const int buttonPin1 = 18;  // button connected to digital pin 18
const int buttonPin2 = 19;  // button connected to digital pin 19
const int ledPins[] = {3,4,5,6,7,8,9}; // LEDs connected to digital pins 6 to 12

int pattern = 0;      // variable to store LED pattern
int frequency = 100;  // variable to store LED blinking frequency (in milliseconds)

int pot;
int num;

long holdingTime;
long previousHoldingTime;
unsigned long firstButtonPressTime;
byte buttonState;
byte previousButtonState = HIGH;
bool AdcFlag = false;


void checkButton1(){
    buttonState = digitalRead(buttonPin1);

    if (buttonState == LOW && previousButtonState == HIGH) 
    {
      firstButtonPressTime = millis();
    }
    holdingTime = (millis() - firstButtonPressTime);

    if (holdingTime > 50) 
    {
    
      if (buttonState == HIGH && previousButtonState == LOW) 
      {
        
          pattern = (pattern + 1) % 5;  // change pattern
          frequency = 100; //reset frequency on pattern change
      }
    }
  
  previousButtonState = buttonState;

  }




void checkButton2(){

  buttonState = digitalRead(buttonPin2);

  if (buttonState == LOW && previousButtonState == HIGH && (millis() - firstButtonPressTime) > 200) 
  {
    firstButtonPressTime = millis();
  }
  holdingTime = (millis() - firstButtonPressTime);

  if (holdingTime > 100) 
  {
   
    if (buttonState == HIGH && previousButtonState == LOW) 
    {
      if (holdingTime <= 1000)
      {
        Serial.println("short button press");      
        Serial.println(frequency += 200); 
      }
      if (holdingTime > 1000) 
      {
        if(AdcFlag == true){
          Serial.println("long button press");
          AdcFlag = false; //long press to get out of ADC mode back to the patterns
        }else{
          Serial.println("long button press");
          AdcFlag = true;  //long press makes flag true so that void loop can enter adc isr   
        }
         
        
      }
    }
  }
   previousButtonState = buttonState;
   previousHoldingTime = holdingTime;

}

void setup() {
  for (int i = 0; i < 7; i++) {
    pinMode(ledPins[i], OUTPUT);
  }
  pinMode(buttonPin1, INPUT_PULLUP);
  pinMode(buttonPin2, INPUT_PULLUP);


  Serial.begin(9600);
  
  attachInterrupt(digitalPinToInterrupt(buttonPin1), checkButton1, FALLING);

  attachInterrupt(digitalPinToInterrupt(buttonPin2), checkButton2, FALLING);
}

void loop() {

if (AdcFlag == true){
  longPress();
}else if (AdcFlag == false){
  switch (pattern) {
    case 0:  // pattern 1
        Serial.println("Patt 1");

        for (int i = 0; i < 7; i++) {
          
          digitalWrite(ledPins[i], HIGH);
          delay(frequency);
          digitalWrite(ledPins[i], LOW);
          delay(frequency);
        }
      
      break;

    case 1:  // pattern 2
        Serial.println("Patt 2");          

        for (int i = 6; i >= 0; i--) {
          digitalWrite(ledPins[i], HIGH);
          delay(frequency);
          digitalWrite(ledPins[i], LOW);
          delay(frequency);
        }
      
      break;

      case 2:  // pattern 3
        Serial.println("Patt 3");          

        for (int i = 0; i < 7; i++) {
          digitalWrite(ledPins[i], HIGH);
          digitalWrite(ledPins[i+1], HIGH);
          delay(frequency);
          digitalWrite(ledPins[i], LOW);
          digitalWrite(ledPins[i+1], LOW);

          delay(frequency);
        }
      
      break;

      case 3:  // pattern 4
        Serial.println("Patt 4");          

        for (int i = 6; i >= 0; i--) {
          digitalWrite(ledPins[i], HIGH);
          digitalWrite(ledPins[i-2], HIGH);
          delay(frequency);
          digitalWrite(ledPins[i], LOW);
          digitalWrite(ledPins[i-2], LOW);

          delay(frequency);
        }
      
      break;

      case 4:  // pattern 5
        Serial.println("Patt 5");          

        pot = analogRead(A0);
        num = map(pot, 0, 1023, 0, 255);

        for(int i=3; i<10; i++){
          analogWrite(i, num); 
        }
            
      break;
  }
 }
}

void longPress(){
  pot = analogRead(A0);
  num = map(pot, 0, 1023, 0, 7);

  switch(num){
    case 0: //all OFF
    for (int i = 0; i < 6; i++) {
      digitalWrite(ledPins[i], LOW);
    }
    break;

    case 1: //led 1
    digitalWrite(ledPins[0], HIGH);
    off();
        break;

    case 2: //led <2
    for (int i = 0; i < 2; i++) {
      digitalWrite(ledPins[i], HIGH);
    }
    off();
    break;

    case 3: //led <3
    for (int i = 0; i < 3; i++) {
      digitalWrite(ledPins[i], HIGH);
    }
    off();
    break;

    case 4: //led <4
    for (int i = 0; i < 4; i++) {
      digitalWrite(ledPins[i], HIGH);
    }
    off();
    break;

    case 5: //led <5
    for (int i = 0; i < 5; i++) {
      digitalWrite(ledPins[i], HIGH);
    }
    off();
    break;

    case 6: //led <6
    for (int i = 0; i < 6; i++) {
      digitalWrite(ledPins[i], HIGH);
    }
    off();
    break;

    case 7: //all ON
    for (int i = 0; i < 7; i++) {
      digitalWrite(ledPins[i], HIGH);
    }
    off();
    break;
  }
}

void off(){//TURN OFF LEDs BETWEEN CASES
    digitalWrite(ledPins[0], LOW);
    digitalWrite(ledPins[1], LOW);
    digitalWrite(ledPins[2], LOW);
    digitalWrite(ledPins[3], LOW);
    digitalWrite(ledPins[4], LOW);
    digitalWrite(ledPins[5], LOW);
    digitalWrite(ledPins[6], LOW);
}