#include <avr/io.h>
#include <avr/interrupt.h>
#include <TimeLib.h>
#include <math.h>
//mostmár ez is jónak tűnik
//TODO: set up seven segment decoder pins as outputs
//and bit combinations for them, and since no register is enought to host
//all of them u need to use 2 registers' pins 
const int debounceTime=20;
const int ledPin=5;
unsigned long int currentTime0=0;
unsigned long int currentTime1=0;
volatile unsigned long int triggerTime0=0;
volatile unsigned long int triggerTime1=0;
volatile int luminosity=0;
bool stateOfPD2=true;
bool stateOfPD3=true;

void setup(){
 //TODO: setting up an analog pin for the PWM for the LED
 DDRB|=(1<<PB5|1<<PB4|1<<PB3|1<<PB2|1<<PB1|1<<PB0);//outputs for segments A B C D E F
 DDRD|=(1<<PD7|1<<PD5);//output for G segment
 DDRD&=~(1<<PD2|1<<PD3);//configuring pin 2 and 3 as inputs
 PORTB=(1<<PB5|1<<PB4|1<<PB3|1<<PB2|1<<PB1|1<<PB0);//default will be 0
 PORTD&=~(1<<PD7|1<<PD5);//setting G segment to 0
 PORTD|=1<<PD2|1<<PD3;//pullup resistor for both pins
 EIMSK|=0b00000011;//configuring both INT0 and INT1 interrupts
 EICRA|=0b00000101;//configuring interrupt for any change so if we hold down the buttons for some time we can debounce the event when we let go of them aswell
 Serial.begin(9600);
 sei();
}

ISR(INT0_vect){
 //debouncing for falling edge event
 //checking with !(PIND&1<<PD2) if we had a falling edge->
 //this checks if PIND is 0 in the PD2 bit if yes we had falling edge
 currentTime0=millis();
 if(currentTime0-triggerTime0>debounceTime&&stateOfPD2&&luminosity>0){
  Serial.print("curr time0: ");
  Serial.print(currentTime0);
  Serial.print(" ");
  /*if(luminosity>0)*/luminosity--;
  Serial.println(luminosity);
 }
 //debouncing for rising edge event
 //if PIND has 1 in PD2 bit it was a rising edge trigger event
 //we need this so the buttons are debounced if we didnt let go of them in time
 //so when we let them go the bouncing doesnt trigger a falling edge event
 /*else if(currentTime-triggerTime0>debounceTime&&(PIND&1<<PD2))
 {triggerTime0=millis();}*/
 triggerTime0=millis();
}



//the else if is not needed if i update the trigger time in the end of the ISR
//outside of every if statement at just every interrupt event
//plus i check the current time before any statement cuz the millis func
//maybe fcking up the thing 
ISR(INT1_vect){
currentTime1=millis();

if(currentTime1-triggerTime1>debounceTime&&stateOfPD3&&luminosity<9){
  Serial.print("curr time1: ");
  Serial.print(currentTime1);
  Serial.print(" ");
  /*if(luminosity<9)*/luminosity++;
  Serial.println(luminosity);
  }
/*else if(millis()-triggerTime1>debounceTime&&(PIND&1<<PD3))
{triggerTime1=millis();}*/
triggerTime1=millis();
}


int main(){
  init();
  setup();
  while(true){
    stateOfPD2=(PIND&1<<PD2);
    stateOfPD3=(PIND&1<<PD3);
    updateLuminosity();
  }
}

void updateLuminosity(){
  switch (luminosity){
      case 0:
       PORTB=1<<PB5|1<<PB4|1<<PB3|1<<PB2|1<<PB1|1<<PB0;
       PORTD&=~(1<<PD7);
       break;
      case 1: 
       PORTB=1<<PB4|1<<PB3;
       PORTD&=~(1<<PD7);
       break;
      case 2: 
       PORTB=1<<PB5|1<<PB4|1<<PB2|1<<PB1;
       PORTD|=1<<PD7;
       break;
      case 3: 
       PORTB=1<<PB5|1<<PB4|1<<PB3|1<<PB2;
       PORTD|=1<<PD7;
       break;
      case 4: 
       PORTB=1<<PB4|1<<PB3|1<<PB0;
       PORTD|=1<<PD7;
       break;
      case 5: 
       PORTB=1<<PB5|1<<PB3|1<<PB2|1<<PB0;
       PORTD|=1<<PD7;
       break;
      case 6: 
       PORTB=1<<PB5|1<<PB3|1<<PB2|1<<PB1|1<<PB0;
       PORTD|=1<<PD7;
       break;
      case 7: 
       PORTB=1<<PB5|1<<PB4|1<<PB3;
       PORTD&=~(1<<PD7);
       break;
      case 8: 
       PORTB=1<<PB5|1<<PB4|1<<PB3|1<<PB2|1<<PB1|1<<PB0;
       PORTD|=1<<PD7;
       break;
      case 9: 
       PORTB=1<<PB5|1<<PB4|1<<PB3|1<<PB2|1<<PB0;
       PORTD|=1<<PD7;
       break;
    }
    analogWrite(ledPin,pow(1.851,luminosity)-0.5);//the task was to do 9 steps of 28 but this way brightness increases somewhat linearly
}