#pragma once

#include "IFileSystem.h"
#include "IEngine.h"
#include "IShader.h"
#include "../Commands/CommandUserBase.h"


class Shader
	: public IShader
	, public CommandUserBase
{
protected:
	static const unsigned char ApplyFirstPassCommandType = 0;
	static const unsigned char NextPassCommandType = 1;

public:
	Shader(IEngine& argEngine);
	virtual ~Shader();

	virtual void LoadFromFile(const string16& argValue);

	virtual string8 get_TechniqueName() const { return m_TechniqueName; }
	virtual void set_TechniqueName(const string8& argValue);

	virtual ID3D10EffectTechnique* get_DX10Technique() const { return m_Technique; }
	virtual IInternalShader* get_InternalShader() const { return m_InternalShader; }

	virtual bool TryApplyNextPass();
	virtual void ApplyFirstPass();
	virtual uint32 get_CurrentRenderPass() const { return m_CurrentPass; }

	virtual void set_Priority(unsigned char argValue);
	virtual unsigned char get_Priority() const;
	
protected:
	virtual void Uninitialize();
	IInternalShader* CreateOrFindShader(const string16& argFileName);

	// ICommandUser
	virtual CommandExecuteResult::Enumeration ExecuteCommand(unsigned char argCommandType, ICommandBuffer& argCurrentBuffer, uint32 argCurrentPositon);
	virtual string8 get_UserName() const { return "Shader"; }

private:
	IEngine& m_Engine;

	string8 m_TechniqueName;
	uint32 m_CurrentPass;
	ID3D10EffectTechnique* m_Technique;
	IInternalShader* m_InternalShader;
	D3D10_TECHNIQUE_DESC m_TechDesc;
	unsigned char m_Priority;
};