Initial Commit
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280
app.py
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280
app.py
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import asyncio
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import json
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import uuid
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from datetime import datetime
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from enum import Enum
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from itertools import combinations
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from typing import TypedDict
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from slow import JSONAPI, App, JSONResponse, render
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class Coord(TypedDict):
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x: int
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y: int
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app = App()
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class Color(Enum):
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WHITE = 0
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BLACK = 1
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class Piece(Enum):
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NONE = ""
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EMPTY = "E"
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# WHITE
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WHITE_PAWN = "P"
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WHITE_ROOK = "R"
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WHITE_BISHOP = "B"
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WHITE_KING = "K"
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WHITE_QUEEN = "Q"
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WHITE_CASTLE = "C"
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# BLACK
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BLACK_PAWN = "p"
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BLACK_ROOK = "r"
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BLACK_BISHOP = "b"
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BLACK_KING = "k"
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BLACK_QUEEN = "q"
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BLACK_CASTLE = "c"
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def xy_to_coord(xy: Coord) -> None | str:
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if xy.x < 0 or xy.x > 7 or xy.y < 0 or xy.y > 7:
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return None
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return "abcdefgh"[xy.x] + "12345678"[xy.y]
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def coord_to_xy(pos: str) -> tuple[int, int]:
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return ("abcdefgh".inedx(pos[0]), "12345678".inedx(pos[1]))
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class Board:
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grid: list[list[Piece]]
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def __init__(self):
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self.grid = [[Piece.EMPTY] * 8] * 8
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self.grid[0] = [
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Piece.WHITE_CASTLE,
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Piece.WHITE_ROOK,
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Piece.WHITE_BISHOP,
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Piece.WHITE_KING,
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Piece.WHITE_QUEEN,
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Piece.WHITE_BISHOP,
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Piece.WHITE_ROOK,
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Piece.WHITE_CASTLE,
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]
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self.grid[1] = [Piece.WHITE_PAWN] * 8
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self.grid[6] = [Piece.BLACK_PAWN] * 8
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self.grid[7] = [
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Piece.BLACK_CASTLE,
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Piece.BLACK_ROOK,
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Piece.BLACK_BISHOP,
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Piece.BLACK_KING,
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Piece.BLACK_QUEEN,
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Piece.BLACK_BISHOP,
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Piece.BLACK_ROOK,
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Piece.BLACK_CASTLE,
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]
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def index(self, pos: str) -> Piece:
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let = "abcdefgh".index(pos[0])
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num = "12345678".index(pos[1])
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return self.grid[num][let]
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def index_xy(self, xy: Coord) -> Piece:
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if xy.x < 0 or xy.x > 7 or xy.y < 0 or xy.y > 7:
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return Piece.NONE
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return self.grid[xy.y][xy.x]
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def serialize(self) -> dict:
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return {"grid": self.grid}
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class Room:
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board: Board = Board()
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turn: Color = Color.WHITE
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players: list[uuid.UUID] = []
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last_move: datetime
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def start(self):
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self.last_move = datetime.now()
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def add_player(self) -> None | tuple[uuid.UUID, Color]:
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np: int = len(self.players)
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if np >= 2:
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return None
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elif np == 1:
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uid = uuid.uuid4()
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self.players.append(uid)
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return uid, Color.BLACK
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else:
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uid = uuid.uuid4()
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self.players.append(uid)
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return uid, Color.WHITE
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rooms: dict[str, Room] = {}
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@app.GET("/")
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async def home(request):
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return render("index.html")
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@app.POST("/join/<id>")
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async def join(request, room_id):
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room: Room = rooms.get(room_id, Room())
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player = room.add_player()
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if player:
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return JSONResponse(
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{
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"code": "JOIN",
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"id": player[0],
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"color": player[1],
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"board": room.board.serialize(),
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}
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)
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else:
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return JSONResponse(
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{"code": "FULL", "error": "Room Full", "board": room.board.serialize()}
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)
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def parse(body: str) -> dict | None:
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try:
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return json.loads(body)
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except Exception:
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return None
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@app.POST("/move/<id>")
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@JSONAPI
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async def move(request, room_id):
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req = parse(request.body)
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if not req:
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return 400, {}
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if "uid" not in req or not isinstance(req["uid"], str):
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return 400, {}
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if "from" not in req or not isinstance(req["from"], str):
