import 'dart:io';
import 'package:dartsunfish/index.dart';

class GameBot {
  GameBot();

  void gameMain() {
    var hist = <Position>[
      Position(initial, 0, [true, true], [true, true], 0, 0),
    ];
    var searcher = Searcher();
    while (true) {
      UI.printBoard(hist.last);

      if (hist.last.score <= -MATE_LOWER) {
        print('You lost');
        break;
      }

      // We query the user until she enters a (pseudo) legal move.
      var move = <int>[];
      var score = 0;
      final possibleMoves = hist.last.generateMoves().toList();
      while (!possibleMoves.doContains(move)) {
        var pattern = RegExp(
          r'([a-h][1-8])' * 2,
          caseSensitive: false,
          multiLine: false,
        );
        print('Your move:');
        var input = stdin.readLineSync();
        var match = pattern.firstMatch(input.toString());
        if (match != null) {
          move = [UI.parse(match.group(1)), UI.parse(match.group(2))];
          if (!possibleMoves.doContains(move)) {
            print('Not valid move typed in. Try again');
          }
        } else {
          // Inform the user when invalid input (e.g. "help") is entered
          print('Please enter a move like g8f6');
        }
      }
      try {
        hist.add(hist.last.movePiece(move));
      } catch (e) {
        // print(e.toString());
      }

      // After our move we rotate the board and print it again.
      // This allows us to see the effect of our move.
      UI.printBoard(hist.last.rotate());
      // print('${hist.last.score}');

      if (hist.last.score <= -MATE_LOWER) {
        print('You won');
        break;
      }
/*
    */
      // Fire up the engine to look for a move.
      // var _depth = 0;
      var start = getSeconds();
      for (var s in searcher.search(hist.last, hist.toSet())) {
        // _depth = s[0];
        move = s[0];
        score = s[1] ?? 0;
        if (getSeconds() - start > 1) {
          break;
        }
      }

      if (score == MATE_UPPER) {
        print('Checkmate!');
      }
      // The black player moves from a rotated position, so we have to
      // 'back rotate' the move before printing it.
      print('My move: ${UI.render(119 - move[0]) + UI.render(119 - move[1])}');
      hist.add(hist.last.movePiece(move));
    }
  }

  void playGame() {
    setPst();
    gameMain();
  }
}