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

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

pub struct Skip<'a, T>{
    skip: usize,
    skipped: usize,
    sender: Sender<'a,T>,
}

impl<'a, T> Skip<'a,T>{
    pub fn new(skip: usize) -> Skip<'a,T>{
        Skip{
            skip: skip,
            skipped: 0,
            sender: Sender::new(),
        }
    }
}

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

impl<'a,T> SinkInner<'a,T> for Skip<'a, T>{
    #[inline]
    fn call(&mut self, t: T) -> Result<(),()>{
        if self.skipped < self.skip {
            self.skipped += 1;
            Ok(())
        }else{
            self.sender.send(t);
            Ok(())
        }
    }

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