// NewRootState creates the root State of a mancala game search tree with a
// mancala.Referee and mancala.PlayerIndex.
func NewRootState(
referee *mancala.Referee,
index mancala.PlayerIndex,
) *State {
return &State{
parent: nil,
referee: referee,
information: NewInformation(referee.Board(), index.Other(), -1),
}
}
// Play makes a move for an ExamplePlayer.
//
// If no legal moves can be found, an invalid mancala.HouseIndex is returned
// along with an error.
func (player ExamplePlayer) Play(
referee *mancala.Referee,
index mancala.PlayerIndex,
) (mancala.HouseIndex, error) {
for i := 0; i < mancala.RowWidth; i++ {
house := mancala.HouseIndex(i)
if _, err := referee.SimulateMove(index, house); err == nil {
return house, nil
}
}
return -1, fmt.Errorf(
"ExamplePlayer couldn't find a legal HouseIndex as %v on "+
"board \n%v",
index,
referee.Board(),
)
}
// Play makes a move for a fastPlayer.
//
// If there are no legal moves, an invalid mancala.HouseIndex is returned along
// with an error stating that the fastPlayer couldn't find a valid
// mancala.houseIndex.
func (fast fastPlayer) Play(
referee *mancala.Referee,
player mancala.PlayerIndex,
) (mancala.HouseIndex, error) {
for i := 0; i < mancala.RowWidth; i++ {
house := mancala.HouseIndex(i)
if _, err := referee.SimulateMove(player, house); err == nil {
return house, nil
}
}
return -1, fmt.Errorf(
"fastPlayer couldn't find a legal HouseIndex as %v on board\n"+
"%v",
player,
referee.Board(),
)
}