#include "AiEsp32RotaryEncoder.h"
#include "Arduino.h"
#include <LiquidCrystal_I2C.h>

#define ROTARY_ENCODER_A_PIN 34
#define ROTARY_ENCODER_B_PIN 35
#define ROTARY_ENCODER_BUTTON_PIN 19
#define ROTARY_ENCODER_VCC_PIN -1
#define ROTARY_ENCODER_STEPS 4

#define DAC_CH1 25
#define DAC_CH2 26

//instead of changing here, rather change numbers above
AiEsp32RotaryEncoder rotaryEncoder = AiEsp32RotaryEncoder(ROTARY_ENCODER_A_PIN, ROTARY_ENCODER_B_PIN, ROTARY_ENCODER_BUTTON_PIN, ROTARY_ENCODER_VCC_PIN, ROTARY_ENCODER_STEPS);
LiquidCrystal_I2C lcd(0x27,20,4);
int buttonState = 0;
int positionCurrent = 0;
int positionPrevious = 0;
int valueDAC1 = 0;
int valueDAC2 = 0;
bool selectCurDAC = 0;
bool selectPreDAC = 0;
bool valueReset = false;
char s = 126;
static unsigned long lastTimePressed =0;
bool buttonPress = false;

void rotary_onButtonClick()
{

}

void rotary_loop()
{
    //dont print anything unless value changed
}

void IRAM_ATTR readEncoderISR()
{
    rotaryEncoder.readEncoder_ISR();
        if (rotaryEncoder.encoderChanged()) {
            positionCurrent = rotaryEncoder.readEncoder();
    }
        
}

void updateDACValue() {
    if (valueReset == true) {
      lcd.setCursor(17,0);
      lcd.print("    ");
      lcd.setCursor(17,0);
      lcd.print(valueDAC1);
      lcd.setCursor(17,1);
      lcd.print("    ");
      lcd.setCursor(17,1);
      lcd.print(valueDAC2);
      dacWrite(DAC_CH1, valueDAC1);
      dacWrite(DAC_CH2, valueDAC2);  
      valueReset = false;    
    }
    else if (selectCurDAC == 0) {
      lcd.setCursor(17,0);
      lcd.print("    ");
      lcd.setCursor(17,0);
      valueDAC1 = valueDAC1 + positionCurrent - positionPrevious;
      lcd.print(valueDAC1);
      dacWrite(DAC_CH1, valueDAC1);
      }
    else if (selectCurDAC == 1) {
      lcd.setCursor(17,1);
      lcd.print("    ");
      lcd.setCursor(17,1);
      valueDAC2 = valueDAC2 + positionCurrent - positionPrevious;
      lcd.print(valueDAC2);
      dacWrite(DAC_CH2, valueDAC2);
    }
}
void updateDACSelect() {  
    if (selectCurDAC == 0) {
      lcd.home();
      lcd.print(s);
      lcd.print(" DAC CH1 Value: ");
      lcd.print(valueDAC1);
      lcd.setCursor(0,1);
      lcd.print("  DAC CH2 Value: ");
      lcd.print(valueDAC2);
    }
    else if (selectCurDAC == 1) {
      lcd.home();
      lcd.print("  DAC CH1 Value: ");
      lcd.print(valueDAC1);
      lcd.setCursor(0,1);
      lcd.print(s);
      lcd.print(" DAC CH2 Value: ");
      lcd.print(valueDAC2);      
    }
  }
void setup()
{
    //we must initialize rotary encoder
    rotaryEncoder.begin();
    rotaryEncoder.setup(readEncoderISR);
    //set boundaries and if values should cycle or not
    //in this example we will set possible values between 0 and 1000;
    //bool circleValues = false;
    //rotaryEncoder.setBoundaries(0, 255, circleValues); //minValue, maxValue, circleValues true|false (when max go to min and vice versa)

    /*Rotary acceleration introduced 25.2.2021.
   * in case range to select is huge, for example - select a value between 0 and 1000 and we want 785
   * without accelerateion you need long time to get to that number
   * Using acceleration, faster you turn, faster will the value raise.
   * For fine tuning slow down.
   */
    //rotaryEncoder.disableAcceleration(); //acceleration is now enabled by default - disable if you dont need it
    //rotaryEncoder.setAcceleration(250); //or set the value - larger number = more accelearation; 0 or 1 means disabled acceleration
    lcd.init();
    lcd.clear();         
    lcd.backlight(); 
    updateDACSelect();
}

void loop() {
    //in loop call your custom function which will process rotary encoder values
    if (selectPreDAC != selectCurDAC) { 
      updateDACSelect();
      selectPreDAC = selectCurDAC;
    }
    if (positionPrevious != positionCurrent || valueReset == true) {
      updateDACValue();
      positionPrevious = positionCurrent;
    }
    if (rotaryEncoder.isEncoderButtonClicked()) {
      if (millis() - lastTimePressed < 5000) {
        selectCurDAC = !selectCurDAC;
        buttonState = 1;
      }
      else if (millis() - lastTimePressed > 5000) {
         valueDAC1 = 0;
         valueDAC2 = 0;
         valueReset = true;
      }
    }

    if (digitalRead(19) == HIGH){
      lastTimePressed = millis();
    }
      lcd.setCursor(0,2);
      lcd.print(millis());
      lcd.setCursor(0,3);
      lcd.print(lastTimePressed);
    delay(10); //or do whatever you need to do...
}