#!/usr/bin/env python
# coding: utf-8

# In[ ]:


from collections import deque
from typing import List, Dict, Optional
from strategiesPathfinding_strategy import PathFindingStrategy
from modelsMaze import Maze
from modelsCell import Cell

class BFSStrategy(PathFindingStrategy):
    """Поиск в ширину - гарантирует кратчайший путь."""

    @property
    def name(self) -> str:
        return "BFS"

    def find_path(self, maze: Maze, start: Cell, exit_cell: Cell) -> List[Cell]:
        if start == exit_cell:
            return [start]

        queue = deque([start])
        came_from: Dict[Cell, Optional[Cell]] = {start: None}
        visited_count = 0  # Для статистики

        while queue:
            current = queue.popleft()
            visited_count += 1

            if current == exit_cell:
                # Сохраняем количество посещённых клеток для статистики
                self._last_visited_count = visited_count
                return self._reconstruct_path(came_from, start, current)

            for neighbor in maze.get_neighbors(current):
                if neighbor not in came_from:
                    came_from[neighbor] = current
                    queue.append(neighbor)

        self._last_visited_count = visited_count
        return []

    @property
    def last_visited_count(self) -> int:
        return getattr(self, '_last_visited_count', 0)