from typing import List, Optional

from .cell import Cell


class Maze:
    def __init__(self, width: int, height: int):
        self.width = width
        self.height = height
        self.cells = [[Cell(x, y) for x in range(width)] for y in range(height)]
        self.start = None
        self.exit = None

    def get_cell(self, x: int, y: int) -> Optional[Cell]:
        if 0 <= x < self.width and 0 <= y < self.height:
            return self.cells[y][x]
        return None

    def set_cell(self, x: int, y: int, cell_type: str):
        cell = self.get_cell(x, y)
        if cell is None:
            return

        if cell_type == "wall":
            cell.is_wall = True
        elif cell_type == "start":
            if self.start:
                self.start.is_start = False
            cell.is_start = True
            cell.is_wall = False
            self.start = cell
        elif cell_type == "exit":
            if self.exit:
                self.exit.is_exit = False
            cell.is_exit = True
            cell.is_wall = False
            self.exit = cell
        elif cell_type == "path":
            cell.is_wall = False

    def get_neighbors(self, cell: Cell) -> List[Cell]:
        neighbors = []
        directions = [(0, -1), (0, 1), (-1, 0), (1, 0)]
        for dx, dy in directions:
            nx, ny = cell.x + dx, cell.y + dy
            neighbor = self.get_cell(nx, ny)
            if neighbor and neighbor.is_passable():
                neighbors.append(neighbor)
        return neighbors
