git ssb

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var ui = require('../ui')
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var pull = require('pull-stream')
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var Cat = require('pull-cat')
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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 u = require('../util')
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var Scroller = require('pull-scroll')
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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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var plugs = require('../plugs')
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var message_render = plugs.first(exports.message_render = [])
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var message_compose = plugs.first(exports.message_compose = [])
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var message_unbox = plugs.first(exports.message_unbox = [])
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var sbot_get = plugs.first(exports.sbot_get = [])
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var sbot_links = plugs.first(exports.sbot_links = [])
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function getThread (root, sbot, 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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  return pull(Cat([
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    once(function (cb) {
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      sbot_get(root, function (err, value) {
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        cb(err, {key: root, value: value})
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      })
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    }),
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    sbot_links({rel: 'root', dest: root, values: true, keys: true})
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  ]), pull.collect(cb))
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}
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exports.screen_view = function (id, sbot) {
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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 content = h('div')
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    var div = h('div.column',
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      {style: {'overflow-y': 'auto'}},
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      content,
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      h('div.editor', message_compose(meta))
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    )
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    pull(
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      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, sbot, 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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        thread = thread.map(function (msg) {
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          return 'string' === typeof msg.value.content ? 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(message_render).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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        var recps = thread[0].value.content.recps
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        if(recps && thread[0].value.private)
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          meta.recps = recps
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      })
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    }
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    loadThread()
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    return div
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  }
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}
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