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## wrap user interaction, such that client libraries may provide own implementation

class Ui:

  # For now, primarily define this for replacement in unittests
  GLOBAL_UI = None

  @staticmethod
  def get_ui():
      if Ui.GLOBAL_UI == None:
          return Ui()
      return Ui.GLOBAL_UI

  @staticmethod
  def set_ui(ui):
       Ui.GLOBAL_UI = ui
    
  def get_backup_path(self):
    """Interactive function asking the user to choose a path for backup"""
    backup_path = raw_input("Please enter backup pathname: ")
    print("backing up to %s"%backup_path)
    return backup_path

  def prompt_del_abort_retry(self, prompt, allow_skip = False):
    """Interactive function asking the user to choose a conflict resolution"""
    if allow_skip:
      valid_modes = ['(d)elete and replace', '(a)bort', '(b)ackup and replace', '(s)kip']
    else:
      valid_modes = ['(d)elete and replace', '(a)bort', '(b)ackup and replace']
  
    mode = ""
  
    full_prompt = "%s %s: "%(prompt, ", ".join(valid_modes))
  
    while mode == "":
  
      mode_input = raw_input(full_prompt)
      if mode_input == 'b' or mode_input == 'backup':
        mode = 'backup'
      elif mode_input == 'd' or mode_input =='delete':
        mode = 'delete'
      elif mode_input == 'a' or mode_input =='abort':
        mode = 'abort'
      elif allow_skip and mode_input == 's' or mode_input =='skip':
        mode = 'skip'
    return mode

