#ifndef DMM_HID_H_
#define DMM_HID_H_

#include <mutex>
#include <string>
#include <vector>

constexpr int DMM_TIMEOUT_MS = 100;

struct Reading
{
	enum reading_type
	{
		reading_continuity,
		reading_diode,
		reading_percent,
		reading_volts,
		reading_amps,
		reading_ohms,
		reading_hFE,
		reading_hertz,
		reading_farads,
		reading_celsius,
		reading_fahrenheit,
		reading_type_max
	};

	uint8_t value[4];
	int8_t modifier;
	uint8_t dot_pos;
	bool is_inf;
	bool is_neg;
	bool is_DC;
	bool is_rel;
	bool is_hold;
	bool is_min;
	bool is_max;
	reading_type type;
};

class DMM_HID
{
private:
	// File descriptor to DMM device
	int m_fd;

	std::mutex m_mutex;

public:
	DMM_HID();
	~DMM_HID();

	// Opens the dev file and prepares to get readings
	// Returns true on success, false on failure
	void Open(const std::string& dev);

	// Closes the dev file
	void Close();

	bool is_open();

	// Returns all readings since opening or since last call
	std::vector<Reading> get_readings(int timeout_ms = DMM_TIMEOUT_MS);

	// Returns all devpaths to DMM devices
	static std::vector<std::string> get_dmm_devices();

	// Locks the mutex
	void lock();

	// Unlocks the mutex
	void unlock();
};

#endif // DMM_H_