"""python3 sudoku.py http://localhost:3000 — standard library only.

newGame() -> Game; game.board[y][x]; game.move(x, y, n) -> Game.
x = column, y = row (0–8); n = value (1–9).
"""
import json
import sys
from urllib.error import HTTPError
from urllib.parse import quote
from urllib.request import Request, urlopen


class ApiError(Exception):
    def __init__(self, status, details):
        self.status, self.details = status, details
        super().__init__(f"HTTP {status}: {details}")


def request(base_url, path, method="GET", body=None):
    req = Request(
        base_url.rstrip("/") + path,
        data=None if body is None else json.dumps(body).encode(),
        headers={"Content-Type": "application/json"},
        method=method,
    )
    try:
        with urlopen(req, timeout=10) as response:
            return json.load(response)
    except HTTPError as error:
        details = error.read().decode()
        try:
            details = json.loads(details)
        except ValueError:
            pass
        raise ApiError(error.code, details) from error


class Game:
    def __init__(self, game_id, board, base_url):
        self.id, self.board, self.base_url = game_id, board, base_url

    def move(self, x, y, n):
        if (any(type(v) is not int for v in (x, y, n))
                or not 0 <= x <= 8 or not 0 <= y <= 8 or not 1 <= n <= 9):
            raise ValueError("x and y must be 0–8; n must be 1–9")
        data = request(self.base_url, f"/board/{quote(self.id, safe='')}/turn", "PATCH",
                       {"row": y, "col": x, "value": n})
        self.board = data["board"]
        return self


def newGame(base_url="http://localhost:3000"):
    game_id = request(base_url, "/board", "POST")["id"]
    data = request(base_url, f"/board/{quote(game_id, safe='')}")
    return Game(game_id, data["board"], base_url)


if __name__ == "__main__":
    game = newGame(sys.argv[1] if len(sys.argv) > 1 else "http://localhost:3000")
    game = game.move(2, 1, 5)
    print(json.dumps(game.board))