/*
  HC-SR04 Ultrasonic Sensor Example.

  Turn the LED on when an object is within 100cm range.

  Copyright (C) 2021, Uri Shaked
*/
  int volume_up_button = 5;
  int volume_down_button = 6;

void setup() {
  Serial.begin(115200);
  pinMode(LED_BUILTIN, OUTPUT);

  pinMode(volume_up_button, OUTPUT);
  pinMode(volume_down_button, OUTPUT);
}

  int ECHO_PIN, TRIG_PIN;

float readDistanceCM() {
  ECHO_PIN = 2;
  TRIG_PIN = 3;

  pinMode(TRIG_PIN, OUTPUT);
  pinMode(ECHO_PIN, INPUT);

  digitalWrite(TRIG_PIN, LOW);
  delayMicroseconds(2);
  digitalWrite(TRIG_PIN, HIGH);
  delayMicroseconds(10);
  digitalWrite(TRIG_PIN, LOW);
  int duration = pulseIn(ECHO_PIN, HIGH);
  return duration * 0.034 / 2;
}

float distance;

void loop() {
  distance = readDistanceCM();

  bool isNearby = distance < 100;
  digitalWrite(LED_BUILTIN, isNearby);

  Serial.print("Measured distance: ");
  Serial.println(readDistanceCM());

  delay(100);

  //controlPlayback();
  //controlVolume();
  controlSong();
}

// Define states
const int PLAY = 1;
const int PAUSE = 2;
int state = PAUSE;

// Define thresholds
const float volumeThreshold = 10; // Distance threshold for volume control


// Function to control playback
void controlPlayback() {
int play_button = 4;
pinMode(play_button, OUTPUT);
  if (distance < volumeThreshold) {
    if (state == PAUSE) {

      Serial.println("Playing");
      state = PLAY;
      
      digitalWrite(play_button,HIGH);
      delay(2000);
    } else {

      Serial.println("Paused");
       state = PAUSE;
        digitalWrite(play_button,LOW);
       delay(2000);
    }
  }
}

int count =50;



int volume;
// Function to control volume with 2 settings 
void controlVolume() {

  if (distance >= volumeThreshold) {
    if (distance < 30) {
      volume = 1;  // 1st volume setting
      Serial.println("Volume DOWN: " + String(volume));
      count--;
      digitalWrite(volume_down_button, HIGH);
      Serial.println("Count"+String(count));
      delay(500);
      digitalWrite(volume_down_button, LOW);
      delay(500);
    } else if (distance > 30 && distance < 50) {
      volume = 2;  // 2nd volume setting
      Serial.println("Volume UP: " + String(volume));
      count++;
      digitalWrite(volume_up_button, HIGH);
      Serial.println("Count"+String(count));
      delay(2000);
      digitalWrite(volume_up_button, LOW);
      delay(2000);
  }
}
}

int lightValue1 = 8;               // choose the input pin (for PIR sensor)
int lightValue2 = 9; 
int pirState = LOW;             // we start, assuming no motion detected
bool leftTriggered, rightTriggered;

// Function to control next/previous song based on sequence
void controlSong() {
  pinMode(lightValue1, INPUT);
  pinMode(lightValue2, INPUT);


if (digitalRead(lightValue1) == HIGH && rightTriggered == true) {
    if(rightTriggered){
digitalWrite(volume_up_button, HIGH);
 delay(50);
 digitalWrite(volume_up_button, LOW);
      Serial.println("Next song");
      rightTriggered = false;
    }
  }

  else if (digitalRead(lightValue1) == HIGH) { 
    // Left sensor triggered
    leftTriggered = true;
  }

  if (digitalRead(lightValue2) == HIGH) {
  
    // Right sensor triggered
    if (leftTriggered) {
      // Left triggered first, then right, so go to previous song
      digitalWrite(volume_down_button, HIGH);
      delay(50);
      digitalWrite(volume_down_button, LOW);
      Serial.println("Previous song");
      leftTriggered = false; // Reset the flag
    } else {
      rightTriggered = true;
      // Right triggered first, so go to next song

    }

}
}