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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::*;
use crate::Property;

pub struct DedupOr<'a, T>{
    last_value: Option<T>,
    sender: Sender<'a,T>,
    or: Property<'a, bool>,
}

impl<'a,T> DedupOr<'a,T>{
    pub fn new(or: Property<'a, bool>) -> DedupOr<'a,T>{
        DedupOr{
            or,
            last_value: None,
            sender: Sender::new(),
        }
    }
}

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

impl<'a, T: PartialEq + Clone> SinkInner<'a, T> for DedupOr<'a,T>{
    #[inline]
    fn call(&mut self, t: T) -> Result<(),()>{
        if let Some(prev) = self.last_value.as_ref(){
            if *prev == t {
                return Ok(())
            }
        }

        self.last_value = Some(t.clone());

        if !*self.or.as_ref() {
            return Ok(())
        }

        self.sender.send(t);
        Ok(())
    }

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