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path: root/src/client/views/nodes/RecordingBox/RecordingView.tsx
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import * as React from 'react';
import "./RecordingView.scss";
import { ReactElement, useCallback, useEffect, useRef, useState } from "react";
import { ProgressBar } from "./ProgressBar"
import { MdBackspace } from 'react-icons/md';
import { FaCheckCircle } from 'react-icons/fa';
import { IconContext } from "react-icons";
import { Networking } from '../../../Network';
import { Upload } from '../../../../server/SharedMediaTypes';

import { RecordingApi } from '../../../util/RecordingApi';
import { DashUploadUtils } from '../../../../server/DashUploadUtils';

export interface MediaSegment {
    videoChunks: any[],
    endTime: number,
    startTime: number
}

interface IRecordingViewProps {
    setResult: (info: Upload.AccessPathInfo, trackScreen: boolean) => void
    setDuration: (seconds: number) => void
    id: string
}

const MAXTIME = 100000;

export function RecordingView(props: IRecordingViewProps) {

    const [recording, setRecording] = useState(false);
    const recordingTimerRef = useRef<number>(0);
    const [recordingTimer, setRecordingTimer] = useState(0); // unit is 0.01 second
    const [playing, setPlaying] = useState(false);
    const [progress, setProgress] = useState(0);

    // acts as a "refresh state" to tell progressBar when to undo
    const [doUndo, setDoUndo] = useState(false);
    // whether an undo can occur or not
    const [canUndo, setCanUndo] = useState(false);

    const [videos, setVideos] = useState<MediaSegment[]>([]);
    const [orderVideos, setOrderVideos] = useState<boolean>(false);
    const videoRecorder = useRef<MediaRecorder | null>(null);
    const videoElementRef = useRef<HTMLVideoElement | null>(null);

    const [finished, setFinished] = useState<boolean>(false)
    const [trackScreen, setTrackScreen] = useState<boolean>(true)



    const DEFAULT_MEDIA_CONSTRAINTS = {
        video: {
            width: 1280,
            height: 720,
        },
        audio: {
            echoCancellation: true,
            noiseSuppression: true,
            sampleRate: 44100
        }
    }


    useEffect(() => {
        if (finished) {
            (async () => {
                const inputPaths: string[] = [];
                const videoFiles: File[] = []
                videos.forEach(async (vid, i) => {
                    const videoFile = new File(vid.videoChunks, `segvideo${i}.mkv`, { type: vid.videoChunks[0].type, lastModified: Date.now() });
                    videoFiles.push(videoFile);

                    const { name } = videoFile;
                    inputPaths.push(name)
                })

                // upload the segments to the server and get their server access paths
                const serverPaths: string[] = (await Networking.UploadFilesToServer(videoFiles))
                    .map(res => (res.result instanceof Error) ? '' : res.result.accessPaths.agnostic.server)

                // concat the segments together using post call
                const result: Upload.AccessPathInfo | Error = await Networking.PostToServer('/concatVideos', serverPaths)
                if (!(result instanceof Error)) {
                    props.setResult(result, trackScreen)
                } else {
                    alert("video conversion failed");
                }
            })();
        }
    }, [videos])

    // this will call upon the progress bar to edit videos to be in the correct order
    useEffect(() => {
        if (finished) setOrderVideos(true);
    }, [finished])

    useEffect(() => {
        // check if the browser supports media devices on first load
        if (!navigator.mediaDevices) {
            console.log('This browser does not support getUserMedia.')
        }
        // console.log('This device has the correct media devices.')
    }, [])

    useEffect(() => {
        // get access to the video element on every render
        videoElementRef.current = document.getElementById(`video-${props.id}`) as HTMLVideoElement;
    });

    useEffect(() => {
        let interval: any = null;
        if (recording) {
            interval = setInterval(() => {
                setRecordingTimer(unit => unit + 1);
            }, 10);
        } else if (!recording && recordingTimer !== 0) {
            clearInterval(interval);
        }
        return () => clearInterval(interval);
    }, [recording])

    useEffect(() => {
        setVideoProgressHelper(recordingTimer)
        recordingTimerRef.current = recordingTimer;
    }, [recordingTimer])

    const setVideoProgressHelper = (progress: number) => {
        const newProgress = (progress / MAXTIME) * 100;
        setProgress(newProgress)
    }
    const startShowingStream = async (mediaConstraints = DEFAULT_MEDIA_CONSTRAINTS) => {
        const stream = await navigator.mediaDevices.getUserMedia(mediaConstraints)

        videoElementRef.current!.src = ""
        videoElementRef.current!.srcObject = stream
        videoElementRef.current!.muted = true

        return stream
    }

    const record = async () => {
        const stream = await startShowingStream();
        videoRecorder.current = new MediaRecorder(stream)

