achivements.dart

enum Achievement { achievementName }

class Level {
  const Level(this.label, this.necessaryPoints, this.index);

  final String label;
  final int necessaryPoints;
  final int index;

  Level next(List<Level> levels) {
    final nextIndex = index + 1;
    if (nextIndex == levels.length) return levels.last;
    return levels.elementAt(nextIndex);
  }
}

class AchievementData {
  const AchievementData({
    required this.scoresByLevel,
    required this.currentScore,
  });

  final Map<int, int> scoresByLevel;
  final int currentScore;
}

const data = {
  Achievement.achievementName: AchievementData(
    currentScore: 10,
    scoresByLevel: {
      1: 0,
      2: 11,
      3: 51,
      4: 101,
      5: 201,
    },
  ),
};

AchievementData getData(Achievement achievement) {
  return data[achievement]!;
}

final achievements = {
  for (var i = 0; i < Achievement.values.length; i++)
    ...generateLevels(Achievement.values.elementAt(i))
};

List<Level> getLevels(Achievement achievement) {
  return achievements[achievement]!;
}

Map<Achievement, List<Level>> generateLevels(Achievement achievement) {
  final p = getData(achievement).scoresByLevel;
  return {
    achievement: [
      for (var l = 1; l < p.length + 1; l++) Level('Nível $l', p[l]!, l - 1)
    ]
  };
}

Level getLevel(Achievement achievement) {
  return getLevels(achievement).reduce((current, next) {
    if (getData(achievement).currentScore >= next.necessaryPoints) return next;
    return current;
  });
}

int getGoalScore(Achievement achievement) {
  final next = getLevel(achievement).next(getLevels(achievement));
  return next.necessaryPoints - 1;
}

double getProgress(Achievement achievement) {
  final level = getLevel(achievement);
  final next = level.next(getLevels(achievement));
  final score = getData(achievement).currentScore - (level.necessaryPoints - 1);
  final necessaryPoints = next.necessaryPoints - level.necessaryPoints;
  return necessaryPoints == 0 ? 1.0 : score / necessaryPoints;
}

void main() {
  final levels = getLevels(Achievement.achievementName);
  final level = getLevel(Achievement.achievementName);
  print('Score: ${getData(Achievement.achievementName).currentScore}');
  print('Current: ${level.label}');
  print('Goal: ${getGoalScore(Achievement.achievementName)}');
  print('Next: ${level.next(levels).label}');
  print('Progress: ${getProgress(Achievement.achievementName)}');
}