/*
  LCD I²C HELLO WORLD

  MADE BY BRAYLEN HAMMOND

  YOU MAY USE THE CODE AND DIAGRAM TO HELP YOU WITH YOUR LCD.
  THIS CODE DOESNT APPLY TO THE NORMAL LCD, IT ONLY
  APPLIES TO THE I2C LCD. YOU CAN DO THIS ON WOKWI OR
  ON YOUR ACTUAL ARDUINO. THIS PROJECT IS ONLY
  TESTED THE ARDUINO UNO, YOU CAN TRY ON OTHER
  ARDUINOES TO SEE IF IT WORKS.

  GO TO MY YOUTUBE CHANNEL FOR MORE HELP WITH CODING AN ARDUINO. Please Subscribe, it's free and it'll help out a ton.
  https://www.youtube.com/channel/UCccMHKRai1dwgxwFg-w8hZA


  Have fun, be creative and enjoy the help I do for you
*/

// Add the Liquid Crystal I2C library
#include <LiquidCrystal_I2C.h>

// Add the lcd
LiquidCrystal_I2C lcd(0x27, 16, 2);

#define   buttonUP    2
#define   buttonDOWN  3
#define   buttonSAVE  4
#define   buttonENTER 5

unsigned long backlight_tm = 0;


struct Default_variable {
  uint8_t device_IP[4]   = {192, 168, 0, 186};   // RTU device static IPv4
  uint8_t gateway[4]     = {192, 168, 0, 1};     // RTU device gateway
  uint8_t subnet[4]      = {255, 255, 255, 0};   // RTU device subnet mask
  uint8_t dns_server[4]  = {192, 168, 0, 1};     // RTU device DNS server
  uint16_t net_timeout   = 500;                  // 500 ms network timeout for event update
  uint16_t debounce_tm   = 200;                  // Routine time for timer is debouncing time in milliseconds
} default_var, running_var;


enum CONFIGURATION {
  ENABLE,
  DISABLE
};
bool setup_mode = DISABLE;


enum MODE {
  IP_MODE = 0,
  GATEWAY_MODE = 1,
  SUBNET_MODE = 2,
  DNS_MODE = 3,
};
uint8_t mode_pos = IP_MODE;

enum IP_OCTET {
  FIRST_OCTET = 0,
  SECOND_OCTET = 4,
  THIRD_OCTET = 8,
  FOURTH_OCTET = 12
};
uint8_t cursor_pos = FIRST_OCTET;

uint8_t *first_octet  = &running_var.device_IP[0];
uint8_t *second_octet = &running_var.device_IP[1];
uint8_t *third_octet  = &running_var.device_IP[2];
uint8_t *fourth_octet = &running_var.device_IP[3];

bool show_display = false;

void setup() {
  // Initalise the LCD
  lcd.init();
  // Turn on the LCD backlight
  lcd.backlight();
  // Put text on the LCD
  lcd.print("Hello World!");

  lcd.backlight();

  pinMode(buttonUP, INPUT_PULLUP);
  pinMode(buttonDOWN, INPUT_PULLUP);
  pinMode(buttonENTER, INPUT_PULLUP);
  pinMode(buttonSAVE, INPUT_PULLUP);

  // Clear the LCD screen
  lcd.clear();
  //cursor blinking
  lcd.noBlink();

  lcd.setCursor(0, 1);  // Set the cursor to the first column, Second row
  lcd.print(*first_octet);
  lcd.print(".");
  lcd.print(*second_octet);
  lcd.print(".");
  lcd.print(*third_octet);
  lcd.print(".");
  lcd.print(*fourth_octet);

  Serial.begin(115200);

}


void loop() {

  if (setup_mode == ENABLE) {

    lcd.setCursor(cursor_pos, 1);  // Set the cursor to the first column, Second row

    if (cursor_pos == FIRST_OCTET) {
      if (*first_octet < 10) {
        lcd.print("  ");
        lcd.print(*first_octet);    // Print the updated number
      } else if (*first_octet < 100) {
        lcd.print(" ");
        lcd.print(*first_octet);    // Print the updated number
      } else {
        lcd.print(*first_octet);    // Print the updated number
      }
      lcd.print(".");    // separator
    }

    if (cursor_pos == SECOND_OCTET) {
      if (*second_octet < 10) {
        lcd.print("  ");
        lcd.print(*second_octet);    // Print the updated number
      } else if (*second_octet < 100) {
        lcd.print(" ");
        lcd.print(*second_octet);    // Print the updated number
      } else {
        lcd.print(*second_octet);    // Print the updated number
      }
      lcd.print(".");    // separator
    }

    if (cursor_pos == THIRD_OCTET) {
      if (*third_octet < 10) {
        lcd.print("  ");
        lcd.print(*third_octet);    // Print the updated number
      } else if (*third_octet < 100) {
        lcd.print(" ");
        lcd.print(*third_octet);    // Print the updated number
      } else {
        lcd.print(*third_octet);    // Print the updated number
      }
      lcd.print(".");    // separator
    }

    if (cursor_pos == FOURTH_OCTET) {
      if (*fourth_octet < 10) {
        lcd.print("  ");
        lcd.print(*fourth_octet);    // Print the updated number
      } else if (*fourth_octet < 100) {
        lcd.print(" ");
        lcd.print(*fourth_octet);    // Print the updated number
      } else {
        lcd.print(*fourth_octet);    // Print the updated number
      }
    }

