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

LiquidCrystal_I2C lcd(0x27, 20, 4);

// BUTTONS
  const int button1Pin = 2;
  const int button2Pin = 3;
  const int button3Pin = 4;
  const int button4Pin = 5;
  const int button5Pin = 6;
  const int button6Pin = 7;

// BUZZER
  const int buzzerPin = 8;

// BUTTON STATES
  bool button1State = false;
  bool button2State = false;
  bool button3State = false;
  bool button4State = false;
  bool button5State = false;
  bool button6State = false;

// LAST BUTTON STATES PARA MADETECT PRESS AND RELEASE 
  bool lastButton1State = false;
  bool lastButton2State = false;
  bool lastButton3State = false;
  bool lastButton4State = false;
  bool lastButton5State = false;
  bool lastButton6State = false;

// TONES PER BUTTON (IN HERTZ TO)
  const int toneButton1 = 1000; 
  const int toneButton2 = 1200;
  const int toneButton3 = 1400;
  const int toneButton4 = 1600; 
  const int toneButton5 = 1800; 
  const int toneButton6 = 2000; 
  
void setup() {
  // Initialize
  lcd.init();
  lcd.backlight();
  
  // INPUT-BUTTON PINS
  pinMode(button1Pin, INPUT_PULLUP);
  pinMode(button2Pin, INPUT_PULLUP);
  pinMode(button3Pin, INPUT_PULLUP);
  pinMode(button4Pin, INPUT_PULLUP);
  pinMode(button5Pin, INPUT_PULLUP);
  pinMode(button6Pin, INPUT_PULLUP);
  
  // OUTPUT-BUZZER
  pinMode(buzzerPin, OUTPUT);
  
  // SHOW STANDBY MESSAGE
  lcd.clear();
  lcd.setCursor(7, 0);
  lcd.print("HELLO!");
  lcd.setCursor(5, 1);
  lcd.print("C.A.R.E.S.");
  lcd.setCursor(1, 2);
  lcd.print("ON STANDBY MODE...");
  lcd.setCursor(3, 3);
  lcd.print("FROM STEM 1202");
}

void loop() {
  // READ BUTTON STATES
  button1State = digitalRead(button1Pin) == LOW;  // Assuming buttons are connected to ground (ACTIVE LOW)
  button2State = digitalRead(button2Pin) == LOW;
  button3State = digitalRead(button3Pin) == LOW;
  button4State = digitalRead(button4Pin) == LOW;
  button5State = digitalRead(button5Pin) == LOW;
  button6State = digitalRead(button6Pin) == LOW;

  //IF BUTTON1 PRESSED
  if (button1State && !lastButton1State) {
    lcd.clear();
    lcd.setCursor(2, 1);
    lcd.print("I need to poop.");
    lcd.setCursor(2, 2);
    lcd.print("Please assist me!");
    lcd.setCursor(9, 3);
    lcd.print("B1");
    tone(buzzerPin, toneButton1);  // PLAY TONE
  } else if (!button1State && lastButton1State) {
    //IF RELEASED, REVERT SA STANDBY MODE
    lcd.clear();
    lcd.setCursor(7, 0);
    lcd.print("HELLO!");
    lcd.setCursor(5, 1);
    lcd.print("C.A.R.E.S.");
    lcd.setCursor(1, 2);
    lcd.print("ON STANDBY MODE...");
    lcd.setCursor(3, 3);
    lcd.print("FROM STEM 1202");  // BUZZER STOP -ALWAYS ON TOP EMZ
    noTone(buzzerPin); 
  }
  
  // IF BUTTON2 PRESSED
  if (button2State && !lastButton2State) {
    lcd.clear();
    lcd.setCursor(2, 1);
    lcd.print("I need to pee.");
    lcd.setCursor(2, 2);
    lcd.print("Please come here!");
    lcd.setCursor (9, 3);
    lcd.print("B2");
    tone(buzzerPin, toneButton2);  // PLAY TONE
  } else if (!button2State && lastButton2State) {
    // IF RELEASED, REVERT SA STANDBY MODE
    lcd.clear();
    lcd.setCursor(7, 0);
    lcd.print("HELLO!");
    lcd.setCursor(5, 1);
    lcd.print("C.A.R.E.S.");
    lcd.setCursor(1, 2);
    lcd.print("ON STANDBY MODE...");
    lcd.setCursor(3, 3);
    lcd.print("FROM STEM 1202");  // BUZZER STOP
    noTone(buzzerPin); 
  }

