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

use crate::{Sender, Stream, stream};
use crate::priv_traits::*;

pub struct Partition<'a, T, F>{
    func: F,
    sender: Sender<'a,T>,
    sender_false: Sender<'a, T>,
    _marker: PhantomData<T>,
}

impl<'a, T: 'a, F> Partition<'a,T,F>{
    pub fn new(f: F) -> (Partition<'a,T,F>, Stream<'a,T>){
        let (sender_false, stream_false) = stream();
        let filter = Partition{
            func: f,
            sender: Sender::new(),
            sender_false,
            _marker: PhantomData,
        };
        (filter, stream_false)
    }
}

impl<'a,T, F> StreamInner<'a,T> for Partition<'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> Remove for Partition<'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 Partition<'a,T,F>{
    #[inline]
    fn call(&mut self, t: T) -> Result<(),()>{
        if (self.func)(&t){
            self.sender.send(t);
        }else{
            self.sender_false.send(t)
        }
        Ok(())
    }

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