use serde::{Deserialize, Serialize};

#[derive(Clone, Copy, Serialize, Deserialize, Debug)]
pub struct DelayTimer {
    counter: u8,
}

impl Default for DelayTimer {
    fn default() -> Self {
        Self::new()
    }
}

impl DelayTimer {
    pub fn current(&self) -> u8 {
        self.counter
    }

    pub fn new() -> Self {
        DelayTimer { counter: 0xff }
    }

    pub fn reset(&mut self) {
        self.counter = 0xff;
    }

    pub fn set_timer(&mut self, new_value: u8) {
        self.counter = new_value
    }

    pub fn tick(&mut self) {
        if self.counter > 0 {
            self.counter -= 1;
        }
    }
}