could overtake another send.
            return connection.sendNotification(ProgressNotification.type, { token, value });
        },
        onUnhandledProgress: unhandledProgressEmitter.event,
        sendRequest: (type, ...args) => {
            throwIfClosedOrDisposed();
            throwIfNotListening();
            let method;
            let messageParams;
            let token = undefined;
            if (Is.string(type)) {
                method = type;
                const first = args[0];
                const last = args[args.length - 1];
                let paramStart = 0;
                let parameterStructures = messages_1.ParameterStructures.auto;
                if (messages_1.ParameterStructures.is(first)) {
                    paramStart = 1;
                    parameterStructures = first;
                }
                let paramEnd = args.length;
                if (cancellation_1.CancellationToken.is(last)) {
                    paramEnd = paramEnd - 1;
                    token = last;
                }
                const numberOfParams = paramEnd - paramStart;
                switch (numberOfParams) {
                    case 0:
                        messageParams = undefined;
                        break;
                    case 1:
                        messageParams = computeSingleParam(parameterStructures, args[paramStart]);
                        break;
                    default:
                        if (parameterStructures === messages_1.ParameterStructures.byName) {
                            throw new Error(`Received ${numberOfParams} parameters for 'by Name' request parameter structure.`);
                        }
                        messageParams = args.slice(paramStart, paramEnd).map(value => undefinedToNull(value));
                        break;
                }
            }
            else {
                const params = args;
                method = type.method;
                messageParams = computeMessageParams(type, params);
                const numberOfParams = type.numberOfParams;
                token = cancellation_1.CancellationToken.is(params[numberOfParams]) ? params[numberOfParams] : undefined;
            }
            const id = sequenceNumber++;
            let disposable;
            if (token) {
                disposable = token.onCancellationRequested(() => {
                    const p = cancellationStrategy.sender.sendCancellation(connection, id);
                    if (p === undefined) {
                        logger.log(`Received no promise from cancellation strategy when cancelling id ${id}`);
                        return Promise.resolve();
                    }
                    else {
                        return p.catch(() => {
                            logger.log(`Sending cancellation messages for id ${id} failed`);
                        });
                    }
                });
            }
            const requestMessage = {
                jsonrpc: version,
                id: id,
                method: method,
                params: messageParams
            };
            traceSendingRequest(requestMessage);
            if (typeof cancellationStrategy.sender.enableCancellation === 'function') {
                cancellationStrategy.sender.enableCancellation(requestMessage);
            }
            return new Promise(async (resolve, reject) => {
                const resolveWithCleanup = (r) => {
                    resolve(r);
                    cancellationStrategy.sender.cleanup(id);
                    disposable?.dispose();
                };
                const rejectWithCleanup = (r) => {
                    reject(r);
                    cancellationStrategy.sender.cleanup(id);
                    disposable?.dispose();
                };
                const responsePromise = { method: method, timerStart: Date.now(), resolve: resolveWithCleanup, reject: rejectWithCleanup };
                try {
                    await messageWriter.write(requestMessage);
                    responsePromises.set(id, responsePromise);
                }
                catch (error) {
                    logger.error(`Sending request failed.`);
                    // Writing the message failed. So we need to reject the promise.
                    responsePromise.reject(new messages_1.ResponseError(messages_1.ErrorCodes.MessageWriteError, error.message ? error.message : 'Unknown reason'));
                    throw error;
                }
            });
        },
        onRequest: (type, handler) => {
            throwIfClosedOrDisposed();
            let method = null;
            if (StarRequestHandler.is(type)) {
                method = undefined;
                starRequestHandler = type;
            }
            else if (Is.string(type)) {
                method = null;
                if (handler !== undefined) {
                    method = type;
                    requestHandlers.set(type, { handler: handler, type: undefined });
                }
            }
            else {
                if (handler !== undefined) {
                    method = type.method;
                    requestHandlers.set(type.method, { type, handler });
                }
            }
            return {
                dispose: () => {
                    if (method === null) {
                        return;
                    }
                    if (method !== undefined) {
                        requestHandlers.delete(method);
                    }
                    else {
                        starRequestHandler = undefined;
                    }
                }
            };
        },
        hasPendingResponse: () => {
            return responsePromises.size > 0;
        },
        trace: async (_value, _tracer, sendNotificationOrTraceOptions) => {
            let _sendNotification = false;
            let _traceFormat = TraceFormat.Text;
            if (sendNotificationOrTraceOptions !== undefined) {
                if (Is.boolean(sendNotificationOrTraceOptions)) {
                    _sendNotification = sendNotificationOrTraceOptions;
                }
                else {
                    _sendNotification = sendNotificationOrTraceOptions.sendNotification || false;
                    _traceFormat = sendNotificationOrTraceOptions.traceFormat || TraceFormat.Text;
                }
            }
            trace = _value;
            traceFormat = _traceFormat;
            if (trace === Trace.Off) {
                tracer = undefined;
            }
            else {
                tracer = _tracer;
            }
            if (_sendNotification && !isClosed() && !isDisposed()) {
                await connection.sendNotification(SetTraceNotification.type, { value: Trace.toString(_value) });
            }
        },
        onError: errorEmitter.event,
        onClose: closeEmitter.event,
        onUnhandledNotification: unhandledNotificationEmitter.event,
        onDispose: disposeEmitter.event,
        end: () => {
            messageWriter.end();
        },
        dispose: () => {
            if (isDisposed()) {
                return;
            }
            state = ConnectionState.Disposed;
            disposeEmitter.fire(undefined);
            const error = new messages_1.ResponseError(messages_1.ErrorCodes.PendingResponseRejected, 'Pending response rejected since connection got disposed');
            for (const promise of responsePromises.values()) {
                promise.reject(error);
            }
            responsePromises = new Map();
            requestTokens = new Map();
            knownCanceledRequests = new Set();
            messageQueue = new linkedMap_1.LinkedMap();
            // Test for backwards compatibility
            if (Is.func(messageWriter.dispose)) {
                messageWriter.dispose();
            }
            if (Is.func(messageReader.dispose)) {
                messageReader.dispose();
            }
        },
        listen: () => {
            throwIfClosedOrDisposed();
            throwIfListening();
            state = ConnectionState.Listening;
            messageReader.listen(callback);
        },
        inspect: () => {
            // eslint-disable-next-line no-console
            (0, ral_1.default)().console.log('inspect');
        }
    };
    connection.onNotification(LogTraceNotification.type, (params) => {
        if (trace === Trace.Off || !tracer) {
            return;
        }
        const verbose = trace === Trace.Verbose || trace === Trace.Compact;
        tracer.log(params.message, verbose ? params.verbose : undefined);
    });
    connection.onNotification(ProgressNotification.type, (params) => {
        const handler = progressHandlers.get(params.token);
        if (handler) {
            handler(params.value);
        }
        else {
            unhandledProgressEmitter.fire(params);
        }
    });
    return connection;
}
exports.createMessageConnection = createMessageConnection;