git ssb

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const nest = require('depnest')
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const { h, when, send, resolve, Value, computed, map } = require('mutant')
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const assign = require('lodash/assign')
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const isEmpty = require('lodash/isEmpty')
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const ssbMentions = require('ssb-mentions')
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const addSuggest = require('suggest-box')
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exports.gives = nest('message.html.compose')
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exports.needs = nest({
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  'about.async.suggest': 'first',
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  'blob.html.input': 'first',
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  'channel.async.suggest': 'first',
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  'emoji.async.suggest': 'first',
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  'emoji.sync.names': 'first',
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  'emoji.sync.url': 'first',
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  'message.async.publish': 'first',
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  'message.html.markdown': 'first',
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  // 'message.html.confirm': 'first'
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  'translations.sync.strings': 'first'
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})
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exports.create = function (api) {
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  return nest('message.html.compose', compose)
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  function compose (options, cb) {
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    var {
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      meta, // required
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      feedIdsInThread = [],
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      placeholder,
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      shrink = true,
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      canAttach = true, canPreview = true,
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      prepublish
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    } = options
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    const strings = api.translations.sync.strings()
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    const getUserSuggestions = api.about.async.suggest()
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    const getChannelSuggestions = api.channel.async.suggest()
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    const getEmojiSuggestions = api.emoji.async.suggest()
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    placeholder = placeholder || strings.writeMessage
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    var files = []
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    var filesById = {}
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    var textAreaFocused = Value(false)
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    var focused = textAreaFocused
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    var hasContent = Value(false)
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    var blurTimeout = null
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    var expanded = computed([shrink, focused, hasContent], (shrink, focused, hasContent) => {
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      if (!shrink || hasContent) return true
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      return focused
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    })
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    var textRaw = Value('')
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    var textArea = h('textarea', {
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      'ev-input': () => textRaw.set(textArea.value),
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      'ev-blur': () => {
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        clearTimeout(blurTimeout)
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        blurTimeout = setTimeout(() => textAreaFocused.set(false), 200)
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      },
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      'ev-focus': send(textAreaFocused.set, true),
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      placeholder
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    })
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    textRaw(text => hasContent.set(!!text))
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    textArea.publish = publish // TODO: fix - clunky api for the keyboard shortcut to target
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    var fileInput
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    if (!meta.recps) {
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      fileInput = api.blob.html.input(file => {
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        files.push(file)
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        filesById[file.link] = file
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        var imgPrefix = file.type.match(/^image/) ? '!' : ''
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        var spacer = imgPrefix ? '\n' : ' '
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        var insertLink = spacer + imgPrefix + '[' + file.name + ']' + '(' + file.link + ')' + spacer
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        var pos = textArea.selectionStart
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        var newText = textRaw().slice(0, pos) + insertLink + textRaw().slice(pos)
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        textArea.value = newText
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        textRaw.set(newText)
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        console.log('added:', file)
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      })
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      fileInput.onclick = () => hasContent.set(true)
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    }
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    // if fileInput is null, send button moves to the left side
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    // and we don't want that.
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    else { fileInput = h('input', { style: {visibility: 'hidden'} }) }
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    function PreviewSetup (strings) {
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      var showPreview = Value(false)
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      var previewBtn = h('Button',
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        {
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          className: when(showPreview, '-strong', '-subtle'),
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          'ev-click': () => showPreview.set(!showPreview())
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        },
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        when(showPreview, strings.blogNew.actions.edit, strings.blogNew.actions.preview)
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      )
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      return { previewBtn, showPreview }
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    }
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    var { previewBtn, showPreview } = PreviewSetup(strings)
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    var preview = computed(textRaw, text => api.message.html.markdown(text))
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    var publishBtn = h('Button -primary', { 'ev-click': publish }, strings.sendMessage)
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    var actions = h('section.actions', [
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      canAttach ? fileInput : '',
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      canPreview ? previewBtn : '',
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      publishBtn
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    ])
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    var composer = h('Compose', {
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      classList: when(expanded, '-expanded', '-contracted')
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    }, [
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      when(showPreview, preview, textArea),
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      actions
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    ])
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    addSuggest(textArea, (inputText, cb) => {
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      const char = inputText[0]
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      const wordFragment = inputText.slice(1)
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      if (char === '@') cb(null, getUserSuggestions(wordFragment, feedIdsInThread))
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      if (char === '#') cb(null, getChannelSuggestions(wordFragment))
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      if (char === ':') cb(null, getEmojiSuggestions(wordFragment))
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    }, {cls: 'PatchSuggest'})
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    return composer
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    // scoped
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    function publish () {
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      if (publishBtn.disabled) return
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      const text = resolve(textRaw)
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      if (isEmpty(text)) return
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      publishBtn.disabled = true
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      const mentions = ssbMentions(text).map(mention => {
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        // merge markdown-detected mention with file info
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        var file = filesById[mention.link]
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        if (file) {
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          if (file.type) mention.type = file.type
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          if (file.size) mention.size = file.size
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        }
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        return mention
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      })
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      var content = assign({}, resolve(meta), {
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        text,
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        mentions
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      })
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      for (var k in content) { content[k] = resolve(content[k]) }
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      if (!content.channel) delete content.channel
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      if (!mentions.length) delete content.mentions
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      if (content.recps && content.recps.length === 0) delete content.recps
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      if (typeof prepublish === 'function') {
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        prepublish(content, function (err, content) {
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          if (err) handleErr(err)
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          else api.message.async.publish(content, done)
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        })
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      } else { api.message.async.publish(content, done) }
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      function done (err, msg) {
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        publishBtn.disabled = false
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        if (err) handleErr(err)
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        else if (msg) {
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          textRaw.set('')
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          textArea.value = ''
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        }
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        if (cb) cb(err, msg)
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      }
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      function handleErr (err) {
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        publishBtn.disabled = false
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        if (cb) cb(err)
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        else throw err
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      }
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    }
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  }
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}
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