class Translator

  def self.translate!(filenames)
    writer = CodeWriter.new('hello codewriter I hope you are feeling fine')
    filenames.each do |vm_filename|
      puts "Translating #{vm_filename} ..."
      parser = Parser.new(vm_filename)
      while parser.has_more_commands? do
        writer.begin!(asm_file_name_for(vm_filename))
        parser.advance
        if parser.command_type == :C_ARITHMETIC
          puts "#{parser.index}: #{parser.command.collect{|s| s + ' '}} C_ARITHMETIC"
          writer.write_arithmetic(parser.arg1)
        elsif parser.command_type == :C_PUSH || parser.command_type == :C_POP
          puts "#{parser.index}: #{parser.command.collect{|s| s + ' '}} is C_PUSH or C_POP"
          writer.write_push_pop(parser.command_type, parser.arg1, parser.arg2)
        else
          puts "uhoh, outside of my ability! (for now)"
        end
      end
    end
    writer.close
  end

  def self.asm_file_name_for(vm_filename)
    raise TranslatorException.new('Bad VM filename') unless vm_filename.include?('.vm')
    basename = File.basename(vm_filename, '.vm')
    path = File.split(vm_filename)[0]
    "#{path}/#{basename}.asm"
  end

end