mchess-client/lib/utils/widgets/move_history_widget.dart

import 'package:flutter/material.dart';
import 'package:flutter_bloc/flutter_bloc.dart';
import 'package:mchess/chess_bloc/chess_bloc.dart';
import 'package:mchess/chess_bloc/chess_position.dart';
import 'package:mchess/utils/chess_utils.dart';

class MoveHistory extends StatefulWidget {
  const MoveHistory({super.key});

  @override
  State<MoveHistory> createState() => _MoveHistoryState();
}

class _MoveHistoryState extends State<MoveHistory> {
  ChessMoveHistory allMoves = [];
  List<HistoryEntry> entries = [];

  @override
  void initState() {
    super.initState();
  }

  @override
  Widget build(BuildContext context) {
    return BlocBuilder<ChessBloc, ChessBoardState>(builder: (context, state) {
      //We do not use the state, we just use the ChessBloc as a trigger
      var positionManager = ChessPositionManager.getInstance();
      if (positionManager.lastMove == null) return Container();
      var pieceMoved = positionManager.getPieceAt(positionManager.lastMove!.to);
      var pieceChar = pieceCharacter[ChessPieceAssetKey(
          //we take the opposite color because we use dark theme. White pieces appear black and vice versa.
          pieceClass: pieceMoved!.pieceClass,
          color: pieceMoved.color.getOpposite())];

      if (pieceMoved.color == ChessColor.white) {
        var entry = HistoryEntry();
        entry.setWhite(
            pieceChar!, positionManager.lastMove!.to.toAlphabetical());
        entries.add(entry);
      } else {
        var entry = entries.last;
        entry.setBlack(
            pieceChar!, positionManager.lastMove!.to.toAlphabetical());
      }

      return ListView.builder(
        itemCount: entries.length,
        itemBuilder: (context, index) {
          return Text(
            entries[index].toString(),
            style: const TextStyle(fontSize: 20),
          );
        },
      );
    });
  }
}

class HistoryEntry {
  String? wChar;
  String? wTo;
  String? bChar;
  String? bTo;

  HistoryEntry();

  void setWhite(String char, to) {
    wChar = char;
    wTo = to;
  }

  void setBlack(String char, to) {
    bChar = char;
    bTo = to;
  }

  @override
  String toString() {
    String entry = "";
    if (wChar != null) {
      entry = "$entry$wChar$wTo";
    }
    if (bChar != null) {
      entry = "$entry\t\t$bChar$bTo";
    }

    return entry;
  }
}