#include <SoftwareSerial.h>
#include <DFRobotDFPlayerMini.h>

const int pir1 = 9;
const int pir2 = 4;
const int ir1 = 10;
const int ir2 = 8;

int pirStatus1 = 0;
int pirStatus2 = 0;
int irStatus1 = 0; //incoming
int irStatus2 = 0; //stop

SoftwareSerial playerSerial(3, 2);
DFRobotDFPlayerMini player;

int currentAudio = 0;                 
unsigned long audioStart = 0;        
unsigned long audioDuration = 0;     

void setup() 
{
  pinMode(pir1, INPUT);
  pinMode(pir2, INPUT);
  pinMode(ir1, INPUT);
  pinMode(ir2, INPUT);
  Serial.begin(9600);
  playerSerial.begin(9600);
  player.begin(playerSerial);
  player.volume(15);
}

void loop() 
{
  pirStatus1 = digitalRead(pir1);
  pirStatus2 = digitalRead(pir2);
  irStatus1 = digitalRead(ir1);
  irStatus2 = digitalRead(ir2);

  Serial.print("ir1: ");
  Serial.print(irStatus1);
  Serial.print(" ir2: ");
  Serial.print(irStatus2);
  Serial.print(" pir1: ");
  Serial.print(pirStatus1);
  Serial.print(" pir2: ");
  Serial.println(pirStatus2);

// PIR1 
if (pirStatus1 == 1 && pirStatus2 == 0) //high, low
  {
    if (irStatus1==1 && irStatus2==1) //both not detecting
    {
      if (currentAudio != 1) 
      {
        player.stop();
        player.play(1);
        Serial.println("audio 1");
        currentAudio = 1;
        audioStart = millis();
        audioDuration = 15500;
      }
    }
    else if (irStatus1==0 && irStatus2==1) //ir1 detecting
    {
      if (currentAudio != 2) 
      {
        player.stop();
        player.play(2); 
        Serial.println("audio 2");
        currentAudio = 2;
        audioStart = millis();
        audioDuration = 18500;
      }
    }

    else if (irStatus1 == 0 && irStatus2==0) //both detecting
    {
      if (currentAudio != 0) 
      {
        player.stop();
        Serial.println("stopped");
        currentAudio = 0;
      }
    }
    else if (irStatus1 == 1 && irStatus2 == 0) //ir2 detecting
    {
      if (currentAudio != 0)
      {
        player.stop();
        Serial.println("stopped");
        currentAudio = 0;
      }
    }
  }

//PIR2 high
else if (pirStatus1 == 0 && pirStatus2 == 1) 
{
  if (irStatus1 == 0 && irStatus2 == 0) //both detecting
  {
    if (currentAudio != 0) 
    {
      player.stop();
      Serial.println("stopped");
      currentAudio = 0;
    }
  }
  else if (irStatus1 == 1 && irStatus2 == 0) //ir2 detecting
  {
    if (currentAudio != 0) 
    {
      player.stop();
      Serial.println("stopped");
      currentAudio = 0;
    }
  }
  else if (irStatus1 == 0 && irStatus2 == 1) //ir1 detecting 
  {
    if (currentAudio != 3) 
    {
      player.stop();
      player.play(3);
      Serial.println("audio 3 playing");
      currentAudio = 3;
      audioStart = millis();
      audioDuration = 11500;
    }
  }
  else if (irStatus1 == 1 && irStatus2 == 1) //both ir not detecting
  {
    if (currentAudio != 3) 
    {
      player.stop();
      player.play(3);
      Serial.println("audio 3 playing");
      currentAudio = 3;
      audioStart = millis();
      audioDuration = 11500;
    }
  }
}

  // both PIR high
  else if (pirStatus1 == 1 && pirStatus2 == 1) 
  {
    if ((irStatus1==1 && irStatus2 == 0) || (irStatus1 == 0 && irStatus2 == 0)) //ir2 detecting or all ir detecting
    {
      if (currentAudio != 0) 
      {
        player.stop();
        Serial.println("stopped");
        currentAudio = 0;
      }
    } 
    else if (irStatus1==0 && irStatus2==1) //ir1 detecting
    {
      if (currentAudio != 3) 
      {
        player.stop();
        player.play(3);
        Serial.println("audio 3 playing");
        currentAudio = 3;
        audioStart = millis();
        audioDuration = 11500;
      }
    }
    else if (irStatus1==1 && irStatus2==1) //none detecting
    {
      if (currentAudio != 3) 
      {
        player.stop();
        player.play(3);
        Serial.println("audio 3 playing");
        currentAudio = 3;
        audioStart = millis();
        audioDuration = 11500;
      }
    }
  }

 //if both low, do nothing

  if (currentAudio != 0 && millis() - audioStart > audioDuration) 
  {
    Serial.println("audio finished");
    currentAudio = 0;
  }
}