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

use crate::priv_traits::*;
use crate::{Stream, StreamRc};

pub fn stream<'a, T: 'a>() -> (Sender<'a, T>, Stream<'a,T>){
    let se = Sender::new();
    let st = Stream::new(se.inner.clone());

    (se, st)
}


pub struct SenderInner<'a, T>{
    sink:  Option<Rc<UnsafeCell<dyn SinkInner<'a,T> + 'a>>>,
}

impl<'a, T> SenderInner<'a, T>{
    pub fn new() -> SenderInner<'a,T>{
        SenderInner{ sink: None }
    }
}

impl<'a, T> SenderInner<'a, T>{
    #[inline]
    pub fn send(&mut self, t: T){
        let done = if let Some(ref sink) = self.sink{
            unsafe{ (*sink.get()).call(t).is_err() }
        }else{
            false
        };
        if done { self.sink = None }
    }

    #[inline]
    pub fn send_all<I: IntoIterator<Item=T>>(&mut self, it: I){
        let done = if let Some(ref sink) = self.sink{
            it.into_iter().any(|t|unsafe{ (*sink.get()).call(t).is_err() })
        }else{
            false
        };
        if done { self.sink = None }
    }
}

impl<'a, T> StreamInner<'a,T> for SenderInner<'a, T>{
    #[inline]
    fn push(&mut self, st: Rc<UnsafeCell<dyn SinkInner<'a,T> + 'a>>){
        self.sink = Some(st);
    }

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

impl<'a, T> Remove for SenderInner<'a, T>{
    fn remove_raw(&mut self, st: *const c_void){
        let done = if let Some(ref sink) = self.sink{
            if sink.get() as *const c_void == st{
                true
            }else{
                panic!("Trying to remove a sink with a different address");
            }
        }else{
            false
        };
        if done { self.sink = None }
    }
}

impl<'a, T> SinkInner<'a,T> for SenderInner<'a, T>{
    #[inline]
    fn call(&mut self, t: T) -> Result<(),()>{
        self.send(t);
        Ok(())
    }

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

/// Events Sender
///
/// Sending part of a Sender/Stream pair. Keeps track
/// of the children streams and notifies them of any new
/// event if they are still alive.
#[derive(Clone)]
pub struct Sender<'a, T>{
    inner: Rc<UnsafeCell<SenderInner<'a, T>>>,
}

impl<'a, T> Sender<'a, T>{
    pub fn new() -> Sender<'a,T>{
        Sender{ inner: Rc::new(UnsafeCell::new(SenderInner::new())) }
    }

    // pub fn from_sink(sink: Rc<UnsafeCell<SinkInner<'a,T> + 'a>>) -> Sender<'a,T>{
    //     Sender{ inner: Rc::new(UnsafeCell::new(SenderInner::from_sink(sink))) }
    // }

    pub fn push(&mut self, st: Rc<UnsafeCell<dyn SinkInner<'a,T> + 'a>>){
        unsafe{ (*self.inner.get()).push(st) }
    }

    pub fn remove_raw(&mut self, st: *const c_void){
        unsafe{ (*self.inner.get()).remove_raw(st) }
    }

    pub fn num_receivers(&self) -> usize{
        if unsafe{ (*self.inner.get()).sink.is_some() } {
            1
        }else{
            0
        }
    }
}

impl<'a, T> Sender<'a, T>{
    #[inline]
    pub fn send(&self, t: T){
        unsafe{(*self.inner.get()).send(t)}
    }

    #[inline]
    pub fn send_all<I: IntoIterator<Item = T>>(&self, it: I){

        unsafe{(*self.inner.get()).send_all(it)}
    }
}

impl<'a, T: 'a> From<StreamRc<'a,T>> for Stream<'a,T>{
    fn from(st: StreamRc<'a,T>) -> Stream<'a,T>{
        Stream::from_parent(st, Rc::new(UnsafeCell::new(SenderInner::new())))
    }
}