#pragma once
#include "IBuffer.h"

#include <QByteArray>
#include <QMutex>
#include <QMutexLocker>
#include <QWaitCondition>

class ConstBuffer : public IBuffer
{
public:
    // 构造函数包含四个参数：
    // 1. 缓冲区长度
    // 2. 是否等待读数据
    // 3. 是否等待写数据
    // 4. 固定帧长度
    explicit ConstBuffer(unsigned long bufLength, bool readWait, bool writeWait,
                         unsigned short frameLength);
    ~ConstBuffer();
    int            write(unsigned char* data, unsigned short length); // 写数据
    unsigned short read(unsigned char* data, unsigned short length);  // 读数据
    void           clear();

private:
    unsigned char* m_pBuffer;
    unsigned long  m_iBufferLength; // 缓冲区长度
    unsigned short m_iFrameLength;  // 帧长

    unsigned long m_iReadIndex;  // 读索引
    unsigned long m_iWriteIndex; // 写索引

    QMutex m_mutex;
    bool   m_bIsOneCycle; // 是否在一圈内

    bool m_bReadWait;  // 读等待
    bool m_bWriteWait; // 写等待

    QWaitCondition m_condRead;
    QWaitCondition m_condWrite;

private:
    inline unsigned short GetFrameLength() override
    {
        return m_iFrameLength;
    }
    bool verifyFrameLength(unsigned char* buf, unsigned short length); // 验证帧长
    bool IsFull(unsigned short length) override;
    bool IsEmpty(unsigned short length) override;
};