(function(global, factory) {
  typeof exports === "object" && typeof module !== "undefined" ? factory(exports) : typeof define === "function" && define.amd ? define([ "exports" ], factory) : factory(global.ActionCable = {});
})(this, function(exports) {
  "use strict";
  var adapters = {
    logger: self.console,
    WebSocket: self.WebSocket
  };
  var logger = {
    log: function log() {
      if (this.enabled) {
        var _adapters$logger;
        for (var _len = arguments.length, messages = Array(_len), _key = 0; _key < _len; _key++) {
          messages[_key] = arguments[_key];
        }
        messages.push(Date.now());
        (_adapters$logger = adapters.logger).log.apply(_adapters$logger, [ "[ActionCable]" ].concat(messages));
      }
    }
  };
  var _typeof = typeof Symbol === "function" && typeof Symbol.iterator === "symbol" ? function(obj) {
    return typeof obj;
  } : function(obj) {
    return obj && typeof Symbol === "function" && obj.constructor === Symbol && obj !== Symbol.prototype ? "symbol" : typeof obj;
  };
  var classCallCheck = function(instance, Constructor) {
    if (!(instance instanceof Constructor)) {
      throw new TypeError("Cannot call a class as a function");
    }
  };
  var now = function now() {
    return new Date().getTime();
  };
  var secondsSince = function secondsSince(time) {
    return (now() - time) / 1e3;
  };
  var clamp = function clamp(number, min, max) {
    return Math.max(min, Math.min(max, number));
  };
  var ConnectionMonitor = function() {
    function ConnectionMonitor(connection) {
      classCallCheck(this, ConnectionMonitor);
      this.visibilityDidChange = this.visibilityDidChange.bind(this);
      this.connection = connection;
      this.reconnectAttempts = 0;
    }
    ConnectionMonitor.prototype.start = function start() {
      if (!this.isRunning()) {
        this.startedAt = now();
        delete this.stoppedAt;
        this.startPolling();
        addEventListener("visibilitychange", this.visibilityDidChange);
        logger.log("ConnectionMonitor started. pollInterval = " + this.getPollInterval() + " ms");
      }
    };
    ConnectionMonitor.prototype.stop = function stop() {
      if (this.isRunning()) {
        this.stoppedAt = now();
        this.stopPolling();
        removeEventListener("visibilitychange", this.visibilityDidChange);
        logger.log("ConnectionMonitor stopped");
      }
    };
    ConnectionMonitor.prototype.isRunning = function isRunning() {
      return this.startedAt && !this.stoppedAt;
    };
    ConnectionMonitor.prototype.recordPing = function recordPing() {
      this.pingedAt = now();
    };
    ConnectionMonitor.prototype.recordConnect = function recordConnect() {
      this.reconnectAttempts = 0;
      this.recordPing();
      delete this.disconnectedAt;
      logger.log("ConnectionMonitor recorded connect");
    };
    ConnectionMonitor.prototype.recordDisconnect = function recordDisconnect() {
      this.disconnectedAt = now();
      logger.log("ConnectionMonitor recorded disconnect");
    };
    ConnectionMonitor.prototype.startPolling = function startPolling() {
      this.stopPolling();
      this.poll();
    };
    ConnectionMonitor.prototype.stopPolling = function stopPolling() {
      clearTimeout(this.pollTimeout);
    };
    ConnectionMonitor.prototype.poll = function poll() {
      var _this = this;
      this.pollTimeout = setTimeout(function() {
        _this.reconnectIfStale();
        _this.poll();
      }, this.getPollInterval());
    };
    ConnectionMonitor.prototype.getPollInterval = function getPollInterval() {
      var _constructor$pollInte = this.constructor.pollInterval, min = _constructor$pollInte.min, max = _constructor$pollInte.max, multiplier = _constructor$pollInte.multiplier;
      var interval = multiplier * Math.log(this.reconnectAttempts + 1);
      return Math.round(clamp(interval, min, max) * 1e3);
    };
    ConnectionMonitor.prototype.reconnectIfStale = function reconnectIfStale() {
      if (this.connectionIsStale()) {
        logger.log("ConnectionMonitor detected stale connection. reconnectAttempts = " + this.reconnectAttempts + ", pollInterval = " + this.getPollInterval() + " ms, time disconnected = " + secondsSince(this.disconnectedAt) + " s, stale threshold = " + this.constructor.staleThreshold + " s");
        this.reconnectAttempts++;
        if (this.disconnectedRecently()) {
          logger.log("ConnectionMonitor skipping reopening recent disconnect");
        } else {
          logger.log("ConnectionMonitor reopening");
