|
| 1 | +""" |
| 2 | +:authors: cmdtorch |
| 3 | +:license: MIT, see LICENSE file |
| 4 | +
|
| 5 | +:copyright: (c) 2023 cmdtorch |
| 6 | +""" |
| 7 | + |
| 8 | +from dataclasses import dataclass |
| 9 | +from typing import Tuple, Optional, List |
| 10 | +from .player import Player |
| 11 | +from .exceptions import NardError |
| 12 | + |
| 13 | + |
| 14 | +@dataclass |
| 15 | +class Move: |
| 16 | + """ |
| 17 | + Move class for Nard game |
| 18 | + """ |
| 19 | + source: int |
| 20 | + direction: Optional[int] = None |
| 21 | + |
| 22 | + def __repr__(self): |
| 23 | + return f'[from: {self.source}, to: {self.direction}' |
| 24 | + |
| 25 | + |
| 26 | +class Board: |
| 27 | + """ |
| 28 | + Board for Nard game |
| 29 | + """ |
| 30 | + |
| 31 | + def __init__(self): |
| 32 | + self.slots: Tuple[int, ...] = self._generate_slots() |
| 33 | + self._white_off: int = 0 |
| 34 | + self._black_off: int = 0 |
| 35 | + |
| 36 | + @property |
| 37 | + def white_off(self) -> int: |
| 38 | + """ |
| 39 | + Number of white checkers offed from the board |
| 40 | + :return: number of checkers |
| 41 | + """ |
| 42 | + return self._white_off |
| 43 | + |
| 44 | + @property |
| 45 | + def black_off(self) -> int: |
| 46 | + """ |
| 47 | + Number of black checkers offed from the board |
| 48 | + :return: number of checkers |
| 49 | + """ |
| 50 | + return self._black_off |
| 51 | + |
| 52 | + def add_move(self, player: Player, move: Move) -> Tuple[int, ...]: |
| 53 | + """ |
| 54 | + Apply move on the board |
| 55 | + :param player: the player who played |
| 56 | + :param move: move for apply |
| 57 | + :return: new state of slots |
| 58 | + """ |
| 59 | + slots = list(self.player_pov_slots(player)) |
| 60 | + slots[move.source] = slots[move.source] + (1 if player == Player.BLACK else -1) |
| 61 | + if move.direction: |
| 62 | + slots[move.direction] = slots[move.direction] + (-1 if player == Player.BLACK else 1) |
| 63 | + else: |
| 64 | + if player == Player.WHITE: |
| 65 | + self._white_off += 1 |
| 66 | + else: |
| 67 | + self._black_off += 1 |
| 68 | + |
| 69 | + self._set_new_slots(player, slots) |
| 70 | + return self.slots |
| 71 | + |
| 72 | + def off(self, player: Player, source: int) -> None: |
| 73 | + """ |
| 74 | + Off checker from the board |
| 75 | + :param player: the player who played |
| 76 | + :param source: source of checker |
| 77 | + :return: None |
| 78 | + """ |
| 79 | + if not self.is_off_possible(player): |
| 80 | + raise NardError('There are checkers that are not at home') |
| 81 | + |
| 82 | + slots = list(self.player_pov_slots(player)) |
| 83 | + slots[source] = slots[source] + (1 if player == Player.BLACK else -1) |
| 84 | + if player == Player.WHITE: |
| 85 | + self._white_off += 1 |
| 86 | + else: |
| 87 | + self._black_off += 1 |
| 88 | + |
| 89 | + self._set_new_slots(player, slots) |
| 90 | + # distance = 24 - source |
| 91 | + |
| 92 | + def get_valid_moves(self, player: Player, dices: Tuple[int]) -> Optional[List[Move]]: |
| 93 | + """ |
| 94 | + Get list of valid moves. |
| 95 | + :param player: the player who played |
| 96 | + :param dices: dice number for move |
| 97 | + :return: list of valid moves |
| 98 | + """ |
| 99 | + |
| 100 | + def player_piece_value(): |
| 101 | + return 1 if player == Player.BLACK else -1 |
| 102 | + |
| 103 | + def is_unacceptable_mars(slots, source: int, direction: int) -> bool: |
| 104 | + slots_after_move = list(slots) |
| 105 | + slots_after_move[source] = slots_after_move[source] + player_piece_value() |
| 106 | + slots_after_move[direction] = slots_after_move[direction] + player_piece_value() |
| 107 | + slots_after_move_handler = [1 if s > 0 else -1 if s < 0 else 0 |
| 108 | + for s in slots_after_move] |
| 109 | + opponent_value = -1 if Player.WHITE == player else 1 |
| 110 | + |
| 111 | + checkers_in_row = 0 |
| 112 | + for i, s in enumerate(slots_after_move_handler): |
| 113 | + if player.WHITE and s > 0 or player.BLACK and s < 0: |
| 114 | + checkers_in_row += 1 |
| 115 | + if checkers_in_row < 6: |
| 116 | + continue |
| 117 | + if i <= 12 and opponent_value not in slots_after_move_handler[0:13] or \ |
