1  """
 2  Constants representing the game variation being played.
 3  Most constants are global and come from game engine and are immutable and are strictly informational.
 4  Some constants are only used by the local game client and so are mutable.
 5  """
 6  
 7  ################################################
 8  # Local and mutable constants.
 9  
10  """Maximum number of steps to consider in pathfinding."""
11  MAX_BFS_STEPS = 1024  # = can search a 32x32 area completely
12  
13  ################################################
14  # Global and immutable constants.
15  
16  """The maximum amount of halite a ship can carry."""
17  MAX_HALITE = 1000
18  """The cost to build a single ship."""
19  SHIP_COST = 500
20  """The cost to build a dropoff."""
21  DROPOFF_COST = 2000
22  """The maximum number of turns a game can last."""
23  MAX_TURNS = 500
24  """1/EXTRACT_RATIO halite (rounded) is collected from a square per turn."""
25  EXTRACT_RATIO = 4
26  """1/MOVE_COST_RATIO halite (rounded) is needed to move off a cell."""
27  MOVE_COST_RATIO = 10
28  
29  def load_constants(constants):
30      """
31      Load constants from JSON given by the game engine.
32      """
33      global SHIP_COST, DROPOFF_COST, MAX_HALITE, MAX_TURNS
34      global EXTRACT_RATIO, MOVE_COST_RATIO
35      SHIP_COST = constants.get('NEW_ENTITY_ENERGY_COST', SHIP_COST)
36      DROPOFF_COST = constants.get('DROPOFF_COST', DROPOFF_COST)
37      MAX_HALITE = constants.get('MAX_ENERGY', MAX_HALITE)
38      MAX_TURNS = constants.get('MAX_TURNS', MAX_TURNS)
39      EXTRACT_RATIO = constants.get('EXTRACT_RATIO', EXTRACT_RATIO)
40      MOVE_COST_RATIO = constants.get('MOVE_COST_RATIO', MOVE_COST_RATIO)