/*
   8x8 NeoPixel WiFi Clock
   ESP32 + WS2812B 64 LED Matrix

   Libraries Required:
   - Adafruit NeoPixel
   - WiFi.h
   - NTPClient
   - WiFiUdp
*/

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

#define LED_PIN   6
#define LED_COUNT 64   // 8x8 matrix

Adafruit_NeoPixel strip(LED_COUNT, LED_PIN, NEO_GRB + NEO_KHZ800);

// ====== WiFi Credentials ======
const char* ssid     = "YAirtel_arv_6035";
const char* password = "air28269";

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

void setup() {
  strip.begin();
  strip.setBrightness(80);
  strip.show();

  WiFi.begin(ssid, password);
  while (WiFi.status() != WL_CONNECTED) {
    delay(500);
  }

  timeClient.begin();
}

void loop() {
  timeClient.update();

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

  // Clear matrix
  strip.clear();

  // Display HH:MM (basic demo: show digits as blocks)
  displayDigit(hours / 10, 0);   // tens of hour
  displayDigit(hours % 10, 2);   // ones of hour
  displayDigit(minutes / 10, 5); // tens of minute
  displayDigit(minutes % 10, 7); // ones of minute

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

// ====== Digit Display ======
// Each digit is drawn as a vertical bar on the matrix.
// For a real clock, replace with proper 5x7 font mapping.

void displayDigit(int num, int col) {
  uint32_t color = strip.Color(0, 150, 255);

  for (int row = 0; row < 8; row++) {
    int idx = matrixIndex(row, col);
    if (row < num) {
      strip.setPixelColor(idx, color);
    }
  }
}

// ====== Matrix Mapping ======
// Converts (row,col) to LED index depending on wiring (serpentine assumed)

int matrixIndex(int row, int col) {
  if (row % 2 == 0) {
    return row * 8 + col;
  } else {
    return row * 8 + (7 - col);
  }
}