defmodule TreeSitter.Nif do
  def so_contents, do: unquote(File.read!("priv/treesitter_nif.so"))

  def load_nifs do
    # NOTE: Traditionally this is done using the priv dir, but we want to support escript.build, which does not support priv.
    # Instead so_contents() contains the binary contents of the ".so" file and we write it to a temp file and load it.
    # TODO: Can we skip the writing to a file and pass the binary directly to :erlang.load_nif?
    # :erlang.load_nif("priv/treesitter_nif", 0)
    {:ok, path} = Briefly.create()
    File.write!(path <> ".so", so_contents())
    :erlang.load_nif(path, 0)
  end

  @doc """
  Return the full language name and the full path, needed for `parser_set_language` given the language name and the path to search

  ## Examples:

  TreeSitter.Nif.language_path("c", "/usr/lib")
  """
  def language_path(language, path)

  def language_path(nm, pth) do
    # TODO: Use path join, so it is more likely to work on windows
    {"tree_sitter_#{nm}", "#{pth}/libtree-sitter-#{nm}.so"}
  end

  def parser_new() do
    raise "NIF not implemented"
  end

  @doc """
  Set the langage given a full name of the language and the path.

  `language_path` is a useful helper function to get the full language name and path if needed

  ## Examples:

  TreeSitter.Nif.language("tree_sitter_c", "/usr/lib/libtree-sitter-c.so")
  """
  def parser_set_language(parser, language, full_path)

  def parser_set_language(_, _, _) do
    raise "NIF not implemented"
  end

  def parser_parse_string(_, _) do
    raise "NIF not implemented"
  end

  def parse(_, _) do
    raise "NIF not implemented"
  end

  def tree_root_node(_) do
    raise "NIF not implemented"
  end

  def node_parent(_) do
    raise "NIF not implemented"
  end

  def node_child(_) do
    raise "NIF not implemented"
  end

  def node_next_sibling(_) do
    raise "NIF not implemented"
  end

  def node_prev_sibling(_) do
    raise "NIF not implemented"
  end

  def node_string(_) do
    raise "NIF not implemented"
  end

  def node_type(_) do
    raise "NIF not implemented"
  end

  @doc """
  Return the start and end index of the bytestring
  """
  def node_byte_range(_) do
    raise "NIF not implemented"
  end

  def node_point_range(_) do
    raise "NIF not implemented"
  end
end

defmodule TreeSitter.Application do
  @moduledoc """
  Opens a window (tb_init) and kills it on shutdown (tb_shutdown)
  """
  use Application

  @impl true
  def start(_type, _args) do
    TreeSitter.Nif.load_nifs()

    # TODO: Get rid of this dummy supervisor that is only used for its return value
    children = []

    opts = [strategy: :one_for_one, name: TreeSitter.Supervisor]
    sup = Supervisor.start_link(children, opts)
    sup
  end
end