# -*- coding: utf-8 -*-

class Learner:
    """ All functionality within the learners rights. """

    def __init__(self, display, coach):
        self._display = display
        self._coach = coach
        self._ex = None
        self._curr_in = None
        pass
    
    def run(self):
        """ As long as user does exercises.
        Doing Exercises is terminated by another choice in the menu
        or by the user going bach to the OS.
        """
        self._coach.request_exercise()
        self._display.init_calc() #TODOWN091101 take Exercise as argument
        
    def start_calcs(self, exercise):
        self._ex = exercise
        self._display.set_curr_exerc(exercise)
        _calc = self._ex.get_next_calc()
        _lines, self._input = exercise.format(_calc)
        self._display.display_calc(_lines)
        self._curr_in = self._input.pop() #need _curr_in in notify
        self._display.create_entryline(self._curr_in)
        
    def digit_done(self):
        (lino, pos, dig, proterr, protok, li) = self._curr_in
        self._display.create_entryline((lino, -1, dig, proterr, protok, li))
        try: # _input.pop()
            self._curr_in = self._input.pop()
            self._display.create_entryline(self._curr_in)
        except IndexError: # start new calc
            self._display.show_progress()
            try: # get_next_calc
                _calc = self._ex.get_next_calc()
                print('in learner.notify: calc=', _calc)
                _lines, self._input = self._ex.format(_calc)
                self._display.display_calc(_lines)
                self._curr_in = self._input.pop() #need _curr_in in notify
                self._display.create_entryline(self._curr_in)
                # create_entryline sets the callback from gtk to Display
            except IndexError:
                self._display.finish_calc()