git ssb

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var Value = require('@mmckegg/mutant/value')
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var h = require('@mmckegg/mutant/html-element')
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var when = require('@mmckegg/mutant/when')
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var computed = require('@mmckegg/mutant/computed')
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var MutantArray = require('@mmckegg/mutant/array')
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var Abortable = require('pull-abortable')
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var Scroller = require('../lib/pull-scroll')
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var FeedSummary = require('../lib/feed-summary')
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var onceTrue = require('../lib/once-true')
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var m = require('../lib/h')
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var pull = require('pull-stream')
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var plugs = require('patchbay/plugs')
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var message_render = plugs.first(exports.message_render = [])
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var message_link = plugs.first(exports.message_link = [])
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var person = plugs.first(exports.person = [])
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var many_people = plugs.first(exports.many_people = [])
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var people_names = plugs.first(exports.people_names = [])
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var sbot_get = plugs.first(exports.sbot_get = [])
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exports.feed_summary = function (getStream, prefix, opts) {
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  var sync = Value(false)
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  var updates = Value(0)
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  var filter = opts && opts.filter
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  var windowSize = opts && opts.windowSize
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  var waitFor = opts && opts.waitFor || true
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  var updateLoader = m('a Notifier -loader', {
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    href: '#',
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    'ev-click': refresh
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  }, [
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    'Show ',
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    h('strong', [updates]), ' ',
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    when(computed(updates, a => a === 1), 'update', 'updates')
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  ])
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  var content = h('div.column.scroller__content')
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  var scrollElement = h('div.column.scroller', {
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    style: {
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      'overflow': 'auto'
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    }
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  }, [
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    h('div.scroller__wrapper', [
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      prefix, content
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    ])
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  ])
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  setTimeout(refresh, 10)
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  onceTrue(waitFor, () => {
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    pull(
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      getStream({old: false}),
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      pull.drain((item) => {
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        var type = item && item.value && item.value.content.type
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        if (type && type !== 'vote') {
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          if (filter) {
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            var update = (item.value.content.type === 'post' && item.value.content.root) ? {
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              type: 'message',
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              messageId: item.value.content.root,
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              channel: item.value.content.channel
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            } : {
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              type: 'message',
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              author: item.value.author,
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              channel: item.value.content.channel,
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              messageId: item.key
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            }
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            ensureAuthor(update, (err, update) => {
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              if (!err) {
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                if (filter(update)) {
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                  updates.set(updates() + 1)
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                }
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              }
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            })
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          } else {
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            updates.set(updates() + 1)
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          }
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        }
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      })
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    )
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  })
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  var abortLastFeed = null
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  return MutantArray([
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    when(updates, updateLoader),
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    when(sync, scrollElement, m('Loading -large'))
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  ])
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  // scoped
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  function refresh () {
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    if (abortLastFeed) {
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      abortLastFeed()
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    }
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    updates.set(0)
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    sync.set(false)
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    content.innerHTML = ''
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    var abortable = Abortable()
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    abortLastFeed = abortable.abort
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    pull(
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      FeedSummary(getStream, windowSize, () => {
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        sync.set(true)
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      }),
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      pull.asyncMap(ensureAuthor),
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      pull.filter((item) => {
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        if (filter) {
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          return filter(item)
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        } else {
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          return true
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        }
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      }),
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      abortable,
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      Scroller(scrollElement, content, renderItem, false, false)
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    )
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  }
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}
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function ensureAuthor (item, cb) {
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  if (item.type === 'message' && !item.message) {
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    sbot_get(item.messageId, (_, value) => {
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      if (value) {
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        item.author = value.author
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      }
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      cb(null, item)
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    })
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  } else {
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    cb(null, item)
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  }
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}
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function renderItem (item) {
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  if (item.type === 'message') {
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    var meta = null
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    var replies = item.replies.slice(-4).map(m => message_render(m, true))
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    var renderedMessage = item.message ? message_render(item.message, true) : null
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    if (renderedMessage) {
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      if (item.lastUpdateType === 'reply' && item.repliesFrom.size) {
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        meta = m('div.meta', {
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          title: people_names(item.repliesFrom)
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        }, [
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          many_people(item.repliesFrom), ' replied'
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        ])
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      } else if (item.lastUpdateType === 'dig' && item.digs.size) {
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        meta = m('div.meta', {
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          title: people_names(item.digs)
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        }, [
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          many_people(item.digs), ' dug this message'
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        ])
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      }
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      return m('FeedEvent', [
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        meta,
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        renderedMessage,
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        when(replies.length, [
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          when(item.replies.length > replies.length,
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            m('a.full', {href: `#${item.messageId}`}, ['View full thread'])
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          ),
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          m('div.replies', replies)
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        ])
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      ])
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    } else {
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      if (item.lastUpdateType === 'reply' && item.repliesFrom.size) {
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        meta = m('div.meta', {
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          title: people_names(item.repliesFrom)
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        }, [
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          many_people(item.repliesFrom), ' replied to ', message_link(item.messageId)
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        ])
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      } else if (item.lastUpdateType === 'dig' && item.digs.size) {
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        meta = m('div.meta', {
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          title: people_names(item.digs)
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        }, [
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          many_people(item.digs), ' dug ', message_link(item.messageId)
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        ])
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      }
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      if (meta || replies.length) {
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        return m('FeedEvent', [
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          meta, m('div.replies', replies)
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        ])
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      }
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    }
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  } else if (item.type === 'follow') {
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    return m('FeedEvent -follow', [
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      m('div.meta', {
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        title: people_names(item.contacts)
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      }, [
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        person(item.id), ' followed ', many_people(item.contacts)
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      ])
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    ])
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  }
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  return h('div')
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}
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