#include <FastLED.h>
#define NUM_LEDS 15
#define LED_PIN 25
#define LDR_PIN 2
#define PIR_DWN_PIN 4
#define PIR_UP_PIN 5

unsigned long previous_time = 0;
unsigned long current_time = 0;
unsigned long time_passed = 0;
unsigned int timeout = 15;

CRGB leds[NUM_LEDS];

void setup() {
  Serial.begin(115200);
  FastLED.addLeds<WS2812, LED_PIN, GRB>(leds, NUM_LEDS);
}

void loop() {
  int light_val = analogRead(LDR_PIN);
  //Serial.println(light_val);

  if(light_val > 600){
    int pir_dwn = digitalRead(PIR_DWN_PIN);
    int pir_up = digitalRead(PIR_UP_PIN);

    if(pir_dwn == 1){
      previous_time = millis() / 1000;
      current_time = millis() / 1000;

      while(current_time - previous_time < timeout){
        for(int i = 0; i < NUM_LEDS; i++){
          leds[i] = CRGB(255, 255, 255);
          FastLED.show();
          delay(100);
        }
        current_time = millis() / 1000;

        Serial.print(current_time);
        Serial.print(" - ");
        Serial.print(previous_time);
        Serial.print(" => ");
        Serial.print(current_time - previous_time);
        Serial.print(" < ");
        Serial.print(timeout);
        if(current_time - previous_time < timeout){
          Serial.print(" | ");
          Serial.println("YES");
        }
        else{
          Serial.print(" | ");
          Serial.println("NO");
        }
      }

      for(int i = 0; i < NUM_LEDS; i++){
        leds[i] = CRGB(0, 0, 0);
        FastLED.show();
        delay(100);
      }
    }

    if(pir_up == 1){
      previous_time = millis() / 1000;
      current_time = millis() / 1000;

      while(current_time - previous_time < timeout){
        for(int i = NUM_LEDS - 1; i >= 0; i--){
          leds[i] = CRGB(255, 255, 255);
          FastLED.show();
          delay(100);
        }
        current_time = millis() / 1000;

        Serial.print(current_time);
        Serial.print(" - ");
        Serial.print(previous_time);
        Serial.print(" => ");
        Serial.print(current_time - previous_time);
        Serial.print(" < ");
        Serial.print(timeout);
        if(current_time - previous_time < timeout){
          Serial.print(" | ");
          Serial.println("YES");
        }
        else{
          Serial.print(" | ");
          Serial.println("NO");
        }
      }

      for(int i = NUM_LEDS - 1; i >= 0; i--){
        leds[i] = CRGB(0, 0, 0);
        FastLED.show();
        delay(100);
      }
    }
  }
}