#pragma once

#include <stdint.h>

// The stopwatch of the dynamic pages, started and stopped in the web UI and Home Assistant.
// Times are millis(). Pure logic, tested in test/test_esp32.
class Stopwatch
{
public:
	void start(uint32_t now)
	{
		if (_running)
			return;
		_running = true;
		_started = now;
	}
	void stop(uint32_t now)
	{
		if (!_running)
			return;
		_before += now - _started;
		_running = false;
	}
	// Back to 0, stopped
	void reset()
	{
		_running = false;
		_before = 0;
	}
	bool running() const { return _running; }
	uint32_t elapsed(uint32_t now) const { return _before + (_running ? now - _started : 0); }

private:
	bool _running = false;
	uint32_t _started = 0;
	uint32_t _before = 0; // ms counted before the last start
};