/*
 * options: name: XXX data: true (Maybe this is based on webrtc) audio: true,
 * video: true, url: "file:///..." > Player screen: true > Desktop (implicit
 * video:true, audio:false) audio: true, video: true > Webcam
 *
 * stream.hasAudio(); stream.hasVideo(); stream.hasData();
 */
import { Participant } from './Participant';
import { Session } from './Session';
import { OpenVidu, Callback } from './OpenVidu';
import EventEmitter = require('wolfy87-eventemitter');
import * as kurentoUtils from 'kurento-utils';

import 'webrtc-adapter';
declare var navigator: any;
declare var RTCSessionDescription: any;

function jq(id: string):string {
    return id.replace(/(@|:|\.|\[|\]|,)/g, "\\$1");
}

function show(id: string){
    document.getElementById(jq(id))!.style.display = 'block';
}

function hide(id: string){
    document.getElementById(jq(id))!.style.display = 'none';
}

export interface StreamOptions {
    id: string;
    participant: Participant;
    recvVideo: any;
    recvAudio: any;
    video: boolean;
    audio: boolean;
    data: boolean;
    mediaConstraints: any;
}

export interface VideoOptions {
    thumb: string;
    video: HTMLVideoElement;
}

export class Stream {

    private ee = new EventEmitter();
    private wrStream: any;
    private wp: any;
    private id: string;
    private video: HTMLVideoElement;
    private videoElements: VideoOptions[] = [];
    private elements: HTMLDivElement[] = [];
    private participant: Participant;
    private speechEvent: any;
    private recvVideo: any;
    private recvAudio: any;
    private sendVideo: boolean;
    private sendAudio: boolean;
    private mediaConstraints: any;
    private showMyRemote = false;
    private localMirrored = false;
    private chanId = 0;
    private dataChannel: boolean;
    private dataChannelOpened = false;

    constructor( private openVidu: OpenVidu, private local: boolean, private room: Session, options: StreamOptions ) {

        if ( options.id ) {
            this.id = options.id;
        } else {
            this.id = "webcam";
        }

        this.participant = options.participant;
        this.recvVideo = options.recvVideo;
        this.recvAudio = options.recvAudio;
        this.dataChannel = options.data || false;
        this.sendVideo = options.video;
        this.sendAudio = options.audio;
        this.mediaConstraints = options.mediaConstraints;
    }

    getRecvVideo() {
        return this.recvVideo;
    }

    getRecvAudio() {
        return this.recvAudio;
    }


    subscribeToMyRemote() {
        this.showMyRemote = true;
    }

    displayMyRemote() {
        return this.showMyRemote;
    }

    mirrorLocalStream( wr ) {
        this.showMyRemote = true;
        this.localMirrored = true;
        if ( wr ) {
            this.wrStream = wr;
        }
    }

    isLocalMirrored() {
        return this.localMirrored;
    }

    getChannelName() {
        return this.getId() + '_' + this.chanId++;
    }


    isDataChannelEnabled() {
        return this.dataChannel;
    }


    isDataChannelOpened() {
        return this.dataChannelOpened;
    }

    onDataChannelOpen( event ) {
        console.log( 'Data channel is opened' );
        this.dataChannelOpened = true;
    }

    onDataChannelClosed( event ) {
        console.log( 'Data channel is closed' );
        this.dataChannelOpened = false;
    }

    sendData( data ) {
        if ( this.wp === undefined ) {
            throw new Error( 'WebRTC peer has not been created yet' );
        }
        if ( !this.dataChannelOpened ) {
            throw new Error( 'Data channel is not opened' );
        }
        console.log( "Sending through data channel: " + data );
        this.wp.send( data );
    }

    getWrStream() {
        return this.wrStream;
    }

    getWebRtcPeer() {
        return this.wp;
    }

    addEventListener( eventName: string, listener: any ) {
        this.ee.addListener( eventName, listener );
    }

    showSpinner( spinnerParentId: string ) {
        let progress = document.createElement( 'div' );
        progress.id = 'progress-' + this.getId();
        progress.style.background = "center transparent url('img/spinner.gif') no-repeat";
        let spinnerParent = document.getElementById( spinnerParentId );
        if(spinnerParent){
            spinnerParent.appendChild( progress );
        }
    }

    hideSpinner( spinnerId?: string ) {
        spinnerId = ( spinnerId === undefined ) ? this.getId() : spinnerId;
        hide( 'progress-' + spinnerId );
    }

    playOnlyVideo( parentElement, thumbnailId ) {
        this.video = document.createElement( 'video' );

        this.video.id = 'native-video-' + this.getId();
        this.video.autoplay = true;
        this.video.controls = false;
        if ( this.wrStream ) {
            this.video.src = URL.createObjectURL( this.wrStream );
            show( thumbnailId );
            this.hideSpinner();
        } else {
            console.log( "No wrStream yet for", this.getId() );
        }

