defmodule Makeup do
  alias Makeup.Formatters.HTML.HTMLFormatter
  alias Makeup.Lexers.ElixirLexer
  alias Makeup.Styles.HTML.StyleMap
  alias Makeup.Styles.HTML.Style
  alias Makeup.Pickers
  require StyleMap


  @doc """
  Highlights the given string using the given lexer and formatter.

  By default it highlight the Elixir language using HTML
  """
  def highlight(source, options \\ []) do
    lexer = case options[:lexer] do
      nil -> ElixirLexer
      module when is_atom(module) -> module
      name -> Pickers.pick_lexer!(name)
    end

    formatter = case options[:formatter] do
      nil -> HTMLFormatter
      module when is_atom(module) -> module
      name -> Pickers.pick_lexer!(name)
    end

    tokens = apply(lexer, :lex, [source])
    apply(formatter, :format, [tokens])
  end

  def highlight_inner_html(source, options \\ []) do
    lexer = case options[:lexer] do
      nil -> ElixirLexer
      module when is_atom(module) -> module
      name -> Pickers.pick_lexer!(name)
    end

    tokens = apply(lexer, :lex, [source])
    apply(HTMLFormatter, :format_inner, [tokens])
  end

  @doc """
  Generates a CSS stylesheet for highlighted code for the given style.

  The `css_class` arguments is the top level class for highlighted code.
  For example, if the `css_class` is `"highlight"` (the default), the stylesheet
  has the form:
  
  ```css
  .highlight .someclass {...}
  .highlight .anotherclass {...}
  ```
  ...
  """
  def stylesheet(style \\ StyleMap.default_style(), css_class \\ "highlight") do
    Style.stylesheet(style, css_class)
  end

end