// Play asks for input from an external source until a valid move is given.
func (human *HumanAgent) Play(
referee *mancala.Referee,
player mancala.PlayerIndex,
) (mancala.HouseIndex, error) {
move := mancala.HouseIndex(-1)
var moveLine string
for move == -1 {
fmt.Printf("%s, make a move:\n", strings.Title(player.String()))
fmt.Scanf("%s", &moveLine)
fmt.Println()
parsedMove, err := strconv.Atoi(moveLine)
if err != nil {
fmt.Println("Input must be an integer.")
fmt.Println()
moveLine = ""
} else if _, err := referee.SimulateMove(
player,
mancala.HouseIndex(parsedMove),
); err != nil {
fmt.Printf("Illegal move: %v.\n", err)
fmt.Println()
moveLine = ""
move = -1
} else {
move = mancala.HouseIndex(parsedMove)
}
}
return move, nil
}
// TestResultLastMove tests that manacala.Result::LastMove returns the last
// move.
func TestResultLastMove(t *testing.T) {
t.Parallel()
expected := mancala.HouseIndex(1)
actual := mancala.NewResult(
mancala.NewBoard(),
-1,
0,
expected,
nil,
).LastMove()
if actual != expected {
t.Errorf("result.LastMove() = %d, want %d", actual, expected)
}
}
// 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(),
)
}
// ReachableStates returns all the States reachable from the current State.
func (state *State) ReachableStates() []*State {
var states []*State
playerIndex := state.Information().PlayerIndex().Other()
for i := 0; i < mancala.RowWidth; i++ {
houseIndex := mancala.HouseIndex(i)
if board, err := state.referee.SimulateMove(
playerIndex,
houseIndex,
); err == nil {
information := NewInformation(
board,
playerIndex,
houseIndex,
)
states = append(states, NewState(state, information))
}
}
return states
}
