# frozen_string_literal: true

# client-server
post '/' do
  protected!
  date = Time.now.strftime('%Y-%m-%dT%H:%M:%S')
  outbox_path = File.join('public/outbox', "#{date}.json")
  notes_path = File.join('public/notes', "#{date}.json")

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

  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(SOCIAL_URL, 'tags', name.sub('#', ''))
        tag << {
          'type' => 'Hashtag',
          'href' => href,
          'name' => name
        }
        line.gsub!(name, "<a href='#{href}' class='mention hashtag' rel='tag'>#{name}</a>")
      end
      content << line
    end
  end

  create = {
    '@context' => 'https://www.w3.org/ns/activitystreams',
    'id' => File.join(SOCIAL_URL, outbox_path),
    'type' => 'Create',
    'actor' => ACTOR,
    'object' => {
      'id' => File.join(SOCIAL_URL, notes_path),
      'type' => 'Note',
      'attributedTo' => ACTOR,
      'inReplyTo' => params[:inReplyTo],
      'published' => date,
      'content' => "<p>\n#{content.join("\n<br>")}\n</p>",
      'attachment' => attachment,
      'tag' => tag,
      'to' => recipients
    },
    'published' => date,
    'to' => recipients
  }

  File.open(outbox_path, 'w+') { |f| f.puts create.to_json }
  File.open(notes_path, 'w+') { |f| f.puts create['object'].to_json }
  tag.each do |t|
    dir = File.join('public', 'tags', t['name'].sub('#', ''))
    FileUtils.mkdir_p dir
    FileUtils.ln_s File.join('/srv/social/', notes_path), dir
  end

  # recipients.delete "https://www.w3.org/ns/activitystreams#Public"
  # recipients.each { |r| send_signed create, r }
  # send_signed create # , r }
  outbox create
  redirect params['redirect']
end

post '/archive' do
  protected!
  FileUtils.mv params['file'], 'archive/'
  redirect to(params['redirect'])
end

post '/delete' do # delete not supported by html forms
  protected!
  FileUtils.rm_f(params['file'] || Dir['inbox/*.json'])
  redirect(params['redirect'] || '/')
end

post '/follow' do
  protected!
  actor, mention = parse_follow params['follow']
  follow = { '@context' => 'https://www.w3.org/ns/activitystreams',
             'id' => File.join(SOCIAL_URL, 'following', "#{mention}.json"),
             'type' => 'Follow',
             'actor' => ACTOR,
             'object' => actor,
             'to' => [actor] }
  send_signed follow # , actor
  redirect '/'
end

post '/unfollow' do
  protected!
  actor, mention = parse_follow params['follow']
  following_path = File.join('public', 'following', "#{mention}.json")
  if File.exist?(following_path)
    undo = { '@context' => 'https://www.w3.org/ns/activitystreams',
             'id' => File.join("#{SOCIAL_URL}#undo", SecureRandom.uuid),
             'type' => 'Undo',
             'actor' => ACTOR,
             'object' => JSON.parse(File.read(following_path)),
             'to' => [actor] }
    send_signed undo # , actor
    FileUtils.rm following_path
    redirect '/'
  end
end

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

get '/' do
  redirect '/inbox'
end

['/inbox', '/archive', '/outbox'].each do |path|
  get path, provides: 'html' do
    protected!
    @items = fetch(File.join(SOCIAL_URL, path))['orderedItems']
    threads
    erb :collection
  end
end

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

  def outbox(activity)
    curl("-X POST -d #{activity.to_json}", File.join(SOCIAL_URL, 'outbox'))
  end

  def threads
    @threads = []
    @items.each do |i|
      i['indent'] = 0
      i['replies'] = []
      if i['inReplyTo'].nil? || @items.select { |it| it['id'] == i['inReplyTo'] }.empty?
        @threads << i
      else
        @items.select { |it| it['id'] == i['inReplyTo'] }.each do |it|
          i['indent'] = it['indent'] + 4
          it['replies'] << i
        end
      end
    end
  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