webogram-i2p/app/js/message_composer.js

/*!
 * Webogram v0.5.5 - messaging web application for MTProto
 * https://github.com/zhukov/webogram
 * Copyright (C) 2014 Igor Zhukov <igor.beatle@gmail.com>
 * https://github.com/zhukov/webogram/blob/master/LICENSE
 */

'use strict'

/* EmojiHelper */

;(function (global, emojis, categories, spritesheets) {
  var emojis = {}
  var shortcuts = {}
  var spritesheetPositions = {}
  var index = false

  var popular = 'joy,kissing_heart,heart,heart_eyes,blush,grin,+1,relaxed,pensive,smile,sob,kiss,unamused,flushed,stuck_out_tongue_winking_eye,see_no_evil,wink,smiley,cry,stuck_out_tongue_closed_eyes,scream,rage,smirk,disappointed,sweat_smile,kissing_closed_eyes,speak_no_evil,relieved,grinning,yum,laughing,ok_hand,neutral_face,confused'.split(',')

  var i
  var j
  var code
  var shortcut
  var emoji
  var row
  var column
  var totalColumns
  var len1
  var len2

  for (i = 0, len1 = categories.length; i < len1; i++) {
    totalColumns = spritesheets[i][1]
    for (j = 0, len2 = categories[i].length; j < len2; j++) {
      code = categories[i][j]
      emoji = Config.Emoji[code]
      shortcut = emoji[1][0]
      emojis[code] = [emoji[0], shortcut]
      shortcuts[shortcut] = code
      spritesheetPositions[code] = [i, j, Math.floor(j / totalColumns), j % totalColumns]
    }
  }

  function getPopularEmoji (callback) {
    ConfigStorage.get('emojis_popular', function (popEmojis) {
      var result = []
      if (popEmojis && popEmojis.length) {
        for (var i = 0, len = popEmojis.length; i < len; i++) {
          result.push({code: popEmojis[i][0], rate: popEmojis[i][1]})
        }
        callback(result)
        return
      }
      ConfigStorage.get('emojis_recent', function (recentEmojis) {
        recentEmojis = recentEmojis || popular || []
        var shortcut
        var code
        for (var i = 0, len = recentEmojis.length; i < len; i++) {
          shortcut = recentEmojis[i]
          if (Array.isArray(shortcut)) {
            shortcut = shortcut[0]
          }
          if (shortcut && typeof shortcut === 'string') {
            if (shortcut.charAt(0) == ':') {
              shortcut = shortcut.substr(1, shortcut.length - 2)
            }
            if (code = shortcuts[shortcut]) {
              result.push({code: code, rate: 1})
            }
          }
        }
        callback(result)
      })
    })
  }

  function pushPopularEmoji (code) {
    getPopularEmoji(function (popularEmoji) {
      var exists = false
      var count = popularEmoji.length
      var result = []
      for (var i = 0; i < count; i++) {
        if (popularEmoji[i].code == code) {
          exists = true
          popularEmoji[i].rate++
        }
        result.push([popularEmoji[i].code, popularEmoji[i].rate])
      }
      if (exists) {
        result.sort(function (a, b) {
          return b[1] - a[1]
        })
      } else {
        if (result.length > 41) {
          result = result.slice(0, 41)
        }
        result.push([code, 1])
      }
      ConfigStorage.set({emojis_popular: result})
    })
  }

  function indexEmojis () {
    if (index === false) {
      index = SearchIndexManager.createIndex()
      var shortcut
      for (shortcut in shortcuts) {
        if (shortcuts.hasOwnProperty(shortcut)) {
          SearchIndexManager.indexObject(shortcuts[shortcut], shortcut, index)
        }
      }
    }
  }

  function searchEmojis (q) {
    indexEmojis()
    var foundObject = SearchIndexManager.search(q, index)
    var foundCodes = []
    var code
    for (code in foundObject) {
      if (foundObject.hasOwnProperty(code)) {
        foundCodes.push(code)
      }
    }
    return foundCodes
  }

  global.EmojiHelper = {
    emojis: emojis,
    shortcuts: shortcuts,
    spritesheetPositions: spritesheetPositions,
    getPopularEmoji: getPopularEmoji,
    pushPopularEmoji: pushPopularEmoji,
    indexEmojis: indexEmojis,
    searchEmojis: searchEmojis
  }
})(window, Config.Emoji, Config.EmojiCategories, Config.EmojiCategorySpritesheetDimens)

function EmojiTooltip (btnEl, options) {
  options = options || {}
  var self = this

  this.btnEl = $(btnEl)
  this.onEmojiSelected = options.onEmojiSelected
  this.onStickerSelected = options.onStickerSelected
  this.getStickers = options.getStickers
  this.getStickerImage = options.getStickerImage
  this.onStickersetSelected = options.onStickersetSelected
  this.langpack = options.langpack || {}

  if (!Config.Navigator.touch) {
    $(this.btnEl).on('mouseenter mouseleave', function (e) {
      self.isOverBtn = e.type == 'mouseenter'
      self.createTooltip()

      if (self.isOverBtn) {
        self.onMouseEnter(true)
      } else {
        self.onMouseLeave(true)
      }
    })
  }
  $(this.btnEl).on('mousedown', function (e) {
    if (!self.shown) {
      clearTimeout(self.showTimeout)
      delete self.showTimeout
      self.createTooltip()
      self.show()
    } else {
      clearTimeout(self.hideTimeout)
      delete self.hideTimeout
      self.hide()
    }
    return cancelEvent(e)
  })
  $(document).on('mousedown', function (e) {
    if (self.shown) {
      self.hide()
    }
  })
}

EmojiTooltip.prototype.onMouseEnter = function (triggerShow) {
  if (this.hideTimeout) {
    clearTimeout(this.hideTimeout)
    delete this.hideTimeout
  }
  else if (triggerShow && !this.showTimeout) {
    this.showTimeout = setTimeout(this.show.bind(this), 100)
  }
}

EmojiTooltip.prototype.onMouseLeave = function (triggerUnshow) {
  if (!this.hideTimeout) {
    var self = this
    this.hideTimeout = setTimeout(function () {
      self.hide()
    }, 600)
  }
  else if (triggerUnshow && this.showTimeout) {
    clearTimeout(this.showTimeout)
    delete this.showTimeout
  }
}

