/*
  ESP32 + ILI9341 240x320 TFT — Digital Clock
  AI Centre Nandurbar | Arvind Patil

  Real-hardware build (Arduino IDE).
  Same logic as the Wokwi sketch — only the WiFi credentials differ.

  Libraries required (Library Manager):
    - Adafruit GFX Library
    - Adafruit ILI9341
    - Adafruit BusIO

  Wiring (adjust pins to your board if different):
    CS   -> GPIO5
    DC   -> GPIO2
    RST  -> GPIO4
    SCK  -> GPIO18
    MOSI -> GPIO23
    MISO -> GPIO19
    LED  -> 3V3
    VCC  -> 3V3
    GND  -> GND
*/

#include <SPI.h>
#include <Adafruit_GFX.h>
#include <Adafruit_ILI9341.h>
#include <WiFi.h>
#include <time.h>

#define TFT_CS   5
#define TFT_DC   2
#define TFT_RST  4

Adafruit_ILI9341 tft = Adafruit_ILI9341(TFT_CS, TFT_DC, TFT_RST);

// ---- navy/gold palette (RGB565) ----
#define COL_BG      0x0006
#define COL_PANEL   0x10A2
#define COL_GOLD    0xFEA0
#define COL_GOLD_DK 0xC5A0
#define COL_WHITE   0xFFFF
#define COL_GREY    0x8410

// ---- Set your real WiFi credentials here ----
const char* ssid     = "Airtel_air_6035";
const char* password = "air26289";

const long gmtOffset_sec = 19800;      // IST UTC+5:30
const int  daylightOffset_sec = 0;

bool timeSynced = false;
unsigned long fallbackMillisAtBoot = 0;

const char* days[]   = {"Sunday","Monday","Tuesday","Wednesday","Thursday","Friday","Saturday"};
const char* daysMr[] = {"रविवार","सोमवार","मंगळवार","बुधवार","गुरुवार","शुक्रवार","शनिवार"};
const char* mons[]   = {"Jan","Feb","Mar","Apr","May","Jun","Jul","Aug","Sep","Oct","Nov","Dec"};

String lastTimeStr = "";
String lastDateStr = "";
bool colonOn = true;

void drawFrame() {
  tft.fillScreen(COL_BG);
  tft.drawRect(6, 6, 228, 308, COL_GOLD_DK);
  tft.drawRect(8, 8, 224, 304, COL_GOLD_DK);

  tft.setTextColor(COL_GOLD);
  tft.setTextSize(2);
  tft.setCursor(28, 22);
  tft.print("AI CENTRE NANDURBAR");

  tft.drawFastHLine(16, 46, 208, COL_GOLD_DK);

  tft.setTextColor(COL_GREY);
  tft.setTextSize(1);
  tft.setCursor(70, 54);
  tft.print("DIGITAL CLOCK");
}

void drawWifiBadge() {
  int x = 176, y = 14;
  tft.fillRect(x, y, 40, 14, COL_PANEL);
  tft.setTextSize(1);
  tft.setTextColor(timeSynced ? COL_GOLD : COL_GREY);
  tft.setCursor(x + 2, y + 3);
  tft.print(timeSynced ? "NTP" : "OFF");
}

void getNowStruct(struct tm &timeinfo) {
  if (timeSynced) {
    getLocalTime(&timeinfo);
  } else {
    unsigned long elapsedSec = (millis() - fallbackMillisAtBoot) / 1000;
    time_t t = 1700000000 + elapsedSec;
    localtime_r(&t, &timeinfo);
  }
}

void drawClockFace() {
  struct tm timeinfo;
  getNowStruct(timeinfo);

  char timeBuf[9];
  snprintf(timeBuf, sizeof(timeBuf), "%02d:%02d:%02d",
           timeinfo.tm_hour, timeinfo.tm_min, timeinfo.tm_sec);
  String timeStr = String(timeBuf);
  if (!colonOn) {
    timeStr.setCharAt(2, ' ');
    timeStr.setCharAt(5, ' ');
  }

  char dateBuf[24];
  snprintf(dateBuf, sizeof(dateBuf), "%02d %s %04d",
           timeinfo.tm_mday, mons[timeinfo.tm_mon], timeinfo.tm_year + 1900);
  String dateStr = String(dateBuf);

  tft.setTextSize(4);
  if (lastTimeStr != "") {
    tft.setTextColor(COL_BG);
    tft.setCursor(18, 110);
    tft.print(lastTimeStr);
  }
  tft.setTextColor(COL_WHITE);
  tft.setCursor(18, 110);
  tft.print(timeStr);
  lastTimeStr = timeStr;

  tft.setTextSize(2);
  tft.fillRect(16, 160, 208, 40, COL_BG);
  tft.setTextColor(COL_GOLD);
  int wIdx = timeinfo.tm_wday;
  tft.setCursor(60, 162);
  tft.print(days[wIdx]);
  tft.setCursor(60, 184);
  tft.print(daysMr[wIdx]);

  if (lastDateStr != dateStr) {
    tft.fillRect(16, 214, 208, 20, COL_BG);
    tft.setTextSize(2);
    tft.setTextColor(COL_GREY);
    tft.setCursor(40, 216);
    tft.print(dateStr);
    lastDateStr = dateStr;
  }

  tft.setTextSize(1);
  tft.setTextColor(COL_GOLD_DK);
  tft.setCursor(58, 290);
  tft.print("Arvind Patil / Ysz4");

  drawWifiBadge();
}

void connectWiFi() {
  WiFi.begin(ssid, password);
  unsigned long start = millis();
  while (WiFi.status() != WL_CONNECTED && millis() - start < 15000) {
    delay(250);
  }
  if (WiFi.status() == WL_CONNECTED) {
    configTime(gmtOffset_sec, daylightOffset_sec, "pool.ntp.org", "time.nist.gov");
    struct tm timeinfo;
    if (getLocalTime(&timeinfo, 5000)) {
      timeSynced = true;
    }
  }
  if (!timeSynced) {
    fallbackMillisAtBoot = millis();
  }
}

void setup() {
  Serial.begin(115200);
  tft.begin();
  tft.setRotation(0);
  drawFrame();
  connectWiFi();
}

unsigned long lastTick = 0;

void loop() {
  if (millis() - lastTick >= 500) {
    colonOn = !colonOn;
    drawClockFace();
    lastTick = millis();
  }
}