var h = require('hyperscript')
var u = require('../util')
var pull = require('pull-stream')
var Scroller = require('pull-scroll')
var ref = require('ssb-ref')

var plugs = require('../plugs')

var message_render = plugs.first(exports.message_render = [])
var message_compose = plugs.first(exports.message_compose = [])
var message_unbox = plugs.first(exports.message_unbox = [])
var sbot_log = plugs.first(exports.sbot_log = [])
var sbot_whoami = plugs.first(exports.sbot_whoami = [])
var avatar_image_link = plugs.first(exports.avatar_image_link = [])
var emoji_url = plugs.first(exports.emoji_url = [])

function unbox () {
  return pull(
    pull.filter(function (msg) {
      return 'string' == typeof msg.value.content
    }),
    pull.map(function (msg) {
      return message_unbox(msg)
    }),
    pull.filter(Boolean)
  )
}

exports.builtin_tabs = function () {
  return ['/private']
}

exports.screen_view = function (path) {
  if(path !== '/private') return

  var div = h('div.column.scroller',
      {style: {'overflow':'auto'}})

  // if local id is different from sbot id, sbot won't have indexes of
  // private threads
  var id = require('../keys').id
  sbot_whoami(function (err, feed) {
    if (err) return console.error(err)
    if(id !== feed.id)
      return div.appendChild(h('h4',
        'Private messages are not supported in the lite client.'))

    var compose = message_compose(
      {type: 'post', recps: [], private: true},
      {
        prepublish: function (msg) {
          msg.recps = [id].concat(msg.mentions).filter(function (e) {
            return ref.isFeed('string' === typeof e ? e : e.link)
          })
          if(!msg.recps.length)
            throw new Error('cannot make private message without recipients - just mention the user in an at reply in the message you send')
          return msg
        },
        placeholder: 'Write a private message'
      }
      )

    var content = h('div.column.scroller__content')
    div.appendChild(h('div.scroller__wrapper', compose, content))

    pull(
      u.next(sbot_log, {old: false, limit: 100}),
      unbox(),
      Scroller(div, content, message_render, true, false)
    )

    pull(
      u.next(sbot_log, {reverse: true, limit: 1000}),
      unbox(),
      Scroller(div, content, message_render, false, false, function (err) {
        if(err) throw err
      })
    )
  })

  return div
}

function map(ary, iter) {
  if(Array.isArray(ary)) return ary.map(iter)
}

exports.message_meta = function (msg) {
  if(msg.value.content.recps || msg.value.private)
    return h('span.row', 'PRIVATE', map(msg.value.content.recps, function (id) {
      return avatar_image_link('string' == typeof id ? id : id.link, 'thumbnail')
    }))
}

exports.message_content_mini = function (msg, sbot)  {
  if (typeof msg.value.content === 'string') {
    var icon = emoji_url('lock')
    return icon
      ? h('img', {className: 'emoji', src: icon})
      : 'PRIVATE'
  }
}