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from collections import defaultdict, deque
from contextlib import contextmanager
from copy import deepcopy
from random import random
import time
import traceback
from robots.constants import Action, City, DIRECTIONS, Energy, ENERGY_BY_ACTION
from robots.state import GameState
from robots.utils import iter_board
@contextmanager
def protected(value, name):
value_copy = deepcopy(value)
try:
yield value_copy
finally:
if value_copy != value:
raise RuntimeError('Protected value %s was modified.' % name)
def extract_spawn_points(map_):
points = []
for x, y, cell in iter_board(map_):
try:
n = int(cell)
except ValueError:
pass
else:
points.append((n, (x, y)))
map_[y][x] = City.NORMAL
points.sort()
return [point for n, point in points]
class Game:
def __init__(self, map_):
self.bots = {}
self.time = 0
map_ = deepcopy(map_)
self.spawn_points = deque(extract_spawn_points(map_))
self.state = GameState(map_)
def add_bot(self, bot, name=None):
if name is None:
name = bot.__name__
if name in self.bots:
raise KeyError(
'There is already a bot named %r in this game!' %
(name,)
)
self.bots[name] = bot
# Place the initial robot for this player.
x, y = self.spawn_points.popleft()
self.state.robots_by_player[name] = [
(x, y, Energy.INITIAL),
]
@property
def finished(self):
target = self.state.n_cities_to_win
winners = []
roboteers = []
n_allegiances_by_player = self.state.n_allegiances_by_player
for name, robots in self.state.robots_by_player.items():
n_cities = n_allegiances_by_player[name]
if n_cities >= target:
winners.append(name)
if robots:
roboteers.append(name)
won = bool(winners)
if len(roboteers) <= 1:
won = True
winners.extend(roboteers)
return winners or won
def call_bots(self):
for whoami, bot in self.bots.items():
try:
with protected(self.state, 'state') as state:
result = bot(whoami, state)
assert isinstance(result, (str, list, tuple)), \
'Bot did not return a str/list/tuple, got %r' % (result,)
result = str(''.join(result))
my_robots = self.state.robots_by_player[whoami]
assert len(result) == len(my_robots), (
'Bot did not return an action for all robots '
'(%d actions != %d robots)' % (len(result), len(my_robots))
)
for action in result:
assert action in Action.all, (
'Got unexpected action %r' % (action,)
)
except Exception:
# TODO: log this exception
traceback.print_exc()
time.sleep(1)
else:
for bot, action in zip(my_robots, result):
yield whoami, bot, action
def apply_actions(self, actions):
robots_by_player = defaultdict(list)
for whoami, bot, action in actions:
x, y, energy = bot
if energy < ENERGY_BY_ACTION[action]:
action = Action.NOTHING
if action == Action.PROMOTE:
if self.state.allegiances.get((x, y)) != whoami:
self.state.allegiances[x, y] = whoami
else:
action = Action.NOTHING
elif action != Action.NOTHING:
nx, ny = self.state.expected_position(x, y, action)
if x == nx and y == ny:
action = Action.NOTHING
x, y = nx, ny
energy -= ENERGY_BY_ACTION[action]
robots_by_player[whoami].append((x, y, energy))
for name, robots in self.state.robots_by_player.items():
robots[:] = robots_by_player[name]
def factories_produce_robots(self):
state_robots = self.state.robots
for x, y in self.state.factories:
if state_robots[(x, y)]:
continue
owner = self.state.allegiances.get((x, y))
if owner is None:
continue
if random() < 0.2:
self.state.robots_by_player[owner].append(
(x, y, Energy.INITIAL)
)
def robots_gain_energy(self):
for robots in self.state.robots_by_player.values():
robots[:] = [
(x, y, min(Energy.MAXIMUM, energy + Energy.GAIN))
for x, y, energy in robots
]
def resolve_combats(self):
to_remove = set()
to_append = defaultdict(list)
for (x, y), robots in self.state.robots.items():
if len(robots) <= 1:
# No combat here.
continue
to_remove.add((x, y))
# each player's strength is the sum of their robots' energy
strength_by_player = defaultdict(int)
total = 0
for player, energy in robots:
strength_by_player[player] += energy
total += energy
winner_count = 0
for player, strength in strength_by_player.items():
# subtract the sum of the other players' strength
strength -= total - strength
# remove with strength players <= 0
if strength > 0:
energy = min(strength, Energy.MAXIMUM)
to_append[player].append((x, y, energy))
winner_count += 1
# we should end up with one player.
# (and I wrote a proof of that, so something's seriously wrong if
# this fails)
assert winner_count <= 1
for player, robots in self.state.robots_by_player.items():
extra_robots = to_append[player]
robots[:] = [
(x, y, energy)
for x, y, energy in robots
if (x, y) not in to_remove
] + extra_robots
def __iter__(self):
while not self.finished:
yield self.state
self.next()
yield self.state
def next(self):
# 1. You give commands you your robots.
actions = self.call_bots()
# 2. They perform the requested commands.
self.apply_actions(actions)
# 3. Factories produce new robots.
self.factories_produce_robots()
# 4. Combats are resolved.
self.resolve_combats()
# 5. Each robot gains energy, up to the maximum.
self.robots_gain_energy()
self.time += 1
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