        // temporary chunks of video
        let videoChunks: any = []

        videoRecorder.current.ondataavailable = (event: any) => {
            if (event.data.size > 0) {
                videoChunks.push(event.data)
            }
        }

        videoRecorder.current.onstart = (event: any) => {
            setRecording(true);
            trackScreen && RecordingApi.Instance.start();
        }

        videoRecorder.current.onstop = () => {
            // if we have a last portion
            if (videoChunks.length > 1) {
                // append the current portion to the video pieces
                setVideos(videos => [...videos, { videoChunks: videoChunks, endTime: recordingTimerRef.current, startTime: videos?.lastElement()?.endTime || 0 }])
            }

            // reset the temporary chunks
            videoChunks = []
            setRecording(false);
            trackScreen && RecordingApi.Instance.pause();
        }

        // recording paused
        videoRecorder.current.onpause = (event: any) => {
            // append the current portion to the video pieces
            setVideos(videos => [...videos, { videoChunks: videoChunks, endTime: recordingTimerRef.current, startTime: videos?.lastElement()?.endTime || 0 }])

            // reset the temporary chunks
            videoChunks = []
            setRecording(false);
            trackScreen && RecordingApi.Instance.pause();
        }

        videoRecorder.current.onresume = async (event: any) => {
            await startShowingStream();
            setRecording(true);
            trackScreen && RecordingApi.Instance.resume();
        }

        videoRecorder.current.start(200)
    }


    const stop = (e: React.MouseEvent) => {
        e.stopPropagation()
        if (videoRecorder.current) {
            setFinished(true);
            if (videoRecorder.current.state !== "inactive") {
                videoRecorder.current.stop();
                // recorder.current.stream.getTracks().forEach((track: any) => track.stop())
            }
        }
    }

    const pause = (e: React.MouseEvent) => {
        e.stopPropagation()
        if (videoRecorder.current) {
            if (videoRecorder.current.state === "recording") {
                videoRecorder.current.stop();
            }
        }
    }

    const startOrResume = (e: React.MouseEvent) => {
        e.stopPropagation()
        if (!videoRecorder.current || videoRecorder.current.state === "inactive") {
            record();
        } else if (videoRecorder.current.state === "paused") {
            videoRecorder.current.start();
        }
    }

    const undoPrevious = (e: React.MouseEvent) => {
        e.stopPropagation();
        setDoUndo(prev => !prev);
    }

    const handleOnTimeUpdate = () => {
        if (playing) {
            setVideoProgressHelper(videoElementRef.current!.currentTime)
        }
    };

    const millisecondToMinuteSecond = (milliseconds: number) => {
        const toTwoDigit = (digit: number) => {
            return String(digit).length == 1 ? "0" + digit : digit
        }
        const minutes = Math.floor((milliseconds % (1000 * 60 * 60)) / (1000 * 60));
        const seconds = Math.floor((milliseconds % (1000 * 60)) / 1000);
        return toTwoDigit(minutes) + " : " + toTwoDigit(seconds);
    }

    // TODO: have the undo button only appear if there is something to undo
    return (
        <div className="recording-container">
            <div className="video-wrapper">
                <video id={`video-${props.id}`}
                    autoPlay
                    muted
                    onTimeUpdate={handleOnTimeUpdate}
                />
                <div className="recording-sign">
                    <span className="dot" />
                    <p className="timer">{millisecondToMinuteSecond(recordingTimer * 10)}</p>
                </div>
                <div className="controls">

                    <div className="controls-inner-container">
                        <div className="record-button-wrapper">
                            {recording ?
                                <button className="stop-button" onClick={pause} /> :
                                <button className="record-button" onClick={startOrResume} />
                            }
                        </div>

                        {!recording && (videos.length > 0 ?

                            <div className="options-wrapper video-edit-wrapper">
                                <IconContext.Provider value={{ color: "grey", className: "video-edit-buttons", style: {display: canUndo ? 'inherit' : 'none'} }}>
                                    <MdBackspace onClick={undoPrevious} />
                                </IconContext.Provider>
                                <IconContext.Provider value={{ color: "#cc1c08", className: "video-edit-buttons" }}>
                                    <FaCheckCircle onClick={stop} />
                                </IconContext.Provider>
                            </div>

                            : <div className="options-wrapper track-screen-wrapper">
                                <label className="track-screen">
                                    <input type="checkbox" checked={trackScreen} onChange={(e) => { setTrackScreen(e.target.checked) }} />
                                    <span className="checkmark"></span>
                                    Track Screen
                                </label>
                            </div>)}

                    </div>

                </div>

                <ProgressBar
                    videos={videos}
                    setVideos={setVideos}
                    orderVideos={orderVideos}
                    progress={progress}
                    recording={recording}
                    doUndo={doUndo}
                    setCanUndo={setCanUndo}
                // playSegment={playSegment}
                />
            </div>
        </div>)
}