public Cell Fire(Coordinate coordinate)
{
switch (Field[coordinate].State)
{
case CellState.ShipDeck:
Field[coordinate] = new Cell { State = CellState.Exploded, Coordinate = coordinate, ShipId = Field[coordinate].ShipId };
var targetShip = _ships.First(s => s.Id == Field[coordinate].ShipId.Value);
targetShip.Shot();
//invoke ship destroyed event
if (targetShip.State == ShipState.Destroyed)
{
var surroundedCells = new List<Cell>();
//mark nearby cells as surrounded
GetSurroundedCoordinatesOfTheShip(targetShip).ForEach(c =>
{
var cell = Field[c];
if (cell.State == CellState.Shot) cell.State = CellState.ShotAndSurrounded;
else if (cell.State == CellState.Empty) cell.State = CellState.Surrounded;
Field[c] = cell;
surroundedCells.Add(cell);
});
//invoke
ShipDestroyed?.Invoke(this, new ShipDestroyedEventArgs { Ship = targetShip, SurroundedCells = surroundedCells });
}
break;
case CellState.Empty:
Field[coordinate] = new Cell { State = CellState.Shot, Coordinate = coordinate };
break;
case CellState.Exploded:
throw new InvalidShotException("Cannot shot again an exploded cell.");
case CellState.Shot:
throw new InvalidShotException("This cell were already shot.");
default:
throw new ArgumentOutOfRangeException();
}
//call event
Fired?.Invoke(this, new FiredEventArgs { Coordinate = coordinate, Result = Field[coordinate].State });
return Field[coordinate];
}
public bool PlaceShip(Ship ship)
{
var decks = (int)ship.Type;
var possibleCoordinates = new Coordinate[decks];
var startingPoint = Coordinate.Copy(ship.StartingPoint);
for (var i = 0; i < decks; i++)
{
//try to validate
if (Field.ValidateCoordinate(startingPoint))
{
//proximity check
if (Field.ProximityCheck(startingPoint)) return false;
possibleCoordinates[i] = Coordinate.Copy(startingPoint);
if (ship.Orientation == ShipOrientation.Vertical)
startingPoint.MoveDown();
else
startingPoint.MoveRight();
}
else
return false;
}
//if everything went fine, persist possibleCoordinates on map
possibleCoordinates.ForEach(c => Field[c] = new Cell { State = CellState.ShipDeck, Coordinate = c, ShipId = ship.Id });
//add ship to collection
_ships.Add(ship);
return true;
}
