#include <SPI.h>
#include <Adafruit_GFX.h>
#include <Adafruit_PCD8544.h>

// LCD pin connections (DO NOT CHANGE – matches circuit)
Adafruit_PCD8544 display = Adafruit_PCD8544(7, 6, 5, 4, 3);

#define clk 7
#define RST 3
#define ce 4
#define dc 5
#define din 6
// Time variables
int h = 5;        // Hour (starts at 12)
int m = 20;         // Minute
int s = 0;         // Second

int flag = 0;      // AM/PM tracking counter

// Time set button pins
const int hs = 8;  // Hour set button
const int ms = 9;  // Minute set button

// Button states
int state1;
int state2;

void setup()
{
  // Initialize LCD
  display.begin();
  display.setContrast(50);
  display.clearDisplay();

  // Button inputs
  pinMode(hs, INPUT);
  pinMode(ms, INPUT);
}

void loop()
{
  // Increase seconds every loop (1 second delay below)
  s = s + 1;

  // Clear display buffer
  display.clearDisplay();

  // Display hours and minutes
  display.setTextSize(1);
  display.setCursor(10, 5);
  display.print(h);
  display.print(":");
  display.print(m);

  // Display seconds
  display.setTextSize(1);
  display.print(":");
  display.print(s);

  // Display AM / PM
  display.setTextSize(1);
  display.setCursor(10, 20);

  if (flag < 12)       display.println("AM");
  else                display.println("PM");

  if (flag == 24) flag = 0;

  // Message line
  display.setTextSize(1);
  display.setCursor(10, 35);
  display.print("arvind");

  // Push data to LCD
  display.display();

  // 1 second delay
  delay(1000);

  // Seconds rollover
  if (s == 60)
  {
    s = 0;
    m = m + 1;
  }

  // Minutes rollover
  if (m == 60)
  {
    m = 0;
    h = h + 1;
    flag = flag + 1;
  }

  // Hour rollover (12-hour format)
  if (h == 13)
  {
    h = 1;
  }

  // ----------- Time Setting Section ----------- //

  // Hour set button
  state1 = digitalRead(hs);
  if (state1 == HIGH)
  {
    h = h + 1;
    flag = flag + 1;

    if (h == 13) h = 1;
    if (flag == 24) flag = 0;

    delay(300); // simple debounce
  }

  // Minute set button
  state2 = digitalRead(ms);
  if (state2 == HIGH)
  {
    s = 0;
    m = m + 1;

    if (m == 60) m = 0;

    delay(300); // simple debounce
  }
}