import piece
from board import EMPTY, positions

class NullView(object):
    def __init__(self, model):
        self.model = model
    
    def __getattr__(self, name):
        return getattr(self.model, name)

class PlayerView(NullView):
    def __init__(self, model, who_am_i):
        NullView.__init__(self, model)
        self.who_am_i = who_am_i
	self.cachedMask = None

    def pieceAt(self, position):
        if not self.cachedMask:
#            print "Filling cache for", self.who_am_i
            self.cachedMask = self.getMask()
        if not position in self.cachedMask:
            return piece.Fog()
        return self.model.pieceAt(position)

    def getMask(self):
        my_side = piece.MoveablePiece(self, self.who_am_i)
        allowed_positions = {}
        for pos in positions():
            cur_piece = self.model.pieceAt(pos)
            if my_side.isMyPiece(cur_piece):
                allowed_positions[pos] = None
                for allowable_position in cur_piece.moves():
                    allowed_positions[allowable_position] = None
        return allowed_positions