#ifndef CSERIALPORT_SERIALPORT_H
#define CSERIALPORT_SERIALPORT_H

#include <cstdint>
#include <cstring>

namespace itas109 {

enum class Parity {
    ParityNone  = 0,
    ParityOdd   = 1,
    ParityEven  = 2,
};

enum class DataBits {
    DataBits5 = 5,
    DataBits6 = 6,
    DataBits7 = 7,
    DataBits8 = 8,
};

enum class StopBits {
    StopOne     = 1,
    StopOneAndHalf = 3,
    StopTwo     = 2,
};

enum class FlowControl {
    FlowNone     = 0,
    FlowHardware = 1,
    FlowSoftware = 2,
};

class CSerialPort {
public:
    CSerialPort();
    ~CSerialPort();

    // 初始化串口参数（不打开）
    void init(const char* portName,
              int         baudRate    = 115200,
              Parity      parity      = Parity::ParityNone,
              DataBits    dataBits    = DataBits::DataBits8,
              StopBits    stopBits    = StopBits::StopOne,
              FlowControl flowControl = FlowControl::FlowNone,
              int         readTimeoutMs = 1000);

    // 打开串口，成功返回 true
    bool open();

    // 关闭串口
    void close();

    // 写数据，返回实际写入字节数（失败返回 -1）
    int writeData(const uint8_t* data, size_t length);

    // 读数据，返回实际读取字节数（失败返回 -1）
    int readData(uint8_t* buffer, size_t maxLength);

    // 返回最近一次错误码
    int getLastError() const { return m_lastError; }

private:
    char        m_portName[256];
    int         m_baudRate;
    Parity      m_parity;
    DataBits    m_dataBits;
    StopBits    m_stopBits;
    FlowControl m_flowControl;
    int         m_readTimeoutMs;

    int  m_fd;          // 文件描述符
    int  m_lastError;
    bool m_isOpen;

    // termios 波特率映射
    static int toBaudRate(int baud);
};

} // namespace itas109

#endif // CSERIALPORT_SERIALPORT_H