defmodule Cringe do
  @moduledoc """
  OTP-native terminal UI toolkit for Elixir.

  Cringe builds terminal documents from plain Elixir data and renders them into
  terminal frames. The API is intentionally small while the package is early.
  """

  alias Cringe.Document.Text

  @doc """
  Builds a text node.

      iex> Cringe.text("hello")
      %Cringe.Document.Text{content: "hello", opts: []}

  """
  @spec text(IO.chardata(), keyword()) :: Text.t()
  def text(content, opts \\ []), do: Text.new(content, opts)

  defmacro __using__(_opts) do
    quote do
      import Cringe
    end
  end

  defmacro column(first \\ [], second \\ []), do: Cringe.DSL.column_ast(first, second)
  defmacro row(first \\ [], second \\ []), do: Cringe.DSL.row_ast(first, second)
  defmacro box(first \\ [], second \\ []), do: Cringe.DSL.box_ast(first, second)

  @doc """
  Renders a terminal document to a string.

      iex> Cringe.text("hello") |> Cringe.render(width: 3)
      "hel"

  """
  @spec render(Cringe.Document.t(), Cringe.Renderer.render_opts()) :: String.t()
  def render(document, opts \\ []), do: Cringe.Renderer.render(document, opts)

  @doc """
  Renders a terminal document to a frame.
  """
  @spec frame(Cringe.Document.t(), Cringe.Renderer.render_opts()) :: Cringe.Frame.t()
  def frame(document, opts \\ []), do: Cringe.Renderer.frame(document, opts)

  @doc """
  Starts a supervised Cringe runtime.
  """
  @spec run(module(), keyword()) :: GenServer.on_start()
  def run(app, opts \\ []), do: Cringe.Runtime.start_link(Keyword.put(opts, :app, app))
end