  }


  if (digitalRead(buttonUP) == LOW) {
    backlight_tm = millis();
    lcd.backlight();

    if (setup_mode == ENABLE) {

      switch (cursor_pos) {
        case FIRST_OCTET:
          (*first_octet)++;
          break;
        case SECOND_OCTET:
          (*second_octet)++;
          break;
        case THIRD_OCTET:
          (*third_octet)++;
          break;
        case FOURTH_OCTET:
          (*fourth_octet)++;
          break;
        default:
          //do nothing
          break;
      }

    } else {
      show_display = true;  //turn on display
      //change mode selection
      switch (mode_pos) {
        case DNS_MODE  :
          mode_pos = SUBNET_MODE ;
          first_octet  = &running_var.subnet[0];
          second_octet = &running_var.subnet[1];
          third_octet  = &running_var.subnet[2];
          fourth_octet = &running_var.subnet[3];
          break;
        case SUBNET_MODE  :
          mode_pos = GATEWAY_MODE ;
          first_octet  = &running_var.gateway[0];
          second_octet = &running_var.gateway[1];
          third_octet  = &running_var.gateway[2];
          fourth_octet = &running_var.gateway[3];
          break;
        case GATEWAY_MODE :
          mode_pos = IP_MODE ;
          first_octet  = &running_var.device_IP[0];
          second_octet = &running_var.device_IP[1];
          third_octet  = &running_var.device_IP[2];
          fourth_octet = &running_var.device_IP[3];
          break;
        case IP_MODE  :
          mode_pos = DNS_MODE;
          first_octet  = &running_var.dns_server[0];
          second_octet = &running_var.dns_server[1];
          third_octet  = &running_var.dns_server[2];
          fourth_octet = &running_var.dns_server[3];
          break;
        default:
          //do nothing
          break;
      }


    }

  }

  if (digitalRead(buttonDOWN) == LOW) {
    backlight_tm = millis();
    lcd.backlight();


    if (setup_mode == ENABLE) {
      switch (cursor_pos) {
        case FIRST_OCTET:
          (*first_octet)--;
          break;
        case SECOND_OCTET:
          (*second_octet)--;
          break;
        case THIRD_OCTET:
          (*third_octet)--;
          break;
        case FOURTH_OCTET:
          (*fourth_octet)--;
          break;
        default:
          //do nothing
          break;
      }

    } else {
      show_display = true;  //turn on display
      //change mode selection
      switch (mode_pos) {
        case IP_MODE :
          mode_pos = GATEWAY_MODE;
          first_octet  = &running_var.gateway[0];
          second_octet = &running_var.gateway[1];
          third_octet  = &running_var.gateway[2];
          fourth_octet = &running_var.gateway[3];
          break;
        case GATEWAY_MODE :
          mode_pos = SUBNET_MODE;
          first_octet  = &running_var.subnet[0];
          second_octet = &running_var.subnet[1];
          third_octet  = &running_var.subnet[2];
          fourth_octet = &running_var.subnet[3];
          break;
        case SUBNET_MODE:
          mode_pos = DNS_MODE;
          first_octet  = &running_var.dns_server[0];
          second_octet = &running_var.dns_server[1];
          third_octet  = &running_var.dns_server[2];
          fourth_octet = &running_var.dns_server[3];
          break;
        case DNS_MODE :
          mode_pos = IP_MODE;
          first_octet  = &running_var.device_IP[0];
          second_octet = &running_var.device_IP[1];
          third_octet  = &running_var.device_IP[2];
          fourth_octet = &running_var.device_IP[3];
          break;
        default:
          //do nothing
          break;
      }
    }
  }


  if (digitalRead(buttonENTER) == LOW) {
    backlight_tm = millis();
    lcd.backlight();
    lcd.blink();
    setup_mode = ENABLE;

    switch (cursor_pos) {
      case FIRST_OCTET:
        cursor_pos = SECOND_OCTET;
        break;
      case SECOND_OCTET:
        cursor_pos = THIRD_OCTET;
        break;
      case THIRD_OCTET:
        cursor_pos = FOURTH_OCTET;
        break;
      case FOURTH_OCTET:
        cursor_pos = FIRST_OCTET;
        break;
      default:
        //do nothing
        break;
    }
    delay(500);
  }

  if (digitalRead(buttonSAVE) == LOW) {
    backlight_tm = millis();
    lcd.backlight();
    lcd.noBlink();
    setup_mode = DISABLE;