| 118 | + i >= 13 and opponent_value not in slots_after_move_handler[14:24] and\ |
| 119 | + -1 not in slots_after_move_handler[0:13]: |
| 120 | + return True |
| 121 | + else: |
| 122 | + checkers_in_row = 0 |
| 123 | + |
| 124 | + return False |
| 125 | + |
| 126 | + player_view_slots = self.player_pov_slots(player) |
| 127 | + # CHECK FOR MOVE CHECKERS |
| 128 | + moves = [] |
| 129 | + for index, slot in enumerate(player_view_slots): |
| 130 | + if not self.is_player_cell(player, slot): |
| 131 | + continue |
| 132 | + for dice in dices: |
| 133 | + try: |
| 134 | + direction = index + dice |
| 135 | + moved_slot = player_view_slots[direction] |
| 136 | + if moved_slot != 0 and not self.is_player_cell(player, moved_slot): |
| 137 | + continue |
| 138 | + if not is_unacceptable_mars(player_view_slots, index, direction): |
| 139 | + moves.append(Move(index, direction)) |
| 140 | + except IndexError: |
| 141 | + pass |
| 142 | + |
| 143 | + # CHECK FOR OFF CHECKERS |
| 144 | + if not self.is_off_possible(player): |
| 145 | + return moves |
| 146 | + |
| 147 | + off_moves = [] |
| 148 | + home = list(player_view_slots[18:24]) |
| 149 | + for index, slot in enumerate(home): |
| 150 | + if not self.is_player_cell(player, slot): |
| 151 | + continue |
| 152 | + |
| 153 | + for dice in dices: |
| 154 | + if 6 - index == dice: |
| 155 | + off_moves.append(Move(index + 18, None)) |
| 156 | + elif not moves: |
| 157 | + off_moves.append(Move(index + 18, None)) |
| 158 | + |
| 159 | + if off_moves: |
| 160 | + return off_moves |
| 161 | + return moves |
| 162 | + |
| 163 | + def is_off_possible(self, player: Player) -> bool: |
| 164 | + """ |
| 165 | + Checking whether a player can off his checkers |
| 166 | + :param player: the player for check |
| 167 | + :return: `True` or `False` |
| 168 | + """ |
| 169 | + slots_exclude_home = list(self.player_pov_slots(player))[0:18] |
| 170 | + match player: |
| 171 | + case Player.WHITE: |
| 172 | + if [cell for cell in slots_exclude_home if cell > 0]: |
| 173 | + return False |
| 174 | + case Player.BLACK: |
| 175 | + if [cell for cell in slots_exclude_home if cell < 0]: |
| 176 | + return False |
| 177 | + return True |
| 178 | + |
| 179 | + def player_pov_slots(self, player: Player) -> Tuple[int, ...]: |
| 180 | + """ |
| 181 | + Slots by the player point of view |
| 182 | + :param player: the player for pov |
| 183 | + :return: slots list |
| 184 | + """ |
| 185 | + if player == Player.BLACK: |
| 186 | + slots = list(self.slots) |
| 187 | + first_half = slots[0:12] |
| 188 | + return tuple(slots[12:24] + first_half) |
| 189 | + return self.slots |
| 190 | + |
| 191 | + def _set_new_slots(self, player: Player, new_slots: List[int]) -> None: |
| 192 | + if player == Player.BLACK: |
| 193 | + first_half = new_slots[0:12] |
| 194 | + new_slots = tuple(new_slots[12:24] + first_half) |
| 195 | + self.slots = tuple(new_slots) |
| 196 | + |
| 197 | + @staticmethod |
| 198 | + def is_player_cell(player: Player, slot: int) -> bool: |
| 199 | + """ |
| 200 | + Check is has player piece in slot |
| 201 | + :param player: player for piece |
| 202 | + :param slot: slot number |
| 203 | + :return: `True` or `False` |
| 204 | + """ |
| 205 | + if slot == 0: |
| 206 | + return False |
| 207 | + |
| 208 | + if player == Player.BLACK and slot < 0 \ |
| 209 | + or player == Player.WHITE and slot > 0: |
| 210 | + return True |
| 211 | + return False |
| 212 | + |
| 213 | + @staticmethod |
| 214 | + def _generate_slots(): |
| 215 | + slots = tuple(15 if i == 0 else |
| 216 | + -15 if i == 12 else 0 for i in range(24)) |
| 217 | + return slots |
| 218 | + |
| 219 | + def __repr__(self): |
| 220 | + return f'Slots: {self.slots} |' \ |
| 221 | + f' White checkers offed: {self.white_off} |' \ |
| 222 | + f' Black checkers offed: {self.black_off}' |
| 223 | + |
| 224 | + |
| 225 | +def get_distance(move: Move) -> int: |
| 226 | + """ |
| 227 | + Delta of move |
| 228 | + :param move: move |
| 229 | + :return: delta |
| 230 | + """ |
| 231 | + if move.direction > move.source: |
| 232 | + return move.direction - move.source |
| 233 | + return (24 - move.source) + move.direction |
0 commit comments