defmodule Blossom.Controllers.Users do
  alias Blossom.Controllers.Users
  alias Blossom.Passwords
  alias KilnCore.Utils

  def word_from_stream(stream) do
    stream
    |> Enum.random()
    |> String.trim()
    |> String.downcase()
  end

  def make_username(params) do
    if File.exists?("/usr/share/dict/words") do
      stream = File.stream!("/usr/share/dict/words")
      word_one = Users.word_from_stream(stream)
      word_two = Users.word_from_stream(stream)

      "#{word_one}-#{word_two}-#{Enum.random(1..100)}"
    else
      params["email"]
      |> String.split("@")
      |> List.first()
    end
  end

  def new_user_params(params) do
    params
    |> Map.replace("email", String.downcase(params["email"]))
    |> Map.replace("password", Passwords.hash(params["password"]))
    |> Map.put_new("username", Users.make_username(params))
  end

  def make_user(outcome, params, model) do
    case outcome do
      {:ok, _} ->
        params
        |> Users.new_user_params()
        |> model.new(:public)

      error ->
        error
    end
  end

  def autojoin_orgs(outcome, ctx) do
    case outcome do
      {:ok, user} -> ctx[:organizations].process_autojoins(user)
      _ -> nil
    end

    outcome
  end

  def queue(outcome, kind, ctx) do
    case outcome do
      {:ok, user} -> ctx[:worker].queue(user.id, kind)
      _ -> nil
    end

    outcome
  end

  def new(params, ctx) do
    if ctx[:settings].is_enabled?("allow_new_users") do
      case params do
        %{"email" => _, "password" => password} ->
          password
          |> ctx[:auth].validate_new_password()
          |> Users.make_user(params, ctx[:model])
          |> Users.autojoin_orgs(ctx)
          |> Users.queue("email_verification", ctx)

        _ ->
          {:error, :missing_fields}
      end
    else
      {:error, :forbidden}
    end
  end

  def login(params, ctx) do
    case params do
      %{"email" => email, "password" => password, "realm" => realm} ->
        %{"email" => String.downcase(email), "realm" => realm}
        |> ctx[:model].get(:system)
        |> List.first()
        |> ctx[:auth].login(password)

      _ ->
        {:error, :missing_fields}
    end
  end

  def verify_email(code, user, ctx) do
    params = %{"code" => code, "kind" => "email_verification"}

    case ctx[:codes].verify(params, user) do
      {:ok, code} ->
        ctx[:model].edit(%{"email_verified" => true}, code.user, :system)

      error ->
        error
    end
  end

  def start_reset_password(params, ctx) do
    case params do
      %{"email" => email, "realm" => realm} ->
        case ctx[:model].get(%{"email" => email, "realm" => realm}, :system) do
          [user] -> Users.queue({:ok, user}, "password_reset", ctx)
          [] -> []
        end

      _ ->
        {:error, :missing_fields}
    end
  end

  def make_new_password(params, ctx) do
    new_params = Map.put(params, "kind", "password_reset")

    case ctx[:codes].verify(new_params, :system) do
      {:ok, code} ->
        %{"password" => Passwords.hash(params["password"])}
        |> ctx[:model].edit(code.user, :system)

      _error ->
        {:error, :forbidden}
    end
  end

  def confirm_reset_password(params, ctx) do
    if params["password"] != nil do
      case ctx[:auth].validate_new_password(params["password"]) do
        {:ok, _} -> Users.make_new_password(params, ctx)
        e -> e
      end
    else
      {:error, :missing_fields}
    end
  end

  defmacro __using__(opts \\ []) do
    quote do
      use KilnCore.Controller, unquote(opts)

      @auth Utils.option_or_mod_replace(
              @caller,
              unquote(opts),
              :auth,
              Auth,
              1,
              0..1
            )

      @organizations Utils.option_or_mod_replace(
                       @caller,
                       unquote(opts),
                       :organizations,
                       Organizations,
                       2
                     )

      @settings Utils.option_or_mod_replace(
                  @caller,
                  unquote(opts),
                  :settings,
                  Settings,
                  2
                )

      @codes Utils.option_or_mod_replace(
               @caller,
               unquote(opts),
               :otp_codes,
               OtpCodes,
               2
             )

      @worker Utils.option_or_mod_replace(
                Utils.replace_module(@caller, Workers),
                unquote(opts),
                :worker,
                Mailer,
                2
              )

      @ctx [
        auth: @auth,
        codes: @codes,
        model: @model,
        organizations: @organizations,
        settings: @settings,
        worker: @worker
      ]

      def new(params, _user, _opts) do
        Users.new(params, @ctx)
      end

      def login(params, _user, _opts), do: Users.login(params, @ctx)

      def verify_email(code, user, _opts) do
        Users.verify_email(code, user, @ctx)
      end

      def start_reset_password(params, _user, _opts) do
        Users.start_reset_password(params, @ctx)
      end

      def confirm_reset_password(params, _user, _opts) do
        Users.confirm_reset_password(params, @ctx)
      end

      defoverridable new: 3,
                     login: 3,
                     verify_email: 3,
                     start_reset_password: 3,
                     confirm_reset_password: 3
    end
  end
end