/// <summary>
/// Generates magic bitboards for the specified parameters.
/// </summary>
/// <param name="attacksGenerator">The attacks generator.</param>
/// <param name="patternBitsCount">The array of pattern set bits count.</param>
/// <param name="keys">The array of magic keys.</param>
/// <returns>The array of fields containing a list of possible attacks for bishop (accessed by magic keys).</returns>
public ulong[][] GenerateMagicBitboards(IAttacksGenerator attacksGenerator, int[] patternBitsCount, ulong[] keys)
{
var bishopAttacks = new ulong[64][];
for (var i = 0; i < 64; i++)
{
var attacks = attacksGenerator.Generate(i);
var maskBitsCount = patternBitsCount[i];
bishopAttacks[i] = GenerateMagicAttacks(attacks, keys, maskBitsCount, i);
}
return(bishopAttacks);
}
/// <summary>
/// Calculates magic keys for the specified piece.
/// </summary>
/// <param name="attacksGenerator">RookAttacksGenerator for rook or BishopAttacksGenerator for bishop</param>
/// <param name="pieceAttackPatterns">BishopAttacksGenerator for rook PatternsContainer.BishopPattern for bishop</param>
/// <returns>Array of magic keys for the specified piece</returns>
private ulong[] GetKeys(IAttacksGenerator attacksGenerator, ulong[] pieceAttackPatterns)
{
var keys = new ulong[64];
for (var fieldIndex = 0; fieldIndex < 64; fieldIndex++)
{
var mask = pieceAttackPatterns[fieldIndex];
var maskLength = BitOperations.Count(mask);
var patterns = attacksGenerator.Generate(fieldIndex);
keys[fieldIndex] = _magicKeyGenerator.GenerateKey(patterns, maskLength);
DisplayStatus(fieldIndex, keys[fieldIndex], maskLength, patterns.Count);
}
return(keys);
}
