var nest = require('depnest')
var { h, Array: MutantArray } = require('mutant')
// var maxBy = require('lodash/maxBy')
// var markdown = require('ssb-markdown')
// var ref = require('ssb-ref')
// var htmlEscape = require('html-escape')

// function renderEmoji (emoji, url) {
//   if (!url) return ':' + emoji + ':'
//   return `
//     <img
//       src="${htmlEscape(url)}"
//       alt=":${htmlEscape(emoji)}:"
//       title=":${htmlEscape(emoji)}:"
//       class="emoji"
//     >
//   `
// }

exports.gives = nest('app.html.blogCard', true)

exports.needs = nest({
  'keys.sync.id': 'first',
  'history.sync.push': 'first',
  'about.obs.color': 'first',
  'about.obs.name': 'first',
  'about.html.avatar': 'first',
  'unread.sync.isUnread': 'first',
  'message.html.channel': 'first',
  'message.html.timeago': 'first',
  'blob.sync.url': 'first',
  'emoji.sync.url': 'first',

  'blog.html.title': 'first',
  'blog.html.summary': 'first',
  'blog.html.thumbnail': 'first'
})

exports.create = function (api) {
  // render markdown, but don't support patchwork@2 style mentions or custom emoji right now.
  // function render (source) {
  //   return markdown.block(source, {
  //     emoji: (emoji) => {
  //       return renderEmoji(emoji, api.emoji.sync.url(emoji))
  //     },
  //     toUrl: (id) => {
  //       if (ref.isBlob(id)) return api.blob.sync.url(id)
  //       return id
  //     },
  //     imageLink: (id) => id
  //   })
  // }

  // render the icon for a blog.
  // it would be more depjecty to split this
  // into two methods, one in a private plugin
  // one in a channel plugin
  // function blogIcon (msg) {
  //   if (msg.value.private) {
  //     const myId = api.keys.sync.id()

  //     return msg.value.content.recps
  //       .map(link => isString(link) ? link : link.link)
  //       .filter(link => link !== myId)
  //       .map(link => api.about.html.avatar)
  //   } else if (msg.value.content.channel) { return '#' + msg.value.content.channel }
  // }

  // REFACTOR: move this to a template?
  // function buildRecipientNames (blog) {
  //   const myId = api.keys.sync.id()

  //   return blog.value.content.recps
  //     .map(link => isString(link) ? link : link.link)
  //     .filter(link => link !== myId)
  //     .map(api.about.obs.name)
  // }

  return nest('app.html.blogCard', (blog, opts = {}) => {
    if (!blog.value) return

    // const lastReply = blog.replies && maxBy(blog.replies, r => r.timestamp)

    const goToBlog = () => api.history.sync.push(blog)
    const onClick = opts.onClick || goToBlog
    const id = `${blog.key.replace(/[^a-z0-9]/gi, '')}` // -${JSON.stringify(opts)}`
    // id is only here to help morphdom morph accurately

    const { content, author } = blog.value

    var img = h('Thumbnail')

    var image = api.blog.html.thumbnail(blog)

    if (image) {
      // Hey this works! fit an image into a specific size (see blog-card.mcss)
      // centered, and scaled to fit the square (works with both landscape and portrait!)
      // This is functional css not opinionated css, so all embedded.
      img.style = 'background-image: url("' + api.blob.sync.url(image) + '"); background-position:center; background-size: cover;'
    } else {
      var style = { 'background-color': api.about.obs.color(blog.key) }
      img = h('Thumbnail -empty', { style }, [
        h('i.fa.fa-file-text-o')
      ])
    }

    var classList = MutantArray(['-arriving'])
    if (blog.unread) classList.push('-unread')

    var b = h('BlogCard', { id, classList, 'ev-click': onClick }, [
      h('div.context', [
        api.about.html.avatar(author, 'tiny'),
        h('div.name', api.about.obs.name(author)),
        api.message.html.timeago(blog)
      ]),
      h('div.content', [
        img,
        h('div.text', [
          h('h2', api.blog.html.title(blog)),
          content.channel
            ? api.message.html.channel(blog)
            : '',
          h('div.summary', api.blog.html.summary(blog))
        ])
      ])
    ])

    arrive()
    return b

    function arrive () {
      if (!b.parentNode) return setTimeout(arrive, 100)
      classList.delete('-arriving')
    }
  })
}