import queue
from os import path

class Maze:
    def __init__(self):
        self.maze = []
        self.moves = ""
        



    
    def loadMaze(self):
        maze_folder = path.dirname(__file__)
        with open(path.join(maze_folder, 'map.txt'), 'rt') as f:
            for line in f:
                self.maze.append(line)
        return self.maze

    def printMaze(self, maze, path=""):
        for x, pos in enumerate(maze[0]):
            if pos == "A":
                start = x
        
        i = start
        j = 0
        pos = set()
        for move in path:
            if move == "L":
                i -= 1

            elif move == "R":
                i += 1

            elif move == "U":
                j -= 1

            elif move == "D":
                j += 1
            pos.add((j,i))

        for j, row in enumerate(maze):
            for i, col in enumerate(row):
                if (j, i) in pos:
                    print("+ ", end="")
                else:
                    print(col + " ", end="")
            print()

    def valid(self, maze, moves):
        for x, pos in enumerate(maze[0]):
            if pos == "A":
                start = x

        i = start
        j = 0
        for move in moves:
            if move == "L":
                i -= 1

            elif move == "R":
                i += 1

            elif move == "U":
                j -= 1

            elif move == "D":
                j += 1

            if not(0 <= i < len(maze[0]) and 0 <= j < len(maze)):
                return False
            

        return True
    
    def findEnd(self, maze, moves):
        for x, pos in enumerate(maze[0]):
            if pos == "A":
                start = x

        i = start
        j = 0
        for move in moves:
            if move == "L":
                i -= 1

            elif move == "R":
                i += 1

            elif move == "U":
                j -= 1

            elif move == "D":
                j += 1

        if maze[j][i] == "2":
            print("Found: " + moves)
            self.moves = moves
            self.printMaze(maze, moves)
            return True

        return False

    def run(self):
        nums = queue.Queue()
        nums.put("")
        add = ""
        self.loadMaze()

        while not self.findEnd(self.maze, add):
            add = nums.get()
            for j in ["L", "R", "U", "D"]:
                put = add + j
                if self.valid(self.maze, put):
                    nums.put(put)