#pragma once

#include "core/templates/vector.h"
#include "scene/3d/mesh_instance_3d.h"
class TerrainMeshGenerator;

class TerrainChunk : public MeshInstance3D {
	GDCLASS(TerrainChunk, MeshInstance3D);
	enum MeshStatusFlag {
		MESH_DIRTY,
		MESH_DISPATCHED,
		MESH_LOADED
	};
	struct MeshStatus {
		Ref<ArrayMesh> mesh;
		MeshStatusFlag flag;
	};
	static void _bind_methods();
	void generate_lod(size_t lod);
	void ready();
	void on_terrain_changed();
	void lod_generated(size_t lod);
	void process_lod();

protected:
	void _notification(int what);

public:
	void set_size(float size);
	float get_size() const;
	void set_lod0_detail(int detail);
	int get_lod0_detail() const;

private:
	Node *collisions{ nullptr };
	size_t lod_count{ 3 };
	Vector<MeshStatus> meshes{};
	int lod0_detail{ 200 };
	float max_lod_distance{ 6 };
	float size{ 200 };
	TerrainMeshGenerator *generator{ nullptr };
};