Countimer.h

#pragma once

#ifndef COUNTIMER_H
#define COUNTIMER_H

#if defined(ARDUINO) && ARDUINO >= 100
#include <Arduino.h>
#else
#include <WProgram.h>
#endif

#define COUNTIMER_MAX_HOURS 999
#define COUNTIMER_MAX_MINUTES_SECONDS 59

typedef void(*timer_callback)(void);

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

	enum CountType
	{
		COUNT_NONE = 0,
		COUNT_UP = 1,
		COUNT_DOWN = 2
	};

	// Set up counter time(hours, minutes, seconds), count mode and function to execute if count is completed.
	void setCounter(uint16_t hours, uint8_t minutes, uint8_t seconds, CountType countType, timer_callback onComplete);

	// Set up counter time(hours, minutes, seconds) for existing timer.
	void setCounter(uint16_t hours, uint8_t minutes, uint8_t seconds);

	// Returns timer's current hours.
	uint16_t getCurrentHours();

	// Returns timer's current minutes.
	uint8_t getCurrentMinutes();

	// Returns timer's current seconds.
	uint8_t getCurrentSeconds();

	// Returns timer's current milliseconds.
	uint32_t getCurrentMilliSeconds();

	void setInterval(timer_callback callback, uint32_t interval);

	// Returns current timer as formatted string HH:MM:SS
	char* getCurrentTime();

	// Returns current timer as formatted string MM:SS.ss
	char* getCurrentTime_MMSSss();

	// Returns true if counter is completed, otherwise returns false.
	bool isCounterCompleted();

	// Returns true if counter is still running, otherwise returns false.
	bool isCounterRunning();

	// Returns true if timer is stopped, otherwise returns false.
	bool isStopped();

	// Run timer. This is main method.
	// If you want to start timer after run, you have to invoke start() method.
	void run();

	// Starting timer.
	void start();

	// Stopping timer.
	void stop();

	// Pausing timer.
	void pause();

	// Restart timer.
	void restart();

private:
	// Counting up timer.
	void countDown();
	
	void callback();
	void complete();

	// Counting down timer.
	void countUp();

	uint32_t _interval = 1;
	uint32_t _previousMillis;

	// Stores current counter value in milliseconds.
	uint32_t _currentCountTime;
	uint32_t _startCountTime;

	// Stores cached user's time.
	uint32_t _countTime;

	// Function to execute.
	timer_callback _callback;

	// Function to execute when timer is complete.
	timer_callback _onComplete;
	bool _isCounterCompleted;
	bool _isStopped;
	char _formatted_time[10];
	CountType _countType;
};

#endif