//////////////////////////////////////////////////////////////////////////////
//主要功能: Undo and Redo的全局操作函数，为了区分符号修改与文件修改的Redo/Undo
//
//程序编写:		2006-12-07
/////////////////////////////////////////////////////////////////////////////

#if !defined(UNDOMANAGER_H)
#define UNDOMANAGER_H

#if _MSC_VER >= 1000
#pragma once
#endif // _MSC_VER >= 1000

#ifdef _MSC_VER
#pragma warning(disable:4786)
#endif

#include <deque>
#include <vector>
#include "UMString.h"

namespace NAction
{

/**
 * Action 详情
 */
struct ActionDetail
{
	std::string uuid;
	std::string classType;
	std::string createAt;
};

class CAction;
class CActionManager
{
public:
	enum StackKind 
	{ 
		UNDO, 
		REDO 
	};
public:
	CActionManager(void *actionTarget);
	virtual ~CActionManager();
	void RemoveLastAction();
	void ClearTarget();
	long GetStackCapacity() const;
	void SetStackCapacity(long capacity);
	void SetLastAction(CAction *itsLastAction);
	const UMString & GetActionName(StackKind kind, long pos) const;
	long  GetStackSize(StackKind kind) const;
	virtual int Undo(long nActions = 1);
	virtual bool CanUndo(long nActions = 1) const;
	virtual int Redo(long nActions = 1);
	virtual bool CanRedo(long nActions = 1) const;
	void *  GetTarget() const;
	void	TargetCleaned();

	void SavePostion();
	bool IsModified();

	// we use a deque so that we can pop off both ends
	// (e.g., off the bottom during overflow) and so we
	// can access all actions, say when building an undo
	// menu, rather than just the top; also note that we
	// push onto the back (like you would with a vector)
	typedef std::deque<CAction *> ActionStack;

	const ActionStack& GetUndoStack() const;

	const ActionStack& GetRedoStack() const;

	/**
	 * 列出 * Action 清单
	 * 
	 * \return 
	 */
	std::vector<ActionDetail> ListActionDetails() const;

	/**
	 * 恢复到指定 action，如果为 uuid 为空，表示恢复到原图件
	 * 
	 * \param uuid
	 */
	void RestoreToTargetAction(const std::string& targetUUID);

protected:
	virtual void DeleteActions(ActionStack &aStack, long nActions);
	//virtual void NotifyTarget(UINT operation, long nActions);
	void * actionTarget;
	ActionStack undoStack, redoStack;
	long cleanMarker;
	long capacity;
	CAction* m_pSavedAction;

private:
	/**
	 * 判断指定 uuid 的 Action 是否在 undo 栈中
	 * 
	 * \param uuid
	 * \return 
	 */
	bool InUndoStack(const std::string& uuid) const;

	/**
	 * 判断指定 uuid 的 Action 是否在 redo 栈中
	 * 
	 * \param uuid
	 * \return 
	 */
	bool InRedoStack(const std::string& uuid) const;
};
} //end namespace
#endif