/*!
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 * (c) 2014-2022 Guillermo Rauch
 * Released under the MIT License.
 */
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addEventListener&&(n.opts.closeOnBeforeunload&&addEventListener("beforeunload",(function(){n.transport&&(n.transport.removeAllListeners(),n.transport.close())}),!1),"localhost"!==n.hostname&&(n.offlineEventListener=function(){n.onClose("transport close",{description:"network connection lost"})},addEventListener("offline",n.offlineEventListener,!1))),n.open(),n}return n(a,[{key:"createTransport",value:function(t){var e=o({},this.opts.query);e.EIO=4,e.transport=t,this.id&&(e.sid=this.id);var r=o({},this.opts.transportOptions[t],this.opts,{query:e,socket:this,hostname:this.hostname,secure:this.secure,port:this.port});return new it[t](r)}},{key:"open",value:function(){var t,e=this;if(this.opts.rememberUpgrade&&a.priorWebsocketSuccess&&-1!==this.transports.indexOf("websocket"))t="websocket";else{if(0===this.transports.length)return void this.setTimeoutFn((function(){e.emitReserved("error","No transports available")}),0);t=this.transports[0]}this.readyState="opening";try{t=this.createTransport(t)}catch(t){return this.transports.shift(),void this.open()}t.open(),this.setTransport(t)}},{key:"setTransport",value:function(t){var e=this;this.transport&&this.transport.removeAllListeners(),this.transport=t,t.on("drain",this.onDrain.bind(this)).on("packet",this.onPacket.bind(this)).on("error",this.onError.bind(this)).on("close",(function(t){return e.onClose("transport close",t)}))}},{key:"probe",value:function(t){var e=this,r=this.createTransport(t),n=!1;a.priorWebsocketSuccess=!1;var o=function(){n||(r.send([{type:"ping",data:"probe"}]),r.once("packet",(function(t){if(!n)if("pong"===t.type&&"probe"===t.data){if(e.upgrading=!0,e.emitReserved("upgrading",r),!r)return;a.priorWebsocketSuccess="websocket"===r.name,e.transport.pause((function(){n||"closed"!==e.readyState&&(h(),e.setTransport(r),r.send([{type:"upgrade"}]),e.emitReserved("upgrade",r),r=null,e.upgrading=!1,e.flush())}))}else{var o=new Error("probe error");o.transport=r.name,e.emitReserved("upgradeError",o)}})))};function i(){n||(n=!0,h(),r.close(),r=null)}var s=function(t){var n=new Error("probe error: "+t);n.transport=r.name,i(),e.emitReserved("upgradeError",n)};function u(){s("transport closed")}function c(){s("socket closed")}function p(t){r&&t.name!==r.name&&i()}var h=function(){r.removeListener("open",o),r.removeListener("error",s),r.removeListener("close",u),e.off("close",c),e.off("upgrading",p)};r.once("open",o),r.once("error",s),r.once("close",u),this.once("close",c),this.once("upgrading",p),r.open()}},{key:"onOpen",value:function(){if(this.readyState="open",a.priorWebsocketSuccess="websocket"===this.transport.name,this.emitReserved("open"),this.flush(),"open"===this.readyState&&this.opts.upgrade&&this.transport.pause)for(var t=0,e=this.upgrades.length;t<e;t++)this.probe(this.upgrades[t])}},{key:"onPacket",value:function(t){if("opening"===this.readyState||"open"===this.readyState||"closing"===this.readyState)switch(this.emitReserved("packet",t),this.emitReserved("heartbeat"),t.type){case"open":this.onHandshake(JSON.parse(t.data));break;case"ping":this.resetPingTimeout(),this.sendPacket("pong"),this.emitReserved("ping"),this.emitReserved("pong");break;case"error":var e=new Error("server error");e.code=t.data,this.onError(e);break;case"message":this.emitReserved("data",t.data),this.emitReserved("message",t.data)}}},{key:"onHandshake",value:function(t){this.emitReserved("handshake",t),this.id=t.sid,this.transport.query.sid=t.sid,this.upgrades=this.filterUpgrades(t.upgrades),this.pingInterval=t.pingInterval,this.pingTimeout=t.pingTimeout,this.maxPayload=t.maxPayload,this.onOpen(),"closed"!