#pragma once

#include <cstdint>
#include <string>
#include <vector>

namespace fgc {

// Thin RAII wrapper around a Linux I2C device node (/dev/i2c-N), talking to
// one fixed slave address via the kernel i2c-dev ioctl interface. Generic
// (not sensor-specific) so any future I2C device reuses it.
class I2cBus {
public:
    I2cBus(std::string device, uint8_t addr);
    ~I2cBus();

    I2cBus(const I2cBus&) = delete;
    I2cBus& operator=(const I2cBus&) = delete;

    // Opens the device node and binds the slave address. Returns false on failure.
    bool open();
    void close();
    bool isOpen() const { return fd_ >= 0; }

    // Writes `tx`, then (if `rx` is non-empty) reads into it. Combined so a
    // single call can do "write command, read reply". Returns false on any I/O
    // error.
    bool writeRead(const std::vector<uint8_t>& tx, std::vector<uint8_t>& rx);
    bool write(const std::vector<uint8_t>& tx);

private:
    std::string device_;
    uint8_t     addr_;
    int         fd_ = -1;
};

}  // namespace fgc