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var pull = require('pull-stream')
var multicb = require('multicb')
function accumulateNonNull(a, b) {
return b == null ? a : b
}
module.exports = function (sbot, id, cb) {
var followed = {}, followedBy = {}, blocked = {}, blockedBy = {}
var done = multicb({pluck: 1})
pull(
sbot.links2.read({
reverse: true, // oldest first. ssb-links has this switched
query: [
{$filter: {
source: id,
rel: [{$prefix: 'contact'}]
}},
{$reduce: {
id: 'dest',
following: {$collect: ['rel', 1]},
blocking: {$collect: ['rel', 2]}
}}
]
}),
pull.drain(function (op) {
var following = op.following.reduce(accumulateNonNull, null)
var blocking = op.blocking.reduce(accumulateNonNull, null)
if (following != null) followed[op.id] = following
if (blocking != null) blocked[op.id] = blocking
}, done())
)
pull(
sbot.links2.read({
reverse: true, // oldest first. ssb-links has this switched
query: [
{$filter: {
dest: id,
rel: [{$prefix: 'contact'}]
}},
{$reduce: {
id: 'source',
following: {$collect: ['rel', 1]},
blocking: {$collect: ['rel', 2]}
}}
]
}),
pull.drain(function (op) {
var following = op.following.reduce(accumulateNonNull, null)
var blocking = op.blocking.reduce(accumulateNonNull, null)
if (following != null) followedBy[op.id] = following
if (blocking != null) blockedBy[op.id] = blocking
}, done())
)
done(function (err) {
if (err) return cb(new Error(err.stack || err))
var id
var friendsList = []
var followingList = []
var blockingList = []
var followedByList = []
var blockedByList = []
for (id in followed) {
if (followed[id]) {
if (followedBy[id]) friendsList.push(id)
else followingList.push(id)
}
}
for (id in followedBy) {
if (followedBy[id] && !followed[id]) {
followedByList.push(id)
}
}
for (id in blocked) {
if (blocked[id]) blockingList.push(id)
}
for (id in blockedBy) {
if (blockedBy[id]) blockedByList.push(id)
}
cb(null, {
follows: followingList,
followers: followedByList,
friends: friendsList,
blocks: blockingList,
blockers: blockedByList
})
})
}
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