#include<LiquidCrystal_I2C.h>
#define MENUSET 7
#define INCRSET 11
#define DECRSET 13
#define EXIT 5
LiquidCrystal_I2C lcd(0x27, 16, 2);

bool ShowMenu = 0;

bool menupressed = 0;
bool menuactive = 0;
bool exitpressed = 0;
int submenuselection = 0;
bool submenuentered = 0;

bool incrpressed = 0;
bool tempmenu = 0;
bool humidmenu = 0;
bool daymenu = 0;
bool decrpressed = 0;

float hum = 0;
float temp = 0;

const int MINTEMP = 20;
const int MAXTEMP = 40;
const int MINHUM = 20;
const int MAXHUM = 85;
const int MINDAY = 1;
const int MAXDAY = 45;

float SETTEMP = 37.50;
float SETHUM = 55.00;
int SETDAY = 21;

float prevhum = 0;
float prevtemp = 0;

int day = 0;
unsigned long dayprevMillis = 0;
unsigned long daycurrentMillis = 0;
int hour = 0;
unsigned long hourprevMillis = 0;
unsigned long hourcurrentMillis = 0;

// Debounce delay in milliseconds
const unsigned long DEBOUNCE_DELAY = 300;

// Button states for debounce logic
bool menuState = LOW;
bool incrState = LOW;
bool decrState = LOW;
bool exitState = LOW;

char value[16];  // for lcd display

void setup() {
  // put your setup code here, to run once:
  Serial.begin(9600);
  pinMode(MENUSET, INPUT);
  pinMode(INCRSET, INPUT);
  pinMode(DECRSET, INPUT);
  pinMode(EXIT, INPUT);
  digitalWrite(MENUSET, LOW);
  digitalWrite(INCRSET, LOW);
  digitalWrite(DECRSET, LOW);
  digitalWrite(EXIT, LOW);
  lcd.init();       // initialize the lcd
  lcd.backlight();  // open the backlight
  lcd.clear();


}

void loop() {
  // put your main code here, to run repeatedly:
  pollpins();
}
void pollpins() {
  // Read menu button with debounce
  static unsigned long lastMenuTime = 0;
  bool currentMenuState = digitalRead(MENUSET);

  if (currentMenuState != menuState && millis() - lastMenuTime > DEBOUNCE_DELAY) {
    menuState = currentMenuState;

    if (menuState == HIGH) {
      if (menuactive == true) {
        submenuentered = true;
        ShowSubMenu(submenuselection);
        Serial.println("Sub menu entered");
      } else {
        menuactive = true;
        MainMenu();
        ShowSelectedItem();
      }
      
    }

    lastMenuTime = millis();
  }

  // Read increment button with debounce
  static unsigned long lastIncrTime = 0;
  bool currentIncrState = digitalRead(INCRSET);

  if (currentIncrState != incrState && millis() - lastIncrTime > DEBOUNCE_DELAY) {
    incrState = currentIncrState;

    if (incrState == HIGH) {
      if (menuactive == 1 && submenuentered == 0) {
        submenuselection++;
        if (submenuselection > 2) {
          submenuselection = 0;
        }
        ShowSelectedItem();
      } else if (menuactive == 1 && submenuentered == 1) {
        inc_dec(0,submenuselection);
      }
    }

    lastIncrTime = millis();
  }

  // Read decrement button with debounce
  static unsigned long lastDecrTime = 0;
  bool currentDecrState = digitalRead(DECRSET);

  if (currentDecrState != decrState && millis() - lastDecrTime > DEBOUNCE_DELAY) {
    decrState = currentDecrState;

    if (decrState == HIGH) {
      if (menuactive == 1 && submenuentered == 0) {
        submenuselection--;
        if (submenuselection < 0) {
          submenuselection = 2;
        }
        ShowSelectedItem();
      } else if (menuactive == 1 && submenuentered == 1) {
         inc_dec(1,submenuselection);
      }
    }

    lastDecrTime = millis();
  }

  // Read exit button with debounce
  static unsigned long lastExitTime = 0;
  bool currentExitState = digitalRead(EXIT);

  if (currentExitState != exitState && millis() - lastExitTime > DEBOUNCE_DELAY) {
    exitState = currentExitState;

    if (exitState == HIGH) {
      submenuentered = false;
      menuactive = false;
      submenuselection = 0;
      Serial.print("Called ShowValues()");
    }