EmojiTooltip.prototype.createTooltip = function () {
  if (this.tooltipEl) {
    return false
  }

  var html =
  '<div class="composer_emoji_tooltip noselect">\
  <div class="composer_emoji_tooltip_tabs">\
    <div class="composer_emoji_tooltip_tab composer_emoji_tooltip_tab_emoji">' + this.langpack.im_emoji_tab + '</div>\
    <div class="composer_emoji_tooltip_tab composer_emoji_tooltip_tab_stickers">' + this.langpack.im_stickers_tab + '</div>\
    <div class="composer_emoji_tooltip_tab_shadow"></div>\
  </div>\
  <div class="composer_emoji_tooltip_tabs_wrap">\
    <div class="composer_emoji_tooltip_tabs_contents clearfix">\
      <div class="composer_emoji_tooltip_tab_emoji_content">\
        <div class="composer_emoji_tooltip_content_wrap">\
          <div class="composer_emoji_tooltip_content composer_emoji_tooltip_content_emoji clearfix"></div>\
        </div>\
        <div class="composer_emoji_tooltip_categories">\
          <a class="composer_emoji_tooltip_category active" data-category="0"><i class="composer_emoji_tooltip_category_recent"></i></a>\
          <a class="composer_emoji_tooltip_category" data-category="1"><i class="composer_emoji_tooltip_category_smile"></i></a>\
          <a class="composer_emoji_tooltip_category" data-category="2"><i class="composer_emoji_tooltip_category_flower"></i></a>\
          <a class="composer_emoji_tooltip_category" data-category="3"><i class="composer_emoji_tooltip_category_bell"></i></a>\
          <a class="composer_emoji_tooltip_category" data-category="4"><i class="composer_emoji_tooltip_category_car"></i></a>\
          <a class="composer_emoji_tooltip_category" data-category="5"><i class="composer_emoji_tooltip_category_grid"></i></a>\
        </div>\
      </div>\
      <div class="composer_emoji_tooltip_tab_stickers_content">\
        <div class="composer_emoji_tooltip_content_wrap">\
            <div class="composer_emoji_tooltip_content composer_emoji_tooltip_content_stickers clearfix"></div>\
          </div>\
          <div class="composer_emoji_tooltip_categories"></div>\
      </div>\
    </div>\
  </div>\
  <div class="composer_emoji_tooltip_tail"><i class="icon icon-tooltip-tail"></i></div>\
</div>'

  html = html.replace(/>\s+</g, '><')

  var self = this
  this.tooltipEl = $(html).appendTo(document.body)

  this.tabsEl = $('.composer_emoji_tooltip_tabs', this.tooltipEl)
  this.categoriesEl = $('.composer_emoji_tooltip_categories', this.tooltipEl)
  this.stickersCategoriesEl = $('.composer_emoji_tooltip_tab_stickers_content .composer_emoji_tooltip_categories', this.tooltipEl)

  this.contentEl = $('.composer_emoji_tooltip_content', this.tooltipEl)
  this.emojiContentEl = $('.composer_emoji_tooltip_content_emoji', this.tooltipEl)
  this.stickersContentEl = $('.composer_emoji_tooltip_content_stickers', this.tooltipEl)

  // Tabs
  angular.forEach(['emoji', 'stickers'], function (tabName, tabIndex) {
    var tab = $('.composer_emoji_tooltip_tab_' + tabName, self.tabsEl)
      .on('mousedown', function (e) {
        self.selectTab(tabIndex)
        return cancelEvent(e)
      })

    if (!Config.Navigator.touch) {
      tab.on('mouseenter mouseleave', function (e) {
        clearTimeout(self.selectTabTimeout)
        if (e.type == 'mouseenter') {
          self.selectTabTimeout = setTimeout(function () {
            self.selectTab(tabIndex)
          }, 300)
        }
      })
    }
  })

  // Categories
  var handleEvents = 'mousedown'
  if (!Config.Navigator.touch) {
    handleEvents += ' mouseover mouseout'
  }
  this.categoriesEl.on(handleEvents, function (e) {
    e = e.originalEvent || e
    var target = e.target
    if (target.tagName != 'A') {
      target = target.parentNode
    }
    if (target.tagName != 'A') {
      return
    }
    var catIndex = parseInt(target.getAttribute('data-category'))
    if (e.type == 'mousedown') {
      self.selectCategory(catIndex)
      return cancelEvent(e)
    }
    if (self.tab) {
      return
    }
    var isOver = e.type == 'mouseover'
    if (isOver && self.selectCategoryIndex == catIndex) {
      return
    }
    clearTimeout(self.selectCategoryTimeout)
    delete self.selectCategoryTimeout
    if (isOver) {
      self.selectCategoryIndex = catIndex
      self.selectCategoryTimeout = setTimeout(function () {
        delete self.selectCategoryIndex
        delete self.selectCategoryTimeout
        self.selectCategory(catIndex)
      }, 300)
    } else {
      delete self.selectCategoryIndex
    }
  })

  this.emojiScroller = new Scroller(this.emojiContentEl, {classPrefix: 'composer_emoji_tooltip'})
  this.stickersScroller = new Scroller(this.stickersContentEl, {classPrefix: 'composer_emoji_tooltip'})
  this.stickersScroller.onScroll(function (el, st) {
    self.onStickersScroll(el, st)
  })

  this.contentEl.on('mousedown', function (e) {
    e = e.originalEvent || e
    var target = $(e.target), code, sticker, stickerset
    if (target[0].tagName != 'A') {
      target = $(target[0].parentNode)
    }
    if (code = target.attr('data-code')) {
      if (self.onEmojiSelected) {
        self.onEmojiSelected(code)
      }
      EmojiHelper.pushPopularEmoji(code)
    }
    if (sticker = target.attr('data-sticker')) {
      if (self.onStickerSelected) {
        self.onStickerSelected(sticker)
      }
      if (Config.Mobile) {
        self.hide()
      }
    }
    if (stickerset = target.attr('data-stickerset')) {
      if (self.onStickersetSelected) {
        self.onStickersetSelected(stickerset)
      }
      self.hide()
    }
    return cancelEvent(e)
  })

  if (!Config.Navigator.touch) {
    this.tooltipEl.on('mouseenter mouseleave', function (e) {
      if (e.type == 'mouseenter') {
        self.onMouseEnter()
      } else {
        self.onMouseLeave()
      }
    })
  }

  this.selectTab(0)

  $(window).on('resize', this.updatePosition.bind(this))

  return true
}

EmojiTooltip.prototype.selectCategory = function (cat, force) {
  if (!this.tab && this.cat === cat && !force) {
    return false
  }
  $('.active', this.categoriesEl).removeClass('active')
  this.cat = cat

  if (this.tab) {
    this.activateStickerCategory()
    this.updateStickersContents(force)
  } else {
    $(this.categoriesEl[this.tab].childNodes[cat]).addClass('active')
    this.updateEmojiContents()
  }
}

EmojiTooltip.prototype.selectTab = function (tab, force) {
  if (this.tab === tab && !force) {
    return false
  }

  this.tab = tab
  this.selectCategory(0, true)

  var self = this
  setTimeout(function () {
    $(self.tooltipEl).toggleClass('composer_emoji_tooltip_tabs_stickers_active', tab == 1)
  }, 0)
}

