#ifndef RENDERER_H
#define RENDERER_H

#include "simulation.h"
#include "spacecraft.h"
#include "maneuver.h"
#include "raylib.h"

// Rendering state
struct RenderState {
    Camera3D camera;
    double distance_scale;    // Scale factor for distances
    double size_scale;        // Scale factor for body sizes
    int selected_body_index;  // -1 = no selection
    int selected_craft_index;  // -1 = no selection
    bool camera_target_enabled;  // Whether camera follows selected body/craft
    Vector3 camera_offset;    // Offset from target when following body
    int last_target_index;    // Tracks body or craft index (negative = spacecraft)

    Texture2D spacecraft_texture;  // Shared texture for all spacecraft
    Texture2D maneuver_textures[6]; // One per burn direction
    bool texture_loaded;
};

// Renderer initialization and cleanup
void init_renderer(int width, int height, const char* title);
void close_renderer(RenderState* render_state);

// Texture generation
Texture2D generate_spacecraft_texture();
Texture2D generate_maneuver_marker_texture(Color color);

// Texture management
void ensure_textures_loaded(RenderState* render_state);

// Angle calculation
float calculate_spacecraft_angle(Vec3 velocity, Camera3D camera);

// Camera setup and control
void setup_camera(RenderState* render_state);
void update_camera(RenderState* render_state, SimulationState* sim);
float get_initial_camera_distance(CelestialBody* body, SimulationState* sim, RenderState* render_state);

// Rendering functions
void render_body(CelestialBody* body, RenderState* render_state);
void render_spacecraft_screen_space(Spacecraft* craft, RenderState* render_state);
void render_maneuver_marker_screen_space(Spacecraft* craft, Maneuver* maneuver, RenderState* render_state);
void render_orbit(Vec3 position, Vec3 velocity, Vec3 parent_position, double parent_mass, Color orbit_color, RenderState* render_state);
Color get_body_orbit_color(CelestialBody* body);
// NOTE: needs to be called between begin_frame() and end_frame()
void render_simulation(SimulationState* sim, RenderState* render_state);
void render_child_indicators(SimulationState* sim, RenderState* render_state);
void begin_frame();
void end_frame();

// Scaling functions
Vector3 scale_position(Vec3 pos, double scale);
float scale_radius(double radius, double scale);

#endif