#pragma once

#include <QByteArray>
#include <QMutex>
#include <QMutexLocker>
#include <QWaitCondition>
#include "IBuffer.h"

#define MIN_FRAME_LENGTH 28

class VarBuffer : public IBuffer
{
public:
    explicit VarBuffer(unsigned long bufLength, bool readWait, bool writeWait);
    ~VarBuffer();

    unsigned short read(unsigned char* buf, unsigned short length) override;
    int            write(unsigned char* buf, unsigned short length) override;
    unsigned short GetFrameLength() override;

private:
    unsigned long m_iReadIndex;
    unsigned long m_iWriteIndex;

    unsigned char* m_pBuffer;
    unsigned long  m_iBufferLength;
    unsigned short m_iFrameLength; // 帧长

    bool m_bReadWait;
    bool m_bWriteWait;

    QWaitCondition m_condRead;
    QWaitCondition m_condWrite;

    QMutex m_mutex;
    bool   m_bIsOneCycle;

private:
    bool IsFull(unsigned short length) override;
    bool IsEmpty(unsigned short length) override;
    bool verifyFrameLength(unsigned char* buf, unsigned short length);
};