static private SnakeInfo CalculatePlayerSnake(
IReadOnlyDictionary <Point, PointInfo> locationToPointInfoIndex,
IReadOnlyDictionary <BoardElement, ImmutableHashSet <PointInfo> > boardElementToInfosIndex,
IReadOnlyList <ISnakeInfo> previousTickSnakeInfos,
IReadOnlyDictionary <Point, PointInfo> previousTickLocationToPointInfoIndex)
{
SnakeInfo playerSnake = default;
ImmutableHashSet <PointInfo> playerHeads = GetPlayerHeads(boardElementToInfosIndex);
PointInfo head = playerHeads?.Single();
if (head != default)
{
playerSnake = new SnakeInfo
{
FoundHead = true,
FuryTicksLeft = head.BoardElement == BoardElement.HeadEvil ? -1 : 0,
IsActive =
head.BoardElement != BoardElement.HeadSleep &&
head.BoardElement != BoardElement.HeadDead,
IsPlayerSnake = true
};
playerSnake.AddHead(head.Location);
}
else
{
ImmutableHashSet <PointInfo> playerTails = GetPlayerTails(boardElementToInfosIndex);
PointInfo tail = playerTails?.SingleOrDefault();
if (tail != default)
{
playerSnake = new SnakeInfo
{
FoundTail = true,
FuryTicksLeft = -2,
IsActive = tail.BoardElement != BoardElement.TailInactive,
IsPlayerSnake = true
};
playerSnake.AddTail(tail.Location);
}
}
if (playerSnake == default)
{
playerSnake = new SnakeInfo
{
FoundHead = false,
FoundTail = false,
IsPlayerSnake = true,
FuryTicksLeft = -2,
// Неактивного тела не бывает.
IsActive = true
};
playerSnake.AddTail(GetPlayerBodyPart(boardElementToInfosIndex).First().Location);
}
bool foundNext = true;
while (foundNext)
{
foundNext = false;
if (playerSnake.FoundHead)
{
PointInfo currentTail = locationToPointInfoIndex[playerSnake.Tail];
if (TryGetNextPlayerPoint(playerSnake, currentTail, out PointInfo newTail, searchForBody: true))
{
playerSnake.AddTail(newTail.Location);
foundNext = true;
}
else if (TryGetNextPlayerPoint(playerSnake, currentTail, out newTail, searchForTail: true))
{
playerSnake.AddTail(newTail.Location);
playerSnake.FoundTail = true;
// Если найдены хвост и голова, значит найдено всё тело.
}
}
