/// <summary>
/// A new player join the game session
/// </summary>
/// <param name="id"></param>
public void Join(string id)
{
CheckCurrentState(EnumGameSessionState.WaitingForPlayers, "join is only possible during WaitingForPlayers state");
const int BOARD_SIZE = 10;
if (string.IsNullOrWhiteSpace(id))
{
throw new ArgumentException("invalid player id");
}
if (P1 == null)
{
P1 = playerFactory.New(id, BOARD_SIZE);
}
else
{
if (id.ToLower() == P1.ID.ToLower())
{
throw new ArgumentException("A player cannot play with him/her self");
}
P2 = playerFactory.New(id, BOARD_SIZE);
State = EnumGameSessionState.WaitingPlayerConfirmation;
}
}
private void CheckCurrentState(EnumGameSessionState state, string message)
{
if (State != state)
{
throw new ArgumentException(message);
}
}
/// <summary>
/// Create a new instance of GameSession
/// </summary>
/// <param name="id"></param>
/// <param name="pf"></param>
public GameSession(string id, IPlayerFactory pf)
{
if (string.IsNullOrWhiteSpace(id))
{
throw new ArgumentException("invalid game session id");
}
ID = id;
State = EnumGameSessionState.Created;
playerFactory = pf ?? throw new ArgumentNullException(nameof(pf));
}
/// <summary>
/// Signal when player is ready
/// </summary>
/// <param name="playerId"></param>
public void Ready(string playerId)
{
CheckCurrentState(EnumGameSessionState.WaitingPlayerConfirmation, "game Session is not waiting for player confirmation");
var player = GetRequiredPlayer(playerId);
GetReady(player);
//When both ready, start the game
if (P1.Ready && P2.Ready)
{
State = EnumGameSessionState.Playing;
Current = P1;
}
}
/// <summary>
/// Register player shoot
/// </summary>
/// <param name="playerId"></param>
/// <param name="pos"></param>
public BoardShip Shoot(string playerId, Coordinates pos)
{
CheckCurrentState(EnumGameSessionState.Playing, "invalid game state");
if (pos == null)
{
throw new ArgumentNullException(nameof(pos));
}
if (string.IsNullOrEmpty(playerId))
{
throw new ArgumentException("invalid player id");
}
if (Current.ID != playerId)
{
throw new InvalidOperationException("invalid player turn");
}
var opponent = Current.ID == P1.ID ? P2 : P1;
var target = opponent.Board.Get(pos);
var result = null as BoardShip;
if (target != null)
{
result = opponent.Board.FindShipById(target.ID);
Current.Points++;
opponent.Board.Remove(target);
}
//Is it a game over?
if (opponent.Board.Fleet.Count() == 0)
{
State = EnumGameSessionState.Finished;
Winner = Current;
}
//Turn changes
Current = opponent;
return(result);
}
/// <summary>
/// Initializes a game session
/// </summary>
public void Init()
{
State = EnumGameSessionState.WaitingForPlayers;
}