git ssb

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var nest = require('depnest')
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var {Struct, map, computed, watch} = require('mutant')
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exports.needs = nest({
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  'channel.obs.recent': 'first',
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  'channel.obs.subscribed': 'first',
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  'channel.obs.mostActive': 'first',
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  'keys.sync.id': 'first'
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})
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exports.gives = nest('channel.async.suggest')
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exports.create = function (api) {
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  var suggestions = null
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  var subscribed = null
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  return nest('channel.async.suggest', function () {
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    loadSuggestions()
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    return function (word) {
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      if (!word) {
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        return suggestions().slice(0, 200)
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      } else {
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        return suggestions().filter((item) => {
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          return matches(item.title, word)
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        })
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      }
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    }
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  })
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  function loadSuggestions () {
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    if (!suggestions) {
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      var id = api.keys.sync.id()
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      subscribed = api.channel.obs.subscribed(id)
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      var mostActive = api.channel.obs.mostActive()
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      var contacts = computed([subscribed, mostActive], function (a, b) {
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        var result = Array.from(a)
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        b.forEach((item, i) => {
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          if (!result.includes(item[0])) {
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            result.push(item)
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          }
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        })
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        return result
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      })
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      suggestions = map(contacts, suggestion, {idle: true})
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      watch(suggestions)
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    }
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  }
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  function suggestion (id) {
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    if (Array.isArray(id)) {
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      return Struct({
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        title: id[0],
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        id: `#${id[0]}`,
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        subtitle: computed([id[0], subscribed, `(${id[1]})`], subscribedCaption),
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        value: `#${id[0]}`
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      })
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    } else {
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      return Struct({
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        title: id,
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        id: `#${id}`,
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        subtitle: computed([id, subscribed], subscribedCaption),
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        value: `#${id}`
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      })
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    }
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  }
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}
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function subscribedCaption (id, subscribed, fallback) {
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  if (subscribed.has(id)) {
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    return 'subscribed'
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  } else {
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    return fallback || ''
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  }
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}
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function matches (text, startsWith) {
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  return text.slice(0, startsWith.length).localeCompare(startsWith, 'default', {sensitivity: 'base'}) === 0
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}
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