#include <WiFi.h>
#include <WiFiUdp.h>
#include <NTPClient.h>
#include <Adafruit_NeoPixel.h>
#include <TimeLib.h>

// ====== WiFi Credentials ======
const char* ssid     = "Airtel_arvi_6035";
const char* password = "air262829";

// ====== NeoPixel Matrix Config ======
#define LED_PIN    8        // GPIO pin connected to NeoPixel DIN
#define LED_WIDTH  32
#define LED_HEIGHT 8
#define NUMPIXELS  (LED_WIDTH * LED_HEIGHT)

Adafruit_NeoPixel matrix(NUMPIXELS, LED_PIN, NEO_GRB + NEO_KHZ800);

// ====== NTP Client ======
WiFiUDP ntpUDP;
NTPClient timeClient(ntpUDP, "pool.ntp.org", 19800, 60000); 
// 19800 seconds = +5:30 offset for IST

// ====== Matrix Mapping (serpentine layout assumed) ======
int XY(int x, int y) {
  if (y % 2 == 0) {
    return y * LED_WIDTH + x;
  } else {
    return y * LED_WIDTH + (LED_WIDTH - 1 - x);
  }
}

// ====== Draw Digit (simple 5x7 font) ======
const byte font5x7[][5] = {
  {0x7E,0x81,0x81,0x81,0x7E}, // 0
  {0x00,0x82,0xFF,0x80,0x00}, // 1
  {0xE2,0x91,0x91,0x91,0x8E}, // 2
  {0x42,0x89,0x89,0x89,0x76}, // 3
  {0x1C,0x12,0x11,0xFF,0x10}, // 4
  {0x4F,0x89,0x89,0x89,0x71}, // 5
  {0x7E,0x89,0x89,0x89,0x72}, // 6
  {0x01,0xF1,0x09,0x05,0x03}, // 7
  {0x76,0x89,0x89,0x89,0x76}, // 8
  {0x4E,0x91,0x91,0x91,0x7E}  // 9
};

void drawDigit(int digit, int xOffset, int yOffset, uint32_t color) {
  for (int col = 0; col < 5; col++) {
    byte line = font5x7[digit][col];
    for (int row = 0; row < 7; row++) {
      if (line & (1 << row)) {
        int px = xOffset + col;
        int py = yOffset + row;
        if (px >= 0 && px < LED_WIDTH && py >= 0 && py < LED_HEIGHT) {
          matrix.setPixelColor(XY(px, py), color);
        }
      }
    }
  }
}

// ====== Setup ======
void setup() {
  Serial.begin(115200);
  matrix.begin();
  matrix.clear();
  matrix.show();

  WiFi.begin(ssid, password);
  while (WiFi.status() != WL_CONNECTED) {
    delay(500);
    Serial.print(".");
  }
  Serial.println("WiFi connected");

  timeClient.begin();
}

// ====== Loop ======
void loop() {
  timeClient.update();

  int hours = timeClient.getHours();
  int minutes = timeClient.getMinutes();

  matrix.clear();

  // Draw HH:MM
  drawDigit(hours / 10, 0, 0, matrix.Color(0, 255, 0));
  drawDigit(hours % 10, 6, 0, matrix.Color(0, 255, 0));

  // Colon
  matrix.setPixelColor(XY(12, 2), matrix.Color(255, 0, 0));
  matrix.setPixelColor(XY(12, 4), matrix.Color(255, 0, 0));

  drawDigit(minutes / 10, 15, 0, matrix.Color(0, 0, 255));
  drawDigit(minutes % 10, 21, 0, matrix.Color(0, 0, 255));

  matrix.show();
  delay(1000);
}