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

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

#define NTP_SERVER     "pool.ntp.org"
#define UTC_OFFSET     25200
#define UTC_OFFSET_DST 0

const int DHT_PIN = 15;
const char pinLedHijau = 2;
const char pinLedMerah  = 4;

unsigned long PrevMillishijau, Intervalhijau = 500;  // Interval 500mS
unsigned long PrevMillismerah, Intervalmerah = 2000;  // Interval 2000mS
unsigned long Prevmillistime, Intervaltime = 1000; // Interval 1000Ms

unsigned char pb1 = 13;
unsigned char StatePB1, Counter;

bool PB1_Pressed;
float Temp, Humd;
hw_timer_t * timer = NULL;

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 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 connect_wifi(){
  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...");
}

void IRAM_ATTR onTimer(){

   Serial.println("Timer int");
}

void IRAM_ATTR SensorPB1(){
  if (!PB1_Pressed) {
    Counter++;
    Serial.println(Counter);
    PB1_Pressed = true;
  }
}

void check_button_state(){
  if (digitalRead(pb1) == HIGH){
      PB1_Pressed = false;
  }
}

void setup() {
  Serial.begin(115200);
  LCD.init();
  LCD.backlight();
  connect_wifi();
  configTime(UTC_OFFSET, UTC_OFFSET_DST, NTP_SERVER);
  dhtSensor.setup(DHT_PIN, DHTesp::DHT22);

  pinMode(pinLedHijau, OUTPUT);
  pinMode(pinLedMerah, OUTPUT);
  pinMode (pb1, INPUT_PULLUP);
  
  timer = timerBegin(0,80,true); // core, frek, aktif
  timerAttachInterrupt(timer, &onTimer, true);
  timerAlarmWrite(timer, 2000000, true);
  timerAlarmEnable(timer);
  attachInterrupt(digitalPinToInterrupt(pb1), SensorPB1, FALLING);
}

void loop() {
  
  if (millis() - PrevMillishijau >= Intervalhijau || millis() < Intervalhijau){
    PrevMillishijau = millis();
    digitalWrite(pinLedHijau, !digitalRead(pinLedHijau));
  }

  if (millis() - PrevMillismerah >= Intervalmerah || millis() < Intervalmerah){    
    PrevMillismerah = millis();
    digitalWrite(pinLedMerah, !digitalRead(pinLedMerah));
    TempAndHumidity  data = dhtSensor.getTempAndHumidity();
    Temp = data.temperature;
    Humd = data.humidity;
    Serial.println("Temp: " + String(Temp, 2) + "°C");
    Serial.println("Humidity: " + String(Humd, 1) + "%");
    Serial.println("---");
  }

  if (millis() - Prevmillistime >= Intervaltime || millis() < Intervaltime){
       Prevmillistime = millis();
       printLocalTime();
  }
  check_button_state();
  delay(10);
}