git ssb

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var pull = require('pull-stream')
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var paramap = require('pull-paramap')
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var plugs = require('patchbay/plugs')
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var cont = require('cont')
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var ref = require('ssb-ref')
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var sbot_log = plugs.first(exports.sbot_log = [])
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var sbot_get = plugs.first(exports.sbot_get = [])
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var sbot_user_feed = plugs.first(exports.sbot_user_feed = [])
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var message_unbox = plugs.first(exports.message_unbox = [])
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var get_id = plugs.first(exports.get_id = [])
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var feed_summary = plugs.first(exports.feed_summary = [])
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exports.screen_view = function (path) {
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  if (path === '/notifications') {
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    var oldest = null
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    var id = get_id()
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    var ids = {
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      [id]: true
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    }
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    getFirstMessage(id, function (err, msg) {
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      if (err) return console.error(err)
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      if (!oldest || msg.value.timestamp < oldest) {
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        oldest = msg.value.timestamp
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      }
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    })
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    return feed_summary((opts) => {
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      if (opts.old === false) {
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        return pull(
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          sbot_log(opts),
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          unbox(),
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          notifications(ids),
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          pull.filter()
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        )
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      } else {
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        return pull(
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          sbot_log(opts),
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          unbox(),
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          notifications(ids),
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          pull.filter(),
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          pull.take(function (msg) {
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            // abort stream after we pass the oldest messages of our feeds
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            return !oldest || msg.value.timestamp > oldest
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          })
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        )
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      }
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    }, [], {
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      windowSize: 200,
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      filter: (group) => {
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        return (
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          ((group.message || group.type !== 'message') && (group.author !== id || group.digs && group.digs.size)) || (
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            group.repliesFrom && group.repliesFrom.size && (
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              !group.repliesFrom.has(id) || group.repliesFrom.size > 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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  }
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}
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function unbox () {
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  return pull(
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    pull.map(function (msg) {
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      return msg.value && typeof msg.value.content === 'string'
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        ? message_unbox(msg)
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        : msg
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    }),
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    pull.filter(Boolean)
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  )
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}
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function notifications (ourIds) {
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  function linksToUs (link) {
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    return link && link.link in ourIds
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  }
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  function isOurMsg (id, cb) {
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    if (!id) return cb(null, false)
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    if (typeof id === 'object' && typeof id.link === 'string') id = id.link
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    if (!ref.isMsg(id)) return cb(null, false)
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    sbot_get(id, function (err, msg) {
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      if (err && err.name === 'NotFoundError') cb(null, false)
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      else if (err) cb(err)
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      else if (msg.content.type === 'issue' || msg.content.type === 'pull-request') {
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        isOurMsg(msg.content.repo || msg.content.project, cb)
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      } else {
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        cb(err, msg.author in ourIds)
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      }
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    })
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  }
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  function isAnyOurMessage (msg, ids, cb) {
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    cont.para(ids.map(function (id) {
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      return function (cb) { isOurMsg(id, cb) }
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    }))(function (err, results) {
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      if (err) cb(err)
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      else if (results.some(Boolean)) cb(null, msg)
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      else cb()
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    })
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  }
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  return paramap(function (msg, cb) {
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    var c = msg.value && msg.value.content
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    if (!c || typeof c !== 'object') return cb()
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    if (msg.value.author in ourIds) return cb(null, msg)
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    if (c.mentions && Array.isArray(c.mentions) && c.mentions.some(linksToUs)) {
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      return cb(null, msg)
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    }
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    if (msg.private) {
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      return cb(null, msg)
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    }
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    switch (c.type) {
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      case 'post':
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        if (c.branch || c.root) {
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          return isAnyOurMessage(msg, [].concat(c.branch, c.root), cb)
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        } else {
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          return cb()
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        }
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      case 'contact':
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        return cb(null, c.contact in ourIds ? msg : null)
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      case 'vote':
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        if (c.vote && c.vote.link)
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          return isOurMsg(c.vote.link, function (err, isOurs) {
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            cb(err, isOurs ? msg : null)
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          })
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          else return cb()
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      case 'issue':
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      case 'pull-request':
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        return isOurMsg(c.project || c.repo, function (err, isOurs) {
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          cb(err, isOurs ? msg : null)
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        })
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      case 'issue-edit':
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        return isAnyOurMessage(msg, [c.issue].concat(c.issues), cb)
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      default:
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        cb()
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    }
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  }, 4)
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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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