git ssb

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var h = require('mutant/h')
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var when = require('mutant/when')
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var send = require('mutant/send')
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var resolve = require('mutant/resolve')
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var Value = require('mutant/value')
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var computed = require('mutant/computed')
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var nest = require('depnest')
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var mentions = require('ssb-mentions')
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var extend = require('xtend')
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var addSuggest = require('suggest-box')
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exports.needs = nest({
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  'blob.html.input': 'first',
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  'profile.async.suggest': 'first',
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  'channel.async.suggest': 'first',
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  'message.async.publish': 'first',
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  'emoji.sync.names': 'first',
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  'emoji.sync.url': 'first'
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})
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exports.gives = nest('message.html.compose')
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exports.create = function (api) {
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  return nest('message.html.compose', function ({shrink = true, meta, prepublish, placeholder = 'Write a message'}, cb) {
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    var files = []
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    var filesById = {}
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    var focused = Value(false)
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    var hasContent = Value(false)
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    var publishing = Value(false)
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    var getProfileSuggestions = api.profile.async.suggest()
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    var getChannelSuggestions = api.channel.async.suggest()
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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) {
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        return true
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      } else {
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        return focused
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      }
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    })
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    var textArea = h('textarea', {
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      'ev-input': function () {
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        hasContent.set(!!textArea.value)
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      },
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      'ev-blur': () => {
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        clearTimeout(blurTimeout)
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        blurTimeout = setTimeout(() => focused.set(false), 200)
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      },
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      'ev-focus': send(focused.set, true),
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      disabled: publishing,
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      placeholder
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    })
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    var warningMessage = Value(null)
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    var warning = h('section.warning',
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      { className: when(warningMessage, '-open', '-closed') },
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      [
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        h('div.warning', warningMessage),
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        h('div.close', { 'ev-click': () => warningMessage.set(null) }, 'x')
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      ]
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    )
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    var fileInput = api.blob.html.input(file => {
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      const megabytes = file.size / 1024 / 1024
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      if (megabytes >= 5) {
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        const rounded = Math.floor(megabytes*100)/100
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        warningMessage.set([
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          h('i.fa.fa-exclamation-triangle'),
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          h('strong', file.name),
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          ` is ${rounded}MB - the current limit is 5MB`
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        ])
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        return
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      }
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      files.push(file)
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      filesById[file.link] = file
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      var embed = file.type.indexOf('image/') === 0 ? '!' : ''
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      var pos = textArea.selectionStart
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      var before = textArea.value.slice(0, pos)
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      var after = textArea.value.slice(pos)
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      var spacer = embed ? '\n' : ' '
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      if (before && !before.endsWith(spacer)) before += spacer
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      if (!after.startsWith(spacer)) after = spacer + after
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      textArea.value = `${before}${embed}[${file.name}](${file.link})${after}`
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      console.log('added:', file)
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    })
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    fileInput.onclick = function () {
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      hasContent.set(true)
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    }
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    var publishBtn = h('button', {
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      'ev-click': publish,
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      disabled: publishing
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    }, when(publishing, 'Publishing...', 'Publish'))
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    var actions = h('section.actions', [
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      fileInput,
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      publishBtn
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    ])
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    var composer = h('Compose', {
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      classList: [
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        when(expanded, '-expanded', '-contracted')
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      ]
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    }, [
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      textArea,
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      warning,
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      actions
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    ])
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    addSuggest(textArea, (inputText, cb) => {
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      if (inputText[0] === '@') {
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        cb(null, getProfileSuggestions(inputText.slice(1)))
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      } else if (inputText[0] === '#') {
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        cb(null, getChannelSuggestions(inputText.slice(1)))
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      } else if (inputText[0] === ':') {
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        // suggest emojis
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        var word = inputText.slice(1)
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        if (word[word.length - 1] === ':') {
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          word = word.slice(0, -1)
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        }
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        // TODO: when no emoji typed, list some default ones
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        cb(null, api.emoji.sync.names().filter(function (name) {
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          return name.slice(0, word.length) === word
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        }).slice(0, 100).map(function (emoji) {
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          return {
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            image: api.emoji.sync.url(emoji),
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            title: emoji,
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            subtitle: emoji,
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            value: ':' + emoji + ':'
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          }
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        }))
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      }
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    }, {cls: 'SuggestBox'})
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    return composer
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    // scoped
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    function publish () {
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      publishing.set(true)
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      var content = extend(resolve(meta), {
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        text: textArea.value,
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        mentions: mentions(textArea.value).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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      })
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      try {
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        if (typeof prepublish === 'function') {
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          content = prepublish(content)
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        }
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      } catch (err) {
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        publishing.set(false)
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        if (cb) cb(err)
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        else throw err
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      }
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      return api.message.async.publish(content, done)
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      function done (err, msg) {
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        publishing.set(false)
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        if (err) throw err
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        else if (msg) textArea.value = ''
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        if (cb) cb(err, msg)
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      }
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    }
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  })
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}
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