import shelve
import os


def highscore(player_name, player_score):
    """
    Function to return the high score from our
    persistent storage of score records for a given
    person.
    """
    # Get our working directory
    working_dir = os.getcwd()
    # Create our shelf object for a player
    highscore_fn = os.path.join(working_dir, 'highscore.shelve')
    # Set our player info
    player = {'name': player_name, 'score': player_score}

    with shelve.open(highscore_fn, writeback=True) as shelf:
        # Check if any records exist in the shelf
        if len(shelf) == 0:
            # Assign the shelf to an empty list
            shelf['player_data'] = []
            # Append player data to shelf
            shelf['player_data'].append(player)
            # Current high score for player
            high_score = player.get('score')
        else:
            # Loop through our player data list
            for data in shelf['player_data']:
                # Check to see if we have data for a player
                if player['name'] in data['name']:
                    existing_record = data
                    # Compare the player's new score against previous score
                    if player.get('score') > existing_record.get('score'):
                        high_score = player.get('score')
                        # Update our record for the player
                        existing_record.update(player)
                    else:
                        high_score = existing_record.get('score')
                else:
                    high_score = player.get('score')
                    shelf['player_data'].append(player)

    # Return the high score
    return high_score