# client-server
post "/outbox" 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 => ["jpeg","png"],
    :audio => ["flac","wav","mp3","ogg"],
    :video => ["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 }

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

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

post "/delete" do
  protected!
  FileUtils.rm params['file']
  redirect to(params['redirect'])
end

post "/delete_all" do
  protected!
  FileUtils.rm Dir["inbox/*.json"]
  redirect to("/")
end

post "/follow/*" do
  protected!
  mention = params['splat'][0]
  actor = actor(mention)
  return 502 unless actor
  follow = { "@context" => "https://www.w3.org/ns/activitystreams",
             "id" => File.join(SOCIAL_URL, "following", mention + ".json"),
             "type" => "Follow",
             "actor" => ACTOR,
             "object" => actor }
  send_signed follow, actor
  redirect to("/")
end

post "/unfollow/*" do
  protected!
  mention = params['splat'][0]
  actor = actor(mention)
  return 502 unless actor
  following_path = File.join("public", "following", mention + ".json")
  if File.exists?(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)) }
    send_signed undo, actor
    FileUtils.rm following_path
    redirect to("/")
  end
end

post "/login" do
  session["client"] = true if params["secret"] == File.read(".pwd").chomp
  redirect to("/")
end

# private
["/", "/archive"].each do |path|
  get path, :provides => 'html' do
    protected!
    if path == '/' 
      @dir = 'inbox' 
      @alt_dir = '/archive' 
      @alt_name = 'archive'
    else
      @dir = path.sub('/','')
      @alt_dir = '/'
      @alt_name = 'inbox'
    end
    threads
    erb :index
  end
end

helpers do

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

  def items
    nr = 0
    files = Dir[File.join(@dir, '*.json')] + Dir['public/notes/*.json']
    @items = files.sort.collect do |file|
      item = JSON.parse(File.read(file))
      mention = mention(item['attributedTo'])
      following_path = File.join('public', 'following', mention + '.json')
      File.exists?(following_path) ? follow = 'unfollow' : follow = 'follow'
      nr += 1
      { :id => item['id'],
        :nr => nr,
        :parent => item['inReplyTo'],
        :file => file,
        :actor_url => item['attributedTo'],
        :mention => mention,
        :follow => follow,
        :content => item['content'],
        :attachment => item['attachment'],
        :indent => 2,
        :replies => []
      }
    end.compact
    @items.last[:nr] = @items.last[:nr] - 2 unless @items.empty?
  end

  def threads
    items
    @threads = []
    @items.each do |i|
      if i[:parent].nil? or @items.select{|it| it[:id] == i[:parent] }.empty?
        @threads << i
      else
        @items.select{|it| it[:id] == i[:parent] }.each do |it|
          i[:indent] = it[:indent] + 2
          it[:replies] << i
        end
      end
    end
  end

  def html item
    @item = item
    erb :item
  end

  def people
    File.read('cache/people.tsv').split("\n").collect {|l| l.chomp.split("\t")}
  end

  def mention actor
    person = people.select{|p| p[1] == actor} 
    if person.empty?
      a = fetch(actor)
      return nil unless a
      mention = "#{a["preferredUsername"]}@#{URI(actor).host}"
      File.open('cache/people.tsv','a'){|f| f.puts "#{mention}\t#{actor}"}
      mention
    else
      person[0][0]
    end
  end

  def actor mention
    mention = mention.sub(/^@/, '').chomp
    actors = people.select{|p| p[0] == mention} 
    if actors.empty?
      user, server = mention.split("@")
      a = fetch("https://#{server}/.well-known/webfinger?resource=acct:#{mention}", "application/jrd+json")
      return nil unless a
      actor = a["links"].select { |l|
        l["rel"] == "self"
      }[0]["href"]
      File.open('cache/people.tsv','a'){|f| f.puts "#{mention}\t#{actor}"}
      actor
    else
      actors[0][1]
    end
  end

end