#include <WiFi.h>
#include <Wire.h>
#include <Adafruit_GFX.h>
#include <Adafruit_SSD1306.h>
#include <NTPClient.h>
#include <WiFiUdp.h>
#include <TimeLib.h>

#define SCREEN_WIDTH 128
#define SCREEN_HEIGHT 64
#define OLED_RESET -1

Adafruit_SSD1306 display(SCREEN_WIDTH, SCREEN_HEIGHT, &Wire, OLED_RESET);

#define NTP_SERVER     "pool.ntp.org"
#define UTC_OFFSET     -6
#define UTC_OFFSET_DST -5

WiFiUDP ntpUDP;
NTPClient timeClient(ntpUDP, NTP_SERVER, UTC_OFFSET * 3600);

void spinner() {
  static int8_t counter = 0;
  const char* glyphs = "\xa1\xa5\xdb";
  display.setCursor(110, 20);
  display.print(glyphs[counter++]);
  if (counter == strlen(glyphs)) {
    counter = 0;
  }
  display.display();
}

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

  if (!display.begin(SSD1306_SWITCHCAPVCC, 0x3C)) {
    Serial.println(F("Error al iniciar la pantalla OLED SSD1306"));
    for (;;);
  }

  display.clearDisplay();
  display.setTextSize(1);
  display.setTextColor(WHITE);
  display.setCursor(0, 0);
  display.println("Conectando a WiFi...");

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

  Serial.println("");
  Serial.println("WiFi conectado");
  Serial.print("Dirección IP: ");
  Serial.println(WiFi.localIP());

  display.clearDisplay();
  display.setCursor(0, 0);
  display.println("En linea");
  display.println("Obteniendo hora...");

  timeClient.begin();
  configTime(UTC_OFFSET * 3600, UTC_OFFSET_DST * 3600, "pool.ntp.org");
}

void loop() {
  timeClient.update();

  String formattedTime = timeClient.getFormattedTime();

  struct tm timeinfo;
  if(!getLocalTime(&timeinfo)){
    Serial.println("Error al obtener la hora local");
    return;
  }
  char formattedDate[20];
  strftime(formattedDate, sizeof(formattedDate), "%d/%m/%Y", &timeinfo);

  display.clearDisplay();
  display.setCursor(0, 0);
  display.println("Hora:");
  display.println(formattedTime);

  display.setCursor(0, 32);
  display.println("Fecha:");
  display.println(formattedDate);

  display.display();

  delay(1000);
}