from abc import ABC, abstractmethod

from cell import Cell
from maze import Maze


class MazeBuilder(ABC):

    @abstractmethod
    def build_from_file(self, filename: str) -> Maze:
        pass


class TextFileMazeBuilder(MazeBuilder):

    def build_from_file(self, filename: str) -> Maze:

        with open(filename, "r", encoding="utf-8") as file:
            lines = [line.rstrip("\n") for line in file]

        cells = []

        start = None
        exit = None

        for y, line in enumerate(lines):

            row = []

            for x, char in enumerate(line):

                is_wall = char == "#"
                is_start = char == "S"
                is_exit = char == "E"

                cell = Cell(
                    x=x,
                    y=y,
                    is_wall=is_wall,
                    is_start=is_start,
                    is_exit=is_exit
                )

                if is_start:
                    start = cell

                if is_exit:
                    exit = cell

                row.append(cell)

            cells.append(row)

        if start is None:
            raise ValueError("Старт S не найден")

        if exit is None:
            raise ValueError("Выход E не найден")

        return Maze(cells, start, exit)