    //IF BUTTON3 PRESSED
  if (button3State && !lastButton3State) {
    lcd.clear();
    lcd.setCursor(2, 1);
    lcd.print("I feel thirsty!");
    lcd.setCursor(2, 2);
    lcd.print("Bring me a drink.");
    lcd.setCursor(9, 3);
    lcd.print("B3");
    tone(buzzerPin, toneButton1);  // PLAY TONE
  } else if (!button3State && lastButton3State) {
    //IF RELEASED, REVERT SA STANDBY MODE
    lcd.clear();
    lcd.setCursor(7, 0);
    lcd.print("HELLO!");
    lcd.setCursor(5, 1);
    lcd.print("C.A.R.E.S.");
    lcd.setCursor(1, 2);
    lcd.print("ON STANDBY MODE...");
    lcd.setCursor(3, 3);
    lcd.print("FROM STEM 1202");  // BUZZER STOP -ALWAYS ON TOP EMZ
    noTone(buzzerPin); 
  }

    //IF BUTTON4 PRESSED
  if (button4State && !lastButton4State) {
    lcd.clear();
    lcd.setCursor(4, 1);
    lcd.print("I am hungry.");
    lcd.setCursor(0, 2);
    lcd.print("Please give me food.");
    lcd.setCursor(9, 3);
    lcd.print("B4");
    tone(buzzerPin, toneButton1);  // PLAY TONE
  } else if (!button4State && lastButton4State) {
    //IF RELEASED, REVERT SA STANDBY MODE
    lcd.clear();
    lcd.setCursor(7, 0);
    lcd.print("HELLO!");
    lcd.setCursor(5, 1);
    lcd.print("C.A.R.E.S.");
    lcd.setCursor(1, 2);
    lcd.print("ON STANDBY MODE...");
    lcd.setCursor(3, 3);
    lcd.print("FROM STEM 1202");  // BUZZER STOP -ALWAYS ON TOP EMZ
    noTone(buzzerPin); 
  }

    //IF BUTTON5 PRESSED
  if (button5State && !lastButton5State) {
    lcd.clear();
    lcd.setCursor(1, 1);
    lcd.print("I'm feeling itchy!");
    lcd.setCursor(1, 2);
    lcd.print("Help me with this.");
    lcd.setCursor(9, 3);
    lcd.print("B5");
    tone(buzzerPin, toneButton1);  // PLAY TONE
  } else if (!button5State && lastButton5State) {
    //IF RELEASED, REVERT SA STANDBY MODE
    lcd.clear();
    lcd.setCursor(7, 0);
    lcd.print("HELLO!");
    lcd.setCursor(5, 1);
    lcd.print("C.A.R.E.S.");
    lcd.setCursor(1, 2);
    lcd.print("ON STANDBY MODE...");
    lcd.setCursor(3, 3);
    lcd.print("FROM STEM 1202");  // BUZZER STOP -ALWAYS ON TOP EMZ
    noTone(buzzerPin); 
  }

    //IF BUTTON6 PRESSED
  if (button6State && !lastButton6State) {
    lcd.clear();
    lcd.setCursor(1, 1);
    lcd.print("EMERGENCY! URGENT!");
    lcd.setCursor(2, 2);
    lcd.print("Come right away!");
    lcd.setCursor(9, 3);
    lcd.print("B6");
    tone(buzzerPin, toneButton1);  // PLAY TONE
  } else if (!button6State && lastButton6State) {
    //IF RELEASED, REVERT SA STANDBY MODE
    lcd.clear();
    lcd.setCursor(7, 0);
    lcd.print("HELLO!");
    lcd.setCursor(5, 1);
    lcd.print("C.A.R.E.S.");
    lcd.setCursor(1, 2);
    lcd.print("ON STANDBY MODE...");
    lcd.setCursor(3, 3);
    lcd.print("FROM STEM 1202");  // BUZZER STOP -ALWAYS ON TOP EMZ
    noTone(buzzerPin); 
  }
//uulitin lang naman yung void setup pag dadagdagan na ng button, palitan na lang ng variable

  // UPDATE LAST BUTTON STATES
  lastButton1State = button1State;
  lastButton2State = button2State;
  lastButton3State = button3State;
  lastButton4State = button4State;
  lastButton5State = button5State;
  lastButton6State = button6State;
  
  // Small delay to avoid flickering
  delay(50);
}