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use futures::{Async, Poll};

use actor::Actor;
use fut::ActorFuture;


/// Future for the `map_err` combinator, changing the error type of a future.
///
/// This is created by the `Future::map_err` method.
#[derive(Debug)]
#[must_use = "futures do nothing unless polled"]
pub struct MapErr<A, F> where A: ActorFuture {
    future: A,
    f: Option<F>,
}

pub fn new<A, F>(future: A, f: F) -> MapErr<A, F> where A: ActorFuture
{
    MapErr {
        future: future,
        f: Some(f),
    }
}

impl<U, A, F> ActorFuture for MapErr<A, F>
    where A: ActorFuture,
          F: FnOnce(A::Error, &mut A::Actor, &mut <A::Actor as Actor>::Context) -> U,
{
    type Item = A::Item;
    type Error = U;
    type Actor = A::Actor;

    fn poll(&mut self,
            act: &mut A::Actor,
            ctx: &mut <A::Actor as Actor>::Context) -> Poll<A::Item, U>
    {
        let e = match self.future.poll(act, ctx) {
            Ok(Async::NotReady) => return Ok(Async::NotReady),
            other => other,
        };
        match e {
            Err(e) =>
                Err(self.f.take().expect("cannot poll MapErr twice")(e, act, ctx)),
            Ok(err) => Ok(err)
        }
    }
}

pub struct DropErr<A> where A: ActorFuture {
    future: A
}

impl<A>DropErr<A> where A: ActorFuture {
    pub(crate) fn new(future: A) -> DropErr<A>
    {
        DropErr {
            future: future,
        }
    }
}

impl<A> ActorFuture for DropErr<A>
    where A: ActorFuture
{
    type Item = A::Item;
    type Error = ();
    type Actor = A::Actor;

    fn poll(&mut self,
            act: &mut A::Actor,
            ctx: &mut <A::Actor as Actor>::Context) -> Poll<A::Item, ()>
    {
        match self.future.poll(act, ctx) {
            Ok(Async::Ready(item)) => Ok(Async::Ready(item)),
            Ok(Async::NotReady) => Ok(Async::NotReady),
            Err(_) => Err(()),
        }
    }
}