#include <Arduino.h>

const int pirPin = 4;     // PIR sensor pin
const int ledPin = 10;    // LED pin
const int switchPin = 12; // External switch pin

int fadeUpSpeed = 25;     // Adjust fade up speed
int fadeDownSpeed = 20;   // Adjust fade down speed
int maxBrightness = 255;  // Maximum brightness
unsigned long fadeDelay = 2000; // Delay before fading down (60 seconds)

unsigned long lastMotionTime = 0;
int currentBrightness = 0;
boolean lightOn = false;
boolean buttonPressed = false;

void setup() {
  pinMode(pirPin, INPUT);
  pinMode(ledPin, OUTPUT);
  pinMode(switchPin, INPUT_PULLUP);
  analogWrite(ledPin, 0);
}

void loop() {
  boolean switchState = digitalRead(switchPin);
  int motionValue = digitalRead(pirPin);

  if (switchState == LOW && !buttonPressed) { // Button pressed
    buttonPressed = true;
    turnOnLED();
  } else if (switchState == HIGH && buttonPressed) { // Button released
    buttonPressed = false;
    turnOffLED();
    lastMotionTime = millis(); // Reset timer for PIR sensor
  }

  if (!buttonPressed) { // Control LED with PIR sensor when button is not pressed
    if (motionValue == HIGH) {
      if (!lightOn) {
        fadeUp();
        lightOn = true;
        lastMotionTime = millis();
      }
    } else if (lightOn && millis() - lastMotionTime >= fadeDelay) {
      fadeDown();
      lightOn = false;
    }
  }
}

void turnOnLED() {
  analogWrite(ledPin, maxBrightness);
  currentBrightness = maxBrightness;
  lightOn = true;
}

void turnOffLED() {
  analogWrite(ledPin, 0);
  currentBrightness = 0;
  lightOn = false;
}

void fadeUp() {
  for (int i = currentBrightness; i <= maxBrightness; i++) {
    analogWrite(ledPin, i);
    delay(fadeUpSpeed);
  }
  currentBrightness = maxBrightness;
}

void fadeDown() {
  for (int i = currentBrightness; i >= 0; i--) {
    analogWrite(ledPin, i);
    delay(fadeDownSpeed);
  }
  currentBrightness = 0;
}