// //////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////
// // Piece-Square tables. Tune these to change sunfish's behaviour
// //////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////
/// TODO: add wizard
final piece = {'P': 100, 'N': 280, 'B': 320, 'R': 479, 'Q': 929, 'K': 60000};

///TODO: add 2 raws and 2 colums to each set AND Wizard pst
var pst = {
  'P': [
    0, 0, 0, 0, 0, 0, 0, 0, //
    78, 83, 86, 73, 102, 82, 85, 90, //
    7, 29, 21, 44, 40, 31, 44, 7, //
    -17, 16, -2, 15, 14, 0, 15, -13, //
    -26, 3, 10, 9, 6, 1, 0, -23, //
    -22, 9, 5, -11, -10, -2, 3, -19, //
    -31, 8, -7, -37, -36, -14, 3, -31, //
    0, 0, 0, 0, 0, 0, 0, 0
  ], //
  'N': [
    -66, -53, -75, -75, -10, -55, -58, -70, //
    -3, -6, 100, -36, 4, 62, -4, -14, //
    10, 67, 1, 74, 73, 27, 62, -2, //
    24, 24, 45, 37, 33, 41, 25, 17, //
    -1, 5, 31, 21, 22, 35, 2, 0, //
    -18, 10, 13, 22, 18, 15, 11, -14, //
    -23, -15, 2, 0, 2, 0, -23, -20, //
    -74, -23, -26, -24, -19, -35, -22, -69
  ], //
  'B': [
    -59, -78, -82, -76, -23, -107, -37, -50, //
    -11, 20, 35, -42, -39, 31, 2, -22, //
    -9, 39, -32, 41, 52, -10, 28, -14, //
    25, 17, 20, 34, 26, 25, 15, 10, //
    13, 10, 17, 23, 17, 16, 0, 7, //
    14, 25, 24, 15, 8, 25, 20, 15, //
    19, 20, 11, 6, 7, 6, 20, 16, //
    -7, 2, -15, -12, -14, -15, -10, -10
  ], //
  'R': [
    35, 29, 33, 4, 37, 33, 56, 50, //
    55, 29, 56, 67, 55, 62, 34, 60, //
    19, 35, 28, 33, 45, 27, 25, 15, //
    0, 5, 16, 13, 18, -4, -9, -6, //
    -28, -35, -16, -21, -13, -29, -46, -30, //
    -42, -28, -42, -25, -25, -35, -26, -46, //
    -53, -38, -31, -26, -29, -43, -44, -53, //
    -30, -24, -18, 5, -2, -18, -31, -32
  ], //
  'Q': [
    6, 1, -8, -104, 69, 24, 88, 26, //
    14, 32, 60, -10, 20, 76, 57, 24, //
    -2, 43, 32, 60, 72, 63, 43, 2, //
    1, -16, 22, 17, 25, 20, -13, -6, //
    -14, -15, -2, -5, -1, -10, -20, -22, //
    -30, -6, -13, -11, -16, -11, -16, -27, //
    -36, -18, 0, -19, -15, -15, -21, -38, //
    -39, -30, -31, -13, -31, -36, -34, -42
  ], //
  'K': [
    4, 54, 47, -99, -99, 60, 83, -62, //
    -32, 10, 55, 56, 56, 55, 10, 3, //
    -62, 12, -57, 44, -67, 28, 37, -31, //
    -55, 50, 11, -4, -19, 13, 0, -49, //
    -55, -43, -52, -28, -51, -47, -8, -50, //
    -47, -42, -43, -79, -64, -32, -29, -32, //
    -4, 3, -14, -50, -57, -18, 13, 4, //
    17, 30, -3, -14, 6, -1, 40, 18
  ], //
};

// recalculating Piece-Square raw into desk surrounded by 0-s
List<int> padrow(List<int> row, String k) {
  var rowBody = <int>[for (int x in row) x + piece[k]!];
  return [
    0,
    ...rowBody,
    0,
  ];
}

void setPst() {
  pst.forEach((key, item) {
    final innerItem = [...List.filled(20, 0)];
    for (var i = 0; i < 8; i++) {
      innerItem.addAll(padrow(item.getRange(i * 8, i * 8 + 8).toList(), key));
    }
    innerItem.addAll(List.filled(20, 0));
    pst[key] = innerItem;
  });
}

int getSeconds() {
  return DateTime.now().millisecondsSinceEpoch ~/ 1000.toInt();
}

//////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////
// Global constants
//////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////

// Our board is represented as a 120 character string. The padding allows for
// fast detection of moves that don't stay within the board.

//TODO: Tune globals for 10x10 field
final A1 = 91, H1 = 98, A8 = 21, H8 = 28;
final initial = ('         \n' // 0 -  9
        '         \n' // 10 - 19
        ' rnbqkbnr\n' // 20 - 29
        ' pppppppp\n' // 30 - 39
        ' ........\n' // 40 - 49
        ' ........\n' // 50 - 59
        ' ........\n' // 60 - 69
        ' ........\n' // 70 - 79
        ' PPPPPPPP\n' // 80 - 89
        ' RNBQKBNR\n' // 90 - 99
        '         \n' // 100 -109
        '         \n' // 110 -119
    );

// Lists of possible moves for each piece type.
int N = -10, E = 1, S = 10, W = -1;
//TODO: add directions for Wizard
final Map<String?, List<int>> directions = {
  'P': [N, N + N, N + W, N + E],
  'N': [N + N + E, E + N + E, E + S + E, S + S + E, S + S + W, W + S + W, W + N + W, N + N + W],
  'B': [N + E, S + E, S + W, N + W],
  'R': [N, E, S, W],
  'Q': [N, E, S, W, N + E, S + E, S + W, N + W],
  'K': [N, E, S, W, N + E, S + E, S + W, N + W],
  '.': []
};

// Mate value must be greater than 8*queen + 2*(rook+knight+bishop)
// King value is set to twice this value such that if the opponent is
// 8 queens up, but we got the king, we still exceed MATE_VALUE.
// When a MATE is detected, we'll set the score to MATE_UPPER - plies to get there
// E.g. Mate in 3 will be MATE_UPPER - 6
// TOD: replace mate with King capture event
final MATE_LOWER = piece['K']! - 10 * piece['Q']!;
final MATE_UPPER = piece['K']! + 10 * piece['Q']!;

// The table size is the maximum number of elements in the transposition table.
final TABLE_SIZE = 1e7;

// Constants for tuning search
final QS_LIMIT = 219, EVAL_ROUGHNESS = 13, DRAW_TEST = true;