CombatAttributes.h

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#pragma once
#include "common/Export.h"
 
 
#include "attributes/AttributeSet.h"
#include "common/Result.h"
#include "common/Time.h"
 
#include <map>
#include <string>
#include <string_view>
#include <utility>
#include <vector>
 
namespace eve::combat {
 
struct CombatAttributeDefinition {
    std::string tag;
    double      initialValue         = 0.0;
    double      minimumValue         = 0.0;
    double      maximumValue         = 0.0;
    double      regenerationPerSecond = 0.0;
 
    [[nodiscard]] Result<void> validate() const;
};
 
enum class CombatAttributeEventKind : std::uint8_t { Gain, Loss, Depleted };
 
struct CombatAttributeEvent {
    std::string              tag;
    CombatAttributeEventKind kind = CombatAttributeEventKind::Gain;
    double                   previousValue = 0.0;
    double                   value         = 0.0;
    double                   delta         = 0.0;
};
 
struct CombatAttributeAdvance {
    std::vector<CombatAttributeEvent> events;
};
 
class EVENGINE_API_BACKENDS CombatAttributeRuntime {
public:
    explicit CombatAttributeRuntime(std::string subject = {}) : values_(std::move(subject)) {}
 
    [[nodiscard]] Result<void> registerAttribute(CombatAttributeDefinition definition);
    [[nodiscard]] Result<double> value(std::string_view tag) const;
    [[nodiscard]] Result<std::vector<CombatAttributeEvent>> setValue(std::string_view tag, double value);
    [[nodiscard]] Result<std::vector<CombatAttributeEvent>> modify(std::string_view tag, double delta);
    [[nodiscard]] Result<CombatAttributeAdvance> advance(Duration delta);
    [[nodiscard]] std::vector<CombatAttributeDefinition> definitions() const;
 
private:
    [[nodiscard]] Result<std::vector<CombatAttributeEvent>> commit(const CombatAttributeDefinition& definition,
                                                                   double newValue);
 
    attributes::AttributeSet                       values_;
    std::map<std::string, CombatAttributeDefinition, std::less<>> definitions_;
};
 
}  // namespace eve::combat