          this.connection.reopen();
        }
      }
    };
    ConnectionMonitor.prototype.connectionIsStale = function connectionIsStale() {
      return secondsSince(this.pingedAt ? this.pingedAt : this.startedAt) > this.constructor.staleThreshold;
    };
    ConnectionMonitor.prototype.disconnectedRecently = function disconnectedRecently() {
      return this.disconnectedAt && secondsSince(this.disconnectedAt) < this.constructor.staleThreshold;
    };
    ConnectionMonitor.prototype.visibilityDidChange = function visibilityDidChange() {
      var _this2 = this;
      if (document.visibilityState === "visible") {
        setTimeout(function() {
          if (_this2.connectionIsStale() || !_this2.connection.isOpen()) {
            logger.log("ConnectionMonitor reopening stale connection on visibilitychange. visbilityState = " + document.visibilityState);
            _this2.connection.reopen();
          }
        }, 200);
      }
    };
    return ConnectionMonitor;
  }();
  ConnectionMonitor.pollInterval = {
    min: 3,
    max: 30,
    multiplier: 5
  };
  ConnectionMonitor.staleThreshold = 6;
  var INTERNAL = {
    message_types: {
      welcome: "welcome",
      disconnect: "disconnect",
      ping: "ping",
      confirmation: "confirm_subscription",
      rejection: "reject_subscription"
    },
    disconnect_reasons: {
      unauthorized: "unauthorized",
      invalid_request: "invalid_request",
      server_restart: "server_restart"
    },
    default_mount_path: "/cable",
    protocols: [ "actioncable-v1-json", "actioncable-unsupported" ]
  };
  var message_types = INTERNAL.message_types, protocols = INTERNAL.protocols;
  var supportedProtocols = protocols.slice(0, protocols.length - 1);
  var indexOf = [].indexOf;
  var Connection = function() {
    function Connection(consumer) {
      classCallCheck(this, Connection);
      this.open = this.open.bind(this);
      this.consumer = consumer;
      this.subscriptions = this.consumer.subscriptions;
      this.monitor = new ConnectionMonitor(this);
      this.disconnected = true;
    }
    Connection.prototype.send = function send(data) {
      if (this.isOpen()) {
        this.webSocket.send(JSON.stringify(data));
        return true;
      } else {
        return false;
      }
    };
    Connection.prototype.open = function open() {
      if (this.isActive()) {
        logger.log("Attempted to open WebSocket, but existing socket is " + this.getState());
        return false;
      } else {
        logger.log("Opening WebSocket, current state is " + this.getState() + ", subprotocols: " + protocols);
        if (this.webSocket) {
          this.uninstallEventHandlers();
        }
        this.webSocket = new adapters.WebSocket(this.consumer.url, protocols);
        this.installEventHandlers();
        this.monitor.start();
        return true;
      }
    };
    Connection.prototype.close = function close() {
      var _ref = arguments.length > 0 && arguments[0] !== undefined ? arguments[0] : {
        allowReconnect: true
      }, allowReconnect = _ref.allowReconnect;
      if (!allowReconnect) {
        this.monitor.stop();
      }
      if (this.isActive()) {
        return this.webSocket.close();
      }
    };
    Connection.prototype.reopen = function reopen() {
      logger.log("Reopening WebSocket, current state is " + this.getState());
      if (this.isActive()) {
        try {
          return this.close();
        } catch (error) {
          logger.log("Failed to reopen WebSocket", error);
        } finally {
          logger.log("Reopening WebSocket in " + this.constructor.reopenDelay + "ms");
          setTimeout(this.open, this.constructor.reopenDelay);
        }
      } else {
        return this.open();
      }
    };
    Connection.prototype.getProtocol = function getProtocol() {
      if (this.webSocket) {
        return this.webSocket.protocol;
      }
    };
    Connection.prototype.isOpen = function isOpen() {
      return this.isState("open");
    };
    Connection.prototype.isActive = function isActive() {
      return this.isState("open", "connecting");
    };
    Connection.prototype.isProtocolSupported = function isProtocolSupported() {
      return indexOf.call(supportedProtocols, this.getProtocol()) >= 0;
    };
    Connection.prototype.isState = function isState() {
      for (var _len = arguments.length, states = Array(_len), _key = 0; _key < _len; _key++) {
        states[_key] = arguments[_key];
      }
      return indexOf.call(states, this.getState()) >= 0;
    };
    Connection.prototype.getState = function getState() {
