SkyTimeline.h

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#pragma once
#include "common/Export.h"
 
#include <array>
#include "common/Result.h"
#include "common/Time.h"
 
namespace eve::daynight {
struct SkyWeather {
    double                cloudCoverage = 0;  // UDS range [0,10].
    double                fog           = 0;
    double                rain          = 0;
    double                snow          = 0;
    std::array<double, 2> windXZ{0, 0};
};
 
struct SkyClock {
    double initialHour    = 12;
    double hoursPerSecond = 1.0 / 3600.0;
};
 
struct SkyFrame {
    double                elapsedSeconds = 0;
    double                hour           = 12;
    SkyWeather            weather;
    std::array<double, 2> cloudTravelXZ{0, 0};
};
 
class EVENGINE_API_WORLD SkyTimeline {
public:
    [[nodiscard]] static Result<SkyTimeline> create(const SkyClock& clock, const SkyWeather& weather);
    [[nodiscard]] Result<void> advance(Duration duration);
    [[nodiscard]] Result<void> transitionTo(const SkyWeather& target, Duration duration);
    [[nodiscard]] SkyFrame frame() const noexcept;
 
private:
    SkyTimeline(const SkyClock& clock, const SkyWeather& weather);
    SkyClock              clock_;
    SkyWeather            from_, to_;
    Duration              elapsed_;
    Duration              transitionStart_;
    Duration              transitionDuration_;
    std::array<double, 2> travelOrigin_{0, 0};
};
}  // namespace eve::daynight