#pragma once
#include "hd2d/Weather.h"

#include <glm/glm.hpp>
#include <vector>

namespace hd2d {

// Time of day: turns an hour into a complete clear-weather WeatherLook by
// smoothly interpolating tweakable keyframes, and moves the directional
// light along a sun arc by day and a moon arc by night (so shadows always
// work). Feed the result to Weather::setClearLook() every frame; the hour is
// usually driven externally (e.g. by a game server).
class DayCycle {
public:
    struct Keyframe {
        float hour;        // [0, 24)
        const char* name;  // for tuning UIs
        WeatherLook look;  // sunAzimuth / sunElevation / daylight are ignored (computed from the hour)
    };

    DayCycle();  // default keys: late night, dawn, morning, noon, afternoon, dusk, night

    WeatherLook look(float hour) const;  // any hour, wraps to [0, 24)
    float daylight(float hour) const;    // 0 night .. 1 day (sun height above the horizon)
    float night(float hour) const;       // 0 day .. 1 night (stars + moon visibility)
    // Direction of the directional light: x = azimuth, y = elevation
    // (radians, see Sun); the sun between sunrise and sunset, else the moon.
    glm::vec2 lightAngles(float hour) const;
    bool moonUp(float hour) const;

    std::vector<Keyframe> keys;  // sorted by hour; interpolation wraps around midnight
    float sunrise = 5.0f, sunset = 19.0f;
    float sunAzimuth = -0.6f;       // azimuth at solar noon
    float sunSweep = 2.6f;          // azimuth travelled from sunrise to sunset
    float sunMaxElevation = 1.05f;
    float moonAzimuth = 0.45f;      // azimuth at the middle of the night
    float moonSweep = 1.6f;
    float moonMaxElevation = 0.62f;
    float horizonFade = 0.12f;      // light elevation (radians) over which it fades in
    float minElevation = 0.05f;     // light never goes lower (keeps shadows stable)
};

}  // namespace hd2d