From 4e6255791bc15d45624ee73d9011f2c522e583e3 Mon Sep 17 00:00:00 2001
From: Peter Ward <peteraward@gmail.com>
Date: Sat, 22 Feb 2014 20:41:17 +1100
Subject: handle collisions

---
 robots/game.py | 59 +++++++++++++++++++++++++++++++++++++++++-----------------
 simple.py      |  5 ++---
 2 files changed, 44 insertions(+), 20 deletions(-)

diff --git a/robots/game.py b/robots/game.py
index 143f391..8fc507b 100644
--- a/robots/game.py
+++ b/robots/game.py
@@ -1,5 +1,6 @@
-from copy import deepcopy
+from collections import defaultdict
 from contextlib import contextmanager
+from copy import deepcopy
 
 from robots.utils import iter_board
 
@@ -56,6 +57,11 @@ class Game:
         self.board = deepcopy(map_)
         self._spawns = _extract_spawn_points(self.board)
 
+        self._painted_tiles = {
+            '*': float('inf'), # not used
+            '.': self.available_tiles,
+        }
+
     def add_bot(self, bot, name=None):
         if name is None:
             name = bot.__name__
@@ -73,6 +79,7 @@ class Game:
             'robots': [spawn],
             'spawn': spawn,
         }
+        self._painted_tiles[name] = 0
 
     @property
     def width(self):
@@ -94,9 +101,7 @@ class Game:
     def finished(self):
         return False
 
-    def next(self):
-        all_actions = []
-
+    def call_bots(self):
         for whoami, bot in self.bots.items():
             try:
                 with protected(self.players, 'players') as players, \
@@ -124,27 +129,47 @@ class Game:
 
             else:
                 for bot, action in zip(my_robots, result):
-                    all_actions.append((whoami, bot, action))
+                    yield whoami, bot, action
 
-        new_robots = {}
+    def apply_actions(self, actions):
+        new_robots = defaultdict(list)
+        bot_locations = defaultdict(int)
 
-        for whoami, bot, action in all_actions:
+        for whoami, bot, action in actions:
             x, y = bot
+
             if action == Actions.PAINT:
+                previous = self.board[y][x]
+                self._painted_tiles[previous] -= 1
+
                 self.board[y][x] = whoami
-            elif action == Actions.NOTHING:
-                pass
-            else:
+                self._painted_tiles[whoami] += 1
+
+            elif action != Actions.NOTHING:
                 dx, dy = DIRECTIONS[action]
-                x += dx
-                y += dy
+                nx = (x + dx) % self.width
+                ny = (y + dy) % self.height
 
-                x %= self.width
-                y %= self.height
+                if self.board[ny][nx] != Squares.WALL:
+                    x = nx
+                    y = ny
 
-            if whoami not in new_robots:
-                new_robots[whoami] = []
             new_robots[whoami].append((x, y))
+            bot_locations[x, y] += 1
+
+        to_remove = set(
+            (x, y)
+            for (x, y), count in bot_locations.items()
+            if count > 1
+        )
 
         for whoami, info in self.players.items():
-            info['robots'][:] = new_robots[whoami]
+            info['robots'][:] = [
+                (x, y)
+                for x, y in new_robots[whoami]
+                if (x, y) not in to_remove
+            ]
+
+    def next(self):
+        actions = self.call_bots()
+        self.apply_actions(actions)
diff --git a/simple.py b/simple.py
index faeb366..1acdd99 100644
--- a/simple.py
+++ b/simple.py
@@ -3,16 +3,15 @@ import robots
 
 def bot(whoami, players, board):
     my_robots = players[whoami]['robots']
-    action = random.choice('UDLRP-')
+    action = random.choice('URP')
     return action * len(my_robots)
 
 if __name__ == '__main__':
     random.seed(64)
-    map_ = robots.empty_map(20, 20, 4)
+    map_ = robots.empty_map(10, 10, 4)
     game = robots.Game(map_)
     game.add_bot(bot, 'Alice')
     game.add_bot(bot, 'Bob')
     game.add_bot(bot, 'Charlie')
-    game.add_bot(bot, 'Doug')
     viewer = robots.CursesViewer(game)
     viewer.run()
-- 
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