use std::time::Duration;

/// A terminal spinner for a research phase, shown only when logging is off —
/// with logging on, the trace output already tells the user something is
/// happening, and interleaving both would just be noisy. Clearing on drop
/// means call sites don't need an explicit "stop" at every early return.
pub(crate) struct Spinner(Option<indicatif::ProgressBar>);

impl Spinner {
    pub(crate) fn start(enabled: bool, message: &'static str) -> Self {
        if !enabled {
            return Self(None);
        }

        let bar = indicatif::ProgressBar::new_spinner();
        bar.enable_steady_tick(Duration::from_millis(100));
        bar.set_style(
            indicatif::ProgressStyle::with_template("{spinner:.cyan} {msg}")
                .expect("static template is valid"),
        );
        bar.set_message(message);

        Self(Some(bar))
    }
}

impl Drop for Spinner {
    fn drop(&mut self) {
        if let Some(bar) = &self.0 {
            bar.finish_and_clear();
        }
    }
}