use std::error::Error;

use async_std::io::stdin;
use futures::future::BoxFuture;

use super::Selector;

#[derive(Debug, Copy, Clone)]
pub struct ConsoleSelector;

impl Selector for ConsoleSelector {
    type Error = Box<dyn Error>;
    type Response = BoxFuture<'static, Result<bool, Self::Error>>;

    fn review(&self, message: String) -> Self::Response {
        println!("{} (y/N) ", message);
        let stdin = stdin();
        Box::pin(async move {
            let mut buffer = String::new();
            stdin.read_line(&mut buffer).await?;
            Ok(
                match buffer.chars().next().unwrap_or('n').to_ascii_lowercase() {
                    'y' => true,
                    _ => false,
                },
            )
        })
    }
}