git ssb

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var nest = require('depnest')
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var { Dict, Set } = require('mutant')
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exports.gives = nest({
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  'unread.sync.isUnread': true,
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  'unread.sync.markRead': true,
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  'unread.obs.userMessages': true
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})
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// load current state of unread messages.
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exports.create = function (api) {
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  var unread = null
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  if (localStorage.unread) {
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    try {
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      unread = JSON.parse(localStorage.unread)
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    } catch (err) {}
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  }
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  if (!unread) { unread = {timestamp: Date.now()} }
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  unread.timestamp = unread.timestamp || Date.now()
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  if (!unread.filter) { unread.filter = {} }
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  var timer
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  function save () {
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    if (timer) return
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    timer = setTimeout(function () {
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      timer = null
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      localStorage.unread = JSON.stringify(unread)
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    }, 2e3)
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  }
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  function isUnread (msg) {
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    if (msg.timestamp && msg.timestamp < unread.timestamp) return false
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    return !unread.filter[msg.key]
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  }
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  function markRead (msg) {
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    if (msg && typeof msg.key === 'string') {
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      // note: there is a quirk where some messages don't have a timestamp
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      if (isUnread(msg)) {
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        var userUser
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        unread.filter[msg.key] = true
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        save()
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        return true
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      }
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    }
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  }
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  function userMessages (feedId) {
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  }
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  document.body.onunload = save
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  return nest({
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    'unread.sync.isUnread': isUnread,
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    'unread.sync.markRead': markRead,
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    'unread.obs.userMessages': userMessages
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  })
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}
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