#pragma once

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

namespace wowee {
namespace rendering {

class Shader;
class Camera;

/**
 * Skybox renderer
 *
 * Renders an atmospheric sky dome with gradient colors.
 * The sky uses a dome/sphere approach for realistic appearance.
 */
class Skybox {
public:
    Skybox();
    ~Skybox();

    bool initialize();
    void shutdown();

    /**
     * Render the skybox
     * @param camera Camera for view matrix (position is ignored for skybox)
     * @param timeOfDay Time of day in hours (0-24), affects sky color
     */
    void render(const Camera& camera, float timeOfDay = 12.0f);

    /**
     * Enable/disable skybox rendering
     */
    void setEnabled(bool enabled) { renderingEnabled = enabled; }
    bool isEnabled() const { return renderingEnabled; }

    /**
     * Set time of day (0-24 hours)
     * 0 = midnight, 6 = dawn, 12 = noon, 18 = dusk, 24 = midnight
     */
    void setTimeOfDay(float time);
    float getTimeOfDay() const { return timeOfDay; }

    /**
     * Enable/disable time progression
     */
    void setTimeProgression(bool enabled) { timeProgressionEnabled = enabled; }
    bool isTimeProgressionEnabled() const { return timeProgressionEnabled; }

    /**
     * Update time progression
     */
    void update(float deltaTime);

    /**
     * Get horizon color for fog (public for fog system)
     */
    glm::vec3 getHorizonColor(float time) const;

private:
    void createSkyDome();
    void destroySkyDome();

    glm::vec3 getSkyColor(float altitude, float time) const;
    glm::vec3 getZenithColor(float time) const;

    std::unique_ptr<Shader> skyShader;

    uint32_t vao = 0;
    uint32_t vbo = 0;
    uint32_t ebo = 0;
    int indexCount = 0;

    float timeOfDay = 12.0f;  // Default: noon
    float timeSpeed = 1.0f;   // 1.0 = 1 hour per real second
    bool timeProgressionEnabled = false;
    bool renderingEnabled = true;
};

} // namespace rendering
} // namespace wowee