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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 TakeWhile<'a, T, F: FnMut(&T) -> bool>{
    f: F,
    sender: Sender<'a,T>,
    then: Option<T>,
    is_alive: bool,
}

impl<'a, T, F: FnMut(&T) -> bool> TakeWhile<'a,T,F>{
    pub fn new(f: F) -> TakeWhile<'a,T,F>{
        TakeWhile{
            f: f,
            sender: Sender::new(),
            then: None,
            is_alive: true,
        }
    }

    pub fn new_with_then(f: F, then: T) -> TakeWhile<'a,T,F>{
        TakeWhile{
            f: f,
            sender: Sender::new(),
            then: Some(then),
            is_alive: true,
        }
    }
}

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

impl<'a, T, F: FnMut(&T) -> bool> SinkInner<'a,T> for TakeWhile<'a,T,F>{
    #[inline]
    fn call(&mut self, t: T) -> Result<(),()>{
        if (self.f)(&t) {
            self.sender.send(t);
            Ok(())
        }else{
            match self.then.take(){
                Some(then) => self.sender.send(then),
                None => ()
            }
            self.is_alive = false;
            Err(())
        }
    }

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