naja/gameboard.py

   1 from random import choice
   2
   3 from naja.constants import(
   4     BITS, DIRECTION_BITS, CONDITION_BITS, PLAYER_DEFAULTS,
   5     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 = EXAMINE
  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 shift_locations(self, direction):
 108         px, py = self.player.position
 109         shifted_locations = {}
 110         # TODO: Make this less horrible. Also test it.
 111         if BITS[direction] == BITS.NORTH:
 112             for y in range(5):
 113                 if y == py:
 114                     continue
 115                 new_y = y - 1
 116                 if new_y == py:
 117                     new_y -= 1
 118                 new_y %= 5
 119                 shifted_locations[(px, new_y)] = self.board_locations[(px, y)]
 120         elif BITS[direction] == BITS.SOUTH:
 121             for y in range(5):
 122                 if y == py:
 123                     continue
 124                 new_y = y + 1
 125                 if new_y == py:
 126                     new_y += 1
 127                 new_y %= 5
 128                 shifted_locations[(px, new_y)] = self.board_locations[(px, y)]
 129         elif BITS[direction] == BITS.EAST:
 130             for x in range(5):
 131                 if x == px:
 132                     continue
 133                 new_x = x + 1
 134                 if new_x == px:
 135                     new_x += 1
 136                 new_x %= 5
 137                 shifted_locations[(new_x, py)] = self.board_locations[(x, py)]
 138         elif BITS[direction] == BITS.WEST:
 139             for x in range(5):
 140                 if x == px:
 141                     continue
 142                 new_x = x - 1
 143                 if new_x == px:
 144                     new_x -= 1
 145                 new_x %= 5
 146                 shifted_locations[(new_x, py)] = self.board_locations[(x, py)]
 147
 148         self.board_locations.update(shifted_locations)
 149
 150     def change_mode(self, new_mode):
 151         """Advance to the next mode"""
 152         if new_mode == self.player_mode:
 153             raise RuntimeError("Inconsistent state. Setting mode %s to itself"
 154                                % self.player_mode)
 155         elif new_mode in (ACT, EXAMINE):
 156             self.player_mode = new_mode
 157         else:
 158             raise RuntimeError("Illegal player mode %s" % self.player_mode)
 159
 160     def end_game(self, win):
 161         # TODO: Find a way to not have UI stuff in game logic stuff.
 162         from naja.events import SceneChangeEvent
 163         from naja.scenes.lose import LoseScene
 164         from naja.scenes.win import WinScene
 165         if win:
 166             SceneChangeEvent.post(WinScene)
 167         else:
 168             SceneChangeEvent.post(LoseScene)
 169
 170
 171 class LocationCard(object):
 172     """
 173     A particular set of options available on a location.
 174     """
 175
 176     def __init__(self, bitwise_operand, location_actions):
 177         self.bitwise_operand = bitwise_operand
 178         self.actions = location_actions
 179         self.check_actions()
 180
 181     @classmethod
 182     def import_location(cls, state):
 183         location_actions = [
 184             cls.build_action(definition) for definition in state['actions']]
 185         return cls(state['bitwise_operand'], location_actions)
 186
 187     @classmethod
 188     def build_action(cls, definition):
 189         action_class = getattr(actions, definition['action_class'])
 190         required_bits = definition['required_bits']
 191         data = definition.get('data', {})
 192         return action_class(required_bits, **data)
 193
 194     @classmethod
 195     def new_location(cls, definition):
 196         return cls.import_location({
 197             'bitwise_operand': cls.generate_bitwise_operand(),
 198             'actions': definition['actions'],
 199         })
 200
 201     def export(self):
 202         return {
 203             'bitwise_operand': self.bitwise_operand,
 204             'actions': [action.export() for action in self.actions],
 205         }
 206
 207     def check_actions(self):
 208         if not self.actions:
 209             print "Warning: Location has no actions."
 210             self.insert_default_default_action()
 211         if self.actions[0].required_bits:
 212             self.insert_default_default_action()
 213
 214     def insert_default_default_action(self):
 215         self.actions.insert(0, self.build_action({
 216             'action_class': 'DoNothing',
 217             'required_bits': [],
 218         }))
 219
 220     @staticmethod
 221     def generate_bitwise_operand():
 222         """
 223         Generate a set of two or three bits. At least one direction and one
 224         condition bit will be included. There is a low probability of choosing
 225         a third bit from the complete set.
 226         """
 227         bits = set()
 228         bits.add(choice(DIRECTION_BITS.values()))
 229         bits.add(choice(CONDITION_BITS.values()))
 230         # One in three chance of adding a third bit, with a further one in four
 231         # chance that it will match a bit already chosen.
 232         if choice(range(3)) == 0:
 233             bits.add(choice(BITS.values()))
 234         return frozenset(bits)