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use std::cell::UnsafeCell;
use std::rc::Rc;
use std::os::raw::c_void;
use std::marker::PhantomData;

use crate::Sender;
use crate::priv_traits::*;

pub struct OnValue<'a,  T, F: FnMut(T)>{
    func: F,
    sender: Sender<'a,T>,
    _marker: PhantomData<T>,
}

impl<'a, T, F: FnMut(T)> OnValue<'a,T,F>{
    pub fn new(f: F) -> OnValue<'a,T,F>{
        OnValue{
            func: f,
            sender: Sender::new(),
            _marker: PhantomData,
        }
    }
}

impl<'a,T, F: FnMut(T)> StreamInner<'a,T> for OnValue<'a,T,F>{
    #[inline]
    fn push(&mut self, st: Rc<UnsafeCell<dyn SinkInner<'a,T>+'a>>){
        self.sender.push(st)
    }

    #[inline]
    fn send(&mut self, t: T){
        self.sender.send(t)
    }
}

impl<'a, T, F: FnMut(T)> Remove for OnValue<'a, T, F>{
    fn remove_raw(&mut self, st: *const c_void){
        self.sender.remove_raw(st)
    }
}

impl<'a,T: Clone, F: FnMut(T)> SinkInner<'a,T> for OnValue<'a,T,F>{
    #[inline]
    fn call(&mut self, t: T) -> Result<(),()>{
        (self.func)(t.clone());
        self.sender.send(t);
        Ok(())
    }

    #[inline]
    fn is_alive(&self) -> bool {
        true
    }
}