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return 400, {}
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if "to" not in req or not isinstance(req["to"], str):
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return 400, {}
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if room_id not in rooms:
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return 400, {"code": "NOEX", "error": "Room does not exist"}
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room = rooms[room_id]
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if len(room.players) != 2:
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return 400, {"code": "PRES", "error": "Game has not been started"}
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board = room.board
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uid = req["uid"]
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src = req["from"].lower()
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dst = req["to"].lower()
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color = Color.WHITE if room.players[0] == uid else Color.BLACK
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turn = room.turn == color
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if not turn:
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return 400, {"code": "OTHR", "error": "Not your turn."}
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if (
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len(src) != 2
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or len(dst) != 2
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or src[0] not in "abcdefgh"
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or src[1] not in "12345678"
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or dst[0] not in "abcdefgh"
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or dst[1] not in "12345678"
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or board.index(src) != Piece.EMPTY
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):
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return 400, {"code": "LMOV", "error": "Bad Move"}
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srcp = board.index(src)
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dstp = board.index(dst)
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piece_kind = srcp.value.lower()
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is_white = srcp.value.isupper()
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if (is_white and color == Color.BLACK) or (not is_white and color == Color.WHITE):
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return 400, {"code": "NOTU", "error": "Not your piece"}
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if dstp != Piece.EMPTY and (
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(dstp.value.isupper() and color == Color.WHITE)
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or (dstp.value.islower() and color == Color.BLACK)
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):
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return 400, {"code": "HTME", "error": "Cannot move to your own piece"}
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valids: list[Coord] = []
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if piece_kind == "p":
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dir = 1 if is_white else -1
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x, y = coord_to_xy(src)
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if board.index_xy(x, y + dir) == Piece.EMPTY:
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valids.append({"x": x, "y": y + dir})
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if (y == 1 or y == 6) and board.index_xy(x, y + 2 * dir) == Piece.EMPTY:
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valids.append({"x": x, "y": y + 2 * dir})
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if (
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board.index_xy(x + 1, y + dir)
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not in [Piece.EMPTY, Piece.NONE, Piece.BLACK_KING, Piece.WHITE_KING]
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and board.index_xy(x + 1, y + dir).value.upper() != is_white
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):
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valids.append({"x": x + 1, "y": y + 1})
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if (
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board.index_xy(x - 1, y + dir)
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not in [Piece.EMPTY, Piece.NONE, Piece.BLACK_KING, Piece.WHITE_KING]
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and board.index_xy(x - 1, y + dir).value.upper() != is_white
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):
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valids.append({"x": x - 1, "y": y + 1})
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if piece_kind == "b":
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x, y = coord_to_xy(src)
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comb = combinations([1, -1], 2)
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for dir in comb:
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scl = 1
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target: Coord = {"x": x + dir[0] * scl, "y": y + dir[1] * scl}
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while board.index_xy(target) not in [Piece.EMPTY, Piece.NONE]:
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valids.append(target.copy())
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scl += 1
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target: Coord = {"x": x + dir[0] * scl, "y": y + dir[1] * scl}
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if (
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p := board.index_xy(target)
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) != Piece.NONE and p.value.isupper() != is_white:
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valids.append(target.copy())
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if piece_kind == "q":
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x, y = coord_to_xy(src)
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comb = combinations([1, -1, 0], 2)
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for dir in comb:
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if dir[0] ** 2 + dir[1] ** 2 == 0:
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continue # x=0 y=0 cannot move => invalid
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scl = 1
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target: Coord = {"x": x + dir[0] * scl, "y": y + dir[1] * scl}
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while board.index_xy(target) not in [Piece.EMPTY, Piece.NONE]:
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valids.append(target.copy())
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scl += 1
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target: Coord = {"x": x + dir[0] * scl, "y": y + dir[1] * scl}
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if (
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p := board.index_xy(target)
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) != Piece.NONE and p.value.isupper() != is_white:
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valids.append(target.copy())
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if piece_kind == "c":
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x, y = coord_to_xy(src)
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comb = [(-1, 0), (1, 0), (0, -1), (0, 1)]
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for dir in comb:
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scl = 1
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target: Coord = {"x": x + dir[0] * scl, "y": y + dir[1] * scl}
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while board.index_xy(target) not in [Piece.EMPTY, Piece.NONE]:
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valids.append(target.copy())
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scl += 1
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target: Coord = {"x": x + dir[0] * scl, "y": y + dir[1] * scl}
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if (
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p := board.index_xy(target)
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) != Piece.NONE and p.value.isupper() != is_white:
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valids.append(target.copy())
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if piece_kind == "k":
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x, y = coord_to_xy(src)
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comb = combinations([-1, 0, 1], 2)
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for dir in comb:
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if dir[0] ** 2 + dir[1] ** 2 == 0:
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continue # x=0 y=0 cannot move => invalid
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target: Coord = {"x": x + dir[0], "y": y + dir[1]}
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if (
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p := board.index_xy(target)
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) != Piece.NONE and p.value.isupper() != is_white:
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valids.append(target.copy())
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if __name__ == "__main__":
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asyncio.run(app.run(port=8080))
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