# frozen_string_literal: true

# client-server
post '/' do # TODO
  protected!
  Time.now.strftime('%Y-%m-%dT%H:%M:%S.%N')

  recipients = public
  recipients << params[:to]

  content = []
  attachment = []
  tag = []
  extensions = {
    image: %w[jpeg png],
    audio: %w[flac wav mp3 ogg],
    video: %w[mp4 webm]
  }
  params[:content].lines.each do |line|
    line.chomp!
    if line.match(/^http/)
      ext = File.extname(line).sub('.', '')
      media_type = extensions.select { |_k, v| v.include? ext }.keys[0].to_s + '/' + ext
      attachment << {
        'type' => 'Document',
        'mediaType' => media_type,
        'url' => line
      }
    else
      tags = line.split(/\s+/).grep(/^#\w+$/)
      tags.each do |name|
        # href = File.join(TAGS_URL, name.sub('#', ''))
        tag_url = File.join(TAGS_URL, name.sub('#', ''))
        tag << {
          'type' => 'Hashtag',
          'href' => tag_url,
          'name' => name
        }
      end

      mentions = line.split(/\s+/).grep(/^@\w+@\S+$/)
      mentions.each do |mention|
        actor = actor(mention)
        tag << {
          'type' => 'Mention',
          'href' => actor,
          'name' => mention
        }
      end
      content << line
    end
  end

  object = {
    'type' => 'Note',
    'attributedTo' => ACTOR,
    'inReplyTo' => params[:inReplyTo],
    'content' => "<p>\n#{content.join("\n<br>")}\n</p>",
    'attachment' => attachment,
    'tag' => tag,
    'to' => recipients
  }

  activity = outbox 'Create', object, recipients, true
  activity['object']['tag'].each do |tag|
    next unless tag['type'] == 'Hashtag'

    tag_path = File.join(TAGS_DIR, tag['name'].sub('#', '')) + '.json'
    unless File.exist? tag_path
      File.open(tag_path, 'w+') do |f|
        tag_collection = {
          '@context' => 'https://www.w3.org/ns/activitystreams',
          'id' => tag['href'],
          'type' => 'OrderedCollection',
          'totalItems' => 0,
          'orderedItems' => []
        }
        f.puts tag_collection.to_json
      end
    end
    update_collection tag_path, activity['object']['id']
  end
  redirect(params['anchor'] || '/inbox')
end

post '/delete' do
  protected!
  collection = Kernel.const_get(params['dir'].upcase)
  if params['id']
    update_collection collection, params, true
  else
    update_collection collection, JSON.parse(File.read(collection))['orderedItems'], true
  end
  redirect(params['anchor'] || '/inbox')
end

post '/follow' do
  protected!
  actor, = parse_follow params['follow']
  outbox 'Follow', actor, [actor]
  redirect(params['anchor'] || '/inbox')
end

post '/unfollow' do
  protected!
  actor, mention = parse_follow params['follow']
  Dir[File.join(OUTBOX_DIR, 'follow', '*.json')].each do |f|
    activity = JSON.parse(File.read(f))
    if activity['object'] == actor
      outbox 'Undo', activity, [actor]
      update_collection FOLLOWING, actor, true
    end
  end
  redirect(params['anchor'] || '/inbox')
end

post '/share' do # TODO
  protected!
  inbox = JSON.parse File.read(INBOX)
  object = inbox['orderedItems'].find { |i| i['id'] == params['id'] }
  update_collection SHARED, object
  update_collection INBOX, object, true
  recipients = public
  recipients << object['attributedTo']
  outbox 'Announce', params['id'], recipients
  redirect(params['anchor'] || '/inbox')
end

post '/login' do
  session['client'] = (OpenSSL::Digest::SHA256.base64digest(params['secret']) == File.read('.digest').chomp)
  redirect '/inbox'
end

get '/' do
  protected!
  redirect '/inbox'
end

['/inbox', '/shared', '/outbox'].each do |path|
  get path, provides: 'html' do
    protected!
    @dir = path.sub('/', '')
    collection = JSON.parse(File.read(Kernel.const_get(@dir.upcase)))['orderedItems'].uniq
    @threads = []
    collection.each do |object|
      object['indent'] = 0
      object['replies'] = []
      @threads << object if object['inReplyTo'].nil? || collection.select { |o| o['id'] == object['inReplyTo'] }.empty?
    end
    collection.each do |object|
      collection.select { |o| o['id'] == object['inReplyTo'] }.each do |o|
        object['indent'] = o['indent'] + 2
        o['replies'] << object
      end
    end
    erb :collection
  end
end

helpers do
  def protected!
    halt 403 unless session['client']
  end

  def selection(params)
    selection = Dir[File.join(SOCIAL_DIR, params['dir'], '*', '*.json')]
    params['id'] ? selection.select { |f| JSON.parse(File.read(f))['id'] == params['id'] } : selection
  end

  def public
    recipients = ['https://www.w3.org/ns/activitystreams#Public']
    recipients += Dir[File.join(FOLLOWERS, '*.json')].collect { |f| JSON.parse(File.read(f))['actor'] }
    recipients.delete ACTOR
    recipients.uniq
  end

  def parse_follow(follow)
    case follow
    when /^#/
      actor = "https://relay.fedi.buzz/tag/#{follow.sub(/^#/, '')}"
      mention = follow
    when /^http/
      actor = follow
      mention = mention(actor)
    when /^@*\w+@\w+/
      mention = follow
      actor = actor(follow)
      return 502 unless actor
    end
    [actor, mention]
  end
end