#include <avr/sleep.h>
#include <avr/interrupt.h>

const int redPin = 0;   // PB0
const int greenPin = 1; // PB1
const int bluePin = 4;  // PB4
const int tiltPin = 2;  // PB2 (Interrupt 0)

void wakeUp() {}

void setup() {
  pinMode(redPin, OUTPUT);
  pinMode(greenPin, OUTPUT);
  pinMode(bluePin, OUTPUT);
  pinMode(tiltPin, INPUT_PULLUP);
}

void setColor(int r, int g, int b) {
  analogWrite(redPin, r);
  analogWrite(greenPin, g);
  // PB4 doesn't support analogWrite easily on all cores, 
  // so we'll use digitalWrite for a simple Blue on/off
  digitalWrite(bluePin, b > 127 ? HIGH : LOW);
}

void loop() {
  // --- 1. THE ACTION: Cycle through colors ---
  for (int i = 0; i < 3; i++) {
    // Pulse Red-ish
    setColor(255, 0, 0); delay(200);
    // Pulse Green-ish
    setColor(0, 255, 0); delay(200);
    // Pulse Blue-ish/Cyan
    setColor(0, 255, 255); delay(200);
    // Pulse White (All on)
    setColor(255, 255, 255); delay(200);
  }
  
  setColor(0, 0, 0); // Turn off

  // --- 2. THE SLEEP ---
  ADCSRA &= ~(1 << ADEN);
  set_sleep_mode(SLEEP_MODE_PWR_DOWN);
  sleep_enable();
  attachInterrupt(0, wakeUp, LOW);
  sleep_cpu(); 

  // --- 3. WAKEUP ---
  sleep_disable();
  detachInterrupt(0);
  delay(500); 
}