mchess-client/lib/api/move.dart

class ApiMove {
  final ApiCoordinate startSquare;
  final ApiCoordinate endSquare;
  String? promotionToPiece;

  ApiMove({
    required this.startSquare,
    required this.endSquare,
    this.promotionToPiece,
  });

  factory ApiMove.fromJson(Map<String, dynamic> json) {
    final startSquare = ApiCoordinate.fromJson(json['startSquare']);
    final endSquare = ApiCoordinate.fromJson(json['endSquare']);
    final promotionToPiece = json['promotionToPiece'];

    return ApiMove(
        startSquare: startSquare,
        endSquare: endSquare,
        promotionToPiece: promotionToPiece);
  }

  Map<String, dynamic> toJson() => {
        'startSquare': startSquare,
        'endSquare': endSquare,
        'promotionToPiece': promotionToPiece
      };
}

class ApiCoordinate {
  final int col;
  final int row;

  const ApiCoordinate({required this.col, required this.row});

  factory ApiCoordinate.fromJson(Map<String, dynamic> json) {
    return ApiCoordinate(col: json['col'], row: json['row']);
  }

  Map<String, dynamic> toJson() => {'col': col, 'row': row};
}