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#ifndef SPINE_SKELETONTWOCOLORBATCH_H_
#define SPINE_SKELETONTWOCOLORBATCH_H_

#include "cocos2d.h"
#if COCOS2D_VERSION >= 0x00040000

#include "renderer/backend/ProgramState.h"
#include <spine/spine.h>
#include <vector>

namespace spine {
	struct V3F_C4B_C4B_T2F {
		cocos2d::Vec3 position;
		cocos2d::Color4B color;
		cocos2d::Color4B color2;
		cocos2d::Tex2F texCoords;
	};

	struct TwoColorTriangles {
		V3F_C4B_C4B_T2F *verts;
		unsigned short *indices;
		int vertCount;
		int indexCount;
	};

	class SP_API TwoColorTrianglesCommand : public cocos2d::CustomCommand {
	public:
		TwoColorTrianglesCommand();

		~TwoColorTrianglesCommand();

		void init(float globalOrder, cocos2d::Texture2D *texture, cocos2d::backend::ProgramState *programState, cocos2d::BlendFunc blendType, const TwoColorTriangles &triangles, const cocos2d::Mat4 &mv, uint32_t flags);

		void updateCommandPipelineDescriptor(cocos2d::backend::ProgramState *programState);

		inline cocos2d::backend::TextureBackend *getTexture() const { return _texture; }

		void draw(cocos2d::Renderer *renderer);

		void updateVertexAndIndexBuffer(cocos2d::Renderer *renderer, V3F_C4B_C4B_T2F *vertices, int verticesSize, uint16_t *indices, int indicesSize);

		inline uint32_t getMaterialID() const { return _materialID; }

		inline const TwoColorTriangles &getTriangles() const { return _triangles; }

		inline ssize_t getVertexCount() const { return _triangles.vertCount; }

		inline ssize_t getIndexCount() const { return _triangles.indexCount; }

		inline const V3F_C4B_C4B_T2F *getVertices() const { return _triangles.verts; }

		inline const unsigned short *getIndices() const { return _triangles.indices; }

		inline cocos2d::BlendFunc getBlendType() const { return _blendType; }

		inline const cocos2d::Mat4 &getModelView() const { return _mv; }

		void setForceFlush(bool forceFlush) { _forceFlush = forceFlush; }

		bool isForceFlush() { return _forceFlush; };

	protected:
		void generateMaterialID();
		uint32_t _materialID;


		void *_prog = nullptr;
		cocos2d::backend::TextureBackend *_texture = nullptr;
		cocos2d::backend::ProgramState *_programState = nullptr;
		cocos2d::backend::UniformLocation _locPMatrix;
		cocos2d::backend::UniformLocation _locTexture;

		cocos2d::BlendFunc _blendType;
		TwoColorTriangles _triangles;
		cocos2d::Mat4 _mv;
		bool _forceFlush;
	};

	class SkeletonTwoColorBatch {
	public:
		static SkeletonTwoColorBatch *getInstance();

		static void destroyInstance();

		void update(float delta);

		V3F_C4B_C4B_T2F *allocateVertices(uint32_t numVertices);
		void deallocateVertices(uint32_t numVertices);

		unsigned short *allocateIndices(uint32_t numIndices);
		void deallocateIndices(uint32_t numIndices);

		TwoColorTrianglesCommand *addCommand(cocos2d::Renderer *renderer, float globalOrder, cocos2d::Texture2D *texture, cocos2d::backend::ProgramState *programState, cocos2d::BlendFunc blendType, const TwoColorTriangles &triangles, const cocos2d::Mat4 &mv, uint32_t flags);

		void batch(cocos2d::Renderer *renderer, TwoColorTrianglesCommand *command);

		void flush(cocos2d::Renderer *renderer, TwoColorTrianglesCommand *materialCommand);

		uint32_t getNumBatches() { return _numBatches; };

	protected:
		SkeletonTwoColorBatch();
		virtual ~SkeletonTwoColorBatch();

		void reset();

		TwoColorTrianglesCommand *nextFreeCommand();

		// pool of commands
		std::vector<TwoColorTrianglesCommand *> _commandsPool;
		uint32_t _nextFreeCommand;

		// pool of vertices
		std::vector<V3F_C4B_C4B_T2F> _vertices;
		uint32_t _numVertices;

		// pool of indices
		Vector<unsigned short> _indices;


		// VBO handles & attribute locations
		V3F_C4B_C4B_T2F *_vertexBuffer;
		uint32_t _numVerticesBuffer;
		uint32_t _numIndicesBuffer;
		unsigned short *_indexBuffer;

		// last batched command, needed for flushing to set material
		TwoColorTrianglesCommand *_lastCommand = nullptr;

		// number of batches in the last frame
		uint32_t _numBatches;
	};
}// namespace spine

#endif

#endif// SPINE_SKELETONTWOCOLORBATCH_H_