git ssb

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var pull = require('pull-stream')
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var sort = require('ssb-sort')
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var ref = require('ssb-ref')
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var h = require('hyperscript')
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var self_id = require('../keys').id
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function once (cont) {
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  var ended = false
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  return function (abort, cb) {
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    if(abort) return cb(abort)
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    else if (ended) return cb(ended)
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    else
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      cont(function (err, data) {
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        if(err) return cb(ended = err)
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        ended = true
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        cb(null, data)
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      })
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  }
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}
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exports.needs = {
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  build_scroller: 'first',
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  message_render: 'first',
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  message_name: 'first',
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  message_compose: 'first',
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  message_unbox: 'first',
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  sbot_get: 'first',
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  sbot_links: 'first'
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}
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exports.gives = 'screen_view'
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exports.create = function (api) {
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  function getThread (root, cb) {
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    //in this case, it's inconvienent that panel only takes
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    //a stream. maybe it would be better to accept an array?
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    api.sbot_get(root, function (err, value) {
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      if (err) return cb(err)
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      var msg = {key: root, value: value}
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  //    if(value.content.root) return getThread(value.content.root, cb)
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      pull(
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        api.sbot_links({rel: 'root', dest: root, values: true, keys: true}),
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        pull.collect(function (err, ary) {
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          if(err) return cb(err)
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          ary.unshift(msg)
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          cb(null, ary)
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        })
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      )
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    })
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  }
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  return function (id) {
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    if(ref.isMsg(id)) {
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      var meta = {
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        type: 'post',
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        root: id,
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        branch: id //mutated when thread is loaded.
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      }
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      var composer = api.message_compose(meta, {shrink: false, placeholder: 'Write a reply'})
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      var { container, content } = api.build_scroller({ append: composer })
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      api.message_name(id, function (err, name) {
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        container.title = name
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      })
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      pull(
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        api.sbot_links({
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          rel: 'root', dest: id, keys: true, old: false
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        }),
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        pull.drain(function (msg) {
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          loadThread() //redraw thread
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        }, function () {} )
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      )
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      function loadThread () {
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        getThread(id, function (err, thread) {
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          //would probably be better keep an id for each message element
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          //(i.e. message key) and then update it if necessary.
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          //also, it may have moved (say, if you received a missing message)
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          content.innerHTML = ''
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          if(err) return content.appendChild(h('pre', err.stack))
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          //decrypt
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          thread = thread.map(function (msg) {
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            return 'string' === typeof msg.value.content ? api.message_unbox(msg) : msg
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          })
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          if(err) return content.appendChild(h('pre', err.stack))
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          sort(thread).map(api.message_render).filter(Boolean).forEach(function (el) {
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            content.appendChild(el)
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          })
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          var branches = sort.heads(thread)
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          meta.branch = branches.length > 1 ? branches : branches[0]
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          meta.root = thread[0].value.content.root || thread[0].key
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          meta.channel = thread[0].value.content.channel
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          var recps = thread[0].value.content.recps
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          var priv = thread[0].value['private']
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          if(priv) {
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            if(recps)
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              meta.recps = recps
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            else
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              meta.recps = [thread[0].value.author, self_id]
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          }
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        })
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      }
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      loadThread()
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      return container
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    }
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  }
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}
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