EmojiTooltip.prototype.updateEmojiContents = function () {
  var html = []
  var self = this
  var iconSize = 26

  var renderContent = function () {
    self.emojiContentEl.html(html.join(''))
    self.emojiScroller.reinit()
  }

  if (this.cat > 0) {
    var categoryIndex = this.cat - 1
    var emoticonCodes = Config.EmojiCategories[categoryIndex]
    var totalColumns = Config.EmojiCategorySpritesheetDimens[categoryIndex][1]
    var count = emoticonCodes.length
    var emoticonCode
    var emoticonData
    var i
    var x
    var y

    for (i = 0; i < count; i++) {
      emoticonCode = emoticonCodes[i]
      emoticonData = Config.Emoji[emoticonCode]
      x = iconSize * (i % totalColumns)
      y = iconSize * Math.floor(i / totalColumns)
      html.push('<a class="composer_emoji_btn" title=":' + encodeEntities(emoticonData[1][0]) + ':" data-code="' + encodeEntities(emoticonCode) + '"><i class="emoji emoji-w' + iconSize + ' emoji-spritesheet-' + categoryIndex + '" style="background-position: -' + x + 'px -' + y + 'px;"></i></a>')
    }
    renderContent()
  }else {
    EmojiHelper.getPopularEmoji(function (popularEmoji) {
      var emoticonCode
      var emoticonData
      var spritesheet
      var pos
      var categoryIndex
      var count = popularEmoji.length
      var i
      var x
      var y

      for (i = 0; i < count; i++) {
        emoticonCode = popularEmoji[i].code
        if (emoticonData = Config.Emoji[emoticonCode]) {
          spritesheet = EmojiHelper.spritesheetPositions[emoticonCode]
          categoryIndex = spritesheet[0]
          pos = spritesheet[1]
          x = iconSize * spritesheet[3]
          y = iconSize * spritesheet[2]
          html.push('<a class="composer_emoji_btn" title=":' + encodeEntities(emoticonData[1][0]) + ':" data-code="' + encodeEntities(emoticonCode) + '"><i class="emoji emoji-w' + iconSize + ' emoji-spritesheet-' + categoryIndex + '" style="background-position: -' + x + 'px -' + y + 'px;"></i></a>')
        }
      }
      renderContent()
    })
  }
}

EmojiTooltip.prototype.updateStickersContents = function (force) {
  var html = []
  var categoriesHtml = []
  var self = this
  var iconSize = 26

  var scrollStickers = function () {
    var scrollTop = self.cat ? self.stickersetPositions[self.cat][0] : 0
    self.stickersScroller.scrollTo(scrollTop, force ? 0 : 200)
  }

  if (!force && self.stickersetPositions.length) {
    scrollStickers()
    return
  }

  var renderStickers = function (stickersets) {
    var set
    var docID
    var i
    var j
    var len1
    var len2
    for (i = 0, len1 = stickersets.length; i < len1; i++) {
      set = stickersets[i]
      if (!set.docIDs.length) {
        continue
      }
      html.push('<div class="composer_stickerset_wrap clearfix">')
      if (set.title) {
        html.push(
          '<a class="composer_stickerset_title',
          set.id ? '' : ' disabled',
          '" data-stickerset="',
          encodeEntities(set.short_name),
          '">',
          encodeEntities(set.title),
          '</a>'
        )
      }
      if (!set.id) {
        categoriesHtml.push('<a class="composer_emoji_tooltip_category active" data-category="0"><i class="composer_emoji_tooltip_category_recent"></i></a>')
      } else {
        categoriesHtml.push('<a class="composer_sticker_btn" data-sticker="' + set.docIDs[0] + '" data-category="' + i + '"></a>')
      }
      for (j = 0, len2 = set.docIDs.length; j < len2; j++) {
        docID = set.docIDs[j]
        html.push('<a class="composer_sticker_btn" data-sticker="' + docID + '"></a>')
      }
      html.push('</div>')
    }

    self.stickersContentEl.html(html.join(''))
    self.stickersCategoriesEl.html(categoriesHtml.join(''))
    self.stickersScroller.reinit()

    var scrollPositions = []
    $('.composer_stickerset_wrap', self.stickersContentEl).each(function (k, stickerSetEl) {
      var height = stickerSetEl.offsetHeight
      var top = stickerSetEl.offsetTop
      scrollPositions.push([top, height])
    })
    self.stickersetPositions = scrollPositions
    scrollStickers()

    var preload = []
    self.contentEl.find('.composer_sticker_btn').each(function (k, element) {
      if (k < 12) {
        self.replaceStickerImage(element)
      } else {
        preload.push([element.offsetTop, element])
      }
    })
    self.stickersPreload = preload

    self.stickersCategoriesEl.find('.composer_sticker_btn').each(function (k, element) {
      self.replaceStickerImage(element)
    })
  }
  this.getStickers(renderStickers)
}

EmojiTooltip.prototype.replaceStickerImage = function (element) {
  element = $(element)
  this.getStickerImage(element, element.attr('data-sticker'))
}

EmojiTooltip.prototype.onStickersScroll = function (scrollable, scrollTop) {
  var ch = scrollable.clientHeight
  var sh = scrollable.scrollHeight
  var len = this.stickersetPositions.length
  var currentCat = false
  var currentPos
  var i

  if (scrollTop < 20) {
    currentCat = 0
  } else if (scrollTop > sh - ch - 20) {
    currentCat = len - 1
  } else {
    for (i = 0; i < len; i++) {
      currentPos = this.stickersetPositions[i]
      if (scrollTop >= currentPos[0] &&
        scrollTop < (currentPos[0] + currentPos[1])) {
        currentCat = i
        break
      }
    }
  }
  var len = this.stickersPreload.length
  if (len) {
    for (i = 0; i < len; i++) {
      currentPos = this.stickersPreload[i]
      if (currentPos[0] >= scrollTop && currentPos[0] <= scrollTop + ch) {
        // console.log('replace', currentPos[1], i)
        this.replaceStickerImage(currentPos[1])
        this.stickersPreload.splice(i, 1)
        i--
        len--
      }
    }
  }
  // console.log('on sticker scroll', scrollTop, ch, sh, currentCat, this.stickersetPositions)
  if (this.cat === currentCat || currentCat === false) {
    return
  }
  $('.active', this.categoriesEl).removeClass('active')
  this.cat = currentCat
  this.activateStickerCategory()
}

EmojiTooltip.prototype.onStickersChanged = function () {
  if (this.tab) {
    this.updateStickersContents(true)
  }
}

EmojiTooltip.prototype.activateStickerCategory = function () {
  var categoriesEl = this.categoriesEl[1]
  var categoryEl = categoriesEl.childNodes[this.cat]
  if (!categoryEl) {
    return
  }
  $(categoryEl).addClass('active')

  var left = categoryEl.offsetLeft
  var width = categoryEl.offsetWidth
  var viewportWidth = categoriesEl.clientWidth

  // console.log('current cat el', categoryEl, left, width, viewportWidth)
  $(categoriesEl).stop(true).animate({scrollLeft: left - (viewportWidth - width) / 2}, 200)
}

