#include <WiFi.h>
#include "time.h" 
#include "SPI.h" 
#include "TFT_eSPI.h" 
TFT_eSPI tft = TFT_eSPI();

unsigned long prev = 0;
int prev_mday;

const char* ssid = "Wokwi-GUEST";
const char* password = "";

const char* ntpServer = "pool.ntp.org";
const long gmtOffset_sec = 3600*9;
const int daylightOffset_sec = 0;

void setup() {
  Serial.begin(115200);
  tft.begin();
  tft.setRotation(3); // 0~3
  tft.fillScreen(TFT_BLACK);
  
  Serial.printf("Connecting to %s ", ssid);
  WiFi.begin(ssid, password);
  while (WiFi.status() != WL_CONNECTED) {
    delay(500);
    Serial.print(".");
    }
    Serial.println("CONNECTED");
    configTime(gmtOffset_sec, daylightOffset_sec, ntpServer);
    printLocalTime();
    
    WiFi.disconnect(true);
    WiFi.mode(WIFI_OFF);
}

void loop() {
  unsigned long now = millis();
  if (now - prev > 1000) {
    prev = now;
    printLocalTime();
    }
}

void printLocalTime() {
  struct tm timeinfo;
  if (!getLocalTime(&timeinfo)) {
    Serial.println("Failed to obtain time");
    return;
    }
    Serial.println(&timeinfo, "%A, %B %d %Y %H:%M:%S");
    
    if (prev_mday != timeinfo.tm_mday) {
      prev_mday = timeinfo.tm_mday;
      tft.fillScreen(TFT_BLACK);
      }
      
      tft.setTextSize(3);
      tft.setCursor(20, 30);
      tft.setTextColor(TFT_YELLOW);
      tft.print(&timeinfo, "%B %d %Y"); // May 15 2023
      tft.setTextSize(3);
      tft.setCursor(60, 80);
      tft.setTextColor(TFT_CYAN);
      tft.println(&timeinfo, "%A"); // Monday
      
      tft.fillRect(39, 149, 240, 40, ILI9341_BLACK);
      tft.setTextSize(5);
      tft.setCursor(40, 150);
      tft.setTextColor(TFT_GREEN);
      tft.println(&timeinfo, "%H:%M:%S"); // 10:30:05
}