private static PlacingShipResult ValidateInput(int row, int column, Ship ship, Map map)
{
switch (ship.Direction)
{
case Direction.Top:
if (row - ship.Length < -1)
{
return(PlacingShipResult.WithError(ShipOutOfDimensionsError));
}
break;
case Direction.Bottom:
if (row + ship.Length >= map.Fields.Length)
{
return(PlacingShipResult.WithError(ShipOutOfDimensionsError));
}
break;
case Direction.Left:
if (column - ship.Length < -1)
{
return(PlacingShipResult.WithError(ShipOutOfDimensionsError));
}
break;
case Direction.Right:
if (column + ship.Length >= map.Fields[0].Length)
{
return(PlacingShipResult.WithError(ShipOutOfDimensionsError));
}
break;
}
return(map.Fields[row][column].Ship != null?PlacingShipResult.WithError(FieldAlreadyOccupiedError) : new PlacingShipResult());
}
public PlacingShipResult RandomlyPlaceShip(int length)
{
var map = mapRepository.Entity;
if (map == null)
{
throw new MapNotInitializedException();
}
var ship = new Ship(length);
var random = new Random();
var result = new PlacingShipResult();
while (result.Ship == null)
{
var row = random.Next(0, map.Fields.Length - 1);
var column = random.Next(0, map.Fields[0].Length - 1);
ship.Direction = (Direction)random.Next(1, 4);
result = PlaceShip(row, column, ship);
}
return(result);
}
public PlacingShipResult PlaceShip(int row, int column, Ship ship)
{
var map = mapRepository.Entity;
if (map == null)
{
throw new MapNotInitializedException();
}
var result = ValidateInput(row, column, ship, map);
if (!result.Success)
{
return(result);
}
result.Ship = ship;
if (ship.Direction == Direction.Bottom)
{
for (var i = row; i < row + result.Ship.Length; i++)
{
if (map.Fields[i][column].Ship != null)
{
return(PlacingShipResult.WithError(FieldAlreadyOccupiedError));
}
AssignShip(i, column, result.Ship, map);
}
}
else if (result.Ship.Direction == Direction.Top)
{
for (var i = row; i > row - result.Ship.Length; i--)
{
if (map.Fields[i][column].Ship != null)
{
return(PlacingShipResult.WithError(FieldAlreadyOccupiedError));
}
AssignShip(i, column, result.Ship, map);
}
}
else if (result.Ship.Direction == Direction.Right)
{
var mapRow = map.Fields[row];
for (var i = column; i < column + result.Ship.Length; i++)
{
if (mapRow[i].Ship != null)
{
return(PlacingShipResult.WithError(FieldAlreadyOccupiedError));
}
AssignShip(row, i, result.Ship, map);
}
}
else if (result.Ship.Direction == Direction.Left)
{
var mapRow = map.Fields[row];
for (var i = column; i > column - result.Ship.Length; i--)
{
if (mapRow[i].Ship != null)
{
return(PlacingShipResult.WithError(FieldAlreadyOccupiedError));
}
AssignShip(row, i, result.Ship, map);
}
}
mapRepository.Save(map);
return(result);
}
