HitFeel.h

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#pragma once
#include "common/Export.h"
 
#include "combat/Damage.h"
#include "common/Result.h"
#include "common/SubjectRef.h"
#include "common/Time.h"
 
#include <cstdint>
#include <map>
#include <string>
#include <vector>
 
namespace eve::combat {
 
struct HitFeelRequest {
    SubjectRef attacker;
    SubjectRef victim;
    Duration   attackerHitstop = Duration::zero();
    Duration   victimHitstop   = Duration::zero();
    Duration   victimHitstun   = Duration::zero();
    HitReaction reaction       = HitReaction::None;
 
    [[nodiscard]] Result<void> validate() const;
};
 
struct HitFeelState {
    SubjectRef subject;
    Duration   hitstopRemaining = Duration::zero();
    Duration   hitstunRemaining = Duration::zero();
    bool       timeFrozen       = false;
};
 
enum class HitFeelEventKind : std::uint8_t { HitstopStarted, HitstopEnded, HitstunStarted, HitstunEnded };
 
struct HitFeelEvent {
    SubjectRef       subject;
    HitFeelEventKind kind = HitFeelEventKind::HitstopStarted;
    SimulationTick   tick = SimulationTick::zero();
};
 
struct HitFeelAdvance {
    SimulationTick            tick = SimulationTick::zero();
    std::vector<HitFeelEvent> events;
};
 
class EVENGINE_API_BACKENDS HitFeelRuntime {
public:
    [[nodiscard]] Result<void> apply(HitFeelRequest request);
    [[nodiscard]] Result<void> applyFromOutcome(const DamageOutcome& outcome);
    [[nodiscard]] Result<HitFeelAdvance> advance(const SimulationStep& step);
    [[nodiscard]] HitFeelState state(SubjectRef subject) const;
    [[nodiscard]] bool isFrozen(SubjectRef subject) const noexcept;
    [[nodiscard]] bool isStunned(SubjectRef subject) const noexcept;
    [[nodiscard]] std::size_t activeCount() const noexcept { return states_.size(); }
 
private:
    std::map<std::string, HitFeelState, std::less<>> states_;
    SimulationTick                                   lastTick_ = SimulationTick::zero();
};
 
}  // namespace eve::combat