import 'state.dart';

class Util {
  static Iterable<TTCState> getRow(int index, List<TTCState> data) =>
      data.getRange(index, index + 3);
  static Iterable<TTCState> getCol(int index, List<TTCState> data) => [
        data[index],
        data[index + 3],
        data[index + 3 * 2],
      ];
  static Iterable<TTCState> getCross(int index, List<TTCState> data) {
    if (index == 0) {
      return [data[0], data[4], data[8]];
    }
    return [data[3], data[4], data[6]];
  }

  static TTCState checkRow(Iterable<TTCState> row) =>
      row.reduce((value, element) => (element == TTCState.empty ||
              value == TTCState.empty ||
              element != value)
          ? TTCState.empty
          : value);

  static TTCState checkBoard(Iterable<TTCState> rowValues) =>
      rowValues.reduce((value, element) {
        if (value != TTCState.empty) {
          return value;
        }
        if (element != TTCState.empty) {
          return element;
        }

        return TTCState.empty;
      });

  static TTCState checkWin(List<TTCState> data) {
    Iterable<TTCState> rows =
        Iterable.generate(3, (i) => checkRow(getRow(i, data)));
    Iterable<TTCState> cols =
        Iterable.generate(3, (i) => checkRow(getCol(i, data)));
    Iterable<TTCState> crosses =
        Iterable.generate(2, (i) => checkRow(getCross(i, data)));

    return checkBoard([...rows, ...cols, ...crosses]);
  }
}