special_board = import_special_board()

width = len(special_board)

height = len(special_board[0])

tools.print_board(special_board)

# get list of teleport spots

teleport_list = []

for y in range(len(special_board[0])):

for x in range(len(special_board)):

if special_board[x][y] == 'T':

teleport_list.append(tools.coor_to_string(x, y))

# get input for data. We don't want to start on an element for simplicity.

print "What is the start location?"

valid_start_coor = False

while not valid_start_coor:

start_x_coor, start_y_coor = tools.get_input_coordinates(width, height)

element = special_board[start_x_coor][start_y_coor]

if element == 'W' or element == 'R' or element == 'B' or element == 'T' or element == 'L':

print "Start has element. Enter new start location:"

valid_start_coor = False

else:

valid_start_coor = True

print "What is the end location?"

unique_end_coor = False

while not unique_end_coor:

end_x_coor, end_y_coor = tools.get_input_coordinates(width, height)

element = special_board[end_x_coor][end_y_coor]

if (start_x_coor == end_x_coor) and (start_y_coor == end_y_coor):

print "Same as start. Enter new end location:"

unique_end_coor = False

elif element == 'W' or element == 'R' or element == 'B' or element == 'T' or element == 'L':

print "End has element. Enter new end location:"

unique_end_coor = False

else:

unique_end_coor = True

# mark start/end location

board = [['.' for x in range(height)] for x in range(width)]

board[start_x_coor][start_y_coor] = 'S'

board[end_x_coor][end_y_coor] = 'E'

# initialize board storing moves

board_with_moves = [['.' for x in range(height)] for x in range(width)]

board_with_moves[start_x_coor][start_y_coor] = []

# store number of moves. Important because of our elements

board_with_num_moves = [['.' for x in range(height)] for x in range(width)]

board_with_num_moves[start_x_coor][start_y_coor] = 0

continue_loop = True

current_step = 0

teleport_done = False

while continue_loop:

continue_loop = False

for y in range(len(board[0])):

for x in range(len(board)):

if board_with_moves[x][y] != '.' and board_with_num_moves[x][y] == current_step:

modified = draw_knight_move(board_with_moves, board_with_num_moves, special_board, x, y, current_step + 1, width, height)

if modified:

continue_loop = True

# shortest move found!

if board_with_moves[end_x_coor][end_y_coor] != '.':

move_to_end = board_with_moves[end_x_coor][end_y_coor]

special_board_to_print = [row[:] for row in special_board]

for num_move in range(1, len(move_to_end)):

x, y = tools.string_to_coor(move_to_end[num_move])

special_board_to_print[start_x_coor][start_y_coor] = 'S'

special_board_to_print[end_x_coor][end_y_coor] = 'E'

special_board_to_print[x][y] = board_with_num_moves[x][y]

tools.print_board(special_board_to_print)

print 'Sequence of moves: '

for num_move in range(0, len(move_to_end)):

x, y = tools.string_to_coor(move_to_end[num_move])

print '(' , x, ', ', y, ')'

print '(' , end_x_coor, ', ', end_y_coor, ')'

# we want to check if sequence of moves are all valid

valid_knight_moves = True

for idx in range(1, len(move_to_end)):

prev_x, prev_y = tools.string_to_coor(move_to_end[idx - 1])

x, y = tools.string_to_coor(move_to_end[idx])

if not tools.is_valid_knight_move(prev_x, prev_y, x, y) and move_to_end[idx] not in teleport_list:

print 'Invalid'

valid_knight_moves = False

break

if valid_knight_moves:

print '--- All valid knight moves'

else:

print '--- Invalid knight moves'

exit()

current_step += 1

# check if anything has landed on teleport locations.

# because we care about shortest moves, if we land on one, then move all other moves to teleport.

if not teleport_done:

for teleport_str in teleport_list:

t_x, t_y = tools.string_to_coor(teleport_str)

