#include <DHT.h>
#include <LiquidCrystal_I2C.h>
#include <RTClib.h>

DHT dht(2, DHT22);
LiquidCrystal_I2C lcd (0x27,16,2);
RTC_DS1307 rtc;  


int temp;     // อุณหภูมฺิ
int hum;      // ความชื้น

int y;        //ปี
int m;        //เดือน
int d;        // วัน
int hr;       // ชั่วโมง
int mi;       // นาที
int s;        //วินาที

int num = 0;

int swmenu = 0;

const int buttonPin = 8;  
const int ledPin = 4;    

int ledState = HIGH;        
int buttonState;            
int lastButtonState = LOW;  

unsigned long lastDebounceTime = 0;  
unsigned long debounceDelay = 50;    

void setup() {
Serial.begin(115200);
dht.begin();
lcd.init();
lcd.backlight();

rtc.begin();

pinMode(buttonPin, INPUT_PULLUP);
pinMode(ledPin, OUTPUT);

digitalWrite(ledPin, ledState);

}// end setup


void loop() {
  millisw();
  //int sw = digitalRead(8);
  
  /*
  if(sw == 0){
    swmenu = !swmenu +1;
    lcd.clear();
  }

  if(swmenu == 0){
    time();
  }
  if(swmenu == 1){
    dhtsensor();
  }
  if (swmenu == 2) {
    text();
  }
  if (swmenu >= 3) {
    swmenu = 0;
  }*/

  ///Serial.print("swmenu");
  ///Serial.println(swmenu);
  //Serial.print("sw");
  //Serial.println(sw);
}// end loop
////////////////

void time (){      ///ชุดวัน-เวลา-ทำงาน
DateTime now = rtc.now();
y = now.year();
m = now.month();
d = now.day();
hr = now.hour();
mi= now.minute(); 
s = now.second ();


///delay(2000);
  Serial.print("Current time: ");
  Serial.print(d);
  Serial.print('/');
  Serial.print(m);
  Serial.print('/');
  Serial.print(y);
  Serial.print("  hr: ");
  Serial.print(hr);
  Serial.print(':');
  Serial.print(mi);
  Serial.print(':');
  Serial.print(s);
  Serial.println();

lcd.setCursor(0,0);  //row , colum
lcd.print("Date:");
if (d < 10) {
  lcd.print (0);  
}
lcd.print(d); 
lcd.print("/");
if (m < 10) {
  lcd.print (0);
}
lcd.print(m);
lcd.print("/");
lcd.print(y+543);
lcd.print(" ");

lcd.setCursor(0,1);  //row , colum
lcd.print("Time:");
if (mi < 10) {
  lcd.print (0);  
}
lcd.print(hr);
lcd.print(":");
if (mi < 10) {
  lcd.print (0);  
}
lcd.print(mi);
lcd.print(":");
if (s < 10) {
  lcd.print (0);  
}
lcd.print(s);
lcd.print(" ");

}

void dhtsensor() {                 ///ชุดsenser ทำงาน
  int t = dht.readTemperature();  /// อุณหภูมิ
  int h = dht.readHumidity();     /// ความชื้น

  lcd.setCursor (0,0);
  lcd.print("Temp : ");
  lcd.print(t);

  lcd.setCursor (0,1);
  lcd.print("Hum : ");
  lcd.print(h);


}

void text (){
  lcd.setCursor (0,0);
  lcd.print("Hello World");
}

void millisw(){

 int sw = digitalRead(buttonPin);

  if (sw != swmenu) {
    // reset the debouncing timer
    lastDebounceTime = millis();
  }

  if ((millis() - lastDebounceTime) > debounceDelay) {
  
    if (sw != buttonState) {
      buttonState = sw;

    if (buttonState == HIGH) {
        ledState = !ledState;
        num = num + 1;
        lcd.clear();
      }
    }
  }

////set the LED
  digitalWrite(ledPin, ledState);
  if (num == 1 ){
    time();
  }
  if (num == 2 ){
    dhtsensor();
  }
  if (num == 3 ){
    text();
  }

  swmenu = sw;
  Serial.println(num);
  if(num > 3 ){
    num = 1;
  }
}