git ssb

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var computed = require('mutant/computed')
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var nest = require('depnest')
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exports.needs = nest({
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  'keys.sync.id': 'first',
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  'contact.obs': {
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    followers: 'first',
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    following: 'first',
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    blockers: 'first'
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  }
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})
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exports.gives = nest('profile.obs.contact')
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exports.create = function (api) {
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  return nest('profile.obs.contact', function (id) {
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    var yourId = api.keys.sync.id()
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    var yourFollowing = api.contact.obs.following(yourId)
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    var yourFollowers = api.contact.obs.followers(yourId)
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    var followers = api.contact.obs.followers(id)
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    var following = api.contact.obs.following(id)
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    var sync = computed([followers.sync, following.sync], (...x) => x.every(Boolean))
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    var blockers = api.contact.obs.blockers(id)
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    var youBlock = computed(blockers, function (blockers) {
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      return blockers.includes(yourId)
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    })
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    var youFollow = computed([yourFollowing], function (yourFollowing) {
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      return yourFollowing.includes(id)
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    })
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    var blockingFriends = computed([yourFollowers, yourFollowing, blockers], inAllSets)
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    var mutualFriends = computed([yourFollowers, yourFollowing, followers, following], inAllSets)
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    var hasOutgoing = computed([yourFollowers, following], (a, b) => {
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      return a.some((id) => b.includes(id))
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    })
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    var hasIncoming = computed([followers, yourFollowing], (a, b) => {
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      return a.some((id) => b.includes(id))
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    })
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    var isYou = computed([yourId, id], (a, b) => a === b)
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    return {
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      followers,
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      following,
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      blockers,
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      blockingFriends,
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      blockingFriendsCount: count(blockingFriends),
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      mutualFriends,
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      mutualFriendsCount: count(mutualFriends),
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      hasOutgoing,
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      noOutgoing: not(hasOutgoing, isYou),
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      hasIncoming,
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      noIncoming: not(hasIncoming, isYou),
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      yourId,
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      yourFollowing,
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      yourFollowers,
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      youFollow,
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      youBlock,
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      isYou,
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      notFollowing: not(youFollow, isYou),
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      sync
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    }
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  })
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}
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function inAllSets (first, ...rest) {
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  return first.filter(value => rest.every((collection) => collection.includes(value)))
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}
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function not (obs, isFalse) {
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  return computed([obs, isFalse], (x, isFalse) => isFalse ? false : !x)
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}
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function count (obs) {
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  return computed(obs, (x) => x.length)
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}
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