git ssb

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var nest = require('depnest')
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var { h, send, when, computed, map } = require('mutant')
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var extend = require('xtend')
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var pull = require('pull-stream')
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exports.needs = nest({
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  sbot: {
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    pull: {
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      log: 'first',
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      feed: 'first',
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      userFeed: 'first'
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    },
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    obs: {
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      connectedPeers: 'first',
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      localPeers: 'first'
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    }
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  },
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  'about.html.image': 'first',
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  'about.obs.name': 'first',
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  'invite.sheet': 'first',
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  'message.html.compose': 'first',
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  'message.async.publish': 'first',
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  'progress.html.peer': 'first',
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  'feed.html.rollup': 'first',
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  'profile.obs.recentlyUpdated': 'first',
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  'contact.obs.following': 'first',
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  'channel.obs': {
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    subscribed: 'first',
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    recent: 'first'
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  },
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  'keys.sync.id': 'first'
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})
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exports.gives = nest({
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  'page.html.render': true
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})
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exports.create = function (api) {
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  return nest('page.html.render', page)
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  function page (path) {
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    if (path !== '/public') return // "/" is a sigil for "page"
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    var id = api.keys.sync.id()
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    var following = api.contact.obs.following(id)
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    var subscribedChannels = api.channel.obs.subscribed(id)
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    var loading = computed(subscribedChannels.sync, x => !x)
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    var channels = computed(api.channel.obs.recent(), items => items.slice(0, 8), {comparer: arrayEq})
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    var connectedPeers = api.sbot.obs.connectedPeers()
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    var localPeers = api.sbot.obs.localPeers()
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    var connectedPubs = computed([connectedPeers, localPeers], (c, l) => c.filter(x => !l.includes(x)))
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    var oldest = Date.now() - (2 * 24 * 60 * 60e3)
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    getFirstMessage(id, (_, msg) => {
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      if (msg) {
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        // fall back to timestamp stream before this, give 48 hrs for feeds to stabilize
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        if (msg.value.timestamp > oldest) {
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          oldest = Date.now()
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        }
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      }
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    })
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    var prepend = [
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      api.message.html.compose({ meta: { type: 'post' }, placeholder: 'Write a public message' })
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    ]
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    var feedView = api.feed.html.rollup(getFeed, {
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      prepend,
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      waitUntil: computed([
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        following.sync,
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        subscribedChannels.sync
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      ], (...x) => x.every(Boolean)),
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      windowSize: 500,
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      filter: (item) => {
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        return !item.boxed && (
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          id === item.author ||
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          following().has(item.author) ||
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          subscribedChannels().has(item.channel) ||
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          (item.repliesFrom && item.repliesFrom.has(id)) ||
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          item.likes && item.likes.has(id)
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        )
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      },
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      bumpFilter: (msg, group) => {
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        if (!group.message) {
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          return (
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            isMentioned(id, msg.value.content.mentions) ||
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            msg.value.author === id || (
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              fromDay(msg, group.fromTime) && (
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                following().has(msg.value.author) ||
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                group.repliesFrom.has(id)
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              )
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            )
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          )
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        }
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        return true
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      }
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    })
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    var result = h('div.SplitView', [
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      h('div.side', [
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        getSidebar()
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      ]),
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      h('div.main', feedView)
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    ])
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    result.pendingUpdates = feedView.pendingUpdates
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    result.reload = feedView.reload
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    return result
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    function getSidebar () {
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      var whoToFollow = computed([following, api.profile.obs.recentlyUpdated(200), localPeers], (following, recent, peers) => {
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        return Array.from(recent).filter(x => x !== id && !following.has(x) && !peers.includes(x)).slice(0, 10)
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      })
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      return [
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        h('button -pub -full', {
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          'ev-click': api.invite.sheet
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        }, '+ Join Pub'),
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        when(computed(channels, x => x.length), h('h2', 'Active Channels')),
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        when(loading, [ h('Loading') ]),
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        h('div', {
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          classList: 'ChannelList',
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          hidden: loading
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        }, [
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          map(channels, (channel) => {
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            var subscribed = subscribedChannels.has(channel)
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            return h('a.channel', {
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              href: `#${channel}`,
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              classList: [
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                when(subscribed, '-subscribed')
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              ]
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            }, [
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              h('span.name', '#' + channel),
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              when(subscribed,
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                h('a.-unsubscribe', {
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                  'ev-click': send(unsubscribe, channel)
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                }, 'Unsubscribe'),
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                h('a.-subscribe', {
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                  'ev-click': send(subscribe, channel)
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                }, 'Subscribe')
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              )
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            ])
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          }, {maxTime: 5})
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        ]),
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        PeerList(localPeers, 'Local'),
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        PeerList(connectedPubs, 'Connected Pubs'),
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        when(computed(whoToFollow, x => x.length), h('h2', 'Who to follow')),
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        when(following.sync,
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          h('div', {
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            classList: 'ProfileList'
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          }, [
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            map(whoToFollow, (id) => {
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              return h('a.profile', {
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                href: id
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              }, [
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                h('div.avatar', [api.about.html.image(id)]),
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                h('div.main', [
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                  h('div.name', [ '@', api.about.obs.name(id) ])
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                ])
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              ])
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            })
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          ])
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        )
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      ]
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    }
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    function PeerList (ids, title) {
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      return [
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        when(computed(ids, x => x.length), h('h2', title)),
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        h('div', {
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          classList: 'ProfileList'
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        }, [
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          map(ids, (id) => {
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            return h('a.profile', {
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              classList: [ '-connected' ],
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              href: id
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            }, [
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              h('div.avatar', [api.about.html.image(id)]),
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              h('div.main', [
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                h('div.name', [ api.about.obs.name(id) ])
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              ]),
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              h('div.progress', [
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                api.progress.html.peer(id)
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              ])
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            ])
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          })
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        ])
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      ]
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    }
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    function getFeed (opts) {
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      if (opts.lt && opts.lt < oldest) {
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        opts = extend(opts, {lt: parseInt(opts.lt, 10)})
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        return pull(
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          api.sbot.pull.feed(opts),
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          pull.map((msg) => {
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            if (msg.sync) {
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              return msg
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            } else {
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              return {key: msg.key, value: msg.value, timestamp: msg.value.timestamp}
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            }
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          })
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        )
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      } else {
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        return api.sbot.pull.log(opts)
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      }
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    }
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    function getFirstMessage (feedId, cb) {
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      api.sbot.pull.userFeed({id: feedId, gte: 0, limit: 1})(null, cb)
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    }
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    function subscribe (id) {
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      api.message.async.publish({
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        type: 'channel',
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        channel: id,
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        subscribed: true
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      })
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    }
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    function unsubscribe (id) {
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      api.message.async.publish({
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        type: 'channel',
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        channel: id,
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        subscribed: false
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      })
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    }
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  }
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}
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function isMentioned (id, list) {
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  if (Array.isArray(list)) {
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    return list.includes(id)
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  } else {
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    return false
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  }
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}
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function fromDay (msg, fromTime) {
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  return (fromTime - msg.timestamp) < (24 * 60 * 60e3)
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}
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function arrayEq (a, b) {
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  if (Array.isArray(a) && Array.isArray(b) && a.length === b.length && a !== b) {
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    return a.every((value, i) => value === b[i])
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  }
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}
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