==this.readyState&&this.resetPingTimeout()}},{key:"resetPingTimeout",value:function(){var t=this;this.clearTimeoutFn(this.pingTimeoutTimer),this.pingTimeoutTimer=this.setTimeoutFn((function(){t.onClose("ping timeout")}),this.pingInterval+this.pingTimeout),this.opts.autoUnref&&this.pingTimeoutTimer.unref()}},{key:"onDrain",value:function(){this.writeBuffer.splice(0,this.prevBufferLen),this.prevBufferLen=0,0===this.writeBuffer.length?this.emitReserved("drain"):this.flush()}},{key:"flush",value:function(){if("closed"!==this.readyState&&this.transport.writable&&!this.upgrading&&this.writeBuffer.length){var t=this.getWritablePackets();this.transport.send(t),this.prevBufferLen=t.length,this.emitReserved("flush")}}},{key:"getWritablePackets",value:function(){if(!(this.maxPayload&&"polling"===this.transport.name&&this.writeBuffer.length>1))return this.writeBuffer;for(var t,e=1,r=0;r<this.writeBuffer.length;r++){var n=this.writeBuffer[r].data;if(n&&(e+="string"==typeof(t=n)?function(t){for(var e=0,r=0,n=0,o=t.length;n<o;n++)(e=t.charCodeAt(n))<128?r+=1:e<2048?r+=2:e<55296||e>=57344?r+=3:(n++,r+=4);return r}(t):Math.ceil(1.33*(t.byteLength||t.size))),r>0&&e>this.maxPayload)return this.writeBuffer.slice(0,r);e+=2}return this.writeBuffer}},{key:"write",value:function(t,e,r){return this.sendPacket("message",t,e,r),this}},{key:"send",value:function(t,e,r){return this.sendPacket("message",t,e,r),this}},{key:"sendPacket",value:function(t,e,r,n){if("function"==typeof e&&(n=e,e=void 0),"function"==typeof r&&(n=r,r=null),"closing"!==this.readyState&&"closed"!==this.readyState){(r=r||{}).compress=!1!==r.compress;var o={type:t,data:e,options:r};this.emitReserved("packetCreate",o),this.writeBuffer.push(o),n&&this.once("flush",n),this.flush()}}},{key:"close",value:function(){var t=this,e=function(){t.onClose("forced close"),t.transport.close()},r=function r(){t.off("upgrade",r),t.off("upgradeError",r),e()},n=function(){t.once("upgrade",r),t.once("upgradeError",r)};return"opening"!==this.readyState&&"open"!==this.readyState||(this.readyState="closing",this.writeBuffer.length?this.once("drain",(function(){t.upgrading?n():e()})):this.upgrading?n():e()),this}},{key:"onError",value:function(t){a.priorWebsocketSuccess=!1,this.emitReserved("error",t),this.onClose("transport error",t)}},{key:"onClose",value:function(t,e){"opening"!==this.readyState&&"open"!==this.readyState&&"closing"!==this.readyState||(this.clearTimeoutFn(this.pingTimeoutTimer),this.transport.removeAllListeners("close"),this.transport.close(),this.transport.removeAllListeners(),"function"==typeof removeEventListener&&removeEventListener("offline",this.offlineEventListener,!1),this.readyState="closed",this.id=null,this.emitReserved("close",t,e),this.writeBuffer=[],this.prevBufferLen=0)}},{key:"filterUpgrades",value:function(t){for(var e=[],r=0,n=t.length;r<n;r++)~this.transports.indexOf(t[r])&&e.push(t[r]);return e}}]),a}(C);ct.protocol=4;return function(t,e){return new ct(t,e)}}));
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