EmojiTooltip.prototype.updatePosition = function () {
  var offset = this.btnEl.offset()
  this.tooltipEl.css({top: offset.top, left: offset.left})
}

EmojiTooltip.prototype.show = function () {
  this.updatePosition()
  if (this.tab) {
    this.updateStickersContents(true)
  } else {
    this.updateEmojiContents()
  }
  this.tooltipEl.addClass('composer_emoji_tooltip_shown')
  this.btnEl.addClass('composer_emoji_insert_btn_on')
  delete this.showTimeout
  this.shown = true
}

EmojiTooltip.prototype.hide = function () {
  if (this.tooltipEl) {
    this.tooltipEl.removeClass('composer_emoji_tooltip_shown')
    this.btnEl.removeClass('composer_emoji_insert_btn_on')
  }
  delete this.hideTimeout
  delete this.shown
}

function EmojiPanel (containerEl, options) {
  options = options || {}
  var self = this

  this.containerEl = $(containerEl)
  this.onEmojiSelected = options.onEmojiSelected

  this.containerEl.on('mousedown', function (e) {
    e = e.originalEvent || e
    var target = $(e.target), code
    if (target[0].tagName != 'A') {
      target = $(target[0].parentNode)
    }
    if (code = target.attr('data-code')) {
      if (self.onEmojiSelected) {
        self.onEmojiSelected(code)
      }
      EmojiHelper.pushPopularEmoji(code)
    }
    return cancelEvent(e)
  })

  this.update()
}

EmojiPanel.prototype.update = function () {
  var html = []
  var self = this
  var iconSize = Config.Mobile ? 26 : 20

  EmojiHelper.getPopularEmoji(function (popularEmoji) {
    var emoticonCode
    var emoticonData
    var spritesheet
    var pos
    var categoryIndex
    var count = popularEmoji.length
    var i
    var x
    var y

    for (i = 0; i < count; i++) {
      emoticonCode = popularEmoji[i].code
      if (emoticonData = Config.Emoji[emoticonCode]) {
        spritesheet = EmojiHelper.spritesheetPositions[emoticonCode]
        categoryIndex = spritesheet[0]
        pos = spritesheet[1]
        x = iconSize * spritesheet[3]
        y = iconSize * spritesheet[2]
        html.push('<a class="composer_emoji_btn" title=":' + encodeEntities(emoticonData[1][0]) + ':" data-code="' + encodeEntities(emoticonCode) + '"><i class="emoji emoji-w20 emoji-spritesheet-' + categoryIndex + '" style="background-position: -' + x + 'px -' + y + 'px;"></i></a>')
      }
    }
    self.containerEl.html(html.join(''))
  })
}

function MessageComposer (textarea, options) {
  var self = this

  this.textareaEl = $(textarea)

  this.setUpInput()

  this.autoCompleteWrapEl = $('<div class="composer_dropdown_wrap"></div>').appendTo(document.body)
  var autoCompleteEl = $('<div></div>').appendTo(this.autoCompleteWrapEl)

  options.dropdownDirective(autoCompleteEl, function (scope, newAutoCompleteEl) {
    self.autoCompleteEl = newAutoCompleteEl
    self.autoCompleteScope = scope
    self.setUpAutoComplete()
  })

  this.isActive = false

  this.onTyping = options.onTyping
  this.onMessageSubmit = options.onMessageSubmit
  this.getSendOnEnter = options.getSendOnEnter
  this.onFilePaste = options.onFilePaste
  this.onCommandSend = options.onCommandSend
  this.onInlineResultSend = options.onInlineResultSend
  this.mentions = options.mentions
  this.commands = options.commands
}

MessageComposer.autoCompleteRegEx = /(\s|^)(:|@|\/)([\S]*)$/

MessageComposer.prototype.setUpInput = function () {
  this.inlinePlaceholderWrap = $('<div class="im_inline_placeholder_wrap"></div>').prependTo(this.textareaEl[0].parentNode)
  this.inlinePlaceholderPrefixEl = $('<span class="im_inline_placeholder_prefix"></span>').appendTo(this.inlinePlaceholderWrap)
  this.inlinePlaceholderEl = $('<span class="im_inline_placeholder"></span>').appendTo(this.inlinePlaceholderWrap)

  if ('contentEditable' in document.body) {
    this.setUpRich()
  } else {
    this.setUpPlaintext()
  }

  if (!Config.Mobile) {
    var sbWidth = getScrollWidth()
    if (sbWidth) {
      (this.richTextareaEl || this.textareaEl).css({marginRight: -sbWidth})
    }
  }
}

MessageComposer.prototype.setInlinePlaceholder = function (prefix, placeholder) {
  this.inlinePlaceholderPrefix = prefix
  this.inlinePlaceholderPrefixEl.html(encodeEntities(prefix))
  this.inlinePlaceholderEl.html(encodeEntities(placeholder))
  this.onChange()
}

MessageComposer.prototype.updateInlinePlaceholder = function () {
  var prefix = this.inlinePlaceholderPrefix
  if (prefix) {
    var value = this.textareaEl.val()
    this.inlinePlaceholderWrap.toggleClass('active', value == prefix)
  }
}

MessageComposer.prototype.setUpAutoComplete = function () {
  this.scroller = new Scroller(this.autoCompleteEl, {maxHeight: 180})

  var self = this
  this.autoCompleteEl.on('mousedown', function (e) {
    e = e.originalEvent || e
    var target = e.target
    var mention
    var code
    var command
    var inlineID
    while (target && target.tagName != 'A') {
      target = target.parentNode
    }
    if (!target) {
      return cancelEvent(e)
    }
    target = $(target)
    if (code = target.attr('data-code')) {
      if (self.onEmojiSelected) {
        self.onEmojiSelected(code, true)
      }
      EmojiHelper.pushPopularEmoji(code)
    }
    if (mention = target.attr('data-mention')) {
      self.onMentionSelected(mention, target.attr('data-name'))
    }
    if (command = target.attr('data-command')) {
      if (self.onCommandSelected) {
        self.onCommandSelected(command)
      }
      self.hideSuggestions()
    }
    if (inlineID = target.attr('data-inlineid')) {
      if (self.onInlineResultSend) {
        self.onInlineResultSend(inlineID)
      }
      self.hideSuggestions()
    }
    return cancelEvent(e)
  })
}

MessageComposer.prototype.setUpRich = function () {
  this.textareaEl.hide()
  this.richTextareaEl = $('<div class="composer_rich_textarea" contenteditable="true" dir="auto"></div>')

  this.textareaEl[0].parentNode.insertBefore(this.richTextareaEl[0], this.textareaEl[0])

  this.richTextareaEl.on('keyup keydown', this.onKeyEvent.bind(this))
  this.richTextareaEl.on('focus blur', this.onFocusBlur.bind(this))
  this.richTextareaEl.on('paste', this.onRichPaste.bind(this))
  this.richTextareaEl.on('DOMNodeInserted', this.onRichPasteNode.bind(this))

