git ssb

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const { h, when, send, resolve, Value, computed } = require('mutant')
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const nest = require('depnest')
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const ssbMentions = require('ssb-mentions')
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const extend = require('xtend')
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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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  'channel.async.suggest': 'first',
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  'emoji.async.suggest': 'first',
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  'blob.html.input': 'first',
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  'message.html.confirm': 'first',
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  'drafts.sync.get': 'first',
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  'drafts.sync.set': 'first',
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  'drafts.sync.remove': '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 ({ meta, location, prepublish, placeholder = 'Write a message', shrink = true }, cb) {
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    if (typeof resolve(meta) !== 'object') throw new Error('Compose needs meta data about what sort of message composer you are making')
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    if (!location) throw new Error('Compose expects a unique location so it can save drafts of messages')
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    var files = []
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    var filesById = {}
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    var channelInputFocused = Value(false)
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    var textAreaFocused = Value(false)
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    var focused = computed([channelInputFocused, textAreaFocused], (a, b) => a || b)
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    var hasContent = Value(false)
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    var getProfileSuggestions = api.about.async.suggest()
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    var getChannelSuggestions = api.channel.async.suggest()
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    var getEmojiSuggestions = api.emoji.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) return true
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      return focused
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    })
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    var channelInput = h('input.channel', {
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      'ev-input': () => hasContent.set(!!channelInput.value),
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      'ev-keyup': ev => {
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        ev.target.value = ev.target.value.replace(/^#*([\w@%&])/, '#$1')
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      },
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      'ev-blur': () => {
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        clearTimeout(blurTimeout)
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        blurTimeout = setTimeout(() => channelInputFocused.set(false), 200)
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      },
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      'ev-focus': send(channelInputFocused.set, true),
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      placeholder: '#channel (optional)',
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      value: computed(meta.channel, ch => ch ? '#' + ch : null),
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      disabled: when(meta.channel, true),
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      title: when(meta.channel, 'Reply is in same channel as original message')
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    })
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    var draftPerstTimeout = null
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    var draftLocation = location
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    var textArea = h('textarea', {
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      'ev-input': () => {
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        hasContent.set(!!textArea.value)
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        clearTimeout(draftPerstTimeout)
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        draftPerstTimeout = setTimeout(() => {
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          api.drafts.sync.set(draftLocation, textArea.value)
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        }, 200)
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      },
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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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    textArea.publish = publish // TODO: fix - clunky api for the keyboard shortcut to target
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    // load draft
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    let draft = api.drafts.sync.get(draftLocation)
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    if (typeof draft === 'string') {
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      textArea.value = draft
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      hasContent.set(true)
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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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      const pos = textArea.selectionStart
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      const embed = file.type.match(/^image/) ? '!' : ''
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      const spacer = embed ? '\n' : ' '
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      const insertLink = spacer + embed + '[' + file.name + ']' + '(' + file.link + ')' + spacer
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      textArea.value = textArea.value.slice(0, pos) + insertLink + textArea.value.slice(pos)
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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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    var publishBtn = h('button', { 'ev-click': publish }, '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: when(expanded, '-expanded', '-contracted')
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    }, [
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      channelInput,
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      textArea,
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      warning,
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      actions
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    ])
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    addSuggest(channelInput, (inputText, cb) => {
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      if (inputText[0] === '#') {
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        cb(null, getChannelSuggestions(inputText.slice(1)))
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      }
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    }, {cls: 'PatchSuggest'})
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    channelInput.addEventListener('suggestselect', ev => {
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      channelInput.value = ev.detail.id  // HACK : this over-rides the markdown value
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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, getProfileSuggestions(wordFragment))
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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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      publishBtn.disabled = true
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      const channel = channelInput.value.startsWith('#')
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        ? channelInput.value.substr(1).trim()
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        : channelInput.value.trim()
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      const mentions = ssbMentions(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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      var content = extend(resolve(meta), {
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        text: textArea.value,
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        channel,
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        mentions
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      })
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      if (!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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      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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        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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      return api.message.html.confirm(content, done)
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      function done (err, msg) {
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        publishBtn.disabled = false
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        if (err) throw err
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        else if (msg) {
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          textArea.value = ''
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          api.drafts.sync.remove(draftLocation)
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        }
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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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