#include <SimpleRotary.h>
#include <Wire.h> 
#include <LiquidCrystal_I2C.h>
LiquidCrystal_I2C lcd(0x27,16,2);

SimpleRotary rotary(6,5,7);

#define POT A0

bool lcd_on = false;
bool backLight_on = false;

bool valueIsSet = false;
bool stopCount = false;

const int backLightTimeOut = 15000;
const int LCDLightTimeOut = 30000;
unsigned long LastInputTime = 0;

int NOW_POT_VAL=0;
int OLD_POT_VAL=9999;

float MAPPED_W2V=0.0;
float MAPPED_W2mA=0.0;

int j=0;
int old_j=9999;
unsigned int multiplyer=1;
int max_val=12500;
int min_val=0;

void setup() {
  Serial.begin(115200);
  lcd.init();
  lcd.backlight();
  lcd.clear();
  lcd.setCursor(0,0);
  lcd.print("DEMO");
  lcd.setCursor(6,0);
  lcd.print("STEP: ");
  pinMode(POT, INPUT);
}

void loop() {
  NOW_POT_VAL=analogRead(POT);
  if (NOW_POT_VAL != OLD_POT_VAL){
    OLD_POT_VAL=NOW_POT_VAL;
    multiplyer=map(NOW_POT_VAL, 0, 1023, 1, 1000);
    reset_turnOn_LCDTimer();
    upDateLCD_POT();
    SerialPrint();
    
  }
  
  byte r;
  byte p;
  // 0 = not turning, 1 = CW, 2 = CCW
  r = rotary.rotate();
  p = rotary.push();

  if ( r == 1 ) {
    Serial.println("CW");
    j=j+multiplyer;

    if (j>max_val){
      j=max_val;
    }

  }

  if ( r == 2 ) {
    Serial.println("CCW");
    j=j-multiplyer;
    
    if (j<min_val){
      j=min_val;
    }
    
  }

  if(j != old_j){
    old_j=j;
    MAPPED_W2V = mapF(j, 0.0, 12500.0, 0.00, 10.00);
    MAPPED_W2mA = mapF(j, 0.0, 12500.0, 4.00, 20.00);
    reset_turnOn_LCDTimer();
    upDateLCD_W();
    SerialPrint();
    upDateLCD_lock(false);
  }
  if (p == 1){
    Serial.println("Value is set");
    reset_turnOn_LCDTimer();
    upDateLCD_lock(true);
  }

  if(!stopCount){
    turnOff_bLight_LCD();
  }

}

float mapF(float x, float in_min, float in_max, float out_min, float out_max)
{
  return (x - in_min) * (out_max - out_min) / (in_max - in_min) + out_min;
}

void upDateLCD_POT(){
  lcd.setCursor(12,0);
  lcd.print("    ");
  lcd.setCursor(12,0);
  lcd.print(multiplyer);
}
void upDateLCD_W(){
  lcd.setCursor(0,1);
  lcd.print("     ");
  lcd.setCursor(0,1);
  lcd.print(j);
}

void upDateLCD_lock(bool sw_ch){
  switch (sw_ch){
    case false:
      lcd.setCursor(13,1);
      lcd.print("   ");
      valueIsSet=false;
    break;
    case true:
      lcd.setCursor(13,1);
      lcd.print("SET");
      valueIsSet=true;
    break;
  }
  
}

void SerialPrint(){
  Serial.print(multiplyer);
  Serial.print("     ");
  Serial.print(j);
  Serial.print("     ");
  Serial.print(MAPPED_W2V,2);
  Serial.print("     ");
  Serial.println(MAPPED_W2mA,2);
}

void reset_turnOn_LCDTimer(){
  LastInputTime = millis();
  if(lcd_on==false){
    lcd.backlight();
    lcd.clear();
    lcd.setCursor(0,0);
    lcd.print("DEMO");
    lcd.setCursor(6,0);
    lcd.print("STEP: ");
    upDateLCD_POT();
    upDateLCD_W();
    upDateLCD_lock(valueIsSet);
  }
  if(lcd_on==true && backLight_on==false){
    lcd.backlight();
  }
  lcd_on = true;
  backLight_on = true;
  stopCount=false;
}

void turnOff_bLight_LCD(){
  unsigned long nowTime = millis()-LastInputTime;
  if((backLight_on==true)&&(nowTime>=backLightTimeOut)){
    lcd.noBacklight();
    backLight_on=false;
  }

  if((lcd_on==true)&&(nowTime>=LCDLightTimeOut)){
    lcd.clear();
    lcd_on=false;
    stopCount = true;
  }else if((lcd_on==true)&&(nowTime<LCDLightTimeOut)){
    if(nowTime%1000==0){
      Serial.print("Elapsed: ");
      Serial.println(nowTime/1000);
    }
    
  }
}