  $(document.body).on('keydown', this.backupSelection.bind(this))
}

MessageComposer.prototype.setUpPlaintext = function () {
  this.textareaEl.on('keyup keydown', this.onKeyEvent.bind(this))
  this.textareaEl.on('focus blur', this.onFocusBlur.bind(this))
}

MessageComposer.prototype.onKeyEvent = function (e) {
  var self = this
  if (e.type == 'keyup') {
    // console.log(dT(), 'keyup', e.keyCode)
    this.checkAutocomplete()

    var length = false
    if (this.richTextareaEl) {
      clearTimeout(this.updateValueTO)
      var now = tsNow()
      if (this.keyupStarted === undefined) {
        this.keyupStarted = now
      }
      if (now - this.keyupStarted > 3000 || true) {
        this.onChange()
      }else {
        length = this.richTextareaEl[0].textContent.length
        if (this.wasEmpty != !length) {
          this.wasEmpty = !this.wasEmpty
          this.onChange()
        } else if (this.inlinePlaceholderPrefix) {
          this.onChange()
        } else {
          this.updateValueTO = setTimeout(this.onChange.bind(this), 1000)
        }
      }
    }

    if (this.onTyping) {
      var now = tsNow()
      if (now - this.lastTyping > 5000) {
        if (length === false) {
          length = (this.richTextareaEl ? this.richTextareaEl[0].textContent : this.textareaEl[0].value).length
        }

        if (length != this.lastLength) {
          this.lastTyping = now
          this.lastLength = length
          this.onTyping()
        }
      }
    }
  }
  if (e.type == 'keydown') {
    var checkSubmit = !this.autocompleteShown
    if (this.autocompleteShown) {
      if (e.keyCode == 38 || e.keyCode == 40) { // UP / DOWN
        var next = e.keyCode == 40
        var currentSel = $(this.autoCompleteEl).find('li.composer_autocomplete_option_active')
        var allLIs = Array.prototype.slice.call($(this.autoCompleteEl).find('li'))
        var nextSel

        if (currentSel.length) {
          var pos = allLIs.indexOf(currentSel[0])
          var nextPos = pos + (next ? 1 : -1)
          nextSel = allLIs[nextPos]
          currentSel.removeClass('composer_autocomplete_option_active')
          if (nextSel) {
            $(nextSel).addClass('composer_autocomplete_option_active')
            this.scroller.scrollToNode(nextSel)
            // console.log(dT(), 'keydown cancel', e.keyCode)
            return cancelEvent(e)
          }
        }

        nextSel = allLIs[next ? 0 : allLIs.length - 1]
        this.scroller.scrollToNode(nextSel)
        $(nextSel).addClass('composer_autocomplete_option_active')

        // console.log(dT(), 'keydown cancel', e.keyCode)
        return cancelEvent(e)
      }

      if (e.keyCode == 13 || e.keyCode == 9) { // Enter or Tab
        var currentSel = $(this.autoCompleteEl).find('li.composer_autocomplete_option_active')
        if (!currentSel.length && e.keyCode == 9) {
          currentSel = $(this.autoCompleteEl).find('li:first')
        }
        currentSel = currentSel.find('a:first')
        var code
        var mention
        var command
        var inlineID
        if (code = currentSel.attr('data-code')) {
          this.onEmojiSelected(code, true)
          EmojiHelper.pushPopularEmoji(code)
          return cancelEvent(e)
        }
        if (mention = currentSel.attr('data-mention')) {
          this.onMentionSelected(mention, currentSel.attr('data-name'))
          return cancelEvent(e)
        }
        if (command = currentSel.attr('data-command')) {
          if (this.onCommandSelected) {
            this.onCommandSelected(command, e.keyCode == 9)
          }
          return cancelEvent(e)
        }
        if (inlineID = currentSel.attr('data-inlineid')) {
          if (self.onInlineResultSend) {
            self.onInlineResultSend(inlineID)
          }
          self.hideSuggestions()
          // console.log(dT(), 'keydown cancel', e.keyCode)
          return cancelEvent(e)
        }
        checkSubmit = true
      }
    }

    if (checkSubmit && e.keyCode == 13) {
      var submit = false
      var sendOnEnter = true
      if (this.getSendOnEnter && !this.getSendOnEnter()) {
        sendOnEnter = false
      }
      if (sendOnEnter && !e.shiftKey) {
        submit = true
      } else if (!sendOnEnter && (e.ctrlKey || e.metaKey)) {
        submit = true
      }

      if (submit) {
        this.onMessageSubmit(e)
        return cancelEvent(e)
      }
    }
  }
}

MessageComposer.prototype.backupSelection = function () {
  delete this.selection

  if (!this.isActive) {
    return
  }
  if (window.getSelection) {
    var sel = window.getSelection()
    if (sel.getRangeAt && sel.rangeCount) {
      this.selection = sel.getRangeAt(0)
    }
  } else if (document.selection && document.selection.createRange) {
    this.selection = document.selection.createRange()
  }
}

MessageComposer.prototype.restoreSelection = function () {
  if (!this.selection) {
    return false
  }
  var result = false
  if (window.getSelection) {
    var sel = window.getSelection()
    sel.removeAllRanges()
    sel.addRange(this.selection)
    result = true
  }
  else if (document.selection && this.selection.select) {
    this.selection.select()
    result = true
  }
  delete this.selection

  return result
}

MessageComposer.prototype.checkAutocomplete = function (forceFull) {
  var pos
  var value
  if (this.richTextareaEl) {
    var textarea = this.richTextareaEl[0]
    var valueCaret = getRichValueWithCaret(textarea)
    var value = valueCaret[0]
    var pos = valueCaret[1] >= 0 ? valueCaret[1] : value.length

    if (!pos) {
      this.cleanRichTextarea(value, true)
    }
  } else {
    var textarea = this.textareaEl[0]
    var pos = getFieldSelection(textarea)
    var value = textarea.value
  }

  if (value &&
    this.curInlineResults &&
    this.curInlineResults.text == value) {
    this.showInlineSuggestions(this.curInlineResults)
    return
  }

  if (!forceFull) {
    value = value.substr(0, pos)
  }

  var matches = value.match(MessageComposer.autoCompleteRegEx)
  if (matches) {
    if (this.previousQuery == matches[0]) {
      return
    }
    this.previousQuery = matches[0]
    var query = SearchIndexManager.cleanSearchText(matches[3])

