//#include <Keyboard.h>

const int encoderClk = 2;  // Rotary encoder pin 1
const int encoderDT  = 3;  // Rotary encoder pin 2
const int buttonPin = 4;    // Rotary encoder button pin

int lastState;
int currentState;
int section = 0;

const int numSections = 7;
const char* sectionNames[] = {"Text Entry", "Types", "Instruments", "Styles", "Banks", "User", "Blank Section"};

#define KEY_TAB "KEY_TAB"
#define KEY_LEFT_SHIFT "KEY_LEFT_SHIFT"
#define KEY_RETURN "KEY_RETURN"


struct kbt {
  void begin();
  void write(String aKey);
  void release(String aKey);
} Keyboard;

void kbt::begin() {}
void kbt::write(String aKey) {
  Serial.print(aKey + " ");
}
void kbt::release(String aKey) {
  Serial.print(aKey + "_released ");
}

void setup() {
  Serial.begin(115200);
  Keyboard.begin();
  pinMode(encoderClk, INPUT_PULLUP);
  pinMode(encoderDT, INPUT_PULLUP);
  pinMode(buttonPin, INPUT_PULLUP);
  lastState = digitalRead(encoderClk);
}

void loop() {
  // Read the current state of the rotary encoder
  int state = digitalRead(encoderClk);
  if (state != lastState) {
    lastState = state;  // moved here from the wrong place ...
    if (!state && digitalRead(encoderDT) == HIGH) {
      section++;
      
      Serial.println("section++\t"+String(section));
      if (section >= numSections) { section = 0;  }
      if (section == 6) {
        // Send 5 tabs for Blank Section
        for (int i = 0; i < 5; i++) {
          Keyboard.write(KEY_TAB);
        }
      } else {
        Keyboard.write(KEY_TAB);
      }

      Serial.print("Section: ");
      Serial.println(sectionNames[section]);
      delay(100); // debounce delay

    } else {
      if (!state && digitalRead(encoderDT) == LOW){
        section--;
        Serial.println("section--\t"+String(section));
        if (section < 0) {
          section = numSections - 1;
        }
        if (section == 6) {
          // Send 5 shift+tabs for Blank Section
          Keyboard.write(KEY_LEFT_SHIFT);
          for (int i = 0; i < 5; i++) {
            Keyboard.write(KEY_TAB);
          }
          Keyboard.release(KEY_LEFT_SHIFT);
        } else {
          Keyboard.write(KEY_LEFT_SHIFT);
          Keyboard.write(KEY_TAB);
          Keyboard.release(KEY_LEFT_SHIFT);
          Keyboard.release(KEY_TAB);
        }
        Serial.print("Section: ");
        Serial.println(sectionNames[section]);
        delay(100); // debounce delay
      }  
    }
  }
  //lastState = state;  // Wrong place here!!!! Should be inside the "if (state != lastState))

  // Check if the encoder button has been pressed
  if (digitalRead(buttonPin) == LOW) {
    Keyboard.write(KEY_RETURN);
    Serial.println("Enter");
    delay(500); // debounce delay
    Keyboard.release(KEY_RETURN);
  }
}