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server_logic.py
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server_logic.py
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import random
from typing import List, Dict
import find_board
"""
This file can be a nice home for your move logic, and to write helper functions.
We have started this for you, with a function to help remove the 'neck' direction
from the list of possible moves!
"""
def remove_move(move: str, possible_moves: List[str]) -> List[str]:
if move in possible_moves:
possible_moves.remove(move)
return possible_moves
def current_direction(my_head: Dict[str, int], my_body: List[dict]) -> str:
my_neck = my_body[1] # The segment of body right after the head is the 'neck'
if my_neck["x"] < my_head["x"]: # my neck is left of my head
return "right"
elif my_neck["x"] > my_head["x"]: # my neck is right of my head
return "left"
elif my_neck["y"] < my_head["y"]: # my neck is below my head
return "up"
elif my_neck["y"] > my_head["y"]: # my neck is above my head
return "down"
def wall_vision(my_head: Dict[str, int], board: Dict[str, int]) -> List[str]:
"""
return: A matrix representing the 8 blocks directly surrounding the snake's head.
"""
top_row = board["height"] - 1
right_column = board["width"] - 1
vision = []
for y in range(my_head["y"]-1, my_head["y"]+2):
for x in range(my_head["x"]-1, my_head["x"]+2):
if y < 0 or y > top_row: # near wall
vision.append("X")
elif x < 0 or x > right_column: # near wall
vision.append("X")
elif my_head["x"] == x and my_head["y"] == y:
vision.append("H")
else:
vision.append("S")
return vision
def apple_vision(size: int, my_head: Dict[str, int], board: Dict[str, int]) -> str:
"""
return: A matrix representing the blocks directly surrounding the snake's head.
"""
vision = ''
x_range = range(my_head['x'] - size//2, my_head['x'] + size//2 + 1)
y_range = range(my_head['y'] - size//2, my_head['y'] + size//2 + 1)
for y in y_range:
for x in x_range:
space = "S"
if my_head["x"] == x and my_head["y"] == y:
space = "H"
else:
for apple in board["food"]:
if x == apple["x"] and y == apple["y"]:
space = "O"
vision += space
return vision
def print_vision(size: int, board: str):
for i in range(len(board), 0, -size):
row = ''
for j in range(i - size, i):
row += board[j]
print(row)
def avoid_walls(my_head: Dict[str, int], board: Dict[str, int], possible_moves: List[str]) -> List[str]:
top_row = board["height"] - 1
right_column = board["width"] - 1
if my_head["x"] == 0: # near left wall
print("Detected left wall")
remove_move("left", possible_moves)
elif my_head["x"] == right_column: # near right wall
print("Detected right wall")
remove_move("right", possible_moves)
if my_head["y"] == 0: # near bottom wall
print("Detected bottom wall")
remove_move("down", possible_moves)
elif my_head["y"] == top_row: # near top wall
print("Detected top wall")
remove_move("up", possible_moves)
return possible_moves
def avoid_snakes(my_head: Dict[str, int], snakes: List[dict], possible_moves: List[str]) -> List[str]:
"""
my_head: Dictionary of x/y coordinates of the Battlesnake head.
e.g. {"x": 0, "y": 0}
snakes: List of dictionaries of x/y coordinates for every segment of a Battlesnake.
e.g. [ {"x": 0, "y": 0}, {"x": 1, "y": 0}, {"x": 2, "y": 0} ]
possible_moves: List of strings. Moves to pick from.
e.g. ["up", "down", "left", "right"]
return: The list of remaining possible_moves not blocked by other snakes
"""
for snake in snakes:
for segment in snake["body"]:
if my_head["x"] - 1 == segment["x"] and my_head["y"] == segment["y"]:
print("Segment to the left")
remove_move("left", possible_moves)
if my_head["x"] + 1 == segment["x"] and my_head["y"] == segment["y"]:
print("Segment to the right")
remove_move("right", possible_moves)
if my_head["x"] == segment["x"] and my_head["y"] - 1 == segment["y"]:
print("Segment below")
remove_move("down", possible_moves)
if my_head["x"] == segment["x"] and my_head["y"] + 1 == segment["y"]:
print("Segment above")
remove_move("up", possible_moves)
# We're going to be super conservative if we're near another head
# to avoid head on collisions
if my_head["x"] - 2 == snake["head"]["x"] and my_head["y"] == snake["head"]["y"]:
print("Dodge the head!")
remove_move("left", possible_moves)
if my_head["x"] + 2 == snake["head"]["x"] and my_head["y"] == snake["head"]["y"]:
print("Dodge the head!")
remove_move("right", possible_moves)
if my_head["x"] == snake["head"]["x"] and my_head["y"] - 2 == snake["head"]["y"]:
print("Dodge the head!")
