defmodule Pleroma.Web.TwitterAPI.UtilController do
  use Pleroma.Web, :controller
  require Logger
  alias Pleroma.Web
  alias Pleroma.Web.OStatus
  alias Pleroma.Web.WebFinger
  alias Comeonin.Pbkdf2
  alias Pleroma.Formatter
  alias Pleroma.Web.ActivityPub.ActivityPub
  alias Pleroma.{Repo, PasswordResetToken, User}

  def show_password_reset(conn, %{"token" => token}) do
    with %{used: false} = token <- Repo.get_by(PasswordResetToken, %{token: token}),
      %User{} = user <- Repo.get(User, token.user_id) do
      render conn, "password_reset.html", %{
        token: token,
        user: user
      }
    else
      _e -> render conn, "invalid_token.html"
    end
  end

  def password_reset(conn, %{"data" => data}) do
    with {:ok, _} <- PasswordResetToken.reset_password(data["token"], data) do
      render conn, "password_reset_success.html"
    else
      _e -> render conn, "password_reset_failed.html"
    end
  end

  def help_test(conn, _params) do
    json(conn, "ok")
  end

  def remote_subscribe(conn, %{"nickname" => nick, "profile" => _}) do
    with %User{} = user <- User.get_cached_by_nickname(nick),
         avatar = User.avatar_url(user) do
      conn
      |> render("subscribe.html", %{nickname: nick, avatar: avatar, error: false})
    else
      _e -> render(conn, "subscribe.html", %{nickname: nick, avatar: nil, error: "Could not find user"})
    end
  end
  def remote_subscribe(conn, %{"user" => %{"nickname" => nick, "profile" => profile}}) do
    with {:ok, %{"subscribe_address" => template}} <- WebFinger.finger(profile),
         %User{ap_id: ap_id} <- User.get_cached_by_nickname(nick) do
      conn
      |> Phoenix.Controller.redirect(external: String.replace(template, "{uri}", ap_id))
    else
      _e ->
        render(conn, "subscribe.html", %{nickname: nick, avatar: nil, error: "Something went wrong."})
    end
  end

  def remote_follow(%{assigns: %{user: user}} = conn, %{"acct" => acct}) do
    {err, followee} = OStatus.find_or_make_user(acct)
    avatar = User.avatar_url(followee)
    name = followee.nickname
    id = followee.id

    if !!user do
      conn
      |> render("follow.html", %{error: err, acct: acct, avatar: avatar, name: name, id: id})
    else
      conn
      |> render("follow_login.html", %{error: false, acct: acct, avatar: avatar, name: name, id: id})
    end
  end

  def do_remote_follow(conn, %{"authorization" => %{"name" => username, "password" => password, "id" => id}}) do
    followee = Repo.get(User, id)
    avatar = User.avatar_url(followee)
    name = followee.nickname
    with %User{} = user <- User.get_cached_by_nickname(username),
         true <- Pbkdf2.checkpw(password, user.password_hash),
           %User{} = followed <- Repo.get(User, id),
         {:ok, follower} <- User.follow(user, followee),
         {:ok, _activity} <- ActivityPub.follow(follower, followee) do
      conn
      |> render("followed.html", %{error: false})
    else
      _e ->
        conn
        |> render("follow_login.html", %{error: "Wrong username or password", id: id, name: name, avatar: avatar})
    end
  end
  def do_remote_follow(%{assigns: %{user: user}} = conn, %{"user" => %{"id" => id}}) do
    with %User{} = followee <- Repo.get(User, id),
         {:ok, follower} <- User.follow(user, followee),
         {:ok, _activity} <- ActivityPub.follow(follower, followee) do
      conn
      |> render("followed.html", %{error: false})
    else
      e ->
        Logger.debug("Remote follow failed with error #{inspect e}")
      conn
      |> render("followed.html", %{error: inspect(e)})
    end
  end

  @instance Application.get_env(:pleroma, :instance)
  def config(conn, _params) do
    case get_format(conn) do
      "xml" ->
        response = """
        <config>
          <site>
            <name>#{Keyword.get(@instance, :name)}</name>
            <site>#{Web.base_url}</site>
            <textlimit>#{Keyword.get(@instance, :limit)}</textlimit>
            <closed>#{!Keyword.get(@instance, :registrations_open)}</closed>
          </site>
        </config>
        """
        conn
        |> put_resp_content_type("application/xml")
        |> send_resp(200, response)
      _ ->
        json(conn, %{
              site: %{
                name: Keyword.get(@instance, :name),
                server: Web.base_url,
                textlimit: to_string(Keyword.get(@instance, :limit)),
                closed: if(Keyword.get(@instance, :registrations_open), do: "0", else: "1")
              }
             })
    end
  end

  def version(conn, _params) do
    version = Keyword.get(@instance, :version)
    case get_format(conn) do
      "xml" ->
        response = "<version>#{version}</version>"
        conn
        |> put_resp_content_type("application/xml")
        |> send_resp(200, response)
      _ -> json(conn, version)
    end
  end

  def emoji(conn, _params) do
    json conn, Enum.into(Formatter.get_custom_emoji(), %{})
  end

  def follow_import(conn, %{"list" => %Plug.Upload{} = listfile}) do
    follow_import(conn, %{"list" => File.read!(listfile.path)})
  end
  def follow_import(%{assigns: %{user: user}} = conn, %{"list" => list}) do
    Task.start(fn ->
    String.split(list)
    |> Enum.map(fn nick ->
        with %User{} = follower <- User.get_cached_by_ap_id(user.ap_id),
        %User{} = followed <- User.get_or_fetch_by_nickname(nick),
        {:ok, follower} <- User.follow(follower, followed) do
          ActivityPub.follow(follower, followed)
        else
          _e -> Logger.debug "follow_import: following #{nick} failed"
        end
      end)
    end)

    json conn, "job started"
  end
end