// Sequencing counter, save count after power outage
// https://forum.arduino.cc/t/sequencing-counter-save-count-after-power-outage/1414317

const char * compiledOn = "\"" __FILE__ "\" compiled the " __DATE__ " at " __TIME__;

#include<EEPROM.h>
const int countPin =  2;
const int resetPin =  3;
const int LED0 = 13;
const int LED1 = 12;
const int LED2 = 11;
const int LED3 = 10;
const int LED4 = 9;
const int LED5 = 8;
const int LED6 = 7;
const int LED7 = 6;
const int LED8 = 5;
const int LED9 = 4;
#define nLED 10
byte LEDPinArray[nLED] = { LED0, LED1, LED2, LED3, LED4,
                           LED5, LED6, LED7, LED8, LED9
                         };

uint8_t ledIndex = 0;
int resetState = 0;
int lastResetState = 0;
int buttonState = 0;
int lastButtonState = 0;


//void initLeds
void initLeds()
{
  for (int i = 0; i < nLED; i++) {
    pinMode(LEDPinArray[i], OUTPUT);
  }
}



// void select
void Select(uint8_t index)
{
  EEPROM.put(10, index);
  Serial.print("Seleted LED index: ");
  Serial.println(index);
  for (uint8_t i = 0; i < nLED; i++) {
    // if (i == index) {
    //   digitalWrite(LEDPinArray[i], HIGH);
    // }
    // else {
    //   digitalWrite(LEDPinArray[i], LOW);
    // }
    digitalWrite(LEDPinArray[i], i == index);
  }
}

// void setup
void setup()
{
  initLeds();
  Serial.begin(115200);
  Serial.println(compiledOn);

  pinMode(countPin, INPUT);
  pinMode(resetPin, INPUT);
  EEPROM.get(10, ledIndex);
  Serial.print("Retrieved LED index: ");
  Serial.println(ledIndex);
  if (ledIndex < 0 || ledIndex >= nLED) {
    ledIndex = 0;
  }
  Serial.print("Adjuted LED index: ");
  Serial.println(ledIndex);
  Select(ledIndex);
}


//void loop
void loop()
{ // reset function
  resetState = digitalRead(resetPin);
  if (resetState != lastResetState) {
    lastResetState = resetState;
    Serial.println("Reset Btn Pressed");
    if (resetState == HIGH) {
      ledIndex = 0;
      Select(ledIndex);
    }
  }
  //button press function
  buttonState = digitalRead(countPin);
  if (buttonState != lastButtonState) {
    lastButtonState = buttonState;
    Serial.println("Count Btn Pressed");
    if (buttonState == HIGH) {
      ledIndex++;
      if (ledIndex >= nLED) {
        ledIndex = 0;
      }
      Select(ledIndex);
    }
    delay(50);
  }
}