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use futures::{Future, Poll};

use crate::errors::Error;

/// Represent a future that resolves into Telegram API response.
#[must_use = "futures do nothing unless polled"]
pub struct TelegramFuture<T> {
    inner: Box<Future<Item = T, Error = Error>>,
}

pub trait NewTelegramFuture<T> {
    fn new(inner: Box<Future<Item = T, Error = Error>>) -> Self;
}

impl<T> NewTelegramFuture<T> for TelegramFuture<T> {
    fn new(inner: Box<Future<Item = T, Error = Error>>) -> Self {
        Self { inner: inner }
    }
}

impl<T> Future for TelegramFuture<T> {
    type Item = T;
    type Error = Error;

    fn poll(&mut self) -> Poll<Self::Item, Self::Error> {
        self.inner.poll()
    }
}