        this.videoElements.push( {
            thumb: thumbnailId,
            video: this.video
        });

        if ( this.local ) {
            this.video.muted = true;
        }

        if ( typeof parentElement === "string" ) {
            let parentElementDom = document.getElementById( parentElement );
            if(parentElementDom){
                parentElementDom.appendChild( this.video );
            }
        } else {
            parentElement.appendChild( this.video );
        }

        return this.video;
    }

    playThumbnail( thumbnailId ) {

        let container = document.createElement( 'div' );
        container.className = "participant";
        container.id = this.getId();
        let thumbnail = document.getElementById( thumbnailId );
        if(thumbnail){
            thumbnail.appendChild( container );
        }

        this.elements.push( container );

        let name = document.createElement( 'div' );
        container.appendChild( name );
        let userName = this.getId().replace( '_webcam', '' );
        if ( userName.length >= 16 ) {
            userName = userName.substring( 0, 16 ) + "...";
        }
        name.appendChild( document.createTextNode( userName ) );
        name.id = "name-" + this.getId();
        name.className = "name";
        name.title = this.getId();

        this.showSpinner( thumbnailId );

        return this.playOnlyVideo( container, thumbnailId );
    }

    getIdInParticipant() {
        return this.id;
    }

    getParticipant() {
        return this.participant;
    }

    getId() {
        if ( this.participant ) {
            return this.participant.getId() + "_" + this.id;
        } else {
            return this.id + "_webcam";
        }
    }

    requestCameraAccess(callback: Callback<Stream>) {

        this.participant.addStream( this );

        let constraints = {
            audio: true,
            video: {
                width: {
                    ideal: 1280
                },
                frameRate: {
                    ideal: 15
                }
            }
        };

         navigator.mediaDevices.getUserMedia(constraints)
        .then(userStream => {
            userStream.getAudioTracks()[0].enabled = this.sendAudio;
            userStream.getVideoTracks()[0].enabled = this.sendVideo;

            this.wrStream = userStream;
            callback(undefined, this);})
        .catch(function(e) {
            console.error( "Access denied", e );
            callback(e, undefined);
        });
    }

    publishVideoCallback( error, sdpOfferParam, wp ) {
        
        if ( error ) {
            return console.error( "(publish) SDP offer error: "
                + JSON.stringify( error ) );
        }

        console.log( "Sending SDP offer to publish as "
            + this.getId(), sdpOfferParam );

        this.openVidu.sendRequest( "publishVideo", {
            sdpOffer: sdpOfferParam,
            doLoopback: this.displayMyRemote() || false
        }, ( error, response ) => {
            if ( error ) {
                console.error( "Error on publishVideo: " + JSON.stringify( error ) );
            } else {
                this.room.emitEvent( 'stream-published', [{
                    stream: this
                }] )
                this.processSdpAnswer( response.sdpAnswer );
            }
        });
    }

    startVideoCallback( error, sdpOfferParam, wp ) {
        if ( error ) {
            return console.error( "(subscribe) SDP offer error: "
                + JSON.stringify( error ) );
        }
        console.log( "Sending SDP offer to subscribe to "
            + this.getId(), sdpOfferParam );
        this.openVidu.sendRequest( "receiveVideoFrom", {
            sender: this.getId(),
            sdpOffer: sdpOfferParam
        }, ( error, response ) => {
            if ( error ) {
                console.error( "Error on recvVideoFrom: " + JSON.stringify( error ) );
            } else {
                this.processSdpAnswer( response.sdpAnswer );
            }
        });
    }

    private initWebRtcPeer( sdpOfferCallback ) {
        if ( this.local ) {

            let userMediaConstraints = {
                audio : this.sendAudio,
                video : this.sendVideo
            }
            
            let options: any = {
                videoStream: this.wrStream,
                mediaConstraints: userMediaConstraints,
                onicecandidate: this.participant.sendIceCandidate.bind( this.participant ),
            }
            
            if ( this.dataChannel ) {
                options.dataChannelConfig = {
                    id: this.getChannelName(),
                    onopen: this.onDataChannelOpen,
                    onclose: this.onDataChannelClosed
                };
                options.dataChannels = true;
            }
            
