public IEnumerable <PlayedWordLetter> WordTiles(Func <int, int, char> userTileGetter, Func <int, int, char> boardTileGetter)
{
for (int y = minY; y <= maxY; y++)
{
char tile = boardTileGetter(x, y);
if (tile == ' ')
{
// The board has no tile here, so the user must be playing
// in this space. Include the multiplier from the board
yield return(PlayedWordLetter.CreateWithBoardMultiplier(userTileGetter(x, y), x, y));
}
else
{
// The board has a tile here already, so multipliers aren't used
yield return(PlayedWordLetter.Create(tile));
}
}
}
protected internal List <PlayedWord> FindWords()
{
if (!IsValidMove(out string error))
{
throw new InvalidOperationException(error);
}
List <PlayedWord> results = new List <PlayedWord>();
// Check the main word that's been played
PlayedWordBuilder mainWordBuilder = new PlayedWordBuilder();
foreach (PlayedWordLetter tile in directionStrategy.WordTiles(
(x, y) => placements.SingleOrDefault(p => p.X == x && p.Y == y)?.Tile ?? ' ',
(x, y) => game[x, y]))
{
mainWordBuilder.AddBoardTileAtEnd(tile);
}
// Are the existing letters before/after it?
foreach (PlayedWordLetter tile in directionStrategy.BeforeWordTiles((x, y) => game[x, y]))
{
mainWordBuilder.AddBoardTileAtStart(tile);
}
foreach (PlayedWordLetter tile in directionStrategy.AfterWordTiles((x, y) => game[x, y]))
{
mainWordBuilder.AddBoardTileAtEnd(tile);
}
var mainWord = mainWordBuilder.GetPlayedWord();
if (mainWord.ToString().Length > 1 || game.IsFirstMove())
{
results.Add(mainWord);
}
// Check for any intersecting words
foreach (var placement in placements)
{
var oppositeStrategy = directionStrategy.GetOppositeStrategy(placement);
var crossWordBuilder = new PlayedWordBuilder();
crossWordBuilder.AddBoardTileAtStart(PlayedWordLetter.CreateWithBoardMultiplier(placement.Tile, placement.X, placement.Y));
foreach (PlayedWordLetter tile in oppositeStrategy.BeforeWordTiles((x, y) => game[x, y]))
{
crossWordBuilder.AddBoardTileAtStart(tile);
}
foreach (PlayedWordLetter tile in oppositeStrategy.AfterWordTiles((x, y) => game[x, y]))
{
crossWordBuilder.AddBoardTileAtEnd(tile);
}
var crossWord = crossWordBuilder.GetPlayedWord();
if (crossWord.ToString().Length > 1)
{
results.Add(crossWord);
}
}
return(results);
}