naja/gameboard.py

   1 from random import choice
   2
   3 from naja.constants import(
   4     BITS, DIRECTION_BITS, CONDITION_BITS, PLAYER_DEFAULTS,
   5     MOVE, ACT, EXAMINE)
   6 from naja.player import Player
   7 from naja import actions
   8
   9
  10 class GameBoard(object):
  11     """
  12     A representation of the game board.
  13     """
  14
  15     def __init__(self, state, player, board_locations):
  16         self.max_health = state['max_health']
  17         self.wins_required = state['wins_required']
  18         self.health = state['health']
  19         self.wins = state['wins']
  20         self.locations = [item.copy() for item in state['locations']]
  21         self.player = player
  22         self.board_locations = board_locations
  23         self.player_mode = MOVE
  24
  25     @classmethod
  26     def new_game(cls, locations_definition,
  27                  initial_bits=PLAYER_DEFAULTS.INITIAL_BITS,
  28                  initial_pos=PLAYER_DEFAULTS.INITIAL_POS,
  29                  max_health=PLAYER_DEFAULTS.MAX_HEALTH,
  30                  wins_required=PLAYER_DEFAULTS.WINS_REQUIRED):
  31         state = {
  32             'max_health': max_health,
  33             'health': max_health,
  34             'wins_required': wins_required,
  35             'wins': 0,
  36             'locations': locations_definition,
  37         }
  38         player = Player(initial_bits, initial_pos)
  39         board_locations = cls.import_board_locations(
  40             cls.generate_board(locations_definition))
  41         return cls(state, player, board_locations)
  42
  43     @classmethod
  44     def import_game(cls, definition):
  45         state = definition.copy()
  46         player = Player.import_player(state.pop('player'))
  47         board_locations = cls.import_board_locations(
  48             state.pop('board_locations'))
  49         return cls(state, player, board_locations)
  50
  51     def export(self):
  52         return {
  53             'max_health': self.max_health,
  54             'health': self.health,
  55             'wins_required': self.wins_required,
  56             'wins': self.wins,
  57             'locations': [item.copy() for item in self.locations],
  58             'player': self.player.export(),
  59             'board_locations': self.export_board_locations(),
  60         }
  61
  62     @classmethod
  63     def import_locations(cls, locations_definition):
  64         return [
  65             LocationCard.import_location(definition)
  66             for definition in locations_definition]
  67
  68     def export_board_locations(self):
  69         return dict(
  70             (position, location.export())
  71             for position, location in self.board_locations.iteritems())
  72
  73     @classmethod
  74     def import_board_locations(cls, board_locations_definition):
  75         return dict(
  76             (position, LocationCard.import_location(definition))
  77             for position, definition in board_locations_definition.iteritems())
  78
  79     @classmethod
  80     def generate_board(cls, locations_definition):
  81         board_locations = {}
  82         for x in range(5):
  83             for y in range(5):
  84                 board_location = LocationCard.new_location(
  85                     choice(locations_definition).copy())
  86                 board_locations[(x, y)] = board_location.export()
  87         return board_locations
  88
  89     def lose_health(self):
  90         self.health -= 1
  91         if self.health <= 0:
  92             self.end_game(win=False)
  93
  94     def gain_health(self):
  95         if self.health < self.max_health:
  96             self.health += 1
  97
  98     def acquire_win_token(self):
  99         self.wins += 1
 100         if self.wins >= self.wins_required:
 101             self.end_game(win=True)
 102
 103     def replace_card(self, position):
 104         location = LocationCard.new_location(choice(self.locations).copy())
 105         self.board_locations[position] = location
 106
 107     def change_mode(self, new_mode):
 108         """Advance to the next mode"""
 109         if new_mode == self.player_mode:
 110             raise RuntimeError("Inconsistent state. Setting mode %s to itself"
 111                                % self.player_mode)
 112         elif new_mode in (MOVE, ACT, EXAMINE):
 113             self.player_mode = new_mode
 114         else:
 115             raise RuntimeError("Illegal player mode %s" % self.player_mode)
 116
 117     def end_game(self, win):
 118         # TODO: Find a way to not have UI stuff in game logic stuff.
 119         from naja.events import SceneChangeEvent
 120         from naja.scenes.lose import LoseScene
 121         from naja.scenes.win import WinScene
 122         if win:
 123             SceneChangeEvent.post(WinScene)
 124         else:
 125             SceneChangeEvent.post(LoseScene)
 126
 127
 128 class LocationCard(object):
 129     """
 130     A particular set of options available on a location.
 131     """
 132
 133     def __init__(self, bitwise_operand, location_actions):
 134         self.bitwise_operand = bitwise_operand
 135         self.actions = location_actions
 136         self.check_actions()
 137
 138     @classmethod
 139     def import_location(cls, state):
 140         location_actions = [
 141             cls.build_action(definition) for definition in state['actions']]
 142         return cls(state['bitwise_operand'], location_actions)
 143
 144     @classmethod
 145     def build_action(cls, definition):
 146         action_class = getattr(actions, definition['action_class'])
 147         required_bits = definition['required_bits']
 148         data = definition.get('data', {})
 149         return action_class(required_bits, **data)
 150
 151     @classmethod
 152     def new_location(cls, definition):
 153         return cls.import_location({
 154             'bitwise_operand': cls.generate_bitwise_operand(),
 155             'actions': definition['actions'],
 156         })
 157
 158     def export(self):
 159         return {
 160             'bitwise_operand': self.bitwise_operand,
 161             'actions': [action.export() for action in self.actions],
 162         }
 163
 164     def check_actions(self):
 165         if not self.actions:
 166             print "Warning: Location has no actions."
 167             self.insert_default_default_action()
 168         if self.actions[0].required_bits:
 169             self.insert_default_default_action()
 170
 171     def insert_default_default_action(self):
 172         self.actions.insert(0, self.build_action({
 173             'action_class': 'DoNothing',
 174             'required_bits': [],
 175         }))
 176
 177     @staticmethod
 178     def generate_bitwise_operand():
 179         """
 180         Generate a set of two or three bits. At least one direction and one
 181         condition bit will be included. There is a low probability of choosing
 182         a third bit from the complete set.
 183         """
 184         bits = set()
 185         bits.add(choice(DIRECTION_BITS.values()))
 186         bits.add(choice(CONDITION_BITS.values()))
 187         # One in three chance of adding a third bit, with a further one in four
 188         # chance that it will match a bit already chosen.
 189         if choice(range(3)) == 0:
 190             bits.add(choice(BITS.values()))
 191         return frozenset(bits)