    // Clear the LCD screen
    lcd.clear();


    switch (mode_pos) {
      case IP_MODE :
        lcd.setCursor(0, 0);  // Set the cursor to the first column, Second row
        lcd.print("STATIC_IP:");

        lcd.setCursor(0, 1);  // Set the cursor to the first column, Second row
        lcd.print(*first_octet);
        lcd.print(".");
        lcd.print(*second_octet);
        lcd.print(".");
        lcd.print(*third_octet);
        lcd.print(".");
        lcd.print(*fourth_octet);
        break;
      case GATEWAY_MODE :
        lcd.setCursor(0, 0);  // Set the cursor to the first column, Second row
        lcd.print("GATEWAY:");

        lcd.setCursor(0, 1);  // Set the cursor to the first column, Second row
        lcd.print(*first_octet);
        lcd.print(".");
        lcd.print(*second_octet);
        lcd.print(".");
        lcd.print(*third_octet);
        lcd.print(".");
        lcd.print(*fourth_octet);
        break;
      case SUBNET_MODE:
        lcd.setCursor(0, 0);  // Set the cursor to the first column, Second row
        lcd.print("SUBNET:");

        lcd.setCursor(0, 1);  // Set the cursor to the first column, Second row
        lcd.print(*first_octet);
        lcd.print(".");
        lcd.print(*second_octet);
        lcd.print(".");
        lcd.print(*third_octet);
        lcd.print(".");
        lcd.print(*fourth_octet);
        break;
      case DNS_MODE :
        lcd.setCursor(0, 0);  // Set the cursor to the first column, Second row
        lcd.print("DNS:");

        lcd.setCursor(0, 1);  // Set the cursor to the first column, Second row
        lcd.print(*first_octet);
        lcd.print(".");
        lcd.print(*second_octet);
        lcd.print(".");
        lcd.print(*third_octet);
        lcd.print(".");
        lcd.print(*fourth_octet);
        break;
      default:
        //do nothing
        break;
    }
  }


  if (show_display) {
    backlight_tm = millis();
    lcd.backlight();

    show_display = false;  //display off

    // Clear the LCD screen
    lcd.clear();

    switch (mode_pos) {
      case IP_MODE :
        lcd.setCursor(0, 0);  // Set the cursor to the first column, Second row
        lcd.print("STATIC_IP:");

        lcd.setCursor(0, 1);  // Set the cursor to the first column, Second row
        lcd.print(*first_octet);
        lcd.print(".");
        lcd.print(*second_octet);
        lcd.print(".");
        lcd.print(*third_octet);
        lcd.print(".");
        lcd.print(*fourth_octet);
        break;
      case GATEWAY_MODE :
        lcd.setCursor(0, 0);  // Set the cursor to the first column, Second row
        lcd.print("GATEWAY:");

        lcd.setCursor(0, 1);  // Set the cursor to the first column, Second row
        lcd.print(*first_octet);
        lcd.print(".");
        lcd.print(*second_octet);
        lcd.print(".");
        lcd.print(*third_octet);
        lcd.print(".");
        lcd.print(*fourth_octet);
        break;
      case SUBNET_MODE:
        lcd.setCursor(0, 0);  // Set the cursor to the first column, Second row
        lcd.print("SUBNET:");

        lcd.setCursor(0, 1);  // Set the cursor to the first column, Second row
        lcd.print(*first_octet);
        lcd.print(".");
        lcd.print(*second_octet);
        lcd.print(".");
        lcd.print(*third_octet);
        lcd.print(".");
        lcd.print(*fourth_octet);
        break;
      case DNS_MODE :
        lcd.setCursor(0, 0);  // Set the cursor to the first column, Second row
        lcd.print("DNS:");

        lcd.setCursor(0, 1);  // Set the cursor to the first column, Second row
        lcd.print(*first_octet);
        lcd.print(".");
        lcd.print(*second_octet);
        lcd.print(".");
        lcd.print(*third_octet);
        lcd.print(".");
        lcd.print(*fourth_octet);
        break;
      default:
        //do nothing
        break;
    }
  }

  if (millis() - backlight_tm > 1000) {
    lcd.noBacklight();
  }
  Serial.println(mode_pos);
  Serial.print(*first_octet);
        Serial.print(".");
        Serial.print(*second_octet);
        Serial.print(".");
        Serial.print(*third_octet);
        Serial.print(".");
        Serial.println(*fourth_octet);
}