#pragma once

#include <sophia/components.hpp>
#include <sophia/math.hpp>

/**
 * The Scene panel's camera. Not part of any scene the editor edits, and never
 * saved with one.
 *
 * In 3D it orbits a pivot point at some distance; in 2D it looks straight
 * down -Z at the pivot through an orthographic projection, like a 2D game
 * camera.
 */
class EditorCamera {
 public:
  enum class Mode { Scene3D, Scene2D };

  Mode mode = Mode::Scene3D;

  // Turns around the pivot by a mouse movement in pixels. 3D only.
  void orbit(glm::vec2 pixels);
  // Moves the pivot so the scene follows a mouse movement in pixels across a
  // viewport `viewportHeight` pixels tall.
  void pan(glm::vec2 pixels, float viewportHeight);
  // Moves in (positive) or out by mouse wheel steps.
  void zoom(float steps);
  // Moves the pivot along the camera's axes: x right, y up, z backwards.
  // `direction` needn't be normalized. 3D only.
  void fly(glm::vec3 direction, float deltaTime);
  // Centers on `target`, backing off enough to see a sphere of `radius`.
  void frame(glm::vec3 target, float radius);

  sophia::TransformComponent getTransform() const;
  sophia::CameraComponent getCamera() const;

 private:
  glm::quat getRotation() const;

  glm::vec3 pivot{0.f, 0.f, 0.f};

  // 3D: looking at the pivot from in front, a little to the right and above.
  float yaw = glm::radians(30.f);
  float pitch = glm::radians(-25.f);
  float distance = 8.f;
  float fov = glm::radians(60.f);

  // 2D: world units visible from the bottom of the view to the top.
  float orthoHeight = 10.f;
};