git ssb

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var MutantMap = require('@mmckegg/mutant/map')
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var computed = require('@mmckegg/mutant/computed')
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var when = require('@mmckegg/mutant/when')
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var send = require('@mmckegg/mutant/send')
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var pull = require('pull-stream')
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var extend = require('xtend')
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var plugs = require('patchbay/plugs')
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var h = require('../lib/h')
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var message_compose = plugs.first(exports.message_compose = [])
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var sbot_log = plugs.first(exports.sbot_log = [])
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var sbot_feed = plugs.first(exports.sbot_feed = [])
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var sbot_user_feed = plugs.first(exports.sbot_user_feed = [])
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var feed_summary = plugs.first(exports.feed_summary = [])
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var obs_channels = plugs.first(exports.obs_channels = [])
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var obs_subscribed_channels = plugs.first(exports.obs_subscribed_channels = [])
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var get_id = plugs.first(exports.get_id = [])
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var publish = plugs.first(exports.sbot_publish = [])
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var obs_following = plugs.first(exports.obs_following = [])
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var obs_recently_updated_feeds = plugs.first(exports.obs_recently_updated_feeds = [])
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var avatar_image = plugs.first(exports.avatar_image = [])
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var avatar_name = plugs.first(exports.avatar_name = [])
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var obs_local = plugs.first(exports.obs_local = [])
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var obs_connected = plugs.first(exports.obs_connected = [])
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exports.screen_view = function (path, sbot) {
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  if (path === '/public') {
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    var id = get_id()
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    var channels = computed(obs_channels(), items => items.slice(0, 8), {comparer: arrayEq})
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    var subscribedChannels = obs_subscribed_channels(id)
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    var loading = computed(subscribedChannels.sync, x => !x)
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    var connectedPeers = obs_connected()
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    var localPeers = obs_local()
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    var connectedPubs = computed([connectedPeers, localPeers], (c, l) => c.filter(x => !l.includes(x)))
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    var following = obs_following(id)
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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 whoToFollow = computed([obs_following(id), obs_recently_updated_feeds(200)], (following, recent) => {
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      return Array.from(recent).filter(x => x !== id && !following.has(x)).slice(0, 10)
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    })
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    return h('SplitView', [
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      h('div.side', [
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        h('h2', 'Active Channels'),
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        when(loading, [ h('Loading') ]),
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        h('ChannelList', {
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          hidden: loading
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        }, [
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          MutantMap(channels, (channel) => {
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            var subscribed = subscribedChannels.has(channel.id)
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            return h('a.channel', {
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              href: `##${channel.id}`,
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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.id),
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              when(subscribed,
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                h('a -unsubscribe', {
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                  'ev-click': send(unsubscribe, channel.id)
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                }, 'Unsubscribe'),
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                h('a -subscribe', {
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                  'ev-click': send(subscribe, channel.id)
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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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        when(computed(localPeers, x => x.length), h('h2', 'Local')),
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        h('ProfileList', [
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          MutantMap(localPeers, (id) => {
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            return h('a.profile', {
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              classList: [
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                when(computed([connectedPeers, id], (p, id) => p.includes(id)), '-connected')
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              ],
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              href: `#${id}`
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            }, [
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              h('div.avatar', [avatar_image(id)]),
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              h('div.main', [
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                h('div.name', [ avatar_name(id) ])
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              ])
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            ])
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          })
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        ]),
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        when(computed(whoToFollow, x => x.length), h('h2', 'Who to follow')),
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        h('ProfileList', [
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          MutantMap(whoToFollow, (id) => {
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            return h('a.profile', {
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              href: `#${id}`
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            }, [
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              h('div.avatar', [avatar_image(id)]),
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              h('div.main', [
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                h('div.name', [ avatar_name(id) ])
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              ])
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            ])
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          })
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        ]),
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        when(computed(connectedPubs, x => x.length), h('h2', 'Connected Pubs')),
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        h('ProfileList', [
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          MutantMap(connectedPubs, (id) => {
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            return h('a.profile', {
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              classList: [ '-connected' ],
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              href: `#${id}`
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            }, [
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              h('div.avatar', [avatar_image(id)]),
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              h('div.main', [
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                h('div.name', [ avatar_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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      h('div.main', [
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        feed_summary(getFeed, [
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          message_compose({type: 'post'}, {placeholder: 'Write a public message'})
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        ], {
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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 (
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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.digs && item.digs.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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      ])
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    ])
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  }
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  // scoped
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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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        sbot_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 sbot_log(opts)
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    }
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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 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 subscribe (id) {
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  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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  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 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 getFirstMessage (feedId, cb) {
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  sbot_user_feed({id: feedId, gte: 0, limit: 1})(null, cb)
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}
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