            if ( this.displayMyRemote() ) {
                this.wp = new kurentoUtils.WebRtcPeer.WebRtcPeerSendrecv( options, error => {
                    if ( error ) {
                        return console.error( error );
                    }
                    this.wp.generateOffer( sdpOfferCallback.bind( this ) );
                });
            } else {
                this.wp = new kurentoUtils.WebRtcPeer.WebRtcPeerSendonly( options, error => {
                    if ( error ) {
                        return console.error( error );
                    }
                    this.wp.generateOffer( sdpOfferCallback.bind( this ) );
                });
            }
        } else {
            let offerConstraints = {
                mandatory: {
                    OfferToReceiveVideo: this.recvVideo,
                    OfferToReceiveAudio: this.recvAudio
                }
            };
            console.log( "Constraints of generate SDP offer (subscribing)",
                offerConstraints );
            let options = {
                onicecandidate: this.participant.sendIceCandidate.bind( this.participant ),
                connectionConstraints: offerConstraints
            }
            this.wp = new kurentoUtils.WebRtcPeer.WebRtcPeerRecvonly( options, error => {
                if ( error ) {
                    return console.error( error );
                }
                this.wp.generateOffer( sdpOfferCallback.bind( this ) );
            });
        }
        console.log( "Waiting for SDP offer to be generated ("
            + ( this.local ? "local" : "remote" ) + " peer: " + this.getId() + ")" );
    }

    publish() {

        // FIXME: Throw error when stream is not local

        this.initWebRtcPeer( this.publishVideoCallback );

        // FIXME: Now we have coupled connecting to a room and adding a
        // stream to this room. But in the new API, there are two steps.
        // This is the second step. For now, it do nothing.

    }

    subscribe() {

        // FIXME: In the current implementation all participants are subscribed
        // automatically to all other participants. We use this method only to
        // negotiate SDP

        this.initWebRtcPeer( this.startVideoCallback );
    }

    processSdpAnswer( sdpAnswer ) {

        let answer = new RTCSessionDescription( {
            type: 'answer',
            sdp: sdpAnswer,
        });
        console.log( this.getId() + ": set peer connection with recvd SDP answer",
            sdpAnswer );
        let participantId = this.getId();
        let pc = this.wp.peerConnection;
        pc.setRemoteDescription( answer, () => {
            // Avoids to subscribe to your own stream remotely 
            // except when showMyRemote is true
            if ( !this.local || this.displayMyRemote() ) {
                this.wrStream = pc.getRemoteStreams()[0];
                console.log( "Peer remote stream", this.wrStream );
                
                if ( this.wrStream != undefined ) {
                    
                    this.speechEvent = kurentoUtils.WebRtcPeer.hark( this.wrStream, { threshold: this.room.thresholdSpeaker });
                    
                    this.speechEvent.on( 'speaking', () => {
                        this.room.addParticipantSpeaking( participantId );
                        this.room.emitEvent( 'stream-speaking', [{
                            participantId: participantId
                        }] );
                    });

                    this.speechEvent.on( 'stopped_speaking', () => {
                        this.room.removeParticipantSpeaking( participantId );
                        this.room.emitEvent( 'stream-stopped-speaking', [{
                            participantId: participantId
                        }] );
                    });
                }
                for (let videoElement of this.videoElements) {
                    let thumbnailId = videoElement.thumb;
                    let video = videoElement.video;
                    video.src = URL.createObjectURL( this.wrStream );
                    video.onplay = () => {
                        console.log( this.getId() + ': ' + 'Video playing' );
                        show(thumbnailId);
                        this.hideSpinner( this.getId() );
                    };
                }
                this.room.emitEvent( 'stream-subscribed', [{
                    stream: this
                }] );
            }
        }, error => {
            console.error( this.getId() + ": Error setting SDP to the peer connection: "
                + JSON.stringify( error ) );
        });
    }

    unpublish() {
        if ( this.wp ) {
            this.wp.dispose();
        } else {
            if ( this.wrStream ) {
                this.wrStream.getAudioTracks().forEach( function( track ) {
                    track.stop && track.stop()
                })
                this.wrStream.getVideoTracks().forEach( function( track ) {
                    track.stop && track.stop()
                })
            }
        }

        if ( this.speechEvent ) {
            this.speechEvent.stop();
        }

        console.log( this.getId() + ": Stream '" + this.id + "' unpublished" );
    }

    dispose() {

        function disposeElement( element ) {
            if ( element && element.parentNode ) {
                element.parentNode.removeChild( element );
            }
        }

        this.elements.forEach( e => disposeElement( e ) );

        this.videoElements.forEach( ve => disposeElement( ve ) );

        disposeElement( "progress-" + this.getId() );

        if ( this.wp ) {
            this.wp.dispose();
        } else {
            if ( this.wrStream ) {
                this.wrStream.getAudioTracks().forEach( function( track ) {
                    track.stop && track.stop()
                })
                this.wrStream.getVideoTracks().forEach( function( track ) {
                    track.stop && track.stop()
                })
            }
        }

        if ( this.speechEvent ) {
            this.speechEvent.stop();
        }

        console.log( this.getId() + ": Stream '" + this.id + "' disposed" );
    }
}