if board_with_moves[t_x][t_y] != '.':

for teleport_str in teleport_list:

t_x_, t_y_ = tools.string_to_coor(teleport_str)

if board_with_moves[t_x_][t_y_] == '.':

board_with_moves[t_x_][t_y_] = board_with_moves[t_x][t_y][:]

board_with_num_moves[t_x_][t_y_] = board_with_num_moves[t_x][t_y]

f = open('special_board.txt', 'r')

special_board = []

for line in f:

special_board.append([c for c in line.strip()])

modified = False

if (x_coor - 2) >= 0 and (y_coor - 1) >= 0:

val = board[x_coor - 2][y_coor - 1]

element = special_board[x_coor - 2][y_coor - 1]

# if never landed on spot or block element

if val == '.' and element != 'R' and element != 'B':

if (special_board[x_coor][y_coor - 1] != 'B' and special_board[x_coor - 1][y_coor - 1] != 'B') or \

(special_board[x_coor - 1][y_coor] != 'B' and special_board[x_coor - 2][y_coor] != 'B'):

board[x_coor - 2][y_coor - 1] = board[x_coor][y_coor][:] + [tools.coor_to_string(x_coor, y_coor)]

board_with_num_moves[x_coor - 2][y_coor - 1] = step

if element == 'W':

board_with_num_moves[x_coor - 2][y_coor - 1] += 1

elif element == 'L':

board_with_num_moves[x_coor - 2][y_coor - 1] += 4

modified = True

if (x_coor - 2) >= 0 and (y_coor + 1) < height:

val = board[x_coor - 2][y_coor + 1]

element = special_board[x_coor - 2][y_coor + 1]

if val == '.' and element != 'R' and element != 'B':

if (special_board[x_coor][y_coor + 1] != 'B' and special_board[x_coor - 1][y_coor + 1] != 'B') or \

(special_board[x_coor - 1][y_coor] != 'B' and special_board[x_coor - 2][y_coor] != 'B'):

board[x_coor - 2][y_coor + 1] = board[x_coor][y_coor][:] + [tools.coor_to_string(x_coor, y_coor)]

board_with_num_moves[x_coor - 2][y_coor + 1] = step

if element == 'W':

board_with_num_moves[x_coor - 2][y_coor + 1] += 1

elif element == 'L':

board_with_num_moves[x_coor - 2][y_coor + 1] += 4

modified = True

if (x_coor + 2) < width and (y_coor - 1) >= 0:

val = board[x_coor + 2][y_coor - 1]

element = special_board[x_coor + 2][y_coor - 1]

if val == '.' and element != 'R' and element != 'B':

if (special_board[x_coor][y_coor - 1] != 'B' and special_board[x_coor - 1][y_coor - 1] != 'B') or \

(special_board[x_coor + 1][y_coor] != 'B' and special_board[x_coor + 2][y_coor] != 'B'):

board[x_coor + 2][y_coor - 1] = board[x_coor][y_coor][:] + [tools.coor_to_string(x_coor, y_coor)]

board_with_num_moves[x_coor + 2][y_coor - 1] = step

if element == 'W':

board_with_num_moves[x_coor + 2][y_coor - 1] += 1

elif element == 'L':

board_with_num_moves[x_coor + 2][y_coor - 1] += 4

modified = True

if (x_coor + 2) < width and (y_coor + 1) < height:

val = board[x_coor + 2][y_coor + 1]

element = special_board[x_coor + 2][y_coor + 1]

if val == '.' and element != 'R' and element != 'B':

if (special_board[x_coor][y_coor + 1] != 'B' and special_board[x_coor + 1][y_coor + 1] != 'B') or \

