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use std::ops::{Deref, DerefMut};

use super::alive::AliveFlag;

#[cfg(feature = "serde-sync")]
use serde::{Deserialize, Serialize};

#[derive(Debug)]
#[cfg_attr(feature = "serde-sync", derive(Serialize, Deserialize))]
pub struct Weak<T> {
    alive: AliveFlag,
    inner: T,
}

impl<T> Weak<T> {
    #[inline]
    pub fn new(alive: bool, inner: T) -> Self {
        Self {
            alive: AliveFlag::new(alive),
            inner,
        }
    }

    #[inline]
    pub fn is_usable(&self) -> bool {
        self.alive.is_running()
    }

    #[inline]
    pub fn wrap(&self) -> Option<&T> {
        match self.is_usable() {
            true => Some(&self.inner),
            false => None,
        }
    }
}

impl<T> Deref for Weak<T> {
    type Target = T;

    #[inline]
    fn deref(&self) -> &Self::Target {
        &self.inner
    }
}

impl<T> DerefMut for Weak<T> {
    #[inline]
    fn deref_mut(&mut self) -> &mut Self::Target {
        &mut self.inner
    }
}