codingame/bender.py

import sys
import math
from enum import Enum


class Coordinate:
    def __init__(self, r, c):
        self.r = r
        self.c = c

    def __str__(self):
        return str((self.r, self.c))


class Direction(Enum):
    SOUTH = 1
    EAST = 2
    NORTH = 3
    WEST = 4


class Game:
    def __init__(self, city_map):
        self.city_map = city_map
        self.bender = Bender(self.city_map)

    def run(self):
        while self.bender.alive:
            self.bender.step()


class Bender:
    def __init__(self, city_map, position=None):
        self.direction = Direction.SOUTH
        self._position = position
        self.fury = False
        self.alive = True
        self.city_map = city_map
        self.invert = False
        self.instructions = []

        if not self.position:
            for i, r in enumerate(self.city_map):
                if '@' in r:
                    r, c = i, ''.join(r).find('@')
                    self.position = Coordinate(r, c)
    @property
    def position(self):
        return self._position

    @position.setter
    def position(self, value):
        self._position = value
        # self.print_map()

    def print_map(self, file=sys.stderr):
        for r, row in enumerate(self.city_map):
            if r != self.position.r:
                line = ''.join(row)
            else:
                line = ''.join(row[:self.position.c]) + '*' + ''.join(row[self.position.c+1:])
            print(line, file=file)

    def step(self):
        next_item = self.get_next_item()

        if next_item == '#' or (next_item == 'X' and not self.fury):
            self.bypass_obstacle()
            self.step()
        else:
            self.step_forward()

            if next_item == 'X' and self.fury:
                self.city_map[self.position.r][self.position.c] = ' '

            elif next_item == 'B':
                self.fury = not self.fury

            elif next_item == 'T':
                self.beam_me_up()

            elif next_item == 'I':
                self.invert = not self.invert

            elif next_item == 'S':
                self.direction = Direction.SOUTH

            elif next_item == 'E':
                self.direction = Direction.EAST

            elif next_item == 'N':
                self.direction = Direction.NORTH

            elif next_item == 'W':
                self.direction = Direction.WEST

            elif next_item == '$':
                self.alive = False
                for instruction in self.instructions:
                    print(instruction)

            self.check_loop()

    def check_loop(self):
        if len(self.instructions) > 1000:
            print('LOOP')
            self.alive = False

    def beam_me_up(self):
        b_r, b_c = self.position.r, self.position.c

        for i, row in enumerate(self.city_map):
            if 'T' in row:
                t_r, t_c = i, ''.join(row).find('T')
                if t_r != b_r or t_c != b_c:
                    self.position = Coordinate(t_r, t_c)
                    return

    def bypass_obstacle(self):
        if not self.invert:
            self.direction = Direction.SOUTH
            if not self.is_obstacle(self.get_next_item()):
                return

            self.direction = Direction.EAST
            if not self.is_obstacle(self.get_next_item()):
                return

            self.direction = Direction.NORTH
            if not self.is_obstacle(self.get_next_item()):
                return

            self.direction = Direction.WEST
            if not self.is_obstacle(self.get_next_item()):
                return

        else:
            self.direction = Direction.WEST
            if not self.is_obstacle(self.get_next_item()):
                return

            self.direction = Direction.NORTH
            if not self.is_obstacle(self.get_next_item()):
                return

            self.direction = Direction.EAST
            if not self.is_obstacle(self.get_next_item()):
                return

            self.direction = Direction.SOUTH
            if not self.is_obstacle(self.get_next_item()):
                return

    def step_forward(self):
        if self.direction == Direction.SOUTH:
            self.position.r += 1
            self.instructions.append('SOUTH')
        elif self.direction == Direction.NORTH:
            self.position.r -= 1
            self.instructions.append('NORTH')
        elif self.direction == Direction.EAST:
            self.position.c += 1
            self.instructions.append('EAST')
        elif self.direction == Direction.WEST:
            self.position.c -= 1
            self.instructions.append('WEST')

        # self.print_map()

    def get_next_item(self):
        if self.direction == Direction.SOUTH:
            return self.city_map[self.position.r + 1][self.position.c]
        elif self.direction == Direction.NORTH:
            return self.city_map[self.position.r - 1][self.position.c]
        elif self.direction == Direction.EAST:
            return self.city_map[self.position.r][self.position.c + 1]
        elif self.direction == Direction.WEST:
            return self.city_map[self.position.r][self.position.c - 1]

    def is_obstacle(self, next_item):
        if self.fury:
            return next_item == '#'
        else:
            return next_item == '#' or next_item == 'X'


def main():
    l, c = [int(i) for i in input().split()]
    city_map = []
    for i in range(l):
        city_map.append(list(input()))

    game = Game(city_map)
    game.run()


if __name__ == '__main__':
    main()