#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;
int hum;

int y;
int m;
int d;
int h;
int mi;
int s;

int menu = 0;

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

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

unsigned long lastDebounceTime = 0;
unsigned long debounceDelay = 100;

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

  pinMode(8, INPUT_PULLUP);
  pinMode(4, OUTPUT);
 // digitalWrite(4, ledState);

}  //////////////////end setup


void loop() {

  millis_sw();


}
/////////////////////// End Loop


void time () {
  DateTime now = rtc.now();


  y = now.year();
  m = now.month();
  d = now.day();
  h = now.hour();
  mi = now.minute();
  s = now.second();

  lcd.setCursor(0, 0);
  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("/");
  y = y + 543;
  lcd.print(y);

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

  // Serial.println(y);
  // Serial.println(m);
  // Serial.println(d);
}
///////////////// end time



void dhtsensor() {
  int t = dht.readTemperature();
  int h = dht.readHumidity();

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

  lcd.setCursor(0, 1);
  lcd.print("Humi  ");
  lcd.print(h);
}////////////////End dhtsensor


void text() {
  lcd.setCursor(0, 0);
  lcd.print("  Hello World");
  lcd.setCursor(0, 1);
  lcd.print(" Come Together");
}
////////////////End text

void millis_sw() {
  int reading = digitalRead(8);
  if (reading != lastButtonState) {
    lastDebounceTime = millis();
  }
  if ((millis() - lastDebounceTime) > debounceDelay) {
    if (reading != buttonState) {
      buttonState = reading;
      if (buttonState == HIGH) {
        menu = menu + 1;
        lcd.clear();
      }
    }
  }
    //digitalWrite(4, ledState);
  if (menu ==1) {
    time();
  }
  if (menu == 2) {
    dhtsensor();
  }
  if (menu == 3) {
    text();
  }
  if (menu >= 4) {
    menu = 0;
  }
  // save the reading. Next time through the loop, it'll be the lastButtonState:
  lastButtonState = reading;
  Serial.print("menu:");
  Serial.println(menu);
  Serial.print("reading:");
  Serial.println(reading);
}
////////////////End millis_sw