#ifndef DJSTDLIB_GFX_SCENE_H
#define DJSTDLIB_GFX_SCENE_H

#include "../../core.h"
#include "../../vendor/raymath.h"
#include "../Mesh.h"
#include "../Texture.h"

DefineList(int32, Handle);

enum EntityFlags {
    EntityFlags_None=0,
    EntityFlags_Visible=1<<0,
    EntityFlags_Dead=1<<1,
    EntityFlags_Render=1<<2,
};

typedef struct Entity Entity;
struct Entity {
    int32 graphNodeHandle;
    uint64 flags;
    Vec4 color;
    Mesh *mesh;
    Texture *tex;

    // Free list
    int32 next;
};
DefineList(Entity, Entity);

typedef struct SceneGraphNode SceneGraphNode;
struct SceneGraphNode {
    Matrix local;
    Matrix world;
    Vec3 translation;
    Quaternion rotation;
    Vec3 scale;
    int32 entityHandle;
    int32 parentHandle;

    /** Next free in the free list */
    int32 next;

    /** Next child in child list in scene hierarchy */
    int32 nextSibling;
    int32 firstChild;
};
DefineList(SceneGraphNode, SceneGraphNode);

typedef struct Scene Scene;
struct Scene {
    int32 sceneRoot;
    EntityList entities;
    int32 nextFreeEntity;
    /** @internal */
    SceneGraphNodeList graphNodes;
    int32 nextFreeNode;
};

int32 createEntity(Scene *s);
Entity *getEntity(Scene *s, int32 id);
SceneGraphNode *getSceneGraphNode(Scene *s, int32 id);
int32 createSceneGraphNode(Scene *s);
Scene createScene(Arena *arena);
void initGraphNode(SceneGraphNode *n);
void recalcSceneGraphNode(Scene *s, int32 parentHandle);
void recalcScene(Scene *s);
void removeEntity(Scene *s, int32 entityHandle);
void removeSceneGraphNode(Scene *s, int32 graphNodeHandle);
void sceneNodeAddNode(Scene *s, int32 recipientNodeHandle, int32 graphNodeHandle);
SceneGraphNode *getSceneGraphNodeForEntity(Scene *s, int32 entityHandle);
void show(Scene *s, uint32 graphNodeHandle);
void hide(Scene *s, uint32 graphNodeHandle);

#endif