      if (this.webSocket) {
        for (var state in adapters.WebSocket) {
          if (adapters.WebSocket[state] === this.webSocket.readyState) {
            return state.toLowerCase();
          }
        }
      }
      return null;
    };
    Connection.prototype.installEventHandlers = function installEventHandlers() {
      for (var eventName in this.events) {
        var handler = this.events[eventName].bind(this);
        this.webSocket["on" + eventName] = handler;
      }
    };
    Connection.prototype.uninstallEventHandlers = function uninstallEventHandlers() {
      for (var eventName in this.events) {
        this.webSocket["on" + eventName] = function() {};
      }
    };
    return Connection;
  }();
  Connection.reopenDelay = 500;
  Connection.prototype.events = {
    message: function message(event) {
      if (!this.isProtocolSupported()) {
        return;
      }
      var _JSON$parse = JSON.parse(event.data), identifier = _JSON$parse.identifier, message = _JSON$parse.message, reason = _JSON$parse.reason, reconnect = _JSON$parse.reconnect, type = _JSON$parse.type;
      switch (type) {
       case message_types.welcome:
        this.monitor.recordConnect();
        return this.subscriptions.reload();

       case message_types.disconnect:
        logger.log("Disconnecting. Reason: " + reason);
        return this.close({
          allowReconnect: reconnect
        });

       case message_types.ping:
        return this.monitor.recordPing();

       case message_types.confirmation:
        return this.subscriptions.notify(identifier, "connected");

       case message_types.rejection:
        return this.subscriptions.reject(identifier);

       default:
        return this.subscriptions.notify(identifier, "received", message);
      }
    },
    open: function open() {
      logger.log("WebSocket onopen event, using '" + this.getProtocol() + "' subprotocol");
      this.disconnected = false;
      if (!this.isProtocolSupported()) {
        logger.log("Protocol is unsupported. Stopping monitor and disconnecting.");
        return this.close({
          allowReconnect: false
        });
      }
    },
    close: function close(event) {
      logger.log("WebSocket onclose event");
      if (this.disconnected) {
        return;
      }
      this.disconnected = true;
      this.monitor.recordDisconnect();
      return this.subscriptions.notifyAll("disconnected", {
        willAttemptReconnect: this.monitor.isRunning()
      });
    },
    error: function error() {
      logger.log("WebSocket onerror event");
    }
  };
  var extend = function extend(object, properties) {
    if (properties != null) {
      for (var key in properties) {
        var value = properties[key];
        object[key] = value;
      }
    }
    return object;
  };
  var Subscription = function() {
    function Subscription(consumer) {
      var params = arguments.length > 1 && arguments[1] !== undefined ? arguments[1] : {};
      var mixin = arguments[2];
      classCallCheck(this, Subscription);
      this.consumer = consumer;
      this.identifier = JSON.stringify(params);
      extend(this, mixin);
    }
    Subscription.prototype.perform = function perform(action) {
      var data = arguments.length > 1 && arguments[1] !== undefined ? arguments[1] : {};
      data.action = action;
      return this.send(data);
    };
    Subscription.prototype.send = function send(data) {
      return this.consumer.send({
        command: "message",
        identifier: this.identifier,
        data: JSON.stringify(data)
      });
    };
    Subscription.prototype.unsubscribe = function unsubscribe() {
      return this.consumer.subscriptions.remove(this);
    };
    return Subscription;
  }();
  var Subscriptions = function() {
    function Subscriptions(consumer) {
      classCallCheck(this, Subscriptions);
      this.consumer = consumer;
      this.subscriptions = [];
    }
    Subscriptions.prototype.create = function create(channelName, mixin) {
      var channel = channelName;
      var params = (typeof channel === "undefined" ? "undefined" : _typeof(channel)) === "object" ? channel : {
        channel: channel
      };
      var subscription = new Subscription(this.consumer, params, mixin);
      return this.add(subscription);
    };
    Subscriptions.prototype.add = function add(subscription) {
      this.subscriptions.push(subscription);
      this.consumer.ensureActiveConnection();
      this.notify(subscription, "initialized");
      this.sendCommand(subscription, "subscribe");
      return subscription;
