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use super::{Pin, PinType, State};
use std::cell::RefCell;
use std::rc::Rc;

#[derive(Default, Debug)]
pub struct Trace {
    link: Vec<Rc<RefCell<Pin>>>
}

impl Trace {
    pub fn new() -> Trace {
        Trace {
            link: vec![]
        }
    }

    pub fn connect(&mut self, pin: Rc<RefCell<Pin>>) {
        self.link.push(pin)
    }

    pub fn communicate(&mut self) {
        let mut main_state = State::Undefined;
        for pin in self.link.iter() {
            if pin.borrow().pin_type == PinType::Output {
                match pin.borrow().state {
                    State::High => main_state = State::High,
                    State::Low => if main_state == State::Undefined { main_state = State::Low },
                    State::Undefined => {}
                }
            }
        }
        for pin in self.link.iter_mut() {
            if pin.borrow().pin_type != PinType::Output {
                pin.borrow_mut().state = main_state.clone();
            }
        }
    }
}