#include <SmingCore.h>
#include <Libraries/ITEADLIB_Arduino_Nextion/Nextion.h>

#define GPIO_LED 2

// See this example in action: https://youtu.be/lHk6fqDBHyI
// The HMI file included in this example needs to be compiled
// with the Nextion Editor and uploaded to the Nextion display
// using standard method.
// On WEMOS mini D1 (where this example was tested), the
// Nextion device is connected to RX/TX pins as required.
// BUT it needs to be disconnected when uploading the firmware.
// So the process is:
// 1. Make changes to the cpp code
// 2. Build it using "make"
// 3. Disconnect the Nextion display if it is connected to Rx/Tx.
// 4. Upload firmware (built in step 2) using "make flash".
// 5. Connect Nextion display back again to Rx/Tx.
// Note: I always unplugged the ESP8266 from USB (connecting with computer)
//       while fiddling with the connections between ESP8266 and Nextion display.

namespace
{
NexButton b0(0, 1, "b0");
NexText t0(0, 2, "g0");
NexTouch* nex_listen_list[] = {&b0, NULL};
SimpleTimer timerNextion;

void loopNextion()
{
	nexLoop(nex_listen_list);
}

void b0PopCallback(void* ptr)
{
	static bool ledState = true;

	digitalWrite(GPIO_LED, ledState);
	// state == false => on
	// state == true  => off
	if(!ledState) {
		t0.setText("ESP8266 says: LED is on");
	} else {
		t0.setText("ESP8266 says: LED is off");
	}
	ledState = !ledState;
}

} // namespace

void init()
{
	pinMode(GPIO_LED, OUTPUT);
	nexInit();
	b0.attachPop(b0PopCallback, &b0);
	timerNextion.initializeMs<100>(loopNextion).start();
}