git ssb

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var nest = require('depnest')
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var extend = require('xtend')
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var pull = require('pull-stream')
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var { h, send, when, computed, map, onceTrue } = require('mutant')
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exports.needs = nest({
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  sbot: {
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    obs: {
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      connectedPeers: 'first',
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      localPeers: 'first',
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      connection: 'first'
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    }
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  },
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  'sbot.pull.stream': 'first',
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  'feed.pull.public': 'first',
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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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  'message.sync.root': '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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  'profile.obs.contact': 'first',
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  'contact.obs.following': 'first',
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  'contact.obs.blocking': '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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  'channel.sync.normalize': 'first',
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  'keys.sync.id': 'first',
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  'settings.obs.get': 'first',
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  'intl.sync.i18n': '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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  const i18n = api.intl.sync.i18n
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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 blocking = api.contact.obs.blocking(id)
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    var subscribedChannels = api.channel.obs.subscribed(id)
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    var recentChannels = api.channel.obs.recent()
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    var loading = computed([subscribedChannels.sync, recentChannels.sync], (...args) => !args.every(Boolean))
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    var channels = computed(recentChannels, 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 contact = api.profile.obs.contact(id)
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    var prepend = [
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      api.message.html.compose({ meta: { type: 'post' }, placeholder: i18n('Write a public message') })
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    ]
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    var lastMessage = null
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    var getStream = (opts) => {
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      if (!opts.lt) {
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        // HACK: reset the isReplacementMessage check
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        lastMessage = null
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      }
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      if (opts.lt != null && !opts.lt.marker) {
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        // if an lt has been specified that is not a marker, assume stream is finished
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        return pull.empty()
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      } else {
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        return api.sbot.pull.stream(sbot => sbot.patchwork.roots(extend(opts, {
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          ids: [id],
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          onlySubscribedChannels: filters() && filters().onlySubscribed
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        })))
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      }
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    }
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    var filters = api.settings.obs.get('filters')
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    var feedView = api.feed.html.rollup(getStream, {
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      prepend,
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      prefiltered: true, // we've already filtered out the roots we don't want to include
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      updateStream: api.sbot.pull.stream(sbot => sbot.patchwork.latest({ids: [id]})),
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      bumpFilter: function (msg) {
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        // this needs to match the logic in sbot/roots so that we display the
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        // correct bump explainations
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        if (msg.value && msg.value.content && typeof msg.value.content === 'object') {
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          var type = msg.value.content.type
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          if (type === 'vote') return false
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          var author = msg.value.author
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          if (id === author || following().includes(author)) {
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            return true
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          } else if (matchesSubscribedChannel(msg)) {
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            return 'matches-channel'
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          }
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        }
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      },
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      rootFilter: function (msg) {
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        // skip messages that are directly replaced by the previous message
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        // e.g. follow / unfollow in quick succession
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        // THIS IS A TOTAL HACK!!! SHOULD BE REPLACED WITH A PROPER ROLLUP!
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        var isOutdated = isReplacementMessage(msg, lastMessage)
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        if (checkFeedFilter(msg) && !isOutdated) {
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          lastMessage = msg
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          return true
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        }
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      },
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      compactFilter: function (msg, root) {
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        if (!root && api.message.sync.root(msg)) {
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          // msg has a root, but is being displayed as root (fork)
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          return true
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        }
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      },
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      waitFor: 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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    })
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    // call reload whenever filters changes (equivalent to the refresh from inside rollup)
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    filters(feedView.reload)
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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', [
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        when(
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          computed([contact.isNotFollowingAnybody, loading], (a,b) => a && !b),
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           renderNoVisiblePostsWarning(i18n)
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         ),
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         feedView])
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    ])
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    result.pendingUpdates = feedView.pendingUpdates
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    result.reload = function () {
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      feedView.reload()
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    }
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    return result
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    function checkFeedFilter (root) {
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      if (filters()) {
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        if (filters().following && getType(root) === 'contact') return false
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      }
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      return true
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    }
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    function matchesSubscribedChannel (msg) {
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      if (msg.filterResult) {
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        return msg.filterResult.matchesChannel || msg.filterResult.matchingTags.length
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      } else {
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        var channel = api.channel.sync.normalize(msg.value.content.channel)
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        var tagged = checkTag(msg.value.content.mentions)
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        var isSubscribed = channel ? subscribedChannels().has(channel) : false
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        return isSubscribed || tagged
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      }
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    }
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    function checkTag (mentions) {
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      if (Array.isArray(mentions)) {
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        return mentions.some((mention) => {
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          if (mention && typeof mention.link === 'string' && mention.link.startsWith('#')) {
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            var channel = api.channel.sync.normalize(mention.link.slice(1))
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            return channel ? subscribedChannels().has(channel) : false
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          }
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        })
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      }
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    }
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    function getSidebar () {
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      var whoToFollow = computed([api.profile.obs.recentlyUpdated(), following, blocking, localPeers], (recent, ...ignoreFeeds) => {
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        return recent.filter(x => x !== id && !ignoreFeeds.some(f => f.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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        }, i18n('+ Join Pub')),
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        when(loading, [ h('Loading') ], [
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          when(computed(channels, x => x.length), h('h2', i18n('Active Channels'))),
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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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                  }, i18n('Unsubscribe')),
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                  h('a.-subscribe', {
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                    'ev-click': send(subscribe, channel)
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                  }, i18n('Subscribe'))
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                )
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              ])
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            }, {maxTime: 5}),
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            h('a.channel -more', {href: '/channels'}, i18n('More Channels...'))
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          ])
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        ]),
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        PeerList(localPeers, i18n('Local')),
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        PeerList(connectedPubs, i18n('Connected Pubs')),
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        when(computed(whoToFollow, x => x.length), h('h2', i18n('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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            var connected = computed([connectedPeers, id], (peers, id) => peers.includes(id))
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            return h('a.profile', {
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              classList: [
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                when(connected, '-connected')
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              ],
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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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              h('div.controls', [
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                h('a.disconnect', {href: '#disconnect', 'ev-click': send(disconnect, id), title: i18n('Force Disconnect')}, ['x'])
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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 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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    function disconnect (id) {
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      onceTrue(api.sbot.obs.connection, (sbot) => {
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        sbot.patchwork.disconnect(id)
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      })
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    }
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  }
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}
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function renderNoVisiblePostsWarning(i18n) {
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  return  h('div', {classList: 'PublicFeed main'}, h('section -notFollowingAnyoneWarning', [
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    h('h1', i18n('You are not following anybody.')),
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    h('h3', i18n(`You may not be able to see new posts and replies.`)),
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    h('h3', i18n('You can only see new posts from people you follow, and people that they follow.')),
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    h('h3', i18n('Follow one or more users to see some new posts.'))
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  ]))
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}
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function getType (msg) {
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  return msg && msg.value && msg.value.content && msg.value.content.type
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}
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function hasChannel (msg) {
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  return getType(msg) !== 'channel' && msg && msg.value && msg.value.content && !!msg.value.content.channel
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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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function isReplacementMessage (msgA, msgB) {
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  if (msgA && msgB && msgA.value.content && msgB.value.content && msgA.value.content.type === msgB.value.content.type) {
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    if (msgA.key === msgB.key) return false
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    var type = msgA.value.content.type
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    if (type === 'contact') {
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      return msgA.value.author === msgB.value.author && msgA.value.content.contact === msgB.value.content.contact
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    }
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  }
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}
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