var Sort = require('ssb-sort')
var Reduce = require('./reduce')
var pull = require('pull-stream')

module.exports = function (sbot, id, cb) {
  sbot.get(id, function (err, msg) {
    pull(
      sbot.links({
        dest: id, values: true
      }),
      pull.collect(function (err, ary) {
        ary = ary.filter(function (e) {
          return e.value.content.type == 'tag' || e.value.content.type == 'about'
        })
        ary.unshift({key: id, value:msg})
        ary = Sort(ary)
        var tag = ary.reduce(Reduce, null)
        tag.branch = Sort.heads(ary)
        cb(null, tag)
      })
    )
  })
}