#include <avr/io.h>
#include <avr/sleep.h>
#include <avr/interrupt.h>
#include <util/delay.h>

// 79 cykli po 8 sekund = ok. 10.48 minuty
#define CYKLE_WDT 79 

volatile uint8_t licznik_wdt = 0;

void setup_watchdog(void) {
    cli();
    #if defined(__AVR_ATtiny13__) || defined(__AVR_ATtiny13A__)
        WDTCR |= (1 << WDCE) | (1 << WDE);
        WDTCR = (1 << WDTIE) | (0 << WDE) | (1 << WDP3) | (0 << WDP2) | (0 << WDP1) | (1 << WDP0);
    #else
        WDTCR |= (1 << WDCE) | (1 << WDE);
        WDTCR = (1 << WDIE) | (0 << WDE) | (1 << WDP3) | (0 << WDP2) | (0 << WDP1) | (1 << WDP0);
    #endif
    sei();
}

int main(void) {
    DDRB |= (1 << PB0); 
    PORTB &= ~(1 << PB0);
    PORTB |= (1 << PB1) | (1 << PB2) | (1 << PB3) | (1 << PB4) | (1 << PB5);

    ADCSRA &= ~(1 << ADEN); 
    ACSR |= (1 << ACD);     
    
    #if defined(__AVR_ATtiny13__) || defined(__AVR_ATtiny13A__)
        PRR |= (1 << PRTIM0) | (1 << PRADC);
    #else
        PRR |= (1 << PRTIM0) | (1 << PRTIM1) | (1 << PRADC);
    #endif

    setup_watchdog();

    while (1) {
        if (licznik_wdt >= CYKLE_WDT) {
            licznik_wdt = 0; 

            // --- AKCJA: Włączenie lampki disco i silniczka na 2 sekundy ---
            PORTB |= (1 << PB0);  
            _delay_ms(2000);      
            PORTB &= ~(1 << PB0); 
        }

        // --- GŁĘBOKI SEN ---
        set_sleep_mode(SLEEP_MODE_PWR_DOWN);
        sleep_enable();

        #if defined(BODS) && defined(BODSE)
            MCUCR |= (1 << BODS) | (1 << BODSE);
            MCUCR = (MCUCR & ~(1 << BODSE)) | (1 << BODS);
        #endif

        sleep_cpu(); 
        sleep_disable(); 
    }
}

ISR(WDT_vect) {
    licznik_wdt++; 
    #if defined(__AVR_ATtiny13__) || defined(__AVR_ATtiny13A__)
        WDTCR |= (1 << WDTIE);
    #else
        WDTCR |= (1 << WDIE);
    #endif
}