/*!
 * @file shell_buffer.h
 * @brief The Shell buffer Tasks
*/

#ifndef _SHELL_BUFFER_H
#define _SHELL_BUFFER_H

#include <stdarg.h>

#define      SHELL_BUFFER_SIZE       16384         //!< The Size of the input-buffers (should be large enough to carry any kind of input)

// FORWARD DECLARATION
template<class T> class tList;
template<class T> class tIterator;
#ifndef NULL
#define NULL 0            //!< a pointer to NULL
#endif

//! A class for ...
class ShellBuffer {

 public:
  virtual ~ShellBuffer();
  /** @returns a Pointer to the only object of this Class */
  inline static ShellBuffer* getInstance() { if (!ShellBuffer::singletonRef) ShellBuffer::singletonRef = new ShellBuffer();  return ShellBuffer::singletonRef; };
  /** @returns true if this class is instanciated, false otherwise */
  inline static bool isInstanciated() { return (ShellBuffer::singletonRef == NULL)?true:false; };

  // BUFFER //
  /** @param bufferSize the new Buffer-Size */
  void setBufferSize(unsigned int bufferSize) { this->bufferSize = bufferSize; };
  void flushBuffers();
  static bool addBufferLineStatic(const char* line, ...);
  void addBufferLine(const char* line, va_list arg);
  void moveBuffer(unsigned int lineCount);
// void moveBufferTo(unsigned int lineNumber);
  const char* getBufferLine(unsigned int lineNumber);
  inline tIterator<char>*  getBufferIterator() const { return bufferIterator; };

  private:
    ShellBuffer();


  private:
   static ShellBuffer*      singletonRef;                       //!< The singleton-reference to the only memeber of this class.
   unsigned int             bufferSize;                         //!< The Size of the buffer
   tList<char>*             buffer;                             //!< A list of stored char-arrays(strings) to store the history
   tIterator<char>*         bufferIterator;                     //!< An iterator for the Shells main buffer.

   char                     bufferArray[SHELL_BUFFER_SIZE];     //!< a BUFFER for fast writing
   char                     keepBufferArray[SHELL_BUFFER_SIZE]; //!< a BUFFER to have multi-non-newLine commands be copied into the shell.
   bool                     keepBuffer;                         //!< if the keepbuffer contains unfinished lines.

   unsigned long            lineCount;                          //!< how many Lines have been written out so far.
};

#endif /* _SHELL_BUFFER_H */