use std::io::Write;

use log::trace;

pub fn is_noninteractive() -> bool {
    if let Ok(v) = std::env::var("PKGR_NON_INTERACTIVE") {
        trace!("PKGR_NON_INTERACTIVE={}", v);
        match v.as_str() {
            "1" => true,
            "true" => true,
            _ => false
        }
    } else { false }
}

pub fn prompt_bool<S: Into<String>>(prompt: S, default: bool) -> bool {
    if is_noninteractive() { return default; }
    print!("{} [{}]: ", prompt.into(), if default { "Y/n" } else { "y/N" });
    match std::io::stdout().flush() {
        Ok(_) => (),
        _ => println!()
    };

    let mut input = String::new();
    std::io::stdin().read_line(&mut input).expect("Failed to read input.");
    let answer = input.trim().to_lowercase();

    if answer.is_empty() {
        default
    } else {
        answer == "y" || answer == "yes"
    }
}