// Forum: https://forum.arduino.cc/t/home-plant-watering-system-with-lcd-and-keypad-an-issue-with-multiple-loops/1101597
// This Wokwi project: https://wokwi.com/projects/359125199861178369

#include <Wire.h>
#include <LiquidCrystal_I2C.h>
#include <Keypad.h>
#include "millisDelay.h"                 // between double quotes for Wokwi

LiquidCrystal_I2C lcd(0x27, 16, 2);
const byte ROWS = 4;
const byte COLS = 4;
char keys[ROWS][COLS] = {
  {'1', '2', '3', 'A'},
  {'4', '5', '6', 'B'},
  {'7', '8', '9', 'C'},
  {'*', '0', '#', 'D'}
};

byte rowPins[ROWS] = {9, 8, 7, 6};
byte colPins[COLS] = {5, 4, 3, 2};
Keypad keypad = Keypad(makeKeymap(keys), rowPins, colPins, ROWS, COLS);

const int Relay = 10;
bool RelayState = HIGH;
int hoursToWater;
int wateringTime;

millisDelay mdTimer1;


void setup() {
  pinMode(Relay, OUTPUT);
  digitalWrite(Relay, HIGH);
  lcd.init();
  lcd.backlight();
  lcd.setCursor(0, 0);
  lcd.print("Hello, take care");
  lcd.setCursor(0, 1);
  lcd.print("of your plants!");
  delay(3000);
}

void loop() {
  watering_interval();
  watering_time();
  watering_loop();
}

void watering_interval() {
  lcd.clear();
  lcd.setCursor(0, 0);
  lcd.print("Interval [h]:");

  char key = keypad.getKey();

  static String firstNumber = "";

  if (key != NO_KEY) {
    if (key >= '0' && key <= '9') {
      firstNumber += key;
    }
    else if (key == '#') {
      int hoursToWater = atoi(firstNumber.c_str());
      lcd.setCursor(0, 1);
      lcd.print(hoursToWater);
      delay(3000);
      watering_time();
    }
  }
}

void watering_time() {
  lcd.clear();
  lcd.setCursor(0, 0);
  lcd.print("Watering [s]:");

  char key = keypad.getKey();

  static String secondNumber = "";

  if (key != NO_KEY) {
    if (key >= '0' && key <= '9') {
      secondNumber += key;
    }
    else if (key == '#') {
      int wateringTime = atoi(secondNumber.c_str());
      lcd.setCursor(0, 1);
      lcd.print(wateringTime);
      delay(3000);
      watering_loop();
    }
  }
}

void watering_loop()  {
  lcd.clear();
  lcd.setCursor(0, 0);
  lcd.print("Press A)");

  char key = keypad.getKey();

  if (key != NO_KEY) {
    if (key == 'A') {
      lcd.clear();
      lcd.setCursor(0, 0);
      lcd.print("Wait :)");
      int hoursToWater2 = hoursToWater * 3600000;
      mdTimer1.start(hoursToWater2);
      //delay(hoursToWater2);
      if (mdTimer1.justFinished()) {
        lcd.print("Watering!!!");
        digitalWrite(Relay, LOW);
        int wateringTime2 = wateringTime * 1000;
        delay(wateringTime2);
        digitalWrite(Relay, HIGH);
      }
    }
    else if (key == 'B') {
      int hoursToWater2 = hoursToWater * 3600000;
      delay(hoursToWater2);
      lcd.print("Watering!!!");
      digitalWrite(Relay, LOW);
      int wateringTime2 = wateringTime * 1000;
      delay(wateringTime2);
      digitalWrite(Relay, HIGH);
      watering_loop();
    }
    else if (key == 'C') {
      watering_interval();
    }
  }
}