// Learn about the ESP32 WiFi simulation in
// https://docs.wokwi.com/guides/esp32-wifi

#include <WiFi.h>
#include <Wire.h>
#include <LiquidCrystal_I2C.h>

#include <Adafruit_GFX.h>
#include <Adafruit_SSD1306.h>

#include <Fonts/FreeSans9pt7b.h>
#include <Fonts/FreeSansBold9pt7b.h>
#define SCREEN_WIDTH    128 // OLED display width, in pixels
#define SCREEN_HEIGHT   32 // OLED display height, in pixels
#define OLED_RESET      -1 // Reset pin # (or -1 if sharing Arduino reset pin)
#define SCREEN_ADDRESS  0x3C ///< See datasheet for Address; 0x3D for 128x64, 0x3C for 128x32

LiquidCrystal_I2C LCD = LiquidCrystal_I2C(0x27, 16, 2);
Adafruit_SSD1306 display(SCREEN_WIDTH, SCREEN_HEIGHT, &Wire, OLED_RESET);

#define NTP_SERVER     "pool.ntp.org"
#define UTC_OFFSET     0
#define UTC_OFFSET_DST 0

void spinner() {
  static int8_t counter = 0;
  const char* glyphs = "\xa1\xa5\xdb";
  LCD.setCursor(15, 1);
  LCD.print(glyphs[counter++]);
  if (counter == strlen(glyphs)) {
    counter = 0;
  }
}

void printLocalTime2() {
  display.setTextSize(2);
  display.setTextColor(WHITE);
  display.display();
  display.clearDisplay();
  
  struct tm timeinfo;

  display.setCursor(1, 1);
  display.println(&timeinfo, "%H:%M:%S");

  display.setTextSize(1);
  display.setCursor(1, 18);
  display.println(&timeinfo, "%d/%m/%Y   %Z");
}

void printLocalTime() {
  struct tm timeinfo;
  if (!getLocalTime(&timeinfo)) {
    LCD.setCursor(0, 1);
    LCD.println("Connection Err");
    return;
  }
  
  LCD.setCursor(8, 0);
  LCD.println(&timeinfo, "%H:%M:%S");

  LCD.setCursor(0, 1);
  LCD.println(&timeinfo, "%d/%m/%Y   %Z");
}

void setup() {
  Serial.begin(115200);

  LCD.init();
  LCD.backlight();
  LCD.setCursor(0, 0);
  LCD.print("Connecting to ");
  LCD.setCursor(0, 1);
  LCD.print("WiFi ");

  WiFi.begin("Wokwi-GUEST", "", 6);
  while (WiFi.status() != WL_CONNECTED) {
    delay(250);
    spinner();
  }

  Serial.println("");
  Serial.println("WiFi connected");
  Serial.print("IP address: ");
  Serial.println(WiFi.localIP());

  LCD.clear();
  LCD.setCursor(0, 0);
  LCD.println("Online");
  LCD.setCursor(0, 1);
  LCD.println("Updating time...");

  configTime(UTC_OFFSET, UTC_OFFSET_DST, NTP_SERVER);
  
  display.begin(SSD1306_SWITCHCAPVCC, 0x3C);
  display.clearDisplay();

}

void loop() {
  printLocalTime();
  printLocalTime2();
  delay(250);
}