import 'package:flutter_test/flutter_test.dart';
import 'package:gobang/services/ai_service.dart';
import 'package:gobang/utils/constants.dart';

void main() {
  late AiService ai;

  setUp(() {
    ai = AiService.getInstance();
    ai.init();
  });

  test('board size constant', () {
    expect(kBoardSize, 15);
    expect(ai.chessboard.length, 15);
  });

  test('isWin detects horizontal five', () {
    for (var i = 0; i < 5; i++) {
      ai.addChessman(i, 7, 1);
    }
    expect(ai.isWin(2, 7, 1), isTrue);
    expect(ai.isWin(2, 7, -1), isFalse);
  });

  test('searchPosition returns empty cell', () {
    ai.addChessman(7, 7, 1);
    final pos = ai.searchPosition();
    expect(pos.dx, isNonNegative);
    expect(pos.dy, isNonNegative);
    expect(ai.isLegal(pos.dx.toInt(), pos.dy.toInt()), isTrue);
  });

  test('illegal after occupied', () {
    ai.addChessman(3, 3, 1);
    expect(ai.isLegal(3, 3), isFalse);
  });
}