#include <Keypad.h>
#include <LiquidCrystal.h>

const byte ROW_NUM = 4;
const byte COLUMN_NUM = 4;

char keys[ROW_NUM][COLUMN_NUM] = {
  {'1', '2', '3', 'A'},
  {'4', '5', '6', 'B'},
  {'7', '8', '9', 'C'},
  {'*', '0', '#', 'D'}
};

byte pin_rows[ROW_NUM] = {9, 8, 7, 6};
byte pin_column[COLUMN_NUM] = {5, 4, 3, 2};

Keypad keypad = Keypad( makeKeymap(keys), pin_rows, pin_column, ROW_NUM, COLUMN_NUM );

const int rs = 12, en = 11, d4 = 10, d5 = A5, d6 = A4, d7 = A3;
LiquidCrystal lcd(rs, en, d4, d5, d6, d7);

float height_ft = 0.0;
float weight = 0.0;
bool heightEntered = false;
bool weightEntered = false;

void setup() {
  lcd.begin(16,2);
  lcd.clear();
  lcd.print("NCSM WELCOMES U");
  delay(1000);
}

void loop() {
  lcd.clear();
  if (!heightEntered) {
    lcd.print("Enter height (ft):");
    lcd.setCursor(0, 1); // Move cursor to the second line
    lcd.print(height_ft); // Print the current height
  } else if (!weightEntered) {
    lcd.print("Enter weight (kg):");
    lcd.setCursor(0, 1); // Move cursor to the second line
    lcd.print(weight); // Print the current weight
  } else {
    calculateBMI();
    delay(2000); // Delay to display BMI result before resetting
    height_ft = 0.0; // Reset height
    weight = 0.0; // Reset weight
    heightEntered = false; // Reset heightEntered flag
    weightEntered = false; // Reset weightEntered flag
  }

  char key = keypad.getKey();
  if (key) {
    if (key == '#') {
      if (!heightEntered) {
        heightEntered = true;
      } else if (!weightEntered) {
        weightEntered = true;
      }
    } else if (key == '*') {
      if (!heightEntered) {
        height_ft /= 10;
      } else if (!weightEntered) {
        weight /= 10;
      }
    } else {
      if (!heightEntered) {
        height_ft = height_ft * 10 + (key - '0');
      } else if (!weightEntered) {
        weight = weight * 10 + (key - '0');
      }
    }
  }
  delay(100);
}
void calculateBMI() {
  // Convert height from feet to meters
  float height_m = height_ft * 0.3048; // 1 foot = 0.3048 meters
  float bmi = weight / (height_m * height_m);
  
  lcd.clear();
  lcd.print("BMI: ");
  lcd.print(bmi);
  
  lcd.setCursor(0, 1); // Move cursor to the second line

  if (bmi < 18.5) {
    lcd.print("Underweight");
  } else if (bmi >= 18.5 && bmi < 25) {
    lcd.print("Fit n Fine");
  } else {
    lcd.print("Overweight");
  }
}