/*
  Rui Santos
  Complete project details at https://RandomNerdTutorials.com/esp8266-nodemcu-date-time-ntp-client-server-arduino/

  Permission is hereby granted, free of charge, to any person obtaining a copy
  of this software and associated documentation files.

  The above copyright notice and this permission notice shall be included in all
  copies or substantial portions of the Software.
*/

#include <ESP8266WiFi.h>
#include <NTPClient.h>
#include <WiFiUdp.h>
#include <Wire.h>
#include <Adafruit_GFX.h>
#include <Adafruit_SSD1306.h>
#include<Fonts/FreeSerif9pt7b.h>
#define SCREEN_WIDTH 128 // OLED display width, in pixels
#define SCREEN_HEIGHT 64 // OLED display height, in pixels
// Declaration for an SSD1306 display connected to I2C (SDA, SCL pins)
#define OLED_RESET -1 // Reset pin # (or -1 if sharing Arduino reset pin)
Adafruit_SSD1306 display(SCREEN_WIDTH, SCREEN_HEIGHT, &Wire, OLED_RESET);

// Replace with your network credentials
const char *ssid     = "tua rete WiFi";
const char *password = "tua password";

// Define NTP Client to get time
WiFiUDP ntpUDP;
NTPClient timeClient(ntpUDP, "pool.ntp.org");

//Week Days
String weekDays[7] = {"Domenica", "Lunedi'", "Martedi'", "Mercoledi'", "Giovedi'", "Venerdi'", "Sabato"};

//Month names
String months[12] = {"Gennaio", "Febbraio", "Marzo", "Aprile", "Maggio", "Giugno", "Lugio", "Agosto", "Settembre", "Ottobre", "Novembre", "Dicembre"};


void resetDisplay() {
  display.clearDisplay();
  display.setCursor(0, 0);
}

void println(const char * str) {
  Serial.println(str);
  display.println(str);
  display.display();
}

void print(char * str) {
  Serial.print(str);
  display.write(str);
  display.display();
}

void setup() {
  // Initialize Serial Monitor
  Serial.begin(115200);
  Wire.pins(0, 2);

  // SSD1306_SWITCHCAPVCC = generate display voltage from 3.3V internally
  if (!display.begin(SSD1306_SWITCHCAPVCC, 0x3C)) {
    Serial.println("SSD1306 allocation failed");
    for (;;); // Don't proceed, loop forever
  }
  resetDisplay();
  display.display();
  delay(100);
  display.setTextSize(1);      // Normal 1:1 pixel scale
  display.setTextColor(SSD1306_WHITE); // Draw white text
  display.cp437(true);         // Use full 256 char 'Code Page 437' font
  // We start by connecting to a WiFi network
  println("Connecting to");
  println(ssid);
  delay(2000);

  WiFi.mode(WIFI_STA);
  WiFi.begin(ssid, password);
  while (WiFi.status() != WL_CONNECTED) {
  delay(500);
  Serial.print(".");

  //display.write(".");
  //display.display();


    resetDisplay();
    println("WiFi connected");
    println(WiFi.localIP().toString().c_str());
    display.display();
    delay(3000);
    resetDisplay();
  }

  // Initialize a NTPClient to get time
  timeClient.begin();
  // Set offset time in seconds to adjust for your timezone, for example:
  // GMT +1 = 3600
  // GMT +8 = 28800
  // GMT -1 = -3600
  // GMT 0 = 0
  //timeClient.setTimeOffset(3600);    //attivare questa riga con l'ora solare
  timeClient.setTimeOffset(3600 + 3600); //attivare questa riga con l'ora legale
}

void loop() {
  timeClient.update();

  time_t epochTime = timeClient.getEpochTime();
  Serial.print("Epoch Time: ");
  Serial.println(epochTime);

  String formattedTime = timeClient.getFormattedTime();
  Serial.print("Formatted Time: ");
  Serial.println(formattedTime);

  int currentHour = timeClient.getHours();
  Serial.print("Hour: ");
  Serial.println(currentHour);

  int currentMinute = timeClient.getMinutes();
  Serial.print("Minutes: ");
  Serial.println(currentMinute);
  display.print(":");

  int currentSecond = timeClient.getSeconds();
  Serial.print("Seconds: ");
  Serial.println(currentSecond);
  display.print(":");

  String weekDay = weekDays[timeClient.getDay()];
  Serial.print("Week Day: ");
  Serial.println(weekDay);

  //Get a time structure
  struct tm *ptm = gmtime ((time_t *)&epochTime);

  int monthDay = ptm->tm_mday;
  Serial.print("Month day: ");
  Serial.println(monthDay);

  int currentMonth = ptm->tm_mon + 1;
  Serial.print("Month: ");
  Serial.println(currentMonth);

  String currentMonthName = months[currentMonth - 1];
  Serial.print("Month name: ");
  Serial.println(currentMonthName);

  int currentYear = ptm->tm_year + 1900;
  Serial.print("Year: ");
  Serial.println(currentYear);

  //Print complete date:
  String currentDate =  String(monthDay)  + "/" + String(currentMonth) + "/" + String(currentYear)   ;
  Serial.print("Current date: ");
  Serial.println(currentDate);
  Serial.println("");
  
  resetDisplay();
  //display.display();
  delay(100);
  display.setFont(&FreeSerif9pt7b);
  display.setCursor(10,14);
  display.setTextColor(SSD1306_WHITE); // Draw white text
  display.cp437(true);
  display.println(currentDate);
  display.setCursor(10,32); 
  display.println(weekDay);
  display.setCursor(10,52); 
  display.println(formattedTime); 
  display.display();
  delay(1000);
}