from abc import ABC, abstractmethod
from model import Maze, Cell

class MazeBuilder(ABC):
    @abstractmethod
    def buildFromFile(self, filename):
        pass

class TextFileMazeBuilder(MazeBuilder):
    def buildFromFile(self, filename):
        with open(
                filename,
                "r",
                encoding="utf-8"
        ) as file:
            lines = [
                line.rstrip("\n")
                for line in file
            ]
        height = len(lines)
        width = len(lines[0])
        maze = Maze(
            width,
            height
        )
        start_count = 0
        exit_count = 0
        for x, line in enumerate(lines):
            row = []
            for y, symbol in enumerate(line):
                if symbol == "#":
                    cell = Cell(
                        x,
                        y,
                        is_wall=True
                    )
                elif symbol == "S":
                    cell = Cell(
                        x,
                        y,
                        is_start=True
                    )
                    start_count += 1
                elif symbol == "E":
                    cell = Cell(
                        x,
                        y,
                        is_exit=True
                    )
                    exit_count += 1
                elif symbol == " ":
                    cell = Cell(
                        x,
                        y
                    )
                else:
                    raise ValueError(
                        f"Неизвестный символ: {symbol}"
                    )
                row.append(cell)
            maze.add_row(row)
        if start_count != 1:
            raise ValueError(
                "Должен быть ровно один старт S"
            )
        if exit_count != 1:
            raise ValueError(
                "Должен быть ровно один выход E"
            )
        return maze