class Prince

  attr_accessor :exe_path, :style_sheets, :log_file

  def self.process_directory(digit="")
    princely = Prince.new
    code_style = $settings["code_style"] || "default"
    princely.add_style_sheets("output/#{digit}/styles.css", "layout/code_ray.css")
    html_string = File.new("output/#{digit}/prince_index.html").read
    File.open("output/#{digit}/#{$settings["filename"]}.pdf", 'w') do |f|
      f.puts princely.pdf_from_string(html_string)
    end
  end

  # Initialize method
  #
  def initialize()
    # Finds where the application lives, so we can call it.
    @exe_path = `which prince`.chomp
    @style_sheets = ''
    @log_file = "log/prince.log"
  end

  # Sets stylesheets...
  # Can pass in multiple paths for css files.
  #
  def add_style_sheets(*sheets)
    for sheet in sheets do
      @style_sheets << " -s #{sheet} "
    end
  end

  # Returns fully formed executable path with any command line switches
  # we've set based on our variables.
  #
  def exe_path
    # Add any standard cmd line arguments we need to pass
    @exe_path << " --input=html --server --log=#{@log_file} "
    @exe_path << @style_sheets
    return @exe_path
  end

  # Makes a pdf from a passed in string.
  #
  # Returns PDF as a stream, so we can use send_data to shoot
  # it down the pipe using Rails.
  #
  def pdf_from_string(string)
    path = self.exe_path()
    # Don't spew errors to the standard out...and set up to take IO
    # as input and output
    path << ' --javascript --silent - -o -'
    #path << ' --no-compress --silent - -o -'

    # Show the command used...
    #logger.info "\n\nPRINCE XML PDF COMMAND"
    #logger.info path
    #logger.info ''

    # Actually call the prince command, and pass the entire data stream back.
    pdf = IO.popen(path, "w+")
    pdf.puts(string)
    pdf.close_write
    output = pdf.gets(nil)
    pdf.close_read
    return output
  end
end