    if (matches[2] == '@') { // mentions
      if (this.mentions && this.mentions.index) {
        if (query.length) {
          var foundObject = SearchIndexManager.search(query, this.mentions.index)
          var foundUsers = []
          var user
          for (var i = 0, length = this.mentions.users.length; i < length; i++) {
            user = this.mentions.users[i]
            if (foundObject[user.id]) {
              foundUsers.push(user)
            }
          }
        } else {
          var foundUsers = this.mentions.users
        }
        if (foundUsers.length) {
          this.showMentionSuggestions(foundUsers)
        } else {
          this.hideSuggestions()
        }
      } else {
        this.hideSuggestions()
      }
    }
    else if (!matches[1] && matches[2] == '/') { // commands
      if (this.commands && this.commands.index) {
        if (query.length) {
          var foundObject = SearchIndexManager.search(query, this.commands.index)
          var foundCommands = []
          var command
          for (var i = 0, length = this.commands.list.length; i < length; i++) {
            command = this.commands.list[i]
            if (foundObject[command.value]) {
              foundCommands.push(command)
            }
          }
        } else {
          var foundCommands = this.commands.list
        }
        if (foundCommands.length) {
          this.showCommandsSuggestions(foundCommands)
        } else {
          this.hideSuggestions()
        }
      } else {
        this.hideSuggestions()
      }
    }
    else if (matches[2] == ':') { // emoji
      EmojiHelper.getPopularEmoji((function (popular) {
        if (query.length) {
          var found = EmojiHelper.searchEmojis(query)
          if (found.length) {
            var popularFound = [],
              code
            var pos
            for (var i = 0, len = popular.length; i < len; i++) {
              code = popular[i].code
              pos = found.indexOf(code)
              if (pos >= 0) {
                popularFound.push(code)
                found.splice(pos, 1)
                if (!found.length) {
                  break
                }
              }
            }
            this.showEmojiSuggestions(popularFound.concat(found))
          } else {
            this.hideSuggestions()
          }
        } else {
          this.showEmojiSuggestions(popular)
        }
      }).bind(this))
    }
  }else {
    delete this.previousQuery
    this.hideSuggestions()
  }
}

MessageComposer.prototype.onFocusBlur = function (e) {
  this.isActive = e.type == 'focus'

  if (!this.isActive) {
    this.cleanRichTextarea()
    this.hideSuggestions()
  } else {
    setTimeout(this.checkAutocomplete.bind(this), 100)
  }
  if (this.richTextareaEl) {
    document.execCommand('enableObjectResizing', !this.isActive, !this.isActive)
  }
}

MessageComposer.prototype.onRichPaste = function (e) {
  var cData = (e.originalEvent || e).clipboardData
  var items = cData && cData.items || [],
    i
  for (i = 0; i < items.length; i++) {
    if (items[i].kind == 'file') {
      e.preventDefault()
      return true
    }
  }

  try {
    var text = cData.getData('text/plain')
  } catch (e) {
    return true
  }
  setZeroTimeout(this.onChange.bind(this), 0)
  if (text.length) {
    document.execCommand('insertText', false, text)
    return cancelEvent(e)
  }
  return true
}

MessageComposer.prototype.cleanRichTextarea = function (value, focused) {
  if (!this.richTextareaEl[0]) {
    return
  }
  if (value === undefined) {
    value = getRichValue(this.richTextareaEl[0])
  }
  if (value.match(/^\s*$/) && this.richTextareaEl.html().length > 0) {
    this.richTextareaEl.html('')
    this.lastLength = 0
    this.wasEmpty = true

    if (focused) {
      var self = this
      setZeroTimeout(function () {
        self.focus()
      })
    }
  }
}

MessageComposer.prototype.onRichPasteNode = function (e) {
  var element = (e.originalEvent || e).target
  var src = (element || {}).src || ''
  var remove = false

  if (src.substr(0, 5) == 'data:') {
    remove = true
    var blob = dataUrlToBlob(src)
    this.onFilePaste(blob)
    setZeroTimeout(function () {
      element.parentNode.replaceChild(document.createTextNode('   '), element)
    })
  }
  else if (src && !src.match(/img\/blank\.gif/)) {
    var replacementNode = document.createTextNode(' ' + src + ' ')
    setTimeout(function () {
      element.parentNode.replaceChild(replacementNode, element)
    }, 100)
  }
}

MessageComposer.prototype.onEmojiSelected = function (code, autocomplete) {
  if (this.richTextareaEl) {
    var textarea = this.richTextareaEl[0]
    if (!this.isActive) {
      if (!this.restoreSelection()) {
        setRichFocus(textarea)
      }
    }
    if (autocomplete) {
      var valueCaret = getRichValueWithCaret(textarea)
      var fullValue = valueCaret[0]
      var pos = valueCaret[1] >= 0 ? valueCaret[1] : fullValue.length
      var suffix = fullValue.substr(pos)
      var prefix = fullValue.substr(0, pos)
      var matches = prefix.match(/:([\S]*)$/)
      var emoji = EmojiHelper.emojis[code]

      var newValuePrefix
      if (matches && matches[0]) {
        newValuePrefix = prefix.substr(0, matches.index) + ':' + emoji[1] + ':'
      } else {
        newValuePrefix = prefix + ':' + emoji[1] + ':'
      }
      textarea.value = newValue

      var html
      if (suffix.length) {
        this.selId = (this.selId || 0) + 1
        html = this.getRichHtml(newValuePrefix) + '&nbsp;<span id="composer_sel' + this.selId + '"></span>' + this.getRichHtml(suffix)
        this.richTextareaEl.html(html)
        setRichFocus(textarea, $('#composer_sel' + this.selId)[0])
      } else {
        html = this.getRichHtml(newValuePrefix) + '&nbsp;'
        this.richTextareaEl.html(html)
        setRichFocus(textarea)
      }
    } else {
      var html = this.getEmojiHtml(code)
      if (window.getSelection) {
        var sel = window.getSelection()
        if (sel.getRangeAt && sel.rangeCount) {
          var el = document.createElement('div')
          el.innerHTML = html
          var node = el.firstChild
          var range = sel.getRangeAt(0)
          range.deleteContents()
          range.insertNode(document.createTextNode(' '))
          range.insertNode(node)
          range.setStart(node, 0)

          setTimeout(function () {
            range = document.createRange()
            range.setStartAfter(node)
            range.collapse(true)
            sel.removeAllRanges()
            sel.addRange(range)
          }, 0)
        }
      } else if (document.selection && document.selection.type != 'Control') {
        document.selection.createRange().pasteHTML(html)
      }
    }
  }else {
    var textarea = this.textareaEl[0]
    var fullValue = textarea.value
    var pos = this.isActive ? getFieldSelection(textarea) : fullValue.length
    var suffix = fullValue.substr(pos)
    var prefix = fullValue.substr(0, pos)
    var matches = autocomplete && prefix.match(/:([\S]*)$/)
    var emoji = EmojiHelper.emojis[code]

    if (matches && matches[0]) {
      var newValue = prefix.substr(0, matches.index) + ':' + emoji[1] + ': ' + suffix
      var newPos = matches.index + emoji[1].length + 3
    } else {
      var newValue = prefix + ':' + emoji[1] + ': ' + suffix
      var newPos = prefix.length + emoji[1].length + 3
    }
    textarea.value = newValue
    setFieldSelection(textarea, newPos)
  }

  this.hideSuggestions()
  this.onChange()
}

MessageComposer.prototype.onMentionsUpdated = function (username) {
  delete this.previousQuery
  if (this.isActive) {
    this.checkAutocomplete()
  }
}

