addEventListener('rpc-new', ({detail}) => {
    const {uid, kind, target} = detail.value
    if(kind === 'video') {
        const sender = VideoShare.streams[State.username]
        const receiver = VideoShare.resetStream(target)
        signal({kind: 'rpc-setup', value: {uid, sender, receiver}})
    }
})
const Video = {
    view({attrs: {username}}) {
        const styleVideo = {
            objectFit: Settings.get('blackBars') ? 'contain' : 'cover',
            width: '100%',
            height: '100%',
            transform: username === State.username ? 'scaleX(-1)' : 'scaleX(1)',
        }
        return m('.video-container',
            m('.video-info',
                m(`.label-${username}`, username),
            ),
            m('video[playsinline][autoplay]', {
                style: styleVideo,
                oncreate: ({dom}) => {
                    dom.muted = username === State.username
                    dom.srcObject = VideoShare.streams[username]
                },
                onupdate: ({dom}) => {
                    if(dom.srcObject !== VideoShare.streams[username]) {
                        dom.srcObject = VideoShare.streams[username]
                    }
                },
                onremove: () => VideoShare.resetStream(username),
            }),
        )
    },
}
const Toggle = {
    view({attrs: {key, label}}) {
        const onclick = () => {
            VideoShare[key] = !VideoShare[key]
            VideoShare.getStream()
        }
        const checked = VideoShare[key]
        return m('label.styled',
            m('input[type=checkbox]', {onclick, checked}),
            label,
        )
    },
}
const VideoShareConfig = {
    get video() {
        return VideoShare.videoOn
        && State.online.length < 10
        && params.get('v') !== '0'
        && {width: {ideal: 320}, facingMode: 'user', frameRate: 26}
    },
    get audio() {
        return VideoShare.audioOn
        && params.get('a') !== '0'
    },
    view() {
        return [
            m(Toggle, {key: 'videoOn', label: 'video'}),
            m(Toggle, {key: 'audioOn', label: 'audio'}),
        ]
    },
}
const VideoShare = {
    videoOn: true,
    audioOn: true,
    streams: {},
    oncreate(e) {
        VideoShare.getStream()
    },
    resetStream(target) {
        if(VideoShare.streams[target]) {
            VideoShare.streams[target].getTracks().forEach(tr => tr.stop())
        }
        VideoShare.streams[target] = new MediaStream()
        return VideoShare.streams[target]
    },
    async getStream() {
        VideoShare.resetStream(State.username)
        await navigator.mediaDevices.getUserMedia(VideoShareConfig)
            .catch(error => console.error(error))
            .then(stream => {VideoShare.streams[State.username] = stream})
        m.redraw()
        State.others.forEach(target => {
            signal({kind: 'rpc-needed', value: {kind: 'video', target}})
        })
    },
    reLayout({dom}) {
        const COUNT = dom.children.length || 1
        let [fnx, fny] = [
            Math.floor((1 + Math.sqrt(4 * COUNT - 3)) / 2),
            Math.ceil(Math.sqrt(COUNT)),
        ]
        let max = 0
        for([nx, ny] of [[1, COUNT], [fnx, fny], [COUNT, 1]]) {
            let h = dom.clientHeight / ny
            let w = dom.clientWidth / nx
            if(w > h) {
                w = Math.min(w, h * 4/3)
            }
            else {
                h = Math.min(h, w * 3/4)
            }
            if(h * w > max) {
                max = h * w
                fnx = nx
                fny = ny
            }
        }
        dom.style['grid-template-columns'] = Array(fnx).fill('1fr').join(' ')
        dom.style['grid-template-rows'] = Array(fny).fill('1fr').join(' ')
    },
    view() {
        const style = {
            backgroundColor: 'black',
            overflow: 'hidden',
            display: 'grid',
        }
        const oncreate = VideoShare.reLayout
        const onupdate = VideoShare.reLayout
        return m('.videos', {style, oncreate, onupdate},
            State.online.map(username => m(Video, {key: username, username}))
        )
    },
}
addEventListener('load', () => {
    Headers.push([VideoShareConfig])
    Apps.push([VideoShare, {key: 'stream-container'}])
})