from random import choice, randrange

from coords import Coords


def maze_gen(row=4, col=4):
    """генератор карты
    взял с коментария
    https://stepik.org/lesson/502494/step/3?discussion=6527620&unit=494196
    """
    row = max(2 * row + 1, 3)
    col = max(2 * col + 1, 3)
    maze = [[2] * col]
    maze.extend([[2] + [1] * (col - 2) + [2] for _ in range(row - 2)])
    maze.append(maze[0])

    curr = (randrange(1, len(maze) - 1, 2), randrange(1, len(maze[0]) - 1, 2))
    path = [curr]
    maze[curr[0]][curr[1]] = 0

    while path:
        nexts = [
            (r1, c1, r2, c2)
            for r, c in zip((1, 0, -1, 0), (0, 1, 0, -1))
            if (
                (r1 := curr[0] + r) is None
                or (c1 := curr[1] + c) is None
                or (r2 := curr[0] + 2 * r) is None
                or (c2 := curr[1] + 2 * c) is None
                or 1 == maze[r1][c1] == maze[r2][c2]
            )
        ]
        if nexts:
            r1, c1, r2, c2 = choice(nexts)
            maze[r1][c1] = maze[r2][c2] = 0
            path.append((r2, c2))
        else:
            curr = path.pop()

    upd = {
        ("22", "20"): (None, "00"),
        ("02", "22"): ("00", None),
        ("11101", "00101", "11111", "10100", "10111"): (
            None,
            None,
            None,
            "10001",
            None,
        ),
        ("10111", "10100", "11111", "00101", "11101"): (
            None,
            "10001",
            None,
            None,
            None,
        ),
    }
    for pattern, replacement in upd.items():
        for i in range(len(maze) - len(pattern) + 1):
            for j in range(len(maze[0]) - len(pattern[0]) + 1):
                if all(
                    maze[i + k][j : j + len(v)] == list(map(int, v))
                    for k, v in enumerate(pattern)
                ):
                    for k, v in filter(lambda x: x[1], enumerate(replacement)):
                        maze[i + k][j : j + len(v)] = list(map(int, v))

    return maze


def get_maze_sz(maze: list[list[int]]) -> Coords:
    return Coords(len(maze[0]), len(maze))