#include <Wire.h>
#include <LiquidCrystal_I2C.h>

LiquidCrystal_I2C lcd(0x27, 16, 2); // I2C address, 16x2 LCD

const int airValvePin = 8; // Digital output pin for air valve
const int airTransducerPin = A1; // Analog input pin for air transducer
const int modeTogglePin = 10; // Pin for manual/auto mode toggle switch
const int airTogglePin = 11; // Pin for air on/off toggle switch
const int encoderButtonPin = A0; // Pin for push button of rotary encoder
const int encoderDTpin = 7; // Encoder DT pin
const int encoderCLKpin = 8; // Encoder CLK pin

int mode = 0; // 0 for manual mode, 1 for auto mode
int airOn = 0; // 0 for air off, 1 for air on
int cycleCount = 0;
int pressureThreshold = 0;
int onTime = 0;
int offTime = 0;

void setup() {
  pinMode(airValvePin, OUTPUT);
  pinMode(modeTogglePin, INPUT);
  pinMode(airTogglePin, INPUT);
  
  lcd.init();
  lcd.backlight();
}

void loop() {
  if(digitalRead(modeTogglePin) == HIGH) {
        
    if(mode == LOW) {
      mode == HIGH;
      setAutoModeParameters();
    } 
}else{
    if(mode==HIGH){
      mode == LOW;
      lcd.setCursor(0,0);
      lcd.print("Manual Mode");

      lcd.setCursor(0,1);
      if(digitalRead(airTogglePin)==HIGH){
            lcd.print("Air: ON");
      }else{
            lcd.print("Air: OFF");
      }

    }
}

void setAutoModeParameters() {
  lcd.clear();
  
  int menuSelection = 0;
  
  while(menuSelection != -1) {
    switch(menuSelection) {
      case 0:
        lcd.setCursor(0,0);
        lcd.print("Enter On Time:");
        onTime = readEncoderValue();
        break;
        
      case 1:
        lcd.setCursor(0,1);
        lcd.print("Enter Off Time:");
        offTime = readEncoderValue();
        break;
        
      case 2:
        lcd.clear();
        lcd.setCursor(0,0);
        lcd.print("Enter Pressure:");
        pressureThreshold = readEncoderValue();
        break;
        
      case 3:
        menuSelection = -1; // Exit menu
        break;
    }
    
    delay(500); // Delay to avoid rapid scrolling
    menuSelection++;
    
    if(menuSelection > 3) {
      menuSelection = 0;
    }
    
    delay(500); // Debounce delay
  }
}

int readEncoderValue() {
   int val=analogRead(encoderCLKpin); 
   if(val>512)
   return val/4-128;
   else 
   return -128+val/4;
}

void startAutoMode() {
   int pressureReading = analogRead(airTransducerPin);

   if(pressureReading < pressureThreshold && airOn == HIGH) {
     digitalWrite(airValvePin, LOW); // Turn off the air
     airOn = LOW;

     cycleCount++;

     displayAutoModeInfo("Air OFF", pressureReading);

     delay(offTime * 1000); // Convert seconds to milliseconds

   } else if(pressureReading >= pressureThreshold && airOn == LOW) {
     digitalWrite(airValvePin, HIGH); // Turn on the air
     airOn = HIGH;

     cycleCount++;

     displayAutoModeInfo("Air ON", pressureReading);

     delay(onTime * 1000); // Convert seconds to milliseconds

   }
}

void displayAutoModeInfo(String status, int pressureReading) {
   lcd.clear();
   lcd.setCursor(0,0);
   lcd.print("Auto Mode");
   lcd.setCursor(0,1);
   lcd.print(status + " Pressure: " + String(pressureReading));
}