# -*- 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 notify(self, (msg, data)):
        '''called by the observed objects'''
        #print('in learner.notify: msg=,data=', msg, data)
        if msg == 'start-calcs': # from Coach
            self._ex = data
            self._display.set_curr_exerc(data)
            _calc = self._ex.get_next_calc()
            _lines, self._input = data.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
        if msg == 'digit-done': # from Display
            #print('in learner.notify, digit-done: _input=', self._input)
            (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()