const VideoConfig = Object.seal({
    videoOn: true,
    audioOn: true,
    get video() {
        return VideoConfig.videoOn && {width: {ideal: 320}, facingMode: 'user', frameRate: 26}
    },
    get audio() {
        return VideoConfig.audioOn
    },
    toggle: (property) => () => {
        VideoConfig[property] = !VideoConfig[property]
        VideoSelf.update()
    }
})
const VideoSelf = {
    update() {
        const stream = document.querySelector('video.self').srcObject
        stream.getTracks().forEach(track => {
            track.stop()
            stream.removeTrack(track)
            delete track
        })
        if(VideoConfig.videoOn || VideoConfig.audioOn) {
            navigator.mediaDevices
            .getUserMedia(VideoConfig)
            .then(s => s.getTracks().forEach(t => stream.addTrack(t)))
            .catch(e => console.error(e))
        }
    },
    setUp: ({dom}) => {
        dom.playsinline = true
        dom.autoplay = true
        dom.muted = true
        dom.srcObject = new MediaStream()
        VideoSelf.update()
    },
    view({attrs: {username}}) {
        const styleOuter = {
            position: 'relative',
            display: 'block',
            backgroundColor: 'black',
            color: 'white',
            overflow: 'hidden',
        }
        const styleInner = {
            objectFit: 'cover',
            width: '100%',
            height: '100%',
            transform: 'scaleX(-1)',
        }
        return m('.video-container', {style: styleOuter},
            m('.video-info', {style: {position: 'absolute', zIndex: 999}},
                m('span', {style: {padding: '5px'}}, username),
            ),
            m('video.self', {style: styleInner, oncreate: this.setUp}),
        )
    },
}
const VideoOther = {
    setUp: ({dom}) => {
        dom.playsinline = true
        dom.autoplay = true
        dom.srcObject = new MediaStream()
    },
    view({attrs: {username}}) {
        const styleOuter = {
            position: 'relative',
            display: 'block',
            backgroundColor: 'black',
            color: 'white',
            overflow: 'hidden',
        }
        const styleInner = {
            objectFit: 'cover',
            width: '100%',
            height: '100%',
            transform: 'scaleX(-1)',
        }
        return m('.video-container', {style: styleOuter},
            m('.video-info', {style: {position: 'absolute', zIndex: 999}},
                m('span', {style: {padding: '5px'}}, username),
            ),
            m('video.self', {style: styleInner, oncreate: this.setUp}),
        )
    },
}
const StreamContainer = {
    getColumns() {
        const n = State.online.length
        if(n > 4) return '1fr 1fr 1fr'
        if(n > 1) return '1fr 1fr'
        return '1fr'
    },
    getRows() {
        const n = State.online.length
        if(n > 6) return '1fr 1fr 1fr'
        if(n > 2) return '1fr 1fr'
        return '1fr'
    },
    view() {
        const style = {
            display: 'grid',
            padding: '3px',
            gridGap: '3px',
            height: '80vh',
            gridTemplateColumns: StreamContainer.getColumns(),
            gridTemplateRows: StreamContainer.getRows(),
        }
        return m('div',
            m('.video-controls',
                m('button', {onclick: VideoConfig.toggle('videoOn')}, 'video'),
                m('button', {onclick: VideoConfig.toggle('audioOn')}, 'audio'),
            ),
            m('.videos', {style},
                m(VideoSelf, {username: State.username}),
                State.online.filter(username => username != State.username)
                    .map(username => m(VideoOther, {username}))
            ),
        )
    },
}