duodiff 0.1.0

A fast, cross-platform terminal user interface (TUI) directory comparison tool
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use crate::diff::AlignedNode;
use crossterm::event::{self, Event as CrosstermEvent};
use std::time::Duration;
use tokio::sync::mpsc;

#[derive(Debug)]
pub enum AppEvent {
    Terminal(CrosstermEvent),
    ScanFinished(AlignedNode),
    ScanProgress {
        scanned_count: usize,
        current_path: String,
    },
    Error(String),
    Tick,
}

pub struct EventHandler {
    pub rx: mpsc::Receiver<AppEvent>,
}

impl EventHandler {
    pub fn new(tick_rate: Duration) -> (Self, mpsc::Sender<AppEvent>) {
        let (tx, rx) = mpsc::channel(100);
        let terminal_tx = tx.clone();

        // Spawn inputs listener
        tokio::spawn(async move {
            loop {
                if event::poll(Duration::from_millis(50)).unwrap_or(false) {
                    if let Ok(evt) = event::read() {
                        let _ = terminal_tx.send(AppEvent::Terminal(evt)).await;
                    }
                }
                tokio::time::sleep(Duration::from_millis(5)).await;
            }
        });

        let tick_tx = tx.clone();
        // Spawn ticker
        tokio::spawn(async move {
            loop {
                let _ = tick_tx.send(AppEvent::Tick).await;
                tokio::time::sleep(tick_rate).await;
            }
        });

        (Self { rx }, tx)
    }

    pub async fn next(&mut self) -> Option<AppEvent> {
        self.rx.recv().await
    }
}

#[cfg(test)]
mod tests {
    use super::*;

    #[tokio::test]
    async fn test_tick_event() {
        let (mut handler, _tx) = EventHandler::new(Duration::from_millis(10));
        // We expect to receive a Tick event within a short time.
        // But since we didn't spawn the tick task, this will fail or return None (or hang, so we use timeout).
        let event = tokio::time::timeout(Duration::from_millis(50), handler.next()).await;

        let opt = event.expect("Timeout waiting for event");
        let evt = opt.expect("Expected Some(AppEvent::Tick), got None");
        assert!(matches!(evt, AppEvent::Tick), "Expected AppEvent::Tick");
    }
}