#pragma once
#include <glm/glm.hpp>

namespace hd2d {

// Orbit camera looking at `target`. HD-2D scenes use a high, narrow-FOV
// (near telephoto) camera tilted down so the world reads like a diorama.
struct Camera {
    glm::vec3 target{0.0f};
    float yaw = 0.0f;           // radians; 0 looks toward -Z
    float pitch = 0.56f;        // radians below horizon
    float distance = 17.0f;
    float fovY = 0.52f;         // radians (~30 deg)
    float nearPlane = 0.5f;
    float farPlane = 250.0f;

    glm::vec3 forward() const;  // unit vector camera -> target
    glm::vec3 position() const { return target - forward() * distance; }
    glm::vec3 right() const;    // horizontal right vector
    glm::mat4 view() const;
    glm::mat4 projection(float aspect) const;
    // Projects `world` to window pixels (top-left origin) of a `viewportPx`
    // viewport, using view() and projection(viewportPx.x / viewportPx.y).
    // Returns false (outPx untouched) when the point is behind the camera.
    bool worldToScreen(const glm::vec3& world, glm::vec2 viewportPx, glm::vec2& outPx) const;
};

}  // namespace hd2d