PhysiGo/app/lib/challenge/models/challenge.dart

class Challenge {
  final List<Exercise> exercises;
  final int bonusExercise;

  const Challenge({
    required this.exercises,
    required this.bonusExercise,
  });

  factory Challenge.fromMap(Map<String, dynamic> data) {
    return Challenge(
      exercises: _getExercise(data["list_exercises"]),
      bonusExercise: data["bonus_exercise"],
    );
  }

  static List<Exercise> _getExercise(List<Map<String, dynamic>> exercises) {
    return exercises.map((exercise) => Exercise.fromMap(exercise)).toList();
  }
}

class Exercise {
  final String description;
  final Difficulty difficulty;
  final String name;
  final int repetitions;
  final int sets;

  const Exercise({
    required this.description,
    required this.difficulty,
    required this.name,
    required this.repetitions,
    required this.sets,
  });

  factory Exercise.fromMap(Map<String, dynamic> data) {
    return Exercise(
      description: data["description"],
      difficulty: Difficulty.values[data["difficulty"]],
      name: data["name"],
      repetitions: data["repetitions"],
      sets: data["sets"],
    );
  }
}

enum Difficulty {
  easy,
  normal,
  hard,
}