// Type definitions for engine.io-client 3.1
// Project: https://github.com/socketio/engine.io-client
// Definitions by: KentarouTakeda <https://github.com/KentarouTakeda>
// Definitions: https://github.com/DefinitelyTyped/DefinitelyTyped
// TypeScript Version: 2.1

/// <reference types="node" />

import http = require('http');

declare namespace client {
	type Transport = 'polling'|'websocket';
	type Message = string|ArrayBuffer|ArrayBufferView|Blob;
	interface MessageOptions {
		compress?: boolean;
	}
	interface SocketOptions {
		/**
		 * http.Agent to use, defaults to false (NodeJS only)
		 */
		agent?: http.Agent|false;
		/**
		 * defaults to true, whether the client should try to upgrade the transport from long-polling to something better.
		 */
		upgrade?: boolean;
		/**
		 * forces JSONP for polling transport.
		 */
		forceJSONP?: boolean;
		/**
		 * determines whether to use JSONP when necessary for polling.
		 * If disabled (by settings to false) an error will be emitted (saying "No transports available")
		 * if no other transports are available. If another transport is available
		 * for opening a connection (e.g. WebSocket) that transport will be used instead.
		 */
		jsonp?: boolean;
		/**
		 * forces base 64 encoding for polling transport even when XHR2 responseType is available and WebSocket even if the used standard supports binary.
		 */
		forceBase64?: boolean;
		/**
		 * enables XDomainRequest for IE8 to avoid loading bar flashing with click sound. default to false because XDomainRequest has a flaw of not sending cookie.
		 */
		enablesXDR?: boolean;
		/**
		 * whether to add the timestamp with each transport request. Note: polling requests are always stamped unless this option is explicitly set to false (false)
		 */
		timestampRequests?: boolean;
		/**
		 * timestamp parameter (t)
		 */
		timestampParam?: string;
		/**
		 * port the policy server listens on (843)
		 */
		policyPort?: number;
		/**
		 * path to connect to, default is /engine.io
		 */
		path?: string;
		/**
		 * a list of transports to try (in order). Defaults to ['polling', 'websocket']. Engine always attempts to connect directly with the first one, provided the feature detection test for it passes.
		 */
		transports?: Transport[];
		/**
		 * hash of options, indexed by transport name, overriding the common options for the given transport
		 */
		transportOptions?: {[key: string]: SocketOptions};
		/**
		 * defaults to false. If true and if the previous websocket connection to the server succeeded,
		 * the connection attempt will bypass the normal upgrade process and will initially try websocket.
		 * A connection attempt following a transport error will use the normal upgrade process.
		 * It is recommended you turn this on only when using SSL/TLS connections,
		 * or if you know that your network does not block websockets.
		 */
		rememberUpgrade?: boolean;
		/**
		 * Certificate, Private key and CA certificates to use for SSL. Can be used in Node.js client environment to manually specify certificate information.
		 */
		pfx?: string;
		/**
		 * Private key to use for SSL. Can be used in Node.js client environment to manually specify certificate information.
		 */
		key?: string;
		/**
		 * A string of passphrase for the private key or pfx. Can be used in Node.js client environment to manually specify certificate information.
		 */
		passphrase?: string;
		/**
		 * Public x509 certificate to use. Can be used in Node.js client environment to manually specify certificate information.
		 */
		cert?: string;
		/**
		 * An authority certificate or array of authority certificates to check the remote host against.
		 * Can be used in Node.js client environment to manually specify certificate information.
		 */
		ca?: string|string[];
		/**
		 * A string describing the ciphers to use or exclude. Consult the cipher format list for details on the format.
		 * Can be used in Node.js client environment to manually specify certificate information.
		 */
		ciphers?: string;
		/**
		 * If true, the server certificate is verified against the list of supplied CAs.
		 * An 'error' event is emitted if verification fails. Verification happens at the connection level,
		 * before the HTTP request is sent. Can be used in Node.js client environment to manually specify certificate information.
		 */
		rejectUnauthorized?: boolean;
		/**
		 * parameters of the WebSocket permessage-deflate extension (see ws module api docs). Set to false to disable. (true)
		 */
		perMessageDeflate?: any;
		/**
		 * Headers that will be passed for each request to the server (via xhr-polling and via websockets).
		 * These values then can be used during handshake or for special proxies. Can only be used in Node.js client environment.
		 */
		extraHeaders?: {[header: string]: string};
		/**
		 * whether transport upgrades should be restricted to transports supporting binary data (false)
		 */
		onlyBinaryUpgrades?: boolean;
		/**
		 * Uses NodeJS implementation for websockets - even if there is a native Browser-Websocket available,
		 * which is preferred by default over the NodeJS implementation. (This is useful when using hybrid platforms
		 * like nw.js or electron) (false, NodeJS only)
		 */
		forceNode?: boolean;
		/**
		 * the local IP address to connect to
		 */
		localAddress?: string;
	}

	interface UpgradeError extends Error {
		transport: string;
	}

	class Socket {
		protocol?: number;
		binaryType?: 'arraybuffer'|'blob';

		/*
		 * open: Fired upon successful connection.
		 * flush: Fired upon completing a buffer flush
		 * drain: Fired after drain event of transport if writeBuffer is empty
		 * ping: Fired upon flushing a ping packet (ie: actual packet write out)
		 * pong: Fired upon receiving a pong packet.
		 */
		on(ev: 'open'|'flush'|'drain'|'ping'|'pong' , cb: () => void): this;
		/*
		 * Fired when data is received from the server.
		 */
		on(ev: 'message' , cb: (data: string|ArrayBuffer) => void): this;
		/*
		 * Fired upon disconnection. In compliance with the WebSocket API spec, this event may be fired even if the open event does not occur (i.e. due to connection error or close()).
		 */
		on(ev: 'close' , cb: (mes: string, detail?: Error) => void): this;
		/*
		 * Fired when an error occurs.
		 */
		on(ev: 'error' , cb: (err: Error) => void): this;
		/*
		 * Fired if an error occurs with a transport we're trying to upgrade to.
		 */
		on(ev: 'upgradeError' , cb: (err: UpgradeError) => void): this;
		/*
		 * Fired upon upgrade success, after the new transport is set
		 */
		on(ev: 'upgrade' , cb: (transport: any) => void): this;

		/**
		 * Sends a message to the server
		 */
		send(message: Message, opts?: MessageOptions, cb?: () => void): this;

		/**
		 * Disconnects the client.
		 */
		close(): this;
	}
}

declare function client(url?: string, opts?: client.SocketOptions): client.Socket;

export = client;