    lastExitTime = millis();
    //ShowValues();
    lcd.clear();
    lcd.print("Called Show values");
  }
}
void MainMenu() {
  // Lcd shows Menu
  //Serial.begin(9600);
  Serial.println("Showing Main Menu");
  lcd.clear();
  lcd.setCursor(0, 0);
  lcd.print("Select Setting :");
  lcd.setCursor(0, 1);
  lcd.println(" Temp| Hum| Day");
  //lcd.println("hgfgfhjgjjkhkjg");
}
void ShowSubMenu(int submenuselection) {
  Serial.println("Showing submenu");
    if (submenuselection == 0) {
      Serial.println("Temperature menu");
      lcdprint("Temperature", "Temp", dtostrf(SETTEMP, 2, 1, value));
    } else if (submenuselection == 1) {
      Serial.println("Humidity menu");
      lcdprint("Humidity", "Hum", dtostrf(SETHUM, 2, 1, value));
    } else if (submenuselection == 2) {
      Serial.println("Day menu");
      lcdprint("Days", "Day", dtostrf(SETDAY, 2, 0, value));
    }
}
void inc_dec(int op, int submenuselection) {
  //Serial.println("Showing submenu Details");
  if (op == 0) {
    if (submenuselection == 0) {
      Serial.println("Temperature Increment");
      SETTEMP = SETTEMP + 0.5;
      if(SETTEMP > MAXTEMP){SETTEMP = MAXTEMP;}
      lcdprint("Temperature", "Temp", dtostrf(SETTEMP, 2, 2, value));
    } else if (submenuselection == 1) {
      Serial.println("Humidity Increment");
      SETHUM = SETHUM + 0.5;
      if(SETHUM > MAXHUM){SETHUM = MAXHUM;}
      lcdprint("Humidity", "Hum", dtostrf(SETHUM, 2, 2, value));
    } else if (submenuselection == 2) {
      Serial.println("Day Increment");
      SETDAY = SETDAY + 1;
      if(SETDAY > MAXDAY){SETDAY = MAXDAY;}
      lcdprint("Days", "Day", dtostrf(SETDAY, 2, 0, value));
    }
  } else if (op == 1) {
    if (submenuselection == 0) {
      Serial.println("Temperature Decrement");
      SETTEMP = SETTEMP - 0.5;
      if(SETTEMP < MINTEMP){SETTEMP = MINTEMP;}
      lcdprint("Temperature", "Temp", dtostrf(SETTEMP, 2, 2, value));
    } else if (submenuselection == 1) {
      Serial.println("Humidity Decrement");
      SETHUM = SETHUM - 0.5;
      if(SETHUM < MINHUM){SETHUM = MINHUM;}
      lcdprint("Humidity", "Hum", dtostrf(SETHUM, 2, 2, value));
    } else if (submenuselection == 2) {
      Serial.println("Day Decrement");
      SETDAY = SETDAY - 1;
      if(SETDAY < MINDAY){SETDAY = MINDAY;}
      lcdprint("Days", "Day", dtostrf(SETDAY, 2, 0, value));
    }
  }
}
void ShowSelectedItem() {
  Serial.print("Showing Submenu Selection ");
  Serial.println(submenuselection);
  if (submenuselection == 0) {
    lcd.setCursor(0, 1);
    lcd.print('>');
    lcd.setCursor(6, 1);
    lcd.print(' ');
    lcd.setCursor(11, 1);
    lcd.print(' ');
  } else if (submenuselection == 1) {
    lcd.setCursor(0, 1);
    lcd.print(' ');
    lcd.setCursor(6, 1);
    lcd.print('>');
    lcd.setCursor(11, 1);
    lcd.print(' ');
  } else if (submenuselection == 2) {
    lcd.setCursor(0, 1);
    lcd.print(' ');
    lcd.setCursor(6, 1);
    lcd.print(' ');
    lcd.setCursor(11, 1);
    lcd.print('>');
  }
}
void lcdprint(char *menuname, char *mnushort, char *value) {
  lcd.clear();
  lcd.setCursor(0, 0);
  lcd.print("Set ");
  lcd.print(menuname);
  lcd.print(":");
  lcd.setCursor(0, 1);
  lcd.print(mnushort);
  lcd.print(" -> ");
  lcd.print(value);
}

int daycounter() {
  daycurrentMillis = millis();
  //day = millis();
  if (daycurrentMillis - dayprevMillis >= 86400000) {
    day++;
    dayprevMillis = daycurrentMillis;
    // Serial.println(day);
  }
  return day;
}
int hourcounter() {
  hourcurrentMillis = millis();
  //day = millis();
  if (hourcurrentMillis - hourprevMillis >= 3600000) {
    hour++;
    hourprevMillis = hourcurrentMillis;
    if (hour == 24) { hour = 0; }
  }
  Serial.println(hour);
  return hour;
}