MessageComposer.prototype.onMentionSelected = function (username, firstName) {
  var hasUsername = true;
  if (username.charAt(0) == '#') {
    hasUsername = false;
    username = username.substr(1);
    firstName = firstName.replace(/\(\)@/, '')
  }

  if (this.richTextareaEl) {
    var textarea = this.richTextareaEl[0]
    if (!this.isActive) {
      if (!this.restoreSelection()) {
        setRichFocus(textarea)
      }
    }
    var valueCaret = getRichValueWithCaret(textarea)
    var fullValue = valueCaret[0]
    var pos = valueCaret[1] >= 0 ? valueCaret[1] : fullValue.length
    var suffix = fullValue.substr(pos)
    var prefix = fullValue.substr(0, pos)
    var matches = prefix.match(/@([\S]*)$/)

    var newValuePrefix
    if (matches && matches[0]) {
      newValuePrefix = prefix.substr(0, matches.index) + '@' + username
    } else {
      newValuePrefix = prefix + '@' + username
    }

    var html
    if (hasUsername) {
      if (suffix.length) {
        this.selId = (this.selId || 0) + 1
        html = this.getRichHtml(newValuePrefix) + '&nbsp;<span id="composer_sel' + this.selId + '"></span>' + this.getRichHtml(suffix)
        this.richTextareaEl.html(html)
        setRichFocus(textarea, $('#composer_sel' + this.selId)[0])
      } else {
        html = this.getRichHtml(newValuePrefix) + '&nbsp;'
        this.richTextareaEl.html(html)
        setRichFocus(textarea)
      }
    } else {
      this.selId = (this.selId || 0) + 1
      html = this.getRichHtml(newValuePrefix) + '&nbsp;(<span id="composer_sel' + this.selId + '">' + encodeEntities(firstName) + '</span>)&nbsp;' + this.getRichHtml(suffix)
      this.richTextareaEl.html(html)
      setRichFocus(textarea, $('#composer_sel' + this.selId)[0], true)
    }
  } else {
    var textarea = this.textareaEl[0]
    var fullValue = textarea.value
    var pos = this.isActive ? getFieldSelection(textarea) : fullValue.length
    var suffix = fullValue.substr(pos)
    var prefix = fullValue.substr(0, pos)
    var matches = prefix.match(/@([\S]*)$/)

    var newValuePrefix
    var newValue
    var newPos
    var newPosTo
    if (matches && matches[0]) {
      newValuePrefix = prefix.substr(0, matches.index) + '@' + username
    } else {
      newValuePrefix = prefix + '@' + username
    }

    if (hasUsername) {
      newValue = newValuePrefix + '@' + username + ' ' + suffix
      newPos = matches.index + username.length + 2
    } else {
      newValue = newValuePrefix + '@' + username + ' (' + firstName + ') ' + suffix
      newPos = matches.index + username.length + 2
      newPosTo = newPos + firstName.length
    }
    textarea.value = newValue
    setFieldSelection(textarea, newPos, newPosTo)
  }

  this.hideSuggestions()
  this.onChange()
}

MessageComposer.prototype.onCommandSelected = function (command, isTab) {
  if (isTab) {
    if (this.richTextareaEl) {
      this.richTextareaEl.html(encodeEntities(command) + '&nbsp;')
      setRichFocus(this.richTextareaEl[0])
    }else {
      var textarea = this.textareaEl[0]
      textarea.value = command + ' '
      setFieldSelection(textarea)
    }
  } else {
    this.onCommandSend(command)
  }

  this.hideSuggestions()
  this.onChange()
}

MessageComposer.prototype.onChange = function (e) {
  if (this.richTextareaEl) {
    delete this.keyupStarted
    var richValue = getRichValue(this.richTextareaEl[0])
    this.textareaEl.val(richValue).trigger('change')
  }
  this.updateInlinePlaceholder()
}

MessageComposer.prototype.getEmojiHtml = function (code, emoji) {
  emoji = emoji || EmojiHelper.emojis[code]
  var iconSize = 20
  var spritesheet = EmojiHelper.spritesheetPositions[code]
  var categoryIndex = spritesheet[0]
  var pos = spritesheet[1]
  var x = iconSize * spritesheet[3]
  var y = iconSize * spritesheet[2]

  return '<img src="img/blank.gif" alt=":' + encodeEntities(emoji[1]) + ':" data-code="' + encodeEntities(code) + '" class="emoji emoji-w20 emoji-spritesheet-' + categoryIndex + '" style="background-position: -' + x + 'px -' + y + 'px;" onresizestart="return false" />'
}

MessageComposer.prototype.setValue = function (text) {
  if (this.richTextareaEl) {
    this.richTextareaEl.html(this.getRichHtml(text))
    this.lastLength = text.length
    this.wasEmpty = !text.length
    this.onKeyEvent({type: 'keyup'})
  } else {
    this.textareaEl.val(text)
  }
}

MessageComposer.prototype.setFocusedValue = function (parts) {
  var prefix = parts[0]
  var selection = parts[1]
  var suffix = parts[2]

  if (this.richTextareaEl) {
    this.selId = (this.selId || 0) + 1
    var html =
    this.getRichHtml(prefix) +
    '<span id="composer_sel' + this.selId + '">' +
    this.getRichHtml(selection) +
    '</span>' +
    this.getRichHtml(suffix)

    this.richTextareaEl.html(html)

    setRichFocus(this.richTextareaEl[0], $('#composer_sel' + this.selId)[0], true)
  } else {
    this.textareaEl.val(prefix + selection + suffix)
    setFieldSelection(this.textareaEl[0], prefix.length, prefix.length + selection.length)
  }
}

MessageComposer.prototype.getRichHtml = function (text) {
  var html = $('<div>').text(text).html()
  html = html.replace(/\n/g, '<br/>')
  html = html.replace(/:([A-Za-z0-9\-\+\*_]+?):/gi, (function (all, shortcut) {
    var code = EmojiHelper.shortcuts[shortcut]
    if (code !== undefined) {
      return this.getEmojiHtml(code)
    }
    return all
  }).bind(this))
  html = html.replace(/  /g, ' \u00A0').replace(/^ | $/g, '\u00A0')

  return html
}

MessageComposer.prototype.focus = function () {
  if (this.richTextareaEl) {
    setZeroTimeout((function () {
      setRichFocus(this.richTextareaEl[0])
    }).bind(this))
  } else {
    setFieldSelection(this.textareaEl[0])
  }
}

