// 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 "time.h"

char* gb_val_std_date;
char* gb_val_std_time;
//* Timer variables (send new readings every three minutes)
unsigned long sendDataPrevMillis = 0;
// unsigned long timerDelay = 180000; //3 นาที
// unsigned long timerDelay = 60000; //1 นาที
// unsigned long timerDelay = 300000; //5 นาที
// unsigned long timerDelay = 5000; //1 วินาที
//unsigned long timerDelay = 1200000; //20 วินาที
//unsigned long timerDelay = 1800000; //20 นาที

unsigned long timerDelay = 60000; //1 นาที
unsigned long sendDataPrevMillisShow = 0;
unsigned long timerDelayShow = 5000; //5 วินาที

LiquidCrystal_I2C LCD = LiquidCrystal_I2C(0x27, 16, 2);

#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 ReadSensorData()
// {
  // 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");

//   Serial.println(&timeinfo, "%H:%M:%S");
//   Serial.println("ReadSensorData");
// }
void ReadSensorData() 
{
  Serial.println(">>>ReadSensorData");
  Serial.println(gb_val_std_time);
}
void ShowData()
{
  Serial.println("****ShowData");
  Serial.println(gb_val_std_time);
}
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);
}

void loop() {
  // printLocalTime();
  // delay(250);

  struct tm timeinfo;
  if (!getLocalTime(&timeinfo)) {
    LCD.setCursor(0, 1);
    LCD.println("Connection Err");
    return;
  }
  
  char dateStringBuff[50]; //50 chars should be enough
  char timeStringBuff[50]; //50 chars should be enough

  strftime(timeStringBuff, sizeof(timeStringBuff), "%H:%M:%S", &timeinfo);
  strftime(dateStringBuff, sizeof(dateStringBuff), "%d/%m/%Y", &timeinfo);

  gb_val_std_date             = dateStringBuff;
  gb_val_std_time             = timeStringBuff;


  if (millis() - sendDataPrevMillisShow > timerDelayShow || sendDataPrevMillisShow == 0){
    sendDataPrevMillisShow  = millis(); //หน่วยของ milli-Second
    ShowData();
    //printLocalTime();
  }

  if (millis() - sendDataPrevMillis > timerDelay){
    sendDataPrevMillis  = millis(); //หน่วยของ milli-Second
    ReadSensorData();
    //printLocalTime();
  }
}