#include <LiquidCrystal_I2C.h>

#define I2C_ADDR    0x27
#define LCD_COLUMNS 16
#define LCD_LINES   2

LiquidCrystal_I2C lcd(I2C_ADDR, LCD_COLUMNS, LCD_LINES);

const int btn_arrow_left = A0;
const int btn_arrow_right = A1;
const int btn_setting = A2;
const int btn_flash = A3;
int displaystate = 0;
int mode = 0, mode1 = 0, mode2 = 0, mode3 = 0;
int settingpoint = 1;

int amber1 = 13, amber2 = 9, amber3 = 6, amber4 = 3;

void setup() {
  // put your setup code here, to run once:
  Serial.begin(9600);
  lcd.init();
  lcd.backlight();
  lcd.setCursor(2, 0);
  lcd.print("CURVIO TL400");
  pinMode(btn_flash, INPUT_PULLUP);
  pinMode(btn_setting, INPUT_PULLUP);
  pinMode(btn_arrow_left, INPUT_PULLUP);
  pinMode(btn_arrow_right, INPUT_PULLUP);
}

void loop() {
  // put your main code here, to run repeatedly:
  mode = digitalRead(btn_flash);
  mode1 = digitalRead(btn_setting);
  mode2 = digitalRead(btn_arrow_left);
  mode3 = digitalRead(btn_arrow_right);

  if (mode == HIGH){
      Serial.println("FLASHING MODE: ON");
      if (displaystate == 0){
        lcd.setCursor(0, 1);
        lcd.print("<MODE: FLASHING>");
      }
      digitalWrite(amber1, HIGH);
      digitalWrite(amber2, HIGH);  
      digitalWrite(amber3, HIGH);  
      digitalWrite(amber4, HIGH);   
      delay(750);
      digitalWrite(amber1, LOW);  
      digitalWrite(amber2, LOW);  
      digitalWrite(amber3, LOW);  
      digitalWrite(amber4, LOW);   
      delay(750);
  } else {
      if (displaystate == 0){
        lcd.setCursor(0, 1);
        lcd.print("<MODE: RUNNING >");
      }
      delay(1000);
  }

  if (mode2 == LOW){settingpoint--;} if (mode3 == LOW){settingpoint++;}
  if (settingpoint <= 0){settingpoint = 1;} if (settingpoint >= 6){settingpoint = 5;}

  if (mode1 == LOW){
    displaystate = 1;
  } 

  if (displaystate == 1){settings();}

}

void settings(){
  lcd.setCursor(0, 0);
  lcd.print("   <SETTINGS>   ");
  lcd.setCursor(0, 1);
  if (settingpoint == 1){lcd.print("   - Line01 -   ");} else
  if (settingpoint == 2){lcd.print("   - Line02 -   ");} else
  if (settingpoint == 3){lcd.print("   - Line03 -   ");} else
  if (settingpoint == 4){lcd.print("   - Line04 -   ");} else
  if (settingpoint == 5){lcd.print("    - Exit -    ");} 
}

void offallleds(){
  digitalWrite(amber1, LOW);
  digitalWrite(amber2, LOW);
  digitalWrite(amber3, LOW);
  digitalWrite(amber4, LOW);
}

void clearlcd(int LineS){
  lcd.setCursor(0, LineS);
  lcd.print("                ");
}