// LCD
#include <Wire.h>
#include <LiquidCrystal_I2C.h>
#include <BigFont02_I2C.h>
// NTP
#include <ESP8266WiFi.h>
#include <time.h>

const char* ssid = "........";
const char* password = "........";
const String DAY[] = {"SUN","MON","TUE","WED","THU","FRI","SAT"};

LiquidCrystal_I2C lcd(0x27, 16, 2); //address, columns, rows
BigFont02_I2C     big(&lcd); // construct large font object, passing to it the name of our lcd object

void setup()
{
  // NTP
  Serial.begin(115200);
  Serial.setDebugOutput(true);

  WiFi.mode(WIFI_STA);
  WiFi.begin(ssid, password);
  Serial.println("\nConnecting to WiFi");
  while (WiFi.status() != WL_CONNECTED) {
    Serial.print(".");
    delay(1000);
  }

  configTime(10 * 3600, 0, "pool.ntp.org", "time.nist.gov");  // UTC + 10, no DST
  Serial.println("\nWaiting for time");
  while (!time(nullptr)) {
    Serial.print(".");
    delay(1000);
  }
  Serial.println("");
  
  
  // LCD	
  lcd.begin();
  big.begin();
  lcd.clear();
  lcd.setCursor(0,1);
  lcd.write ('  BigFont02_I2C ');
  lcd.setCursor(0,1);
  lcd.write ('  ============= ');
  delay(2000);
  lcd.clear();
}

void loop()
{
  // NTP
  time_t now = time(nullptr);
  Serial.println(ctime(&now));

  // DATE
  lcd.clear();
  struct tm *ptm = localtime(&now);
  int weekday = ptm->tm_wday;
  lcd.setCursor(0,1);
  lcd.print(DAY[weekday]);         // 0..6 -> Sun..Sat  
  big.writeint(0,3 ,ptm->tm_mday    ,2,true);  //display day of the month (1-31) value using 2 digits with leading zeros enabled starting at row 0 column 3
  big.writeint(0,10,ptm->tm_mon + 1 ,2,true);  //display month (0-11) value using 2 digits with leading zeros enabled starting at row 0 column 10
  
  delay(3000);

  // TIME
  lcd.clear();
  big.writeint(0,7,ptm->tm_min ,2,true);  // 00..59
  lcd.setCursor(6,1);
  lcd.print(".");
  lcd.setCursor(6,0);
  lcd.print(".");
  if ( ptm->tm_hour == 0 ) {
    lcd.setCursor(14,0);
    lcd.print("AM");
    big.writeint(0,0,12,2,false);   				// 0:00 to 0:59 -> 12:00 AM to 12:59 AM
  }
  if (( ptm->tm_hour != 0 ) && ( ptm->tm_hour < 12 )) {
    lcd.setCursor(14,0);
    lcd.print("AM");
    big.writeint(0,0,ptm->tm_hour,2,false);        // 1:00 to 11:59 -> 1:00 AM to 11:59 AM
  } 
  if ( ptm->tm_hour == 12 ) {
    lcd.setCursor(14,0);
    lcd.print("PM");
    big.writeint(0,0,ptm->tm_hour,2,false);        // 12:00 to 12:59 -> 12:00 PM to 12:59 PM
  } 
  if ( ptm->tm_hour > 12 ) {
    lcd.setCursor(14,1);
    lcd.print("PM");
    big.writeint(0,0,ptm->tm_hour - 12,2,false);   // 13:00 to 23:59 -> 1:00 PM to 11:59 PM
  }


  delay(10000);
}