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

int subValuelist[]={55, 25, 0};

int valueMax[]={65, 30, 0};

int valueMin[]={40, 15, 0};

String menuNamelist[]={"DO AM: ", "NHIET DO: ", "-- Luu va thoat --"};

volatile int menucount;
volatile int contro;
volatile int menu;
volatile int clkValue;
volatile int dtValue;
volatile int counter;
volatile int dir;
volatile int MIN;
volatile int MAX;
volatile int menuflag;
LiquidCrystal_I2C mylcd(0x27,20,4);
DHT dht13(13, 22);

void attachInterrupt_fun_FALLING_2() {
  checkEncoder();
  updateValue();
}

void updateValue() {
  noInterrupts();
  if (menuflag == 1) {
    if (menu == -1 && dir != 0) {
      contro = constrain(contro + dir, 0, menucount-1);

    }
    if (menu == 0 && dir != 0) {
      subValuelist[contro] = constrain(subValuelist[contro] + dir, valueMin[contro], valueMax[contro]);

    }

  }
  dir = 0;
  interrupts();
}

void checkEncoder() {
  clkValue = digitalRead(2);
  delayMicroseconds(1000);
  dtValue = digitalRead(4);
  if (clkValue != dtValue) {
    dir = 1;

  } else {
    dir = -1;

  }
}

void mainDisplay() {
  mylcd.setCursor(1-1, 1-1);
  mylcd.print(String("     ") + String("VIEN KTCGQS") + String("  "));
  mylcd.setCursor(1-1, 2-1);
  mylcd.print(String("NHIET DO: ") + String(dht13.readTemperature()) + String(" C   "));
  mylcd.setCursor(1-1, 3-1);
  mylcd.print(String("DO AM: ") + String(dht13.readHumidity()) + String(" %      "));
  mylcd.setCursor(1-1, 4-1);
  mylcd.print(String("                    "));
}

void lcdDisplay() {
  if (menu == -1) {
    mylcd.setCursor(1-1, 1-1);
    mylcd.print("    Cai thong so:   ");
    mylcd.setCursor(2-1, 2-1);
    mylcd.print(String(menuNamelist[0]) + String(subValuelist[0]) + String("        "));
    mylcd.setCursor(2-1, 3-1);
    mylcd.print(String(menuNamelist[1]) + String(subValuelist[1]) + String("  "));
    mylcd.setCursor(2-1, 4-1);
    mylcd.print(String(menuNamelist[2]) );
    for (int i = (0); i <= (menucount-1); i = i + (1)) {
      if (contro == i) {
        mylcd.setCursor(1-1, contro+2-1);
        mylcd.print(">");

      } else {
        mylcd.setCursor(1-1, i+2-1);
        mylcd.print(" ");

      }
    }

  }
  if (menu == 0 && contro < 2) {
    mylcd.setCursor(1-1, 1-1);
    mylcd.print(String("  ") + String(menuNamelist[contro]) + String(subValuelist[contro]) + String("       "));
    mylcd.setCursor(1-1, 2-1);
    mylcd.print(String("                    "));
    mylcd.setCursor(1-1, 3-1);
    mylcd.print(String("                    "));
    mylcd.setCursor(1-1, 4-1);
    mylcd.print(String("                    "));

  }
}

void attachInterrupt_fun_FALLING_3() {
  delayMicroseconds(2000);
  if (digitalRead(4) == HIGH) {
    if (menuflag == 0) {
      menuflag = 1;
      menu = -1;

    } else {
      if (menu == -1) {
        menu = 0;

      } else {
        menu = -1;

      }
      if (menu == 0 && contro == 2) {
        menuflag = 0;
        menu = -1;

      }

    }

  }
}

void setup(){
  menucount = 3;
  contro = 0;
  menu = -1;
  clkValue = 0;
  dtValue = 0;
  counter = 0;
  dir = 0;
  MIN = 0;
  MAX = 100;
  menuflag = 0;
  mylcd.init();
  mylcd.backlight();
  pinMode(2, INPUT);
  attachInterrupt(digitalPinToInterrupt(2),attachInterrupt_fun_FALLING_2,FALLING);
  pinMode(4, INPUT);
   dht13.begin();
  pinMode(3, INPUT_PULLUP);
}

void loop(){
  attachInterrupt(digitalPinToInterrupt(3),attachInterrupt_fun_FALLING_3,FALLING);

  if (menuflag == 0) {
    mainDisplay();
    contro = 0;

  }
  if (menuflag == 1) {
    lcdDisplay();

  }

}