#include <Adafruit_NeoPixel.h>

const byte pir_pin = 2;
const byte data_pin = 15;
const byte led_num = 16;

Adafruit_NeoPixel pixels = Adafruit_NeoPixel(led_num, data_pin, NEO_GRB + NEO_KHZ800);

void setup() {
  // put your setup code here, to run once:
  Serial.begin(115200);
  Serial.println("Hello, ESP32!");
  pinMode(pir_pin, INPUT);
  pixels.begin();
  pixels.show();
}

void loop() {
  // put your main code here, to run repeatedly:
  delay(10); // this speeds up the simulation
  // digitalRead(pir_pin);
  int d_r = digitalRead(pir_pin);
  Serial.println(d_r);
  if (d_r){
    generate_random_pattern();
  }
  delay(10);
}

void generate_random_pattern(){
  byte pattern = random(1,3);

  // COLOR
  byte b = random(0,255);
  byte g = random(0,255);
  byte r = random(0,255);
  
  // PATTERNS
  if (pattern == 1){
    for (int i = 0; i < led_num; i++){
    pixels.setPixelColor(i,r,g,b);
    delay(50);
  }
  for (int i = led_num - 1; i >= 0; i--){
    pixels.setPixelColor(i,0,0,0);
    pixels.show();
    delay(50);
  }
  }
  else if(pattern == 2){
    for (int i = 0; i <= 255; i++){
      for (int j = 0; j < led_num; j++){
        pixels.setPixelColor(j, 0, i, i);
      }
      pixels.show();
      delay(10); 
    }
    for (int i = 255; i >= 0; i--){
      for (int j = 0; j < led_num; j++){
        pixels.setPixelColor(j, 0, i, i);
      } 
      pixels.show();
      delay(10); 
    } 
  } 
}