LevelSystem.h

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#pragma once
#include "common/Export.h"
 
 
#include "common/Result.h"
 
#include <cstdint>
#include <string>
#include <vector>
 
namespace eve::rpg {
 
class RPGActor;
 
class PreparedProgressionGain {
public:
    PreparedProgressionGain() = default;
    [[nodiscard]] int levelsGained() const noexcept { return nextLevel_ - previousLevel_; }
 
private:
    RPGActor *actor_ = nullptr;
    int       previousLevel_ = 0;
    double    previousXp_ = 0.0;
    double    previousXpToNext_ = 0.0;
    int       nextLevel_ = 0;
    double    nextXp_ = 0.0;
    double    nextXpToNext_ = 0.0;
    friend class LevelSystem;
};
 
struct LevelUpEvent {
    class RPGActor *actor = nullptr;
    int previousLevel = 0;
    int newLevel = 0;
};
 
class EVENGINE_API_PLATFORM LevelSystem {
public:
    static int getLevel(RPGActor *actor);
    static double getXp(RPGActor *actor);
    static double getXpToNext(RPGActor *actor);
    static void setXpToNext(RPGActor *actor, double value);
    static void setLevel(RPGActor *actor, int level);
 
    [[nodiscard]] static eve::Result<void> restoreProgression(RPGActor *actor, int level, double xp,
                                                              double xpToNext);
 
    static bool gainXp(RPGActor *actor, double amount, double xpGrowth = 1.2);
 
    [[nodiscard]] static eve::Result<PreparedProgressionGain>
    prepareGainXp(RPGActor *actor, double amount, double xpGrowth = 1.2);
    [[nodiscard]] static eve::Result<int> commitGainXp(PreparedProgressionGain prepared);
 
    static void pollLevelUps(std::vector<LevelUpEvent> &out);
};
 
}  // namespace eve::rpg