remove_move("down", possible_moves)
if my_head["x"] == snake["head"]["x"] and my_head["y"] + 2 == snake["head"]["y"]:
print("Dodge the head!")
remove_move("up", possible_moves)
if my_head["x"] - 1 == snake["head"]["x"] and my_head["y"] + 1 == snake["head"]["y"]:
print("Dodge the head!")
remove_move("left", possible_moves)
remove_move("up", possible_moves)
if my_head["x"] - 1 == snake["head"]["x"] and my_head["y"] - 1 == snake["head"]["y"]:
print("Dodge the head!")
remove_move("left", possible_moves)
remove_move("down", possible_moves)
if my_head["x"] + 1 == snake["head"]["x"] and my_head["y"] + 1 == snake["head"]["y"]:
print("Dodge the head!")
remove_move("right", possible_moves)
remove_move("up", possible_moves)
if my_head["x"] + 1 == snake["head"]["x"] and my_head["y"] - 1 == snake["head"]["y"]:
print("Dodge the head!")
remove_move("right", possible_moves)
remove_move("down", possible_moves)
return possible_moves
def choose_move(data: dict) -> str:
"""
data: Dictionary of all Game Board data as received from the Battlesnake Engine.
For a full example of 'data', see https://docs.battlesnake.com/references/api/sample-move-request
return: A String, the single move to make. One of "up", "down", "left" or "right".
Use the information in 'data' to decide your next move. The 'data' variable can be interacted
with as a Python Dictionary, and contains all of the information about the Battlesnake board
for each move of the game.
"""
my_head = data["you"]["head"] # A dictionary of x/y coordinates like {"x": 0, "y": 0}
my_body = data["you"]["body"] # A list of x/y coordinate dictionaries like [ {"x": 0, "y": 0}, {"x": 1, "y": 0}, {"x": 2, "y": 0} ]
# my_vision = wall_vision(my_head, data["board"])
# print_vision(my_vision)
my_apple_vision = apple_vision(5, my_head, data["board"])
# print_vision(3, my_apple_vision)
# TODO: uncomment the lines below so you can see what this data looks like in your output!
# print(f"All board data this turn: {data}")
print(f"~~~ Turn: {data['turn']} Game Mode: {data['game']['ruleset']['name']} ~~~")
print(f"My Battlesnakes head this turn is: {my_head}")
print(f"My Battlesnakes body this turn is: {my_body}")
possible_moves = ["up", "down", "left", "right"]
# TODO: Using information from 'data', find the edges of the board and don't let your Battlesnake move beyond them
possible_moves = avoid_walls(my_head, data["board"], possible_moves)
"""
# Right now edge detection is minimal -- it's not worth using search here.
# If we can build out the edge detection to include combinations of walls
# and snakes, this could be worth a second search
"""
# possible_moves = find_board.avoid_walls(my_vision, possible_moves)
# TODO Using information from 'data', don't let your Battlesnake pick a move that would hit its own body
# TODO: Using information from 'data', don't let your Battlesnake pick a move that would collide with another Battlesnake
possible_moves = avoid_snakes(my_head, data["board"]["snakes"], possible_moves)
# TODO: Using information from 'data', make your Battlesnake move towards a piece of food on the board
best_moves = find_board.find_food(5, my_apple_vision, possible_moves)
print(f"Best moves: {best_moves}")
# Choose a random direction from the remaining possible_moves to move in, and then return that move
move = ''
if possible_moves:
for best_move in best_moves:
if best_move in possible_moves:
move = best_move
print(f"{data['game']['id']} MOVE {data['turn']}: {move} picked as best move {possible_moves}")
return move
direction = current_direction(my_head, my_body)
if direction in possible_moves:
move = direction
print(f"{data['game']['id']} MOVE {data['turn']}: Continue going {move}")
return move
if "left" in possible_moves and "right" in possible_moves:
if my_head["x"] > data["board"]["width"]//2:
move = "left"
print(f"{data['game']['id']} MOVE {data['turn']}: More room {move}")
return move
else:
move = "right"
print(f"{data['game']['id']} MOVE {data['turn']}: More room {move}")
return move
if "up" in possible_moves and "down" in possible_moves:
if my_head["y"] > data["board"]["height"]//2:
move = "down"
print(f"{data['game']['id']} MOVE {data['turn']}: More room {move}")
return move
else:
move = "up"
print(f"{data['game']['id']} MOVE {data['turn']}: More room {move}")
return move
move = random.choice(possible_moves)
print(f"{data['game']['id']} MOVE {data['turn']}: {move} picked randomly from all valid options in {possible_moves}")
return move
else:
print("No possible moves.")
return "down"
# TODO: Explore new strategies for picking a move that are better than random