git ssb

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const nest = require('depnest')
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const { h, Value, when, computed, resolve } = require('mutant')
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const Abort = require('pull-abortable')
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const pull = require('pull-stream')
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const addSuggest = require('suggest-box')
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const get = require('lodash/get')
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const isEqual = require('lodash/isEqual')
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const isEmpty = require('lodash/isEmpty')
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const { isFeed } = require('ssb-ref')
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exports.gives = nest('app.html.filter')
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exports.needs = nest({
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  'about.async.suggest': 'first',
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  'channel.async.suggest': 'first',
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  'contact.obs.following': 'first',
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  'channel.obs.subscribed': 'first',
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  'keys.sync.id': 'first',
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  'settings.obs.get': 'first',
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  'settings.sync.set': 'first'
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})
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exports.create = function (api) {
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  return nest({
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    'app.html.filter': Filter
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  })
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  function Filter (draw) {
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    const showFilters = Value(false)
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    const myId = api.keys.sync.id()
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    const peopleIFollow = api.contact.obs.following(myId)
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    const channelsIFollow = api.channel.obs.subscribed(myId)
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    const filterSettings = api.settings.obs.get('filter', { exclude: {} })
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    const channelInput = h('input', {
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      value: filterSettings().exclude.channels,
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      'ev-keyup': (ev) => {
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        var text = ev.target.value
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        if (text.length === 0 || ev.which === 13) {
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          api.settings.sync.set({
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            filter: {
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              exclude: {
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                channels: text
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              }
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            }
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          })
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          draw()
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        }
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      }
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    })
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    var userId = Value('')
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    userId(id => {
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      userInput.value = id
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      draw()
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    })
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    const userInput = h('input', {
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      'ev-input': (ev) => {
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        const { value } = ev.target
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        if (value === resolve(userId)) return // stops infinite loop
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        if (isFeed(value)) userId.set(value)
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        else if (isEmpty(value)) userId.set('')
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      }
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    })
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    const isFiltered = computed(filterSettings, (filterSettings) => {
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      const _settings = Object.assign({}, filterSettings)
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      delete _settings.defaults
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      return !isEqual(_settings, filterSettings.defaults)
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    })
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    const filterMenu = h('Filter', [
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      when(isFiltered, h('i.custom')),
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      h('i.fa.fa-filter', {
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        classList: when(showFilters, '-active'),
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        'ev-click': () => showFilters.set(!showFilters())
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      }),
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      h('i.fa.fa-angle-up', { 'ev-click': draw }),
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      h('div.options', { className: when(showFilters, '', '-hidden') }, [
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        h('header', [
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          'Filter',
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          h('i.fa.fa-filter')
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        ]),
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        h('section', [
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          h('div.users', [
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            toggle({ type: 'peopleAndChannelsIFollow', filterGroup: 'only', label: 'Only people & channels I follow' }),
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            h('div.user-filter', [
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              h('label', 'Only this user (temporary filter):'),
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              userInput
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            ])
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          ]),
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          h('div.channels', [
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            h('label', 'Exclude channels'),
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            channelInput
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          ]),
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          h('div.message-types', [
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            h('header', 'Show messages'),
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            toggle({ type: 'post' }),
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            toggle({ type: 'like' }),
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            toggle({ type: 'about' }),
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            toggle({ type: 'contact' }),
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            toggle({ type: 'channel' }),
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            toggle({ type: 'pub' }),
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            toggle({ type: 'private' }),
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            toggle({ type: 'chess' })
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          ]),
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          h('div.root-messages', [
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            toggle({ type: 'rootMessages', filterGroup: 'only', label: 'Root messages only' })
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          ])
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        ])
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      ])
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    ])
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    function toggle ({ type, filterGroup, label }) {
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      label = label || type
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      filterGroup = filterGroup || 'show'
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      const state = computed(filterSettings, settings => get(settings, [filterGroup, type]))
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      const handleClick = () => {
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        const currentState = state()
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        // TODO use some lodash tool ?
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        api.settings.sync.set({
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          filter: {
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            [filterGroup]: {
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              [type]: !currentState
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            }
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          }
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        })
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        draw()
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      }
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      return h('FilterToggle', { 'ev-click': handleClick }, [
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        h('label', label),
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        h('i', { classList: when(state, 'fa fa-check-square-o', 'fa fa-square-o') })
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      ])
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    }
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    addSuggest(channelInput, (inputText, cb) => {
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      if (inputText[0] === '#') {
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        api.channel.async.suggest(inputText.slice(1), cb)
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      }
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    }, { cls: 'PatchSuggest' })
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    channelInput.addEventListener('suggestselect', ev => {
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      const channels = channelInput.value.trim()
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      api.settings.sync.set({ filter: { exclude: { channels: channels } } })
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      draw()
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    })
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    addSuggest(userInput, (inputText, cb) => {
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      inputText = inputText.replace(/^@/, '')
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      api.about.async.suggest(inputText, cb)
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    }, { cls: 'PatchSuggest' })
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    userInput.addEventListener('suggestselect', ev => userId.set(ev.detail.id))
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    function followFilter (msg) {
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      if (!filterSettings().only.peopleAndChannelsIFollow) return true
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      return (msg.value && Array.from(peopleIFollow()).concat(myId).includes(msg.value.author)) ||
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             (msg.value && msg.value.content && Array.from(channelsIFollow()).includes(msg.value.content.channel))
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    }
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    function userFilter (msg) {
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      const id = resolve(userId)
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      if (!id) return true
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      return msg.value.author === id
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    }
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    function rootFilter (msg) {
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      if (!filterSettings().only.rootMessages) return true
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      return !msg.value.content.root
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    }
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    function channelFilter (msg) {
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      var filters = filterSettings().exclude.channels
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      if (!filters) return true
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      filters = filters.split(' ').map(c => c.slice(1))
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      return msg.value.content && !filters.includes(msg.value.content.channel)
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    }
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    function messageFilter (msg) {
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      var { type } = msg.value.content
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      if (/^chess/.test(type)) {
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        type = 'chess'
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      }
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      if (typeof msg.value.content === 'string') {
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        type = 'private'
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      }
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      return get(filterSettings(), ['show', type], true)
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    }
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    var downScrollAborter
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    function filterDownThrough () {
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      return pull(
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        downScrollAborter,
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        pull.filter(msg => msg),
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        pull.filter(followFilter),
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        pull.filter(userFilter),
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        pull.filter(rootFilter),
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        pull.filter(channelFilter),
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        pull.filter(messageFilter)
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      )
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    }
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    var upScrollAborter
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    function filterUpThrough () {
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      return pull(
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        upScrollAborter,
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        pull.filter(msg => msg),
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        pull.filter(followFilter),
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        pull.filter(userFilter),
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        pull.filter(rootFilter),
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        pull.filter(channelFilter),
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        pull.filter(messageFilter)
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      )
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    }
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    function resetFeed ({ container, content }) {
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      if (typeof upScrollAborter === 'function') {
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        upScrollAborter.abort()
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        downScrollAborter.abort()
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      }
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      upScrollAborter = Abort()
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      downScrollAborter = Abort()
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      container.keyboardScroll(0)
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      content.innerHTML = ''
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    }
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    return {
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      filterMenu,
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      filterDownThrough,
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      filterUpThrough,
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      resetFeed
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    }
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  }
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}
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