private IEnumerable <Tuple <ShipType, CellPosition, bool> > GenerateContinuesForDamagedShip(
IList <CellPosition> damagedShipCells, IGameFieldBuilder builder, bool vertical, ShipType ship)
{
if (builder.ShipsLeft[ship] == 0)
{
yield break;
}
var topLeftCell = damagedShipCells.Min();
var delta = vertical ? CellPosition.DeltaDown : CellPosition.DeltaRight;
var start = vertical
? new CellPosition(0, topLeftCell.Column)
: new CellPosition(topLeftCell.Row, 0);
for (; builder.Contains(start); start += delta)
{
if (!builder.CanBeAddedSafely(ship, start, vertical, x => OpponentFieldKnowledge[x] != false))
{
continue;
}
var newShipCells = Enumerable.Range(0, ship.GetLength()).Select(x => start + delta * x).ToList();
if (damagedShipCells.Any(x => !newShipCells.Contains(x)))
{
continue;
}
yield return(Tuple.Create(ship, start, vertical));
}
}
private static IEnumerable <CellPosition> GenerateShipCells(
ShipType ship, CellPosition start, bool vertical)
{
var delta = vertical ? CellPosition.DeltaDown : CellPosition.DeltaRight;
for (var i = 0; i < ship.GetLength(); i++)
{
yield return(start + delta * i);
}
}