export class SrsRTC {
    constructor(url){
       
        this.stream = new MediaStream();
        this.url = url;
        this.offer = null;
        this.pc  =null;
        // this.pc = new RTCPeerConnection(null);
        // this.pc.ontrack =  (event) => {
        //         // https://webrtc.org/getting-started/remote-streams
        //     console.warn('event',event.track)
        //     if(this.stream){
        //         this.stream.addTrack(event.track);
        //     }
        // };

    }
    close(){
        this.pc && this.pc.close();
        this.pc = null;
    }
 
    async getVideo(clipUrl){

        if(!this.pc){
            this.pc = new RTCPeerConnection(null);  
            this.pc.ontrack =  (event) => {
                // https://webrtc.org/getting-started/remote-streams
                console.log('event',event.track)
                if(this.stream){
                    // this.stream.removeTrack(event.track));
                    const videoTrack = this.stream.getVideoTracks().find(i=>i.kind ==='video')
                    console.log('videoTrack',videoTrack)
                    if(videoTrack){
                        this.stream.removeTrack(videoTrack);
                    }
                    // if(this.stream.removeTrack())
                    this.stream.addTrack(event.track);
                }
            };
        }
     
        this.pc.addTransceiver("video", {direction: "recvonly"});

        const serverApi ='https://demo-kms.4dage.com:443/rtc/v1/play/';
        const tid = Number(parseInt(new Date().getTime()*Math.random()*100)).toString(16).slice(0, 7);
        var offer = await this.pc.createOffer();
        this.offer  = offer;
        await this.pc.setLocalDescription(offer);
        const session = await new Promise(function(resolve, reject) {
            // @see https://github.com/rtcdn/rtcdn-draft
            var data = {
                api: serverApi,
                tid: tid,
                streamurl: clipUrl,
                clientip: null, 
                sdp: offer.sdp
            };
            console.log("Generated offer: ", data);
            $.ajax({
                type: "POST", url: serverApi, data: JSON.stringify(data),
                contentType:'application/json', dataType: 'json'
            }).done(function(data) {
                console.log("Got answer: ", data);
                if (data.code) {
                    reject(data); return;
                }

                resolve(data);
            }).fail(function(reason){
                reject(reason);
            });
        });
        await this.pc.setRemoteDescription(
            new RTCSessionDescription({type: 'answer', sdp: session.sdp})
        );
        
    
        return session;
        
    }
}