#include <avr/sleep.h>

#ifndef cbi
#define cbi(sfr, bit) (_SFR_BYTE(sfr) &= ~_BV(bit))
#endif
#ifndef sbi
#define sbi(sfr, bit) (_SFR_BYTE(sfr) |= _BV(bit))
#endif

//**here you set brightness of modes
int mode1 = 255;
int mode2 = 8; 

const int buttonPin = 1; //setting button pin
const int ledPin =  0;  // setting LED pin
int buttonPushCounter1 = 1;    // counts the button pushes
int buttonState1 = 1;    // tracks the button state
int lastButtonState1 = 0;    // last state of the button  
int buttonState = 0;  // Button status
int lastButtonState = LOW;  //Button set to LOW

long lastDebounceTime = 0;  // Debounce status
long debounceDelay = 50;  // Debounce timer

void setup() {
  pinMode(ledPin, OUTPUT);  // Sets LED as output
  pinMode(buttonPin, INPUT);  // Sets button as input

  sbi(GIMSK,PCIE); // Turn on Pin Change interrupt
  sbi(PCMSK,PCINT1); // Which pins are affected by the interrupt
}

//mode one: LED is set to 100% brightness by default 
int modeone() {
  analogWrite(ledPin,mode1);
}

//mode two: LED is set to your preference of brightness (my default is about 30% = 76)
int modetwo() {
  analogWrite(ledPin,mode2);
}

//mode three: strobe light, I set it to be the most disorienting in darkness but feel free to change on and off times (in [ms])
int modethree() {
  digitalWrite(ledPin,HIGH);
  delay(15);
  digitalWrite(ledPin,LOW);
  delay(100);
}

//Sleep mode
int modefour() {
  analogWrite(ledPin,8);
  delay(20);
  analogWrite(ledPin,0);
  delay(20);
  analogWrite(ledPin,8);
  delay(20);
  analogWrite(ledPin,0);
  delay(20);
  analogWrite(ledPin,8);
  delay(20);
  analogWrite(ledPin,0);
  buttonPushCounter1 = 1;
  system_sleep();
  
}





  
void loop() {
  // All the debound button press stuff
  int reading = digitalRead(buttonPin);
  buttonState1 = digitalRead(buttonPin);
  
  if (reading != lastButtonState) {
    lastDebounceTime = millis();
  } 
  
  if ((millis() - lastDebounceTime) > debounceDelay) {

    if (reading != buttonState) {
      buttonState = reading;
      
        if (buttonState1 != lastButtonState1) {
          
          if (buttonState1 == HIGH) {
            buttonPushCounter1++;
            
            if (buttonPushCounter1 == 5) {
              buttonPushCounter1 = 1;}
          }
          else {
          }
        }
          lastButtonState1 = buttonState1;
    }
  }
  lastButtonState = reading;

//switching modes:
  
  if (buttonPushCounter1 == 1) {  
      modeone();
}
  if (buttonPushCounter1 == 2) {  
       modetwo(); 
}
  if (buttonPushCounter1 == 3) {  
      modethree();
}
  if (buttonPushCounter1 == 4) {  
      modefour();
}







}
//loop end


void system_sleep() {
  cbi(ADCSRA,ADEN); // Switch Analog to Digital converter OFF
  set_sleep_mode(SLEEP_MODE_PWR_DOWN); // Set sleep mode
  sleep_mode(); // System sleeps here
  sbi(ADCSRA,ADEN);  // Switch Analog to Digital converter ON
}

ISR(PCINT0_vect) {
}