MessageComposer.prototype.blur = function () {
  if (this.richTextareaEl) {
    this.richTextareaEl[0].blur()
  } else {
    this.textareaEl[0].blur()
  }
}

MessageComposer.prototype.renderSuggestions = function () {
  this.autoCompleteWrapEl.show()
  this.scroller.reinit()
  this.updatePosition()
  this.autocompleteShown = true
}

MessageComposer.prototype.showEmojiSuggestions = function (codes) {
  var self = this
  setZeroTimeout(function () {
    self.autoCompleteScope.$apply(function () {
      self.autoCompleteScope.type = 'emoji'
      self.autoCompleteScope.emojiCodes = codes
    })
    onContentLoaded(function () {
      self.renderSuggestions()
    })
  })
}

MessageComposer.prototype.showMentionSuggestions = function (users) {
  var self = this
  setZeroTimeout(function () {
    self.autoCompleteScope.$apply(function () {
      self.autoCompleteScope.type = 'mentions'
      self.autoCompleteScope.mentionUsers = users
    })
    onContentLoaded(function () {
      self.renderSuggestions()
    })
  })
}

MessageComposer.prototype.showCommandsSuggestions = function (commands) {
  var self = this
  setZeroTimeout(function () {
    self.autoCompleteScope.$apply(function () {
      self.autoCompleteScope.type = 'commands'
      self.autoCompleteScope.commands = commands
    })
    onContentLoaded(function () {
      self.renderSuggestions()
    })
  })
}

MessageComposer.prototype.showInlineSuggestions = function (botResults) {
  if (!botResults || !botResults.results.length) {
    this.hideSuggestions()
    return
  }
  var self = this
  if (self.autoCompleteScope.type == 'inline' &&
    self.autoCompleteScope.botResults == botResults &&
    self.autocompleteShown) {
    return
  }
  setZeroTimeout(function () {
    self.autoCompleteScope.$apply(function () {
      self.autoCompleteScope.type = 'inline'
      self.autoCompleteScope.botResults = botResults
    })
    onContentLoaded(function () {
      self.renderSuggestions()
    })
  })
}

MessageComposer.prototype.setInlineSuggestions = function (botResults) {
  this.curInlineResults = botResults
  this.checkAutocomplete()
}

MessageComposer.prototype.updatePosition = function () {
  var offset = (this.richTextareaEl || this.textareaEl).offset()
  var height = this.scroller.updateHeight()
  var width = $((this.richTextareaEl || this.textareaEl)[0].parentNode).outerWidth()
  this.autoCompleteWrapEl.css({
    top: offset.top - height,
    left: Config.Mobile ? 0 : offset.left,
    width: Config.Mobile ? '100%' : width - 2
  })
  this.scroller.update()
}

MessageComposer.prototype.hideSuggestions = function () {
  // console.trace()
  // return
  this.autoCompleteWrapEl.hide()
  delete this.autocompleteShown
}

MessageComposer.prototype.resetTyping = function () {
  this.lastTyping = 0
  this.lastLength = 0
}

MessageComposer.prototype.setPlaceholder = function (newPlaceholder) {
  (this.richTextareaEl || this.textareaEl).attr('placeholder', newPlaceholder)
}

function Scroller (content, options) {
  options = options || {}
  var classPrefix = options.classPrefix || 'scroller'

  this.content = $(content)
  this.useNano = options.nano !== undefined ? options.nano : !Config.Mobile
  this.maxHeight = options.maxHeight
  this.minHeight = options.minHeight

  if (this.useNano) {
    this.setUpNano()
  } else {
    this.setUpNative()
  }
  this.updateHeight()
}
Scroller.prototype.setUpNano = function () {
  this.content.wrap('<div class="scroller_scrollable_container"><div class="scroller_scrollable_wrap nano"><div class="scroller_scrollable nano-content "></div></div></div>')

  this.scrollable = $(this.content[0].parentNode)
  this.scroller = $(this.scrollable[0].parentNode)
  this.wrap = $(this.scroller[0].parentNode)

  this.scroller.nanoScroller({preventPageScrolling: true, tabIndex: -1})
}

Scroller.prototype.setUpNative = function () {
  this.content.wrap('<div class="scroller_native_scrollable"></div>')
  this.scrollable = $(this.content[0].parentNode)

  this.scrollable.css({overflow: 'auto'})
  if (this.maxHeight) {
    this.scrollable.css({maxHeight: this.maxHeight})
  }
  if (this.minHeight) {
    this.scrollable.css({minHeight: this.minHeight})
  }
}

Scroller.prototype.onScroll = function (cb) {
  var self = this
  var scrollable = this.scrollable[0]
  this.scrollable.on('scroll', function (e) {
    if (self.isAnimatedScroll) {
      return
    }
    cb(scrollable, scrollable.scrollTop)
  })
}

Scroller.prototype.update = function () {
  if (this.useNano) {
    $(this.scroller).nanoScroller()
  }
}

Scroller.prototype.reinit = function () {
  this.scrollTo(0)
  if (this.useNano) {
    setTimeout((function () {
      this.updateHeight()
    }).bind(this), 100)
  }
}

Scroller.prototype.updateHeight = function () {
  var height
  if (this.useNano) {
    if (this.maxHeight || this.minHeight) {
      height = this.content[0].offsetHeight
      if (this.maxHeight && height > this.maxHeight) {
        height = this.maxHeight
      }
      if (this.minHeight && height < this.minHeight) {
        height = this.minHeight
      }
      this.wrap.css({height: height})
    } else {
      height = this.scroller[0].offsetHeight
    }
    $(this.scroller).nanoScroller()
  } else {
    height = this.scrollable[0].offsetHeight
  }
  return height
}

Scroller.prototype.scrollTo = function (scrollTop, animation, cb) {
  if (animation > 0) {
    var self = this
    this.isAnimatedScroll = true
    this.scrollable.animate({scrollTop: scrollTop}, animation, function () {
      delete self.isAnimatedScroll
      if (self.useNano) {
        $(self.scroller).nanoScroller({flash: true})
      }
      self.scrollable.trigger('scroll')
      if (cb) {
        cb()
      }
    })
  } else {
    this.scrollable[0].scrollTop = scrollTop
    if (this.useNano) {
      $(this.scroller).nanoScroller({flash: true})
    }
    if (cb) {
      cb()
    }
  }
}

Scroller.prototype.scrollToNode = function (node) {
  node = node[0] || node
  var elTop = node.offsetTop - 15
  var elHeight = node.offsetHeight + 30
  var scrollTop = this.scrollable[0].scrollTop
  var viewportHeight = this.scrollable[0].clientHeight

  if (scrollTop > elTop) { // we are below the node to scroll
    this.scrollTo(elTop)
  }
  else if (scrollTop < elTop + elHeight - viewportHeight) { // we are over the node to scroll
    this.scrollTo(elTop + elHeight - viewportHeight)
  }
}