    };
    Subscriptions.prototype.remove = function remove(subscription) {
      this.forget(subscription);
      if (!this.findAll(subscription.identifier).length) {
        this.sendCommand(subscription, "unsubscribe");
      }
      return subscription;
    };
    Subscriptions.prototype.reject = function reject(identifier) {
      var _this = this;
      return this.findAll(identifier).map(function(subscription) {
        _this.forget(subscription);
        _this.notify(subscription, "rejected");
        return subscription;
      });
    };
    Subscriptions.prototype.forget = function forget(subscription) {
      this.subscriptions = this.subscriptions.filter(function(s) {
        return s !== subscription;
      });
      return subscription;
    };
    Subscriptions.prototype.findAll = function findAll(identifier) {
      return this.subscriptions.filter(function(s) {
        return s.identifier === identifier;
      });
    };
    Subscriptions.prototype.reload = function reload() {
      var _this2 = this;
      return this.subscriptions.map(function(subscription) {
        return _this2.sendCommand(subscription, "subscribe");
      });
    };
    Subscriptions.prototype.notifyAll = function notifyAll(callbackName) {
      var _this3 = this;
      for (var _len = arguments.length, args = Array(_len > 1 ? _len - 1 : 0), _key = 1; _key < _len; _key++) {
        args[_key - 1] = arguments[_key];
      }
      return this.subscriptions.map(function(subscription) {
        return _this3.notify.apply(_this3, [ subscription, callbackName ].concat(args));
      });
    };
    Subscriptions.prototype.notify = function notify(subscription, callbackName) {
      for (var _len2 = arguments.length, args = Array(_len2 > 2 ? _len2 - 2 : 0), _key2 = 2; _key2 < _len2; _key2++) {
        args[_key2 - 2] = arguments[_key2];
      }
      var subscriptions = void 0;
      if (typeof subscription === "string") {
        subscriptions = this.findAll(subscription);
      } else {
        subscriptions = [ subscription ];
      }
      return subscriptions.map(function(subscription) {
        return typeof subscription[callbackName] === "function" ? subscription[callbackName].apply(subscription, args) : undefined;
      });
    };
    Subscriptions.prototype.sendCommand = function sendCommand(subscription, command) {
      var identifier = subscription.identifier;
      return this.consumer.send({
        command: command,
        identifier: identifier
      });
    };
    return Subscriptions;
  }();
  var Consumer = function() {
    function Consumer(url) {
      classCallCheck(this, Consumer);
      this.url = url;
      this.subscriptions = new Subscriptions(this);
      this.connection = new Connection(this);
    }
    Consumer.prototype.send = function send(data) {
      return this.connection.send(data);
    };
    Consumer.prototype.connect = function connect() {
      return this.connection.open();
    };
    Consumer.prototype.disconnect = function disconnect() {
      return this.connection.close({
        allowReconnect: false
      });
    };
    Consumer.prototype.ensureActiveConnection = function ensureActiveConnection() {
      if (!this.connection.isActive()) {
        return this.connection.open();
      }
    };
    return Consumer;
  }();
  function createConsumer() {
    var url = arguments.length > 0 && arguments[0] !== undefined ? arguments[0] : getConfig("url") || INTERNAL.default_mount_path;
    return new Consumer(createWebSocketURL(url));
  }
  function getConfig(name) {
    var element = document.head.querySelector("meta[name='action-cable-" + name + "']");
    if (element) {
      return element.getAttribute("content");
    }
  }
  function createWebSocketURL(url) {
    var webSocketURL = typeof url === "function" ? url() : url;
    if (webSocketURL && !/^wss?:/i.test(webSocketURL)) {
      var a = document.createElement("a");
      a.href = webSocketURL;
      a.href = a.href;
      a.protocol = a.protocol.replace("http", "ws");
      return a.href;
    } else {
      return webSocketURL;
    }
  }
  exports.Connection = Connection;
  exports.ConnectionMonitor = ConnectionMonitor;
  exports.Consumer = Consumer;
  exports.INTERNAL = INTERNAL;
  exports.Subscription = Subscription;
  exports.Subscriptions = Subscriptions;
  exports.adapters = adapters;
  exports.logger = logger;
  exports.createConsumer = createConsumer;
  exports.getConfig = getConfig;
  exports.createWebSocketURL = createWebSocketURL;
  Object.defineProperty(exports, "__esModule", {
    value: true
  });
});