#include <Adafruit_GFX.h>
#include <Adafruit_ST7735.h>
#include <ezButton.h>  // the library to use for SW pin on encoder

#define CLK_PIN 34  // ESP32 pin GPIO25 connected to the rotary encoder's CLK pin
#define DT_PIN 35   // ESP32 pin GPIO26 connected to the rotary encoder's DT pin
#define SW_PIN 32   // ESP32 pin GPIO27 connected to the rotary encoder's SW pin

#define CLK_PIN2 33  // ESP32 2nd connected  rotary encoder's CLK pin
#define DT_PIN2 25   // ESP32 2nd connected  rotary encoder's DT pin
#define SW_PIN2 13   // ESP32 2nd connected  rotary encoder's SW pin

#define DIRECTION_CW 0   // clockwise direction rotary
#define DIRECTION_CCW 1  // counter-clockwise direction rotary

#define TFT_CS 5
#define TFT_RST 4
#define TFT_DC 2
#define TFT_BL 22  // LED back-light

//int counter = 0;                //rotary
int vfoa = 0740.00000;
int direction = DIRECTION_CW;  //rotary
int CLK_state;                 //rotary
int prev_CLK_state;            //rotary
ezButton button(SW_PIN);       // create ezButton object that attach to pin 32;

int vfob = 2400.00000;
int direction2 = DIRECTION_CW;  //rotary2
int CLK_state2;                 //rotary2
int prev_CLK_state2;            //rotary2
ezButton button2(SW_PIN2);      // create ezButton object that attach to pin ;

bool updateDisplay = false;

Adafruit_ST7735 tft = Adafruit_ST7735(TFT_CS, TFT_DC, TFT_RST);  // hardware SPI


void setup(void) {

  tft.initR(INITR_BLACKTAB);  // Init ST7735S chip, black tab

  // configure encoder pins as inputs
  pinMode(CLK_PIN, INPUT);
  pinMode(DT_PIN, INPUT);
  button.setDebounceTime(50);  // set debounce time to 50 milliseconds

  // read the initial state of the rotary encoder's CLK pin
  prev_CLK_state = digitalRead(CLK_PIN);

  // configure encoder pins as inputs
  pinMode(CLK_PIN2, INPUT);
  pinMode(DT_PIN2, INPUT);
  button2.setDebounceTime(50);  // set debounce time to 50 milliseconds

  // read the initial state of the rotary encoder's CLK pin
  prev_CLK_state2 = digitalRead(CLK_PIN2);

  pinMode(TFT_BL, OUTPUT);
  digitalWrite(TFT_BL, HIGH);
  tft.setRotation(1);
  tft.fillScreen(ST77XX_BLACK);

  tft.setTextColor(ST77XX_GREEN);
  tft.setTextSize(2);
  tft.setCursor(0, 20);
  tft.println(vfoa);
  tft.println("mhz");
  tft.setTextColor(ST77XX_YELLOW);
  tft.setCursor(0, 60);
  tft.println(vfob);
  tft.println("mhz");
}

void loop() {
  button.loop();   // MUST call the loop() function first
  button2.loop();  // MUST call the loop() function first

  // read the current state of the rotary encoder's CLK pin
  CLK_state = digitalRead(CLK_PIN);

  // If the state of CLK is changed, then pulse occurred
  // React to only the rising edge (from LOW to HIGH) to avoid double count
  if (CLK_state != prev_CLK_state && CLK_state == HIGH) {
    // if the DT state is HIGH
    // the encoder is rotating in counter-clockwise direction => decrease the counter
    if (digitalRead(DT_PIN) == HIGH) {
      vfoa--;
      direction = DIRECTION_CCW;
    } else {
      // the encoder is rotating in clockwise direction => increase the counter
      vfoa++;
      direction = DIRECTION_CW;
    }
    updateDisplay = true;
  }
  // save last CLK state
  prev_CLK_state = CLK_state;

  // read the current state of the rotary encoder's CLK pin
  CLK_state2 = digitalRead(CLK_PIN2);

  // If the state of CLK is changed, then pulse occurred
  // React to only the rising edge (from LOW to HIGH) to avoid double count
  if (CLK_state2 != prev_CLK_state2 && CLK_state2 == HIGH) {
    // if the DT state is HIGH
    // the encoder is rotating in counter-clockwise direction => decrease the counter
    if (digitalRead(DT_PIN2) == HIGH) {
      vfob--;
      direction2 = DIRECTION_CCW;
    } else {
      // the encoder is rotating in clockwise direction => increase the counter
      vfob++;
      direction2 = DIRECTION_CW;
    }
    updateDisplay = true;
  }
  // save last CLK state
  prev_CLK_state2 = CLK_state2;

  if (updateDisplay) {
    updateDisplay = false;

    //to convert count to vfo and display
    tft.fillScreen(ST77XX_BLACK);

    tft.setTextColor(ST77XX_YELLOW);
    tft.setCursor(0, 60);
    tft.println(vfob);
    tft.println("mhz");
    tft.fillScreen(ST77XX_BLACK);
    tft.setTextColor(ST77XX_GREEN);
    tft.setTextSize(2);
    tft.setCursor(0, 20);
    tft.println(vfoa);
    tft.println("mhz");
    tft.setTextColor(ST77XX_YELLOW);
    tft.setCursor(0, 60);
    tft.println(vfob);
    tft.println("mhz");
  }

  if (button.isPressed()) {
    Serial.println("button1 is pressed");
  }

  if (button2.isPressed()) {
    Serial.println("button2 is pressed");
  }
}