#ifndef NTX_UNDO_STACK_H
#define NTX_UNDO_STACK_H

#include <ntxicommand.h>
#include <vector>
#include <functional>

namespace ntx
{

  class NtxUndoStack
  {
  public:

    NtxUndoStack();
    ~NtxUndoStack() = default;

    NtxUndoStack(const NtxUndoStack&) = delete;
    NtxUndoStack& operator=(const NtxUndoStack&) = delete;

    void push(NtxCommandUPtr command);
    
    bool canUndo() const;
    bool canRedo() const;
    
    void undo();
    void redo();
    
    int index() const;
    int count() const;
    
    NtxString undoText() const;
    NtxString redoText() const;
    
    void clear();
    void setClean();
    bool isClean() const;
    
    void setUndoLimit(int limit);
    int undoLimit() const;
    
    const NtxICommand* command(int index) const;

  private:

    std::vector<NtxCommandUPtr> m_commands;
    int m_index;
    int m_cleanIndex;
    int m_undoLimit;

    void checkUndoLimit();
  };

} // namespace ntx

#endif // NTX_UNDO_STACK_H