(special_board[x_coor + 1][y_coor] != 'B' and special_board[x_coor + 2][y_coor] != 'B'):

board[x_coor + 2][y_coor + 1] = board[x_coor][y_coor][:] + [tools.coor_to_string(x_coor, y_coor)]

board_with_num_moves[x_coor + 2][y_coor + 1] = step

if element == 'W':

board_with_num_moves[x_coor + 2][y_coor + 1] += 1

elif element == 'L':

board_with_num_moves[x_coor + 2][y_coor + 1] += 4

modified = True

if (x_coor - 1) >= 0 and (y_coor - 2) >= 0:

val = board[x_coor - 1][y_coor - 2]

element = special_board[x_coor - 1][y_coor - 2]

if val == '.' and element != 'R' and element != 'B':

if (special_board[x_coor][y_coor - 1] != 'B' and special_board[x_coor][y_coor - 2] != 'B') or \

(special_board[x_coor - 1][y_coor] != 'B' and special_board[x_coor - 1][y_coor - 1] != 'B'):

board[x_coor - 1][y_coor - 2] = board[x_coor][y_coor][:] + [tools.coor_to_string(x_coor, y_coor)]

board_with_num_moves[x_coor - 1][y_coor - 2] = step

if element == 'W':

board_with_num_moves[x_coor - 1][y_coor - 2] += 1

elif element == 'L':

board_with_num_moves[x_coor - 1][y_coor - 2] += 4

modified = True

if (x_coor - 1) >= 0 and (y_coor + 2) < height:

val = board[x_coor - 1][y_coor + 2]

element = special_board[x_coor - 1][y_coor + 2]

if val == '.' and element != 'R' and element != 'B':

if (special_board[x_coor][y_coor + 1] != 'B' and special_board[x_coor][y_coor + 2] != 'B') or \

(special_board[x_coor - 1][y_coor] != 'B' and special_board[x_coor - 1][y_coor + 1] != 'B'):

board[x_coor - 1][y_coor + 2] = board[x_coor][y_coor][:] + [tools.coor_to_string(x_coor, y_coor)]

board_with_num_moves[x_coor - 1][y_coor + 2] = step

if element == 'W':

board_with_num_moves[x_coor - 1][y_coor + 2] += 1

elif element == 'L':

board_with_num_moves[x_coor - 1][y_coor + 2] += 4

modified = True

if (x_coor + 1) < width and (y_coor - 2) >= 0:

val = board[x_coor + 1][y_coor - 2]

element = special_board[x_coor + 1][y_coor - 2]

if val == '.' and element != 'R' and element != 'B':

if (special_board[x_coor][y_coor - 1] != 'B' and special_board[x_coor][y_coor - 2] != 'B') or \

(special_board[x_coor + 1][y_coor] != 'B' and special_board[x_coor + 1][y_coor - 1] != 'B'):

board[x_coor + 1][y_coor - 2] = board[x_coor][y_coor][:] + [tools.coor_to_string(x_coor, y_coor)]

board_with_num_moves[x_coor + 1][y_coor - 2] = step

if element == 'W':

board_with_num_moves[x_coor + 1][y_coor - 2] += 1

elif element == 'L':

board_with_num_moves[x_coor + 1][y_coor - 2] += 4

modified = True

if (x_coor + 1) < width and (y_coor + 2) < height:

val = board[x_coor + 1][y_coor + 2]

element = special_board[x_coor + 1][y_coor + 2]

if val == '.' and element != 'R' and element != 'B':

if (special_board[x_coor][y_coor + 1] != 'B' and special_board[x_coor][y_coor + 2] != 'B') or \

(special_board[x_coor + 1][y_coor] != 'B' and special_board[x_coor + 1][y_coor + 1] != 'B'):

board[x_coor + 1][y_coor + 2] = board[x_coor][y_coor][:] + [tools.coor_to_string(x_coor, y_coor)]

board_with_num_moves[x_coor + 1][y_coor + 2] = step

if element == 'W':

board_with_num_moves[x_coor + 1][y_coor + 2] += 1

elif element == 'L':

board_with_num_moves[x_coor + 1][y_coor + 2] += 4

modified = True