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

use crate::{Sender};
use crate::priv_traits::*;

pub struct Filter<'a, T, F: 'a>{
    func: F,
    sender: